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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)10.237.0.0/16
network10.237.0.0/16
broadcast10.237.255.255
first host10.237.0.1
last host10.237.255.254
subnet mask255.255.0.0
wildcard0.0.255.255
addresses65,536
usable hosts65,534
classA
ipcalc 10.237.0.0/16
address00001010.11101101.00000000.00000000
subnet mask11111111.11111111.00000000.00000000
network00001010.11101101.00000000.00000000
broadcast00001010.11101101.11111111.11111111
green = network part, grey = host part
hex0x0aed0000
decimal183304192
reverse dns0.0.237.10.in-addr.arpa
ipv4-mapped::ffff:aed:0

/16 split into /22 · 64 subnets

close ×
#networkhost rangebroadcast
110.237.0.0/2210.237.0.1 – 10.237.3.25410.237.3.255
210.237.4.0/2210.237.4.1 – 10.237.7.25410.237.7.255
310.237.8.0/2210.237.8.1 – 10.237.11.25410.237.11.255
410.237.12.0/2210.237.12.1 – 10.237.15.25410.237.15.255
510.237.16.0/2210.237.16.1 – 10.237.19.25410.237.19.255
610.237.20.0/2210.237.20.1 – 10.237.23.25410.237.23.255
710.237.24.0/2210.237.24.1 – 10.237.27.25410.237.27.255
810.237.28.0/2210.237.28.1 – 10.237.31.25410.237.31.255
910.237.32.0/2210.237.32.1 – 10.237.35.25410.237.35.255
1010.237.36.0/2210.237.36.1 – 10.237.39.25410.237.39.255
1110.237.40.0/2210.237.40.1 – 10.237.43.25410.237.43.255
1210.237.44.0/2210.237.44.1 – 10.237.47.25410.237.47.255
1310.237.48.0/2210.237.48.1 – 10.237.51.25410.237.51.255
1410.237.52.0/2210.237.52.1 – 10.237.55.25410.237.55.255
1510.237.56.0/2210.237.56.1 – 10.237.59.25410.237.59.255
1610.237.60.0/2210.237.60.1 – 10.237.63.25410.237.63.255
1710.237.64.0/2210.237.64.1 – 10.237.67.25410.237.67.255
1810.237.68.0/2210.237.68.1 – 10.237.71.25410.237.71.255
1910.237.72.0/2210.237.72.1 – 10.237.75.25410.237.75.255
2010.237.76.0/2210.237.76.1 – 10.237.79.25410.237.79.255
2110.237.80.0/2210.237.80.1 – 10.237.83.25410.237.83.255
2210.237.84.0/2210.237.84.1 – 10.237.87.25410.237.87.255
2310.237.88.0/2210.237.88.1 – 10.237.91.25410.237.91.255
2410.237.92.0/2210.237.92.1 – 10.237.95.25410.237.95.255
2510.237.96.0/2210.237.96.1 – 10.237.99.25410.237.99.255
2610.237.100.0/2210.237.100.1 – 10.237.103.25410.237.103.255
2710.237.104.0/2210.237.104.1 – 10.237.107.25410.237.107.255
2810.237.108.0/2210.237.108.1 – 10.237.111.25410.237.111.255
2910.237.112.0/2210.237.112.1 – 10.237.115.25410.237.115.255
3010.237.116.0/2210.237.116.1 – 10.237.119.25410.237.119.255
3110.237.120.0/2210.237.120.1 – 10.237.123.25410.237.123.255
3210.237.124.0/2210.237.124.1 – 10.237.127.25410.237.127.255
3310.237.128.0/2210.237.128.1 – 10.237.131.25410.237.131.255
3410.237.132.0/2210.237.132.1 – 10.237.135.25410.237.135.255
3510.237.136.0/2210.237.136.1 – 10.237.139.25410.237.139.255
3610.237.140.0/2210.237.140.1 – 10.237.143.25410.237.143.255
3710.237.144.0/2210.237.144.1 – 10.237.147.25410.237.147.255
3810.237.148.0/2210.237.148.1 – 10.237.151.25410.237.151.255
3910.237.152.0/2210.237.152.1 – 10.237.155.25410.237.155.255
4010.237.156.0/2210.237.156.1 – 10.237.159.25410.237.159.255
4110.237.160.0/2210.237.160.1 – 10.237.163.25410.237.163.255
4210.237.164.0/2210.237.164.1 – 10.237.167.25410.237.167.255
4310.237.168.0/2210.237.168.1 – 10.237.171.25410.237.171.255
4410.237.172.0/2210.237.172.1 – 10.237.175.25410.237.175.255
4510.237.176.0/2210.237.176.1 – 10.237.179.25410.237.179.255
4610.237.180.0/2210.237.180.1 – 10.237.183.25410.237.183.255
4710.237.184.0/2210.237.184.1 – 10.237.187.25410.237.187.255
4810.237.188.0/2210.237.188.1 – 10.237.191.25410.237.191.255
4910.237.192.0/2210.237.192.1 – 10.237.195.25410.237.195.255
5010.237.196.0/2210.237.196.1 – 10.237.199.25410.237.199.255
5110.237.200.0/2210.237.200.1 – 10.237.203.25410.237.203.255
5210.237.204.0/2210.237.204.1 – 10.237.207.25410.237.207.255
5310.237.208.0/2210.237.208.1 – 10.237.211.25410.237.211.255
5410.237.212.0/2210.237.212.1 – 10.237.215.25410.237.215.255
5510.237.216.0/2210.237.216.1 – 10.237.219.25410.237.219.255
5610.237.220.0/2210.237.220.1 – 10.237.223.25410.237.223.255
5710.237.224.0/2210.237.224.1 – 10.237.227.25410.237.227.255
5810.237.228.0/2210.237.228.1 – 10.237.231.25410.237.231.255
5910.237.232.0/2210.237.232.1 – 10.237.235.25410.237.235.255
6010.237.236.0/2210.237.236.1 – 10.237.239.25410.237.239.255
6110.237.240.0/2210.237.240.1 – 10.237.243.25410.237.243.255
6210.237.244.0/2210.237.244.1 – 10.237.247.25410.237.247.255
6310.237.248.0/2210.237.248.1 – 10.237.251.25410.237.251.255
6410.237.252.0/2210.237.252.1 – 10.237.255.25410.237.255.255
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 →