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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)10.187.0.0/16
network10.187.0.0/16
broadcast10.187.255.255
first host10.187.0.1
last host10.187.255.254
subnet mask255.255.0.0
wildcard0.0.255.255
addresses65,536
usable hosts65,534
classA
ipcalc 10.187.0.0/16
address00001010.10111011.00000000.00000000
subnet mask11111111.11111111.00000000.00000000
network00001010.10111011.00000000.00000000
broadcast00001010.10111011.11111111.11111111
green = network part, grey = host part
hex0x0abb0000
decimal180027392
reverse dns0.0.187.10.in-addr.arpa
ipv4-mapped::ffff:abb:0

/16 split into /22 · 64 subnets

close ×
#networkhost rangebroadcast
110.187.0.0/2210.187.0.1 – 10.187.3.25410.187.3.255
210.187.4.0/2210.187.4.1 – 10.187.7.25410.187.7.255
310.187.8.0/2210.187.8.1 – 10.187.11.25410.187.11.255
410.187.12.0/2210.187.12.1 – 10.187.15.25410.187.15.255
510.187.16.0/2210.187.16.1 – 10.187.19.25410.187.19.255
610.187.20.0/2210.187.20.1 – 10.187.23.25410.187.23.255
710.187.24.0/2210.187.24.1 – 10.187.27.25410.187.27.255
810.187.28.0/2210.187.28.1 – 10.187.31.25410.187.31.255
910.187.32.0/2210.187.32.1 – 10.187.35.25410.187.35.255
1010.187.36.0/2210.187.36.1 – 10.187.39.25410.187.39.255
1110.187.40.0/2210.187.40.1 – 10.187.43.25410.187.43.255
1210.187.44.0/2210.187.44.1 – 10.187.47.25410.187.47.255
1310.187.48.0/2210.187.48.1 – 10.187.51.25410.187.51.255
1410.187.52.0/2210.187.52.1 – 10.187.55.25410.187.55.255
1510.187.56.0/2210.187.56.1 – 10.187.59.25410.187.59.255
1610.187.60.0/2210.187.60.1 – 10.187.63.25410.187.63.255
1710.187.64.0/2210.187.64.1 – 10.187.67.25410.187.67.255
1810.187.68.0/2210.187.68.1 – 10.187.71.25410.187.71.255
1910.187.72.0/2210.187.72.1 – 10.187.75.25410.187.75.255
2010.187.76.0/2210.187.76.1 – 10.187.79.25410.187.79.255
2110.187.80.0/2210.187.80.1 – 10.187.83.25410.187.83.255
2210.187.84.0/2210.187.84.1 – 10.187.87.25410.187.87.255
2310.187.88.0/2210.187.88.1 – 10.187.91.25410.187.91.255
2410.187.92.0/2210.187.92.1 – 10.187.95.25410.187.95.255
2510.187.96.0/2210.187.96.1 – 10.187.99.25410.187.99.255
2610.187.100.0/2210.187.100.1 – 10.187.103.25410.187.103.255
2710.187.104.0/2210.187.104.1 – 10.187.107.25410.187.107.255
2810.187.108.0/2210.187.108.1 – 10.187.111.25410.187.111.255
2910.187.112.0/2210.187.112.1 – 10.187.115.25410.187.115.255
3010.187.116.0/2210.187.116.1 – 10.187.119.25410.187.119.255
3110.187.120.0/2210.187.120.1 – 10.187.123.25410.187.123.255
3210.187.124.0/2210.187.124.1 – 10.187.127.25410.187.127.255
3310.187.128.0/2210.187.128.1 – 10.187.131.25410.187.131.255
3410.187.132.0/2210.187.132.1 – 10.187.135.25410.187.135.255
3510.187.136.0/2210.187.136.1 – 10.187.139.25410.187.139.255
3610.187.140.0/2210.187.140.1 – 10.187.143.25410.187.143.255
3710.187.144.0/2210.187.144.1 – 10.187.147.25410.187.147.255
3810.187.148.0/2210.187.148.1 – 10.187.151.25410.187.151.255
3910.187.152.0/2210.187.152.1 – 10.187.155.25410.187.155.255
4010.187.156.0/2210.187.156.1 – 10.187.159.25410.187.159.255
4110.187.160.0/2210.187.160.1 – 10.187.163.25410.187.163.255
4210.187.164.0/2210.187.164.1 – 10.187.167.25410.187.167.255
4310.187.168.0/2210.187.168.1 – 10.187.171.25410.187.171.255
4410.187.172.0/2210.187.172.1 – 10.187.175.25410.187.175.255
4510.187.176.0/2210.187.176.1 – 10.187.179.25410.187.179.255
4610.187.180.0/2210.187.180.1 – 10.187.183.25410.187.183.255
4710.187.184.0/2210.187.184.1 – 10.187.187.25410.187.187.255
4810.187.188.0/2210.187.188.1 – 10.187.191.25410.187.191.255
4910.187.192.0/2210.187.192.1 – 10.187.195.25410.187.195.255
5010.187.196.0/2210.187.196.1 – 10.187.199.25410.187.199.255
5110.187.200.0/2210.187.200.1 – 10.187.203.25410.187.203.255
5210.187.204.0/2210.187.204.1 – 10.187.207.25410.187.207.255
5310.187.208.0/2210.187.208.1 – 10.187.211.25410.187.211.255
5410.187.212.0/2210.187.212.1 – 10.187.215.25410.187.215.255
5510.187.216.0/2210.187.216.1 – 10.187.219.25410.187.219.255
5610.187.220.0/2210.187.220.1 – 10.187.223.25410.187.223.255
5710.187.224.0/2210.187.224.1 – 10.187.227.25410.187.227.255
5810.187.228.0/2210.187.228.1 – 10.187.231.25410.187.231.255
5910.187.232.0/2210.187.232.1 – 10.187.235.25410.187.235.255
6010.187.236.0/2210.187.236.1 – 10.187.239.25410.187.239.255
6110.187.240.0/2210.187.240.1 – 10.187.243.25410.187.243.255
6210.187.244.0/2210.187.244.1 – 10.187.247.25410.187.247.255
6310.187.248.0/2210.187.248.1 – 10.187.251.25410.187.251.255
6410.187.252.0/2210.187.252.1 – 10.187.255.25410.187.255.255
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 →