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IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

$ ipcalc
Try:192.168.1.10/2410.0.0.0/8172.16.5.4/20203.0.113.9/29
IPv6 calculator →
private IP (RFC 1918)10.31.0.0/18
network10.31.0.0/18
broadcast10.31.63.255
first host10.31.0.1
last host10.31.63.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.31.0.0/18
address00001010.00011111.00000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00011111.00000000.00000000
broadcast00001010.00011111.00111111.11111111
green = network part, grey = host part
hex0x0a1f0000
decimal169803776
reverse dns0.0.31.10.in-addr.arpa
ipv4-mapped::ffff:a1f:0

/18 split into /24 · 64 subnets

close ×
#networkhost rangebroadcast
110.31.0.0/2410.31.0.1 – 10.31.0.25410.31.0.255
210.31.1.0/2410.31.1.1 – 10.31.1.25410.31.1.255
310.31.2.0/2410.31.2.1 – 10.31.2.25410.31.2.255
410.31.3.0/2410.31.3.1 – 10.31.3.25410.31.3.255
510.31.4.0/2410.31.4.1 – 10.31.4.25410.31.4.255
610.31.5.0/2410.31.5.1 – 10.31.5.25410.31.5.255
710.31.6.0/2410.31.6.1 – 10.31.6.25410.31.6.255
810.31.7.0/2410.31.7.1 – 10.31.7.25410.31.7.255
910.31.8.0/2410.31.8.1 – 10.31.8.25410.31.8.255
1010.31.9.0/2410.31.9.1 – 10.31.9.25410.31.9.255
1110.31.10.0/2410.31.10.1 – 10.31.10.25410.31.10.255
1210.31.11.0/2410.31.11.1 – 10.31.11.25410.31.11.255
1310.31.12.0/2410.31.12.1 – 10.31.12.25410.31.12.255
1410.31.13.0/2410.31.13.1 – 10.31.13.25410.31.13.255
1510.31.14.0/2410.31.14.1 – 10.31.14.25410.31.14.255
1610.31.15.0/2410.31.15.1 – 10.31.15.25410.31.15.255
1710.31.16.0/2410.31.16.1 – 10.31.16.25410.31.16.255
1810.31.17.0/2410.31.17.1 – 10.31.17.25410.31.17.255
1910.31.18.0/2410.31.18.1 – 10.31.18.25410.31.18.255
2010.31.19.0/2410.31.19.1 – 10.31.19.25410.31.19.255
2110.31.20.0/2410.31.20.1 – 10.31.20.25410.31.20.255
2210.31.21.0/2410.31.21.1 – 10.31.21.25410.31.21.255
2310.31.22.0/2410.31.22.1 – 10.31.22.25410.31.22.255
2410.31.23.0/2410.31.23.1 – 10.31.23.25410.31.23.255
2510.31.24.0/2410.31.24.1 – 10.31.24.25410.31.24.255
2610.31.25.0/2410.31.25.1 – 10.31.25.25410.31.25.255
2710.31.26.0/2410.31.26.1 – 10.31.26.25410.31.26.255
2810.31.27.0/2410.31.27.1 – 10.31.27.25410.31.27.255
2910.31.28.0/2410.31.28.1 – 10.31.28.25410.31.28.255
3010.31.29.0/2410.31.29.1 – 10.31.29.25410.31.29.255
3110.31.30.0/2410.31.30.1 – 10.31.30.25410.31.30.255
3210.31.31.0/2410.31.31.1 – 10.31.31.25410.31.31.255
3310.31.32.0/2410.31.32.1 – 10.31.32.25410.31.32.255
3410.31.33.0/2410.31.33.1 – 10.31.33.25410.31.33.255
3510.31.34.0/2410.31.34.1 – 10.31.34.25410.31.34.255
3610.31.35.0/2410.31.35.1 – 10.31.35.25410.31.35.255
3710.31.36.0/2410.31.36.1 – 10.31.36.25410.31.36.255
