Speed and call quality testMy IP addressIP subnet calculatorDNS reportWhoIs lookupRemote support

Internet and network

Speed and call quality testTest delay, jitter and speed, with a focus on phone calls.My IP addressYour public IPv4 and IPv6 addresses, provider and address range.WhoIs lookupWho owns a domain or IP address, when it expires, and its DNS.DNS reportEvery DNS record for a domain, with email setup checked.IP subnet calculatorWork out a network's range, mask and hosts, and split it into subnets.

Computers and devices

Update checkIs this computer, phone and browser up to date? With links to update.Camera and mic testCheck your webcam and microphone before a call.Test print pagePrint an A4 page to check a printer: edges, text, line art and colours.

Make and print

Clean textStrip hidden characters, smart quotes and odd spaces from pasted text.QR code makerMake a QR code for a link, contact or message. Nothing leaves your browser.Wi-Fi QR posterPrint an A4 poster that lets guests join your Wi-Fi by scanning.

Surftec support

Remote supportLet a Surftec engineer connect to your computer to help you.All workingA full-screen confirmation that everything is up and running.

Surftec

Surftec websiteServices, news and how to contact Surftec
Cloud Tools
Guest
GuestNot signed in

Surftec customers will be recognised automatically when they use these tools from their office network.

Customer sign-in is coming soon.

IP subnet calculator

Type an address with its prefix or mask to see the network, its usable range and masks. Split it into smaller subnets, or look up any prefix in the reference tables.

Network86.60.0.0/14
Usable hosts262,142
Subnet mask255.252.0.0
Addresses262,144
Network address
86.60.0.0
Broadcast address
86.63.255.255
First usable
86.60.0.1
Last usable
86.63.255.254
Usable hosts
262,142 (262,144 less the network and broadcast addresses)
Subnet mask
255.252.0.0
Wildcard mask
0.3.255.255 (Cisco ACLs, OSPF)
Prefix length
/14
Type
Public public
Old class
A (default /8)
As numbers
Hex 563C0000 · Integer 1446772736 to 1447034879
Reverse DNS zones
60.86.in-addr.arpa
61.86.in-addr.arpa
62.86.in-addr.arpa
63.86.in-addr.arpa
/14 is not on a 8-bit boundary, so it takes 4 /16 zones.
Binary
Binary view
Binary (network bits bold, host bits grey)Dotted
Address01010110.00111100.00000000.0000000086.60.0.0
Subnet mask11111111.11111100.00000000.00000000255.252.0.0
Network01010110.00111100.00000000.0000000086.60.0.0
Broadcast01010110.00111111.11111111.1111111186.63.255.255
Split into smaller subnets/25
/15 (2)/16 (4)/17 (8)/18 (16)/19 (32)/20 (64)/21 (128)/22 (256)/23 (512)/24 (1,024)/25 (2,048)/26 (4,096)

86.60.0.0/14 makes 2,048 subnets of /25; the first 256 are listed.

