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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)10.72.0.0/16
network10.72.0.0/16
broadcast10.72.255.255
first host10.72.0.1
last host10.72.255.254
subnet mask255.255.0.0
wildcard0.0.255.255
addresses65,536
usable hosts65,534
classA
ipcalc 10.72.0.0/16
address00001010.01001000.00000000.00000000
subnet mask11111111.11111111.00000000.00000000
network00001010.01001000.00000000.00000000
broadcast00001010.01001000.11111111.11111111
green = network part, grey = host part
hex0x0a480000
decimal172490752
reverse dns0.0.72.10.in-addr.arpa
ipv4-mapped::ffff:a48:0

/16 split into /22 · 64 subnets

close ×
#networkhost rangebroadcast
110.72.0.0/2210.72.0.1 – 10.72.3.25410.72.3.255
210.72.4.0/2210.72.4.1 – 10.72.7.25410.72.7.255
310.72.8.0/2210.72.8.1 – 10.72.11.25410.72.11.255
410.72.12.0/2210.72.12.1 – 10.72.15.25410.72.15.255
510.72.16.0/2210.72.16.1 – 10.72.19.25410.72.19.255
610.72.20.0/2210.72.20.1 – 10.72.23.25410.72.23.255
710.72.24.0/2210.72.24.1 – 10.72.27.25410.72.27.255
810.72.28.0/2210.72.28.1 – 10.72.31.25410.72.31.255
910.72.32.0/2210.72.32.1 – 10.72.35.25410.72.35.255
1010.72.36.0/2210.72.36.1 – 10.72.39.25410.72.39.255
1110.72.40.0/2210.72.40.1 – 10.72.43.25410.72.43.255
1210.72.44.0/2210.72.44.1 – 10.72.47.25410.72.47.255
1310.72.48.0/2210.72.48.1 – 10.72.51.25410.72.51.255
1410.72.52.0/2210.72.52.1 – 10.72.55.25410.72.55.255
1510.72.56.0/2210.72.56.1 – 10.72.59.25410.72.59.255
1610.72.60.0/2210.72.60.1 – 10.72.63.25410.72.63.255
1710.72.64.0/2210.72.64.1 – 10.72.67.25410.72.67.255
1810.72.68.0/2210.72.68.1 – 10.72.71.25410.72.71.255
1910.72.72.0/2210.72.72.1 – 10.72.75.25410.72.75.255
2010.72.76.0/2210.72.76.1 – 10.72.79.25410.72.79.255
2110.72.80.0/2210.72.80.1 – 10.72.83.25410.72.83.255
2210.72.84.0/2210.72.84.1 – 10.72.87.25410.72.87.255
2310.72.88.0/2210.72.88.1 – 10.72.91.25410.72.91.255
2410.72.92.0/2210.72.92.1 – 10.72.95.25410.72.95.255
2510.72.96.0/2210.72.96.1 – 10.72.99.25410.72.99.255
2610.72.100.0/2210.72.100.1 – 10.72.103.25410.72.103.255
2710.72.104.0/2210.72.104.1 – 10.72.107.25410.72.107.255
2810.72.108.0/2210.72.108.1 – 10.72.111.25410.72.111.255
2910.72.112.0/2210.72.112.1 – 10.72.115.25410.72.115.255
3010.72.116.0/2210.72.116.1 – 10.72.119.25410.72.119.255
3110.72.120.0/2210.72.120.1 – 10.72.123.25410.72.123.255
3210.72.124.0/2210.72.124.1 – 10.72.127.25410.72.127.255
3310.72.128.0/2210.72.128.1 – 10.72.131.25410.72.131.255
3410.72.132.0/2210.72.132.1 – 10.72.135.25410.72.135.255
3510.72.136.0/2210.72.136.1 – 10.72.139.25410.72.139.255
3610.72.140.0/2210.72.140.1 – 10.72.143.25410.72.143.255
3710.72.144.0/2210.72.144.1 – 10.72.147.25410.72.147.255
3810.72.148.0/2210.72.148.1 – 10.72.151.25410.72.151.255
3910.72.152.0/2210.72.152.1 – 10.72.155.25410.72.155.255
4010.72.156.0/2210.72.156.1 – 10.72.159.25410.72.159.255
4110.72.160.0/2210.72.160.1 – 10.72.163.25410.72.163.255
4210.72.164.0/2210.72.164.1 – 10.72.167.25410.72.167.255
4310.72.168.0/2210.72.168.1 – 10.72.171.25410.72.171.255
4410.72.172.0/2210.72.172.1 – 10.72.175.25410.72.175.255
4510.72.176.0/2210.72.176.1 – 10.72.179.25410.72.179.255
4610.72.180.0/2210.72.180.1 – 10.72.183.25410.72.183.255
4710.72.184.0/2210.72.184.1 – 10.72.187.25410.72.187.255
4810.72.188.0/2210.72.188.1 – 10.72.191.25410.72.191.255
4910.72.192.0/2210.72.192.1 – 10.72.195.25410.72.195.255
5010.72.196.0/2210.72.196.1 – 10.72.199.25410.72.199.255
5110.72.200.0/2210.72.200.1 – 10.72.203.25410.72.203.255
5210.72.204.0/2210.72.204.1 – 10.72.207.25410.72.207.255
5310.72.208.0/2210.72.208.1 – 10.72.211.25410.72.211.255
5410.72.212.0/2210.72.212.1 – 10.72.215.25410.72.215.255
5510.72.216.0/2210.72.216.1 – 10.72.219.25410.72.219.255
5610.72.220.0/2210.72.220.1 – 10.72.223.25410.72.223.255
5710.72.224.0/2210.72.224.1 – 10.72.227.25410.72.227.255
5810.72.228.0/2210.72.228.1 – 10.72.231.25410.72.231.255
5910.72.232.0/2210.72.232.1 – 10.72.235.25410.72.235.255
6010.72.236.0/2210.72.236.1 – 10.72.239.25410.72.239.255
6110.72.240.0/2210.72.240.1 – 10.72.243.25410.72.243.255
6210.72.244.0/2210.72.244.1 – 10.72.247.25410.72.247.255
6310.72.248.0/2210.72.248.1 – 10.72.251.25410.72.251.255
6410.72.252.0/2210.72.252.1 – 10.72.255.25410.72.255.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /16
/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-
/16255.255.0.065,53665,5341
/17255.255.128.032,76832,7662 split →
/18255.255.192.016,38416,3824 split →
/19255.255.224.08,1928,1908 split →
/20255.255.240.04,0964,09416 split →
/21255.255.248.02,0482,04632 split →
/22255.255.252.01,0241,02264 split →
/23255.255.254.0512510128 split →
/24255.255.255.0256254256 split →
/25255.255.255.128128126512 split →
/26255.255.255.19264621,024 split →
/27255.255.255.22432302,048 split →
/28255.255.255.24016144,096 split →
/29255.255.255.248868,192 split →
/30255.255.255.2524216,384 split →
/31255.255.255.2542232,768 split →
/32255.255.255.2551165,536 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 →