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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)10.248.0.0/16
network10.248.0.0/16
broadcast10.248.255.255
first host10.248.0.1
last host10.248.255.254
subnet mask255.255.0.0
wildcard0.0.255.255
addresses65,536
usable hosts65,534
classA
ipcalc 10.248.0.0/16
address00001010.11111000.00000000.00000000
subnet mask11111111.11111111.00000000.00000000
network00001010.11111000.00000000.00000000
broadcast00001010.11111000.11111111.11111111
green = network part, grey = host part
hex0x0af80000
decimal184025088
reverse dns0.0.248.10.in-addr.arpa
ipv4-mapped::ffff:af8:0

/16 split into /22 · 64 subnets

close ×
#networkhost rangebroadcast
110.248.0.0/2210.248.0.1 – 10.248.3.25410.248.3.255
210.248.4.0/2210.248.4.1 – 10.248.7.25410.248.7.255
310.248.8.0/2210.248.8.1 – 10.248.11.25410.248.11.255
410.248.12.0/2210.248.12.1 – 10.248.15.25410.248.15.255
510.248.16.0/2210.248.16.1 – 10.248.19.25410.248.19.255
610.248.20.0/2210.248.20.1 – 10.248.23.25410.248.23.255
710.248.24.0/2210.248.24.1 – 10.248.27.25410.248.27.255
810.248.28.0/2210.248.28.1 – 10.248.31.25410.248.31.255
910.248.32.0/2210.248.32.1 – 10.248.35.25410.248.35.255
1010.248.36.0/2210.248.36.1 – 10.248.39.25410.248.39.255
1110.248.40.0/2210.248.40.1 – 10.248.43.25410.248.43.255
1210.248.44.0/2210.248.44.1 – 10.248.47.25410.248.47.255
1310.248.48.0/2210.248.48.1 – 10.248.51.25410.248.51.255
1410.248.52.0/2210.248.52.1 – 10.248.55.25410.248.55.255
1510.248.56.0/2210.248.56.1 – 10.248.59.25410.248.59.255
1610.248.60.0/2210.248.60.1 – 10.248.63.25410.248.63.255
1710.248.64.0/2210.248.64.1 – 10.248.67.25410.248.67.255
1810.248.68.0/2210.248.68.1 – 10.248.71.25410.248.71.255
1910.248.72.0/2210.248.72.1 – 10.248.75.25410.248.75.255
2010.248.76.0/2210.248.76.1 – 10.248.79.25410.248.79.255
2110.248.80.0/2210.248.80.1 – 10.248.83.25410.248.83.255
2210.248.84.0/2210.248.84.1 – 10.248.87.25410.248.87.255
2310.248.88.0/2210.248.88.1 – 10.248.91.25410.248.91.255
2410.248.92.0/2210.248.92.1 – 10.248.95.25410.248.95.255
2510.248.96.0/2210.248.96.1 – 10.248.99.25410.248.99.255
2610.248.100.0/2210.248.100.1 – 10.248.103.25410.248.103.255
2710.248.104.0/2210.248.104.1 – 10.248.107.25410.248.107.255
2810.248.108.0/2210.248.108.1 – 10.248.111.25410.248.111.255
2910.248.112.0/2210.248.112.1 – 10.248.115.25410.248.115.255
3010.248.116.0/2210.248.116.1 – 10.248.119.25410.248.119.255
3110.248.120.0/2210.248.120.1 – 10.248.123.25410.248.123.255
3210.248.124.0/2210.248.124.1 – 10.248.127.25410.248.127.255
3310.248.128.0/2210.248.128.1 – 10.248.131.25410.248.131.255
3410.248.132.0/2210.248.132.1 – 10.248.135.25410.248.135.255
3510.248.136.0/2210.248.136.1 – 10.248.139.25410.248.139.255
3610.248.140.0/2210.248.140.1 – 10.248.143.25410.248.143.255
3710.248.144.0/2210.248.144.1 – 10.248.147.25410.248.147.255
3810.248.148.0/2210.248.148.1 – 10.248.151.25410.248.151.255
3910.248.152.0/2210.248.152.1 – 10.248.155.25410.248.155.255
4010.248.156.0/2210.248.156.1 – 10.248.159.25410.248.159.255
4110.248.160.0/2210.248.160.1 – 10.248.163.25410.248.163.255
4210.248.164.0/2210.248.164.1 – 10.248.167.25410.248.167.255
4310.248.168.0/2210.248.168.1 – 10.248.171.25410.248.171.255
4410.248.172.0/2210.248.172.1 – 10.248.175.25410.248.175.255
4510.248.176.0/2210.248.176.1 – 10.248.179.25410.248.179.255
4610.248.180.0/2210.248.180.1 – 10.248.183.25410.248.183.255
4710.248.184.0/2210.248.184.1 – 10.248.187.25410.248.187.255
4810.248.188.0/2210.248.188.1 – 10.248.191.25410.248.191.255
4910.248.192.0/2210.248.192.1 – 10.248.195.25410.248.195.255
5010.248.196.0/2210.248.196.1 – 10.248.199.25410.248.199.255
5110.248.200.0/2210.248.200.1 – 10.248.203.25410.248.203.255
5210.248.204.0/2210.248.204.1 – 10.248.207.25410.248.207.255
5310.248.208.0/2210.248.208.1 – 10.248.211.25410.248.211.255
5410.248.212.0/2210.248.212.1 – 10.248.215.25410.248.215.255
5510.248.216.0/2210.248.216.1 – 10.248.219.25410.248.219.255
5610.248.220.0/2210.248.220.1 – 10.248.223.25410.248.223.255
5710.248.224.0/2210.248.224.1 – 10.248.227.25410.248.227.255
5810.248.228.0/2210.248.228.1 – 10.248.231.25410.248.231.255
5910.248.232.0/2210.248.232.1 – 10.248.235.25410.248.235.255
6010.248.236.0/2210.248.236.1 – 10.248.239.25410.248.239.255
6110.248.240.0/2210.248.240.1 – 10.248.243.25410.248.243.255
6210.248.244.0/2210.248.244.1 – 10.248.247.25410.248.247.255
6310.248.248.0/2210.248.248.1 – 10.248.251.25410.248.251.255
6410.248.252.0/2210.248.252.1 – 10.248.255.25410.248.255.255
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 →