Subnets
#SubnetUsable hosts rangeBroadcastHosts
186.60.0.0/2586.60.0.1 to 86.60.0.12686.60.0.127126
286.60.0.128/2586.60.0.129 to 86.60.0.25486.60.0.255126
386.60.1.0/2586.60.1.1 to 86.60.1.12686.60.1.127126
486.60.1.128/2586.60.1.129 to 86.60.1.25486.60.1.255126
586.60.2.0/2586.60.2.1 to 86.60.2.12686.60.2.127126
686.60.2.128/2586.60.2.129 to 86.60.2.25486.60.2.255126
786.60.3.0/2586.60.3.1 to 86.60.3.12686.60.3.127126
886.60.3.128/2586.60.3.129 to 86.60.3.25486.60.3.255126
986.60.4.0/2586.60.4.1 to 86.60.4.12686.60.4.127126
1086.60.4.128/2586.60.4.129 to 86.60.4.25486.60.4.255126
1186.60.5.0/2586.60.5.1 to 86.60.5.12686.60.5.127126
1286.60.5.128/2586.60.5.129 to 86.60.5.25486.60.5.255126
1386.60.6.0/2586.60.6.1 to 86.60.6.12686.60.6.127126
1486.60.6.128/2586.60.6.129 to 86.60.6.25486.60.6.255126
1586.60.7.0/2586.60.7.1 to 86.60.7.12686.60.7.127126
1686.60.7.128/2586.60.7.129 to 86.60.7.25486.60.7.255126
1786.60.8.0/2586.60.8.1 to 86.60.8.12686.60.8.127126
1886.60.8.128/2586.60.8.129 to 86.60.8.25486.60.8.255126
1986.60.9.0/2586.60.9.1 to 86.60.9.12686.60.9.127126
2086.60.9.128/2586.60.9.129 to 86.60.9.25486.60.9.255126
2186.60.10.0/2586.60.10.1 to 86.60.10.12686.60.10.127126
2286.60.10.128/2586.60.10.129 to 86.60.10.25486.60.10.255126
2386.60.11.0/2586.60.11.1 to 86.60.11.12686.60.11.127126
2486.60.11.128/2586.60.11.129 to 86.60.11.25486.60.11.255126
2586.60.12.0/2586.60.12.1 to 86.60.12.12686.60.12.127126
2686.60.12.128/2586.60.12.129 to 86.60.12.25486.60.12.255126
2786.60.13.0/2586.60.13.1 to 86.60.13.12686.60.13.127126
2886.60.13.128/2586.60.13.129 to 86.60.13.25486.60.13.255126
2986.60.14.0/2586.60.14.1 to 86.60.14.12686.60.14.127126
3086.60.14.128/2586.60.14.129 to 86.60.14.25486.60.14.255126
3186.60.15.0/2586.60.15.1 to 86.60.15.12686.60.15.127126
3286.60.15.128/2586.60.15.129 to 86.60.15.25486.60.15.255126
3386.60.16.0/2586.60.16.1 to 86.60.16.12686.60.16.127126
3486.60.16.128/2586.60.16.129 to 86.60.16.25486.60.16.255126
3586.60.17.0/2586.60.17.1 to 86.60.17.12686.60.17.127126
3686.60.17.128/2586.60.17.129 to 86.60.17.25486.60.17.255126
3786.60.18.0/2586.60.18.1 to 86.60.18.12686.60.18.127126
3886.60.18.128/2586.60.18.129 to 86.60.18.25486.60.18.255126
3986.60.19.0/2586.60.19.1 to 86.60.19.12686.60.19.127126
4086.60.19.128/2586.60.19.129 to 86.60.19.25486.60.19.255126
4186.60.20.0/2586.60.20.1 to 86.60.20.12686.60.20.127126
4286.60.20.128/2586.60.20.129 to 86.60.20.25486.60.20.255126
4386.60.21.0/2586.60.21.1 to 86.60.21.12686.60.21.127126
4486.60.21.128/2586.60.21.129 to 86.60.21.25486.60.21.255126
4586.60.22.0/2586.60.22.1 to 86.60.22.12686.60.22.127126
4686.60.22.128/2586.60.22.129 to 86.60.22.25486.60.22.255126
4786.60.23.0/2586.60.23.1 to 86.60.23.12686.60.23.127126
4886.60.23.128/2586.60.23.129 to 86.60.23.25486.60.23.255126
4986.60.24.0/2586.60.24.1 to 86.60.24.12686.60.24.127126
5086.60.24.128/2586.60.24.129 to 86.60.24.25486.60.24.255126
5186.60.25.0/2586.60.25.1 to 86.60.25.12686.60.25.127126
5286.60.25.128/2586.60.25.129 to 86.60.25.25486.60.25.255126
5386.60.26.0/2586.60.26.1 to 86.60.26.12686.60.26.127126
5486.60.26.128/2586.60.26.129 to 86.60.26.25486.60.26.255126
5586.60.27.0/2586.60.27.1 to 86.60.27.12686.60.27.127126
5686.60.27.128/2586.60.27.129 to 86.60.27.25486.60.27.255126
5786.60.28.0/2586.60.28.1 to 86.60.28.12686.60.28.127126
5886.60.28.128/2586.60.28.129 to 86.60.28.25486.60.28.255126
5986.60.29.0/2586.60.29.1 to 86.60.29.12686.60.29.127126
6086.60.29.128/2586.60.29.129 to 86.60.29.25486.60.29.255126
6186.60.30.0/2586.60.30.1 to 86.60.30.12686.60.30.127126
6286.60.30.128/2586.60.30.129 to 86.60.30.25486.60.30.255126
6386.60.31.0/2586.60.31.1 to 86.60.31.12686.60.31.127126
6486.60.31.128/2586.60.31.129 to 86.60.31.25486.60.31.255126
6586.60.32.0/2586.60.32.1 to 86.60.32.12686.60.32.127126
6686.60.32.128/2586.60.32.129 to 86.60.32.25486.60.32.255126