3810.31.37.0/2410.31.37.1 – 10.31.37.25410.31.37.255
3910.31.38.0/2410.31.38.1 – 10.31.38.25410.31.38.255
4010.31.39.0/2410.31.39.1 – 10.31.39.25410.31.39.255
4110.31.40.0/2410.31.40.1 – 10.31.40.25410.31.40.255
4210.31.41.0/2410.31.41.1 – 10.31.41.25410.31.41.255
4310.31.42.0/2410.31.42.1 – 10.31.42.25410.31.42.255
4410.31.43.0/2410.31.43.1 – 10.31.43.25410.31.43.255
4510.31.44.0/2410.31.44.1 – 10.31.44.25410.31.44.255
4610.31.45.0/2410.31.45.1 – 10.31.45.25410.31.45.255
4710.31.46.0/2410.31.46.1 – 10.31.46.25410.31.46.255
4810.31.47.0/2410.31.47.1 – 10.31.47.25410.31.47.255
4910.31.48.0/2410.31.48.1 – 10.31.48.25410.31.48.255
5010.31.49.0/2410.31.49.1 – 10.31.49.25410.31.49.255
5110.31.50.0/2410.31.50.1 – 10.31.50.25410.31.50.255
5210.31.51.0/2410.31.51.1 – 10.31.51.25410.31.51.255
5310.31.52.0/2410.31.52.1 – 10.31.52.25410.31.52.255
5410.31.53.0/2410.31.53.1 – 10.31.53.25410.31.53.255
5510.31.54.0/2410.31.54.1 – 10.31.54.25410.31.54.255
5610.31.55.0/2410.31.55.1 – 10.31.55.25410.31.55.255
5710.31.56.0/2410.31.56.1 – 10.31.56.25410.31.56.255
5810.31.57.0/2410.31.57.1 – 10.31.57.25410.31.57.255
5910.31.58.0/2410.31.58.1 – 10.31.58.25410.31.58.255
6010.31.59.0/2410.31.59.1 – 10.31.59.25410.31.59.255
6110.31.60.0/2410.31.60.1 – 10.31.60.25410.31.60.255
6210.31.61.0/2410.31.61.1 – 10.31.61.25410.31.61.255
6310.31.62.0/2410.31.62.1 – 10.31.62.25410.31.62.255
6410.31.63.0/2410.31.63.1 – 10.31.63.25410.31.63.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /18
/00.0.0.04,294,967,2964,294,967,294-
/1128.0.0.02,147,483,6482,147,483,646-
/2192.0.0.01,073,741,8241,073,741,822-
/3224.0.0.0536,870,912536,870,910-
/4240.0.0.0268,435,456268,435,454-
/5248.0.0.0134,217,728134,217,726-
/6252.0.0.067,108,86467,108,862-
/7254.0.0.033,554,43233,554,430-
/8255.0.0.016,777,21616,777,214-
/9255.128.0.08,388,6088,388,606-
/10255.192.0.04,194,3044,194,302-
/11255.224.0.02,097,1522,097,150-
/12255.240.0.01,048,5761,048,574-
/13255.248.0.0524,288524,286-
/14255.252.0.0262,144262,142-
/15255.254.0.0131,072131,070-
/16255.255.0.065,53665,534-
/17255.255.128.032,76832,766-
/18255.255.192.016,38416,3821
/19255.255.224.08,1928,1902 split →
/20255.255.240.04,0964,0944 split →
/21255.255.248.02,0482,0468 split →
/22255.255.252.01,0241,02216 split →
/23255.255.254.051251032 split →
/24255.255.255.025625464 split →
/25255.255.255.128128126128 split →
/26255.255.255.1926462256 split →
/27255.255.255.2243230512 split →
/28255.255.255.24016141,024 split →
/29255.255.255.248862,048 split →
/30255.255.255.252424,096 split →
/31255.255.255.254228,192 split →
/32255.255.255.2551116,384 split →
02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →