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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)10.247.0.0/16
network10.247.0.0/16
broadcast10.247.255.255
first host10.247.0.1
last host10.247.255.254
subnet mask255.255.0.0
wildcard0.0.255.255
addresses65,536
usable hosts65,534
classA
ipcalc 10.247.0.0/16
address00001010.11110111.00000000.00000000
subnet mask11111111.11111111.00000000.00000000
network00001010.11110111.00000000.00000000
broadcast00001010.11110111.11111111.11111111
green = network part, grey = host part
hex0x0af70000
decimal183959552
reverse dns0.0.247.10.in-addr.arpa
ipv4-mapped::ffff:af7:0

/16 split into /22 · 64 subnets

close ×
#networkhost rangebroadcast
110.247.0.0/2210.247.0.1 – 10.247.3.25410.247.3.255
210.247.4.0/2210.247.4.1 – 10.247.7.25410.247.7.255
310.247.8.0/2210.247.8.1 – 10.247.11.25410.247.11.255
410.247.12.0/2210.247.12.1 – 10.247.15.25410.247.15.255
510.247.16.0/2210.247.16.1 – 10.247.19.25410.247.19.255
610.247.20.0/2210.247.20.1 – 10.247.23.25410.247.23.255
710.247.24.0/2210.247.24.1 – 10.247.27.25410.247.27.255
810.247.28.0/2210.247.28.1 – 10.247.31.25410.247.31.255
910.247.32.0/2210.247.32.1 – 10.247.35.25410.247.35.255
1010.247.36.0/2210.247.36.1 – 10.247.39.25410.247.39.255
1110.247.40.0/2210.247.40.1 – 10.247.43.25410.247.43.255
1210.247.44.0/2210.247.44.1 – 10.247.47.25410.247.47.255
1310.247.48.0/2210.247.48.1 – 10.247.51.25410.247.51.255
1410.247.52.0/2210.247.52.1 – 10.247.55.25410.247.55.255
1510.247.56.0/2210.247.56.1 – 10.247.59.25410.247.59.255
1610.247.60.0/2210.247.60.1 – 10.247.63.25410.247.63.255
1710.247.64.0/2210.247.64.1 – 10.247.67.25410.247.67.255
1810.247.68.0/2210.247.68.1 – 10.247.71.25410.247.71.255
1910.247.72.0/2210.247.72.1 – 10.247.75.25410.247.75.255
2010.247.76.0/2210.247.76.1 – 10.247.79.25410.247.79.255
2110.247.80.0/2210.247.80.1 – 10.247.83.25410.247.83.255
2210.247.84.0/2210.247.84.1 – 10.247.87.25410.247.87.255
2310.247.88.0/2210.247.88.1 – 10.247.91.25410.247.91.255
2410.247.92.0/2210.247.92.1 – 10.247.95.25410.247.95.255
2510.247.96.0/2210.247.96.1 – 10.247.99.25410.247.99.255
2610.247.100.0/2210.247.100.1 – 10.247.103.25410.247.103.255
2710.247.104.0/2210.247.104.1 – 10.247.107.25410.247.107.255
2810.247.108.0/2210.247.108.1 – 10.247.111.25410.247.111.255
2910.247.112.0/2210.247.112.1 – 10.247.115.25410.247.115.255
3010.247.116.0/2210.247.116.1 – 10.247.119.25410.247.119.255
3110.247.120.0/2210.247.120.1 – 10.247.123.25410.247.123.255
3210.247.124.0/2210.247.124.1 – 10.247.127.25410.247.127.255
3310.247.128.0/2210.247.128.1 – 10.247.131.25410.247.131.255
3410.247.132.0/2210.247.132.1 – 10.247.135.25410.247.135.255
3510.247.136.0/2210.247.136.1 – 10.247.139.25410.247.139.255
3610.247.140.0/2210.247.140.1 – 10.247.143.25410.247.143.255
3710.247.144.0/2210.247.144.1 – 10.247.147.25410.247.147.255
3810.247.148.0/2210.247.148.1 – 10.247.151.25410.247.151.255
3910.247.152.0/2210.247.152.1 – 10.247.155.25410.247.155.255
4010.247.156.0/2210.247.156.1 – 10.247.159.25410.247.159.255
4110.247.160.0/2210.247.160.1 – 10.247.163.25410.247.163.255
4210.247.164.0/2210.247.164.1 – 10.247.167.25410.247.167.255
4310.247.168.0/2210.247.168.1 – 10.247.171.25410.247.171.255
4410.247.172.0/2210.247.172.1 – 10.247.175.25410.247.175.255
4510.247.176.0/2210.247.176.1 – 10.247.179.25410.247.179.255
4610.247.180.0/2210.247.180.1 – 10.247.183.25410.247.183.255
4710.247.184.0/2210.247.184.1 – 10.247.187.25410.247.187.255
4810.247.188.0/2210.247.188.1 – 10.247.191.25410.247.191.255
4910.247.192.0/2210.247.192.1 – 10.247.195.25410.247.195.255
5010.247.196.0/2210.247.196.1 – 10.247.199.25410.247.199.255
5110.247.200.0/2210.247.200.1 – 10.247.203.25410.247.203.255
5210.247.204.0/2210.247.204.1 – 10.247.207.25410.247.207.255
5310.247.208.0/2210.247.208.1 – 10.247.211.25410.247.211.255
5410.247.212.0/2210.247.212.1 – 10.247.215.25410.247.215.255
5510.247.216.0/2210.247.216.1 – 10.247.219.25410.247.219.255
5610.247.220.0/2210.247.220.1 – 10.247.223.25410.247.223.255
5710.247.224.0/2210.247.224.1 – 10.247.227.25410.247.227.255
5810.247.228.0/2210.247.228.1 – 10.247.231.25410.247.231.255
5910.247.232.0/2210.247.232.1 – 10.247.235.25410.247.235.255
6010.247.236.0/2210.247.236.1 – 10.247.239.25410.247.239.255
6110.247.240.0/2210.247.240.1 – 10.247.243.25410.247.243.255
6210.247.244.0/2210.247.244.1 – 10.247.247.25410.247.247.255
6310.247.248.0/2210.247.248.1 – 10.247.251.25410.247.251.255
6410.247.252.0/2210.247.252.1 – 10.247.255.25410.247.255.255
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 →