6786.60.33.0/2586.60.33.1 to 86.60.33.12686.60.33.127126
6886.60.33.128/2586.60.33.129 to 86.60.33.25486.60.33.255126
6986.60.34.0/2586.60.34.1 to 86.60.34.12686.60.34.127126
7086.60.34.128/2586.60.34.129 to 86.60.34.25486.60.34.255126
7186.60.35.0/2586.60.35.1 to 86.60.35.12686.60.35.127126
7286.60.35.128/2586.60.35.129 to 86.60.35.25486.60.35.255126
7386.60.36.0/2586.60.36.1 to 86.60.36.12686.60.36.127126
7486.60.36.128/2586.60.36.129 to 86.60.36.25486.60.36.255126
7586.60.37.0/2586.60.37.1 to 86.60.37.12686.60.37.127126
7686.60.37.128/2586.60.37.129 to 86.60.37.25486.60.37.255126
7786.60.38.0/2586.60.38.1 to 86.60.38.12686.60.38.127126
7886.60.38.128/2586.60.38.129 to 86.60.38.25486.60.38.255126
7986.60.39.0/2586.60.39.1 to 86.60.39.12686.60.39.127126
8086.60.39.128/2586.60.39.129 to 86.60.39.25486.60.39.255126
8186.60.40.0/2586.60.40.1 to 86.60.40.12686.60.40.127126
8286.60.40.128/2586.60.40.129 to 86.60.40.25486.60.40.255126
8386.60.41.0/2586.60.41.1 to 86.60.41.12686.60.41.127126
8486.60.41.128/2586.60.41.129 to 86.60.41.25486.60.41.255126
8586.60.42.0/2586.60.42.1 to 86.60.42.12686.60.42.127126
8686.60.42.128/2586.60.42.129 to 86.60.42.25486.60.42.255126
8786.60.43.0/2586.60.43.1 to 86.60.43.12686.60.43.127126
8886.60.43.128/2586.60.43.129 to 86.60.43.25486.60.43.255126
8986.60.44.0/2586.60.44.1 to 86.60.44.12686.60.44.127126
9086.60.44.128/2586.60.44.129 to 86.60.44.25486.60.44.255126
9186.60.45.0/2586.60.45.1 to 86.60.45.12686.60.45.127126
9286.60.45.128/2586.60.45.129 to 86.60.45.25486.60.45.255126
9386.60.46.0/2586.60.46.1 to 86.60.46.12686.60.46.127126
9486.60.46.128/2586.60.46.129 to 86.60.46.25486.60.46.255126
9586.60.47.0/2586.60.47.1 to 86.60.47.12686.60.47.127126
9686.60.47.128/2586.60.47.129 to 86.60.47.25486.60.47.255126
9786.60.48.0/2586.60.48.1 to 86.60.48.12686.60.48.127126
9886.60.48.128/2586.60.48.129 to 86.60.48.25486.60.48.255126
9986.60.49.0/2586.60.49.1 to 86.60.49.12686.60.49.127126
10086.60.49.128/2586.60.49.129 to 86.60.49.25486.60.49.255126
10186.60.50.0/2586.60.50.1 to 86.60.50.12686.60.50.127126
10286.60.50.128/2586.60.50.129 to 86.60.50.25486.60.50.255126
10386.60.51.0/2586.60.51.1 to 86.60.51.12686.60.51.127126
10486.60.51.128/2586.60.51.129 to 86.60.51.25486.60.51.255126
10586.60.52.0/2586.60.52.1 to 86.60.52.12686.60.52.127126
10686.60.52.128/2586.60.52.129 to 86.60.52.25486.60.52.255126
10786.60.53.0/2586.60.53.1 to 86.60.53.12686.60.53.127126
10886.60.53.128/2586.60.53.129 to 86.60.53.25486.60.53.255126
10986.60.54.0/2586.60.54.1 to 86.60.54.12686.60.54.127126
11086.60.54.128/2586.60.54.129 to 86.60.54.25486.60.54.255126
11186.60.55.0/2586.60.55.1 to 86.60.55.12686.60.55.127126
11286.60.55.128/2586.60.55.129 to 86.60.55.25486.60.55.255126
11386.60.56.0/2586.60.56.1 to 86.60.56.12686.60.56.127126
11486.60.56.128/2586.60.56.129 to 86.60.56.25486.60.56.255126
11586.60.57.0/2586.60.57.1 to 86.60.57.12686.60.57.127126
11686.60.57.128/2586.60.57.129 to 86.60.57.25486.60.57.255126
11786.60.58.0/2586.60.58.1 to 86.60.58.12686.60.58.127126
11886.60.58.128/2586.60.58.129 to 86.60.58.25486.60.58.255126
11986.60.59.0/2586.60.59.1 to 86.60.59.12686.60.59.127126
12086.60.59.128/2586.60.59.129 to 86.60.59.25486.60.59.255126
12186.60.60.0/2586.60.60.1 to 86.60.60.12686.60.60.127126
12286.60.60.128/2586.60.60.129 to 86.60.60.25486.60.60.255126
12386.60.61.0/2586.60.61.1 to 86.60.61.12686.60.61.127126
12486.60.61.128/2586.60.61.129 to 86.60.61.25486.60.61.255126
12586.60.62.0/2586.60.62.1 to 86.60.62.12686.60.62.127126
12686.60.62.128/2586.60.62.129 to 86.60.62.25486.60.62.255126
12786.60.63.0/2586.60.63.1 to 86.60.63.12686.60.63.127126
12886.60.63.128/2586.60.63.129 to 86.60.63.25486.60.63.255126
12986.60.64.0/2586.60.64.1 to 86.60.64.12686.60.64.127126
13086.60.64.128/2586.60.64.129 to 86.60.64.25486.60.64.255126
13186.60.65.0/2586.60.65.1 to 86.60.65.12686.60.65.127126
13286.60.65.128/2586.60.65.129 to 86.60.65.25486.60.65.255126
13386.60.66.0/2586.60.66.1 to 86.60.66.12686.60.66.127126
13486.60.66.128/2586.60.66.129 to 86.60.66.25486.60.66.255126
13586.60.67.0/2586.60.67.1 to 86.60.67.12686.60.67.127126
13686.60.67.128/2586.60.67.129 to 86.60.67.25486.60.67.255126
13786.60.68.0/2586.60.68.1 to 86.60.68.12686.60.68.127126
13886.60.68.128/2586.60.68.129 to 86.60.68.25486.60.68.255126
13986.60.69.0/2586.60.69.1 to 86.60.69.12686.60.69.127126
14086.60.69.128/2586.60.69.129 to 86.60.69.25486.60.69.255126
14186.60.70.0/2586.60.70.1 to 86.60.70.12686.60.70.127126
14286.60.70.128/2586.60.70.129 to 86.60.70.25486.60.70.255126
14386.60.71.0/2586.60.71.1 to 86.60.71.12686.60.71.127126
14486.60.71.128/2586.60.71.129 to 86.60.71.25486.60.71.255126
14586.60.72.0/2586.60.72.1 to 86.60.72.12686.60.72.127126
14686.60.72.128/2586.60.72.129 to 86.60.72.25486.60.72.255126
14786.60.73.0/2586.60.73.1 to 86.60.73.12686.60.73.127126
14886.60.73.128/2586.60.73.129 to 86.60.73.25486.60.73.255126
14986.60.74.0/2586.60.74.1 to 86.60.74.12686.60.74.127126
15086.60.74.128/2586.60.74.129 to 86.60.74.25486.60.74.255126
15186.60.75.0/2586.60.75.1 to 86.60.75.12686.60.75.127126
15286.60.75.128/2586.60.75.129 to 86.60.75.25486.60.75.255126
15386.60.76.0/2586.60.76.1 to 86.60.76.12686.60.76.127126
15486.60.76.128/2586.60.76.129 to 86.60.76.25486.60.76.255126
15586.60.77.0/2586.60.77.1 to 86.60.77.12686.60.77.127126
15686.60.77.128/2586.60.77.129 to 86.60.77.25486.60.77.255126
15786.60.78.0/2586.60.78.1 to 86.60.78.12686.60.78.127126
15886.60.78.128/2586.60.78.129 to 86.60.78.25486.60.78.255126
15986.60.79.0/2586.60.79.1 to 86.60.79.12686.60.79.127126
16086.60.79.128/2586.60.79.129 to 86.60.79.25486.60.79.255126
16186.60.80.0/2586.60.80.1 to 86.60.80.12686.60.80.127126
16286.60.80.128/2586.60.80.129 to 86.60.80.25486.60.80.255126
16386.60.81.0/2586.60.81.1 to 86.60.81.12686.60.81.127126
16486.60.81.128/2586.60.81.129 to 86.60.81.25486.60.81.255126
16586.60.82.0/2586.60.82.1 to 86.60.82.12686.60.82.127126
16686.60.82.128/2586.60.82.129 to 86.60.82.25486.60.82.255126
16786.60.83.0/2586.60.83.1 to 86.60.83.12686.60.83.127126
16886.60.83.128/2586.60.83.129 to 86.60.83.25486.60.83.255126
16986.60.84.0/2586.60.84.1 to 86.60.84.12686.60.84.127126
17086.60.84.128/2586.60.84.129 to 86.60.84.25486.60.84.255126
17186.60.85.0/2586.60.85.1 to 86.60.85.12686.60.85.127126
17286.60.85.128/2586.60.85.129 to 86.60.85.25486.60.85.255126
17386.60.86.0/2586.60.86.1 to 86.60.86.12686.60.86.127126
17486.60.86.128/2586.60.86.129 to 86.60.86.25486.60.86.255126
17586.60.87.0/2586.60.87.1 to 86.60.87.12686.60.87.127126
17686.60.87.128/2586.60.87.129 to 86.60.87.25486.60.87.255126
17786.60.88.0/2586.60.88.1 to 86.60.88.12686.60.88.127126
17886.60.88.128/2586.60.88.129 to 86.60.88.25486.60.88.255126
17986.60.89.0/2586.60.89.1 to 86.60.89.12686.60.89.127126
18086.60.89.128/2586.60.89.129 to 86.60.89.25486.60.89.255126
18186.60.90.0/2586.60.90.1 to 86.60.90.12686.60.90.127126
18286.60.90.128/2586.60.90.129 to 86.60.90.25486.60.90.255126
18386.60.91.0/2586.60.91.1 to 86.60.91.12686.60.91.127126
18486.60.91.128/2586.60.91.129 to 86.60.91.25486.60.91.255126
18586.60.92.0/2586.60.92.1 to 86.60.92.12686.60.92.127126
18686.60.92.128/2586.60.92.129 to 86.60.92.25486.60.92.255126
18786.60.93.0/2586.60.93.1 to 86.60.93.12686.60.93.127126
18886.60.93.128/2586.60.93.129 to 86.60.93.25486.60.93.255126
18986.60.94.0/2586.60.94.1 to 86.60.94.12686.60.94.127126
19086.60.94.128/2586.60.94.129 to 86.60.94.25486.60.94.255126
19186.60.95.0/2586.60.95.1 to 86.60.95.12686.60.95.127126
19286.60.95.128/2586.60.95.129 to 86.60.95.25486.60.95.255126
19386.60.96.0/2586.60.96.1 to 86.60.96.12686.60.96.127126
19486.60.96.128/2586.60.96.129 to 86.60.96.25486.60.96.255126
19586.60.97.0/2586.60.97.1 to 86.60.97.12686.60.97.127126
19686.60.97.128/2586.60.97.129 to 86.60.97.25486.60.97.255126
19786.60.98.0/2586.60.98.1 to 86.60.98.12686.60.98.127126
19886.60.98.128/2586.60.98.129 to 86.60.98.25486.60.98.255126
19986.60.99.0/2586.60.99.1 to 86.60.99.12686.60.99.127126
20086.60.99.128/2586.60.99.129 to 86.60.99.25486.60.99.255126
20186.60.100.0/2586.60.100.1 to 86.60.100.12686.60.100.127126
20286.60.100.128/2586.60.100.129 to 86.60.100.25486.60.100.255126
20386.60.101.0/2586.60.101.1 to 86.60.101.12686.60.101.127126
20486.60.101.128/2586.60.101.129 to 86.60.101.25486.60.101.255126
20586.60.102.0/2586.60.102.1 to 86.60.102.12686.60.102.127126
20686.60.102.128/2586.60.102.129 to 86.60.102.25486.60.102.255126
20786.60.103.0/2586.60.103.1 to 86.60.103.12686.60.103.127126
20886.60.103.128/2586.60.103.129 to 86.60.103.25486.60.103.255126
20986.60.104.0/2586.60.104.1 to 86.60.104.12686.60.104.127126
21086.60.104.128/2586.60.104.129 to 86.60.104.25486.60.104.255126
21186.60.105.0/2586.60.105.1 to 86.60.105.12686.60.105.127126
21286.60.105.128/2586.60.105.129 to 86.60.105.25486.60.105.255126
21386.60.106.0/2586.60.106.1 to 86.60.106.12686.60.106.127126
21486.60.106.128/2586.60.106.129 to 86.60.106.25486.60.106.255126
21586.60.107.0/2586.60.107.1 to 86.60.107.12686.60.107.127126
21686.60.107.128/2586.60.107.129 to 86.60.107.25486.60.107.255126
21786.60.108.0/2586.60.108.1 to 86.60.108.12686.60.108.127126
21886.60.108.128/2586.60.108.129 to 86.60.108.25486.60.108.255126
21986.60.109.0/2586.60.109.1 to 86.60.109.12686.60.109.127126
22086.60.109.128/2586.60.109.129 to 86.60.109.25486.60.109.255126
22186.60.110.0/2586.60.110.1 to 86.60.110.12686.60.110.127126
22286.60.110.128/2586.60.110.129 to 86.60.110.25486.60.110.255126
22386.60.111.0/2586.60.111.1 to 86.60.111.12686.60.111.127126
22486.60.111.128/2586.60.111.129 to 86.60.111.25486.60.111.255126
22586.60.112.0/2586.60.112.1 to 86.60.112.12686.60.112.127126
22686.60.112.128/2586.60.112.129 to 86.60.112.25486.60.112.255126
22786.60.113.0/2586.60.113.1 to 86.60.113.12686.60.113.127126
22886.60.113.128/2586.60.113.129 to 86.60.113.25486.60.113.255126
22986.60.114.0/2586.60.114.1 to 86.60.114.12686.60.114.127126
23086.60.114.128/2586.60.114.129 to 86.60.114.25486.60.114.255126
23186.60.115.0/2586.60.115.1 to 86.60.115.12686.60.115.127126
23286.60.115.128/2586.60.115.129 to 86.60.115.25486.60.115.255126
23386.60.116.0/2586.60.116.1 to 86.60.116.12686.60.116.127126
23486.60.116.128/2586.60.116.129 to 86.60.116.25486.60.116.255126
23586.60.117.0/2586.60.117.1 to 86.60.117.12686.60.117.127126
23686.60.117.128/2586.60.117.129 to 86.60.117.25486.60.117.255126
23786.60.118.0/2586.60.118.1 to 86.60.118.12686.60.118.127126
23886.60.118.128/2586.60.118.129 to 86.60.118.25486.60.118.255126
23986.60.119.0/2586.60.119.1 to 86.60.119.12686.60.119.127126
24086.60.119.128/2586.60.119.129 to 86.60.119.25486.60.119.255126
24186.60.120.0/2586.60.120.1 to 86.60.120.12686.60.120.127126
24286.60.120.128/2586.60.120.129 to 86.60.120.25486.60.120.255126
24386.60.121.0/2586.60.121.1 to 86.60.121.12686.60.121.127126
24486.60.121.128/2586.60.121.129 to 86.60.121.25486.60.121.255126
24586.60.122.0/2586.60.122.1 to 86.60.122.12686.60.122.127126
24686.60.122.128/2586.60.122.129 to 86.60.122.25486.60.122.255126
24786.60.123.0/2586.60.123.1 to 86.60.123.12686.60.123.127126
24886.60.123.128/2586.60.123.129 to 86.60.123.25486.60.123.255126
24986.60.124.0/2586.60.124.1 to 86.60.124.12686.60.124.127126
25086.60.124.128/2586.60.124.129 to 86.60.124.25486.60.124.255126
25186.60.125.0/2586.60.125.1 to 86.60.125.12686.60.125.127126
25286.60.125.128/2586.60.125.129 to 86.60.125.25486.60.125.255126
25386.60.126.0/2586.60.126.1 to 86.60.126.12686.60.126.127126
25486.60.126.128/2586.60.126.129 to 86.60.126.25486.60.126.255126
25586.60.127.0/2586.60.127.1 to 86.60.127.12686.60.127.127126
25686.60.127.128/2586.60.127.129 to 86.60.127.25486.60.127.255126

IPv4 CIDR reference (/0 to /32)

IPv4 prefix lengths
PrefixSubnet maskWildcardAddressesUsable hostsSizeTypical use
/00.0.0.0255.255.255.2554,294,967,2964,294,967,29416,777,216 × /24
/1128.0.0.0127.255.255.2552,147,483,6482,147,483,6468,388,608 × /24
/2192.0.0.063.255.255.2551,073,741,8241,073,741,8224,194,304 × /24
/3224.0.0.031.255.255.255536,870,912536,870,9102,097,152 × /24
/4240.0.0.015.255.255.255268,435,456268,435,4541,048,576 × /24
/5248.0.0.07.255.255.255134,217,728134,217,726524,288 × /24
/6252.0.0.03.255.255.25567,108,86467,108,862262,144 × /24
/7254.0.0.01.255.255.25533,554,43233,554,430131,072 × /24
/8255.0.0.00.255.255.25516,777,21616,777,21465,536 × /24Old class A; 10.0.0.0/8
/9255.128.0.00.127.255.2558,388,6088,388,60632,768 × /24
/10255.192.0.00.63.255.2554,194,3044,194,30216,384 × /24
/11255.224.0.00.31.255.2552,097,1522,097,1508,192 × /24
/12255.240.0.00.15.255.2551,048,5761,048,5744,096 × /24172.16.0.0/12
/13255.248.0.00.7.255.255524,288524,2862,048 × /24
/14255.252.0.00.3.255.255262,144262,1421,024 × /24
/15255.254.0.00.1.255.255131,072131,070512 × /24
/16255.255.0.00.0.255.25565,53665,534256 × /24Old class B; 192.168.0.0/16
/17255.255.128.00.0.127.25532,76832,766128 × /24
/18255.255.192.00.0.63.25516,38416,38264 × /24
/19255.255.224.00.0.31.2558,1928,19032 × /24
/20255.255.240.00.0.15.2554,0964,09416 × /24
/21255.255.248.00.0.7.2552,0482,0468 × /24
/22255.255.252.00.0.3.2551,0241,0224 × /24Large office or guest Wi-Fi (1,022 hosts)
/23255.255.254.00.0.1.2555125102 × /24Larger office LAN (510 hosts)
/24255.255.255.00.0.0.2552562541 × /24Typical office LAN (old class C)
/25255.255.255.1280.0.0.1271281261/2 of a /24Smaller LAN or VLAN
/26255.255.255.1920.0.0.6364621/4 of a /24Smaller LAN or VLAN
/27255.255.255.2240.0.0.3132301/8 of a /24Small VLAN, phones, cameras
/28255.255.255.2400.0.0.1516141/16 of a /24Small VLAN, phones, cameras
/29255.255.255.2480.0.0.7861/32 of a /24Small fixed public block (5 usable)
/30255.255.255.2520.0.0.3421/64 of a /24Point-to-point (old style)
/31255.255.255.2540.0.0.1221/128 of a /24Point-to-point link (RFC 3021)
/32255.255.255.2550.0.0.0111/256 of a /24One host

IPv6 prefix reference

IPv6 prefix lengths
PrefixAddresses/64 LANs/48 sitesNibbleTypical use
/342,535,295,865,117,307,932,921,825,928,971,026,432 (2^125)2,305,843,009,213,693,95235,184,372,088,832NoAll global unicast (2000::/3)
/165,192,296,858,534,827,628,530,496,329,220,096 (2^112)281,474,976,710,6564,294,967,296Yes
/20324,518,553,658,426,726,783,156,020,576,256 (2^108)17,592,186,044,416268,435,456YesLarge provider allocation (RIPE minimum for some)
/29633,825,300,114,114,700,748,351,602,688 (2^99)34,359,738,368524,288NoRIPE allocation to a provider (often)
/3279,228,162,514,264,337,593,543,950,336 (2^96)4,294,967,29665,536YesProvider allocation (RIPE default)
/364,951,760,157,141,521,099,596,496,896 (2^92)268,435,4564,096Yes
/40309,485,009,821,345,068,724,781,056 (2^88)16,777,216256Yes
/4419,342,813,113,834,066,795,298,816 (2^84)1,048,57616Yes
/481,208,925,819,614,629,174,706,176 (2^80)65,5361YesOne site or organisation (RIPE PI / assignment)
/5275,557,863,725,914,323,419,136 (2^76)4,096Yes
/564,722,366,482,869,645,213,696 (2^72)256YesSmall site or home (common provider assignment)
/60295,147,905,179,352,825,856 (2^68)16YesSome home broadband (16 LANs)
/6418,446,744,073,709,551,616 (2^64)1YesOne LAN or VLAN (needed for SLAAC)
/7272,057,594,037,927,936 (2^56)1/256 of a /64Yes
/80281,474,976,710,656 (2^48)1/65,536 of a /64Yes
/964,294,967,2961/4,294,967,296 of a /64YesEmbeds an IPv4 address (NAT64)
/11265,5361/281,474,976,710,656 of a /64Yes
/1202561/72,057,594,037,927,936 of a /64Yes
/124161/1,152,921,504,606,846,976 of a /64Yes
/12641/4,611,686,018,427,387,904 of a /64No
/12721/9,223,372,036,854,775,808 of a /64NoPoint-to-point link (RFC 6164)
/12811/18,446,744,073,709,551,616 of a /64YesOne host or loopback

Private and special ranges

IPv4

Special-purpose ranges
RangeNameWhat it is
255.255.255.255/32Limited broadcastEvery host on the local network
0.0.0.0/8This networkNot routed; 0.0.0.0 means "any address" in settings
10.0.0.0/8Private (RFC 1918)Office and home networks; not routed on the internet
100.64.0.0/10Shared address space (CGNAT)Used by providers behind carrier-grade NAT (RFC 6598)
127.0.0.0/8LoopbackThis computer
169.254.0.0/16Link-local (APIPA)Self-assigned when no DHCP server answers
172.16.0.0/12Private (RFC 1918)Office and home networks; not routed on the internet
192.0.0.0/24IETF protocol assignmentsSpecial uses such as DS-Lite
192.0.2.0/24Documentation (TEST-NET-1)For examples; never used on a network
192.88.99.0/246to4 relay (deprecated)Formerly anycast for 6to4
192.168.0.0/16Private (RFC 1918)Office and home networks; not routed on the internet
198.18.0.0/15BenchmarkingNetwork equipment testing (RFC 2544)
198.51.100.0/24Documentation (TEST-NET-2)For examples; never used on a network
203.0.113.0/24Documentation (TEST-NET-3)For examples; never used on a network
224.0.0.0/4MulticastOne-to-many traffic, such as IPTV and routing protocols
240.0.0.0/4ReservedFuture use; not usable on most systems

IPv6

Special-purpose ranges
RangeNameWhat it is
::/128UnspecifiedNo address; :: means "any address" in settings
::1/128LoopbackThis computer
::ffff:0:0/96IPv4-mappedAn IPv4 address written as IPv6
64:ff9b::/96NAT64IPv4 addresses reached through a NAT64 gateway
100::/64Discard onlyTraffic sent here is dropped (RFC 6666)
2001:db8::/32DocumentationFor examples; never used on a network
2001::/32TeredoIPv6 tunnelled over IPv4 UDP
2002::/166to4IPv6 tunnelled over IPv4 (largely retired)
3fff::/20DocumentationFor examples (RFC 9637)
fc00::/7Unique local (ULA)Private IPv6, like RFC 1918; usually fd00::/8
fe80::/10Link-localEvery IPv6 interface has one; not routed
ff00::/8MulticastOne-to-many traffic; replaces broadcast
2000::/3Global unicastPublic internet addresses

About this tool

A network is written as an address and a prefix length, such as 192.168.1.0/24: the first 24 bits name the network and the rest number the devices on it. The calculator works out where the network starts and ends, how many devices it holds, its subnet and wildcard masks, and the reverse DNS zone to ask your provider for.

It also splits a network into equal smaller ones (one per VLAN or site), turns a range of addresses into the fewest CIDR blocks for a firewall rule, and lists every IPv4 prefix length and the common IPv6 ones in reference tables.

Common questions

Why are two addresses lost in every IPv4 subnet?

The first address names the network and the last is the broadcast address, so a /24 has 256 addresses but 254 for devices. A /31 (a link between two routers) and a /32 (one host) are the exceptions.

What size of IPv6 network should a LAN use?

Always /64. Devices pick their own address within it (SLAAC), which needs the full 64 bits. A site usually gets a /48 or /56 from its provider, which holds 65,536 or 256 LANs.

What is a wildcard mask?

The subnet mask turned inside out: 255.255.255.0 becomes 0.0.0.255. Cisco access lists and OSPF use it to say which bits must match.

Which ranges can I use inside an office?

IPv4: 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16. IPv6: unique local addresses from fd00::/8, though most networks use the public prefix from their provider.