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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)10.245.0.0/16
network10.245.0.0/16
broadcast10.245.255.255
first host10.245.0.1
last host10.245.255.254
subnet mask255.255.0.0
wildcard0.0.255.255
addresses65,536
usable hosts65,534
classA
ipcalc 10.245.0.0/16
address00001010.11110101.00000000.00000000
subnet mask11111111.11111111.00000000.00000000
network00001010.11110101.00000000.00000000
broadcast00001010.11110101.11111111.11111111
green = network part, grey = host part
hex0x0af50000
decimal183828480
reverse dns0.0.245.10.in-addr.arpa
ipv4-mapped::ffff:af5:0

/16 split into /22 · 64 subnets

close ×
#networkhost rangebroadcast
110.245.0.0/2210.245.0.1 – 10.245.3.25410.245.3.255
210.245.4.0/2210.245.4.1 – 10.245.7.25410.245.7.255
310.245.8.0/2210.245.8.1 – 10.245.11.25410.245.11.255
410.245.12.0/2210.245.12.1 – 10.245.15.25410.245.15.255
510.245.16.0/2210.245.16.1 – 10.245.19.25410.245.19.255
610.245.20.0/2210.245.20.1 – 10.245.23.25410.245.23.255
710.245.24.0/2210.245.24.1 – 10.245.27.25410.245.27.255
810.245.28.0/2210.245.28.1 – 10.245.31.25410.245.31.255
910.245.32.0/2210.245.32.1 – 10.245.35.25410.245.35.255
1010.245.36.0/2210.245.36.1 – 10.245.39.25410.245.39.255
1110.245.40.0/2210.245.40.1 – 10.245.43.25410.245.43.255
1210.245.44.0/2210.245.44.1 – 10.245.47.25410.245.47.255
1310.245.48.0/2210.245.48.1 – 10.245.51.25410.245.51.255
1410.245.52.0/2210.245.52.1 – 10.245.55.25410.245.55.255
1510.245.56.0/2210.245.56.1 – 10.245.59.25410.245.59.255
1610.245.60.0/2210.245.60.1 – 10.245.63.25410.245.63.255
1710.245.64.0/2210.245.64.1 – 10.245.67.25410.245.67.255
1810.245.68.0/2210.245.68.1 – 10.245.71.25410.245.71.255
1910.245.72.0/2210.245.72.1 – 10.245.75.25410.245.75.255
2010.245.76.0/2210.245.76.1 – 10.245.79.25410.245.79.255
2110.245.80.0/2210.245.80.1 – 10.245.83.25410.245.83.255
2210.245.84.0/2210.245.84.1 – 10.245.87.25410.245.87.255
2310.245.88.0/2210.245.88.1 – 10.245.91.25410.245.91.255
2410.245.92.0/2210.245.92.1 – 10.245.95.25410.245.95.255
2510.245.96.0/2210.245.96.1 – 10.245.99.25410.245.99.255
2610.245.100.0/2210.245.100.1 – 10.245.103.25410.245.103.255
2710.245.104.0/2210.245.104.1 – 10.245.107.25410.245.107.255
2810.245.108.0/2210.245.108.1 – 10.245.111.25410.245.111.255
2910.245.112.0/2210.245.112.1 – 10.245.115.25410.245.115.255
3010.245.116.0/2210.245.116.1 – 10.245.119.25410.245.119.255
3110.245.120.0/2210.245.120.1 – 10.245.123.25410.245.123.255
3210.245.124.0/2210.245.124.1 – 10.245.127.25410.245.127.255
3310.245.128.0/2210.245.128.1 – 10.245.131.25410.245.131.255
3410.245.132.0/2210.245.132.1 – 10.245.135.25410.245.135.255
3510.245.136.0/2210.245.136.1 – 10.245.139.25410.245.139.255
3610.245.140.0/2210.245.140.1 – 10.245.143.25410.245.143.255
3710.245.144.0/2210.245.144.1 – 10.245.147.25410.245.147.255
3810.245.148.0/2210.245.148.1 – 10.245.151.25410.245.151.255
3910.245.152.0/2210.245.152.1 – 10.245.155.25410.245.155.255
4010.245.156.0/2210.245.156.1 – 10.245.159.25410.245.159.255
4110.245.160.0/2210.245.160.1 – 10.245.163.25410.245.163.255
4210.245.164.0/2210.245.164.1 – 10.245.167.25410.245.167.255
4310.245.168.0/2210.245.168.1 – 10.245.171.25410.245.171.255
4410.245.172.0/2210.245.172.1 – 10.245.175.25410.245.175.255
4510.245.176.0/2210.245.176.1 – 10.245.179.25410.245.179.255
4610.245.180.0/2210.245.180.1 – 10.245.183.25410.245.183.255
4710.245.184.0/2210.245.184.1 – 10.245.187.25410.245.187.255
4810.245.188.0/2210.245.188.1 – 10.245.191.25410.245.191.255
4910.245.192.0/2210.245.192.1 – 10.245.195.25410.245.195.255
5010.245.196.0/2210.245.196.1 – 10.245.199.25410.245.199.255
5110.245.200.0/2210.245.200.1 – 10.245.203.25410.245.203.255
5210.245.204.0/2210.245.204.1 – 10.245.207.25410.245.207.255
5310.245.208.0/2210.245.208.1 – 10.245.211.25410.245.211.255
5410.245.212.0/2210.245.212.1 – 10.245.215.25410.245.215.255
5510.245.216.0/2210.245.216.1 – 10.245.219.25410.245.219.255
5610.245.220.0/2210.245.220.1 – 10.245.223.25410.245.223.255
5710.245.224.0/2210.245.224.1 – 10.245.227.25410.245.227.255
5810.245.228.0/2210.245.228.1 – 10.245.231.25410.245.231.255
5910.245.232.0/2210.245.232.1 – 10.245.235.25410.245.235.255
6010.245.236.0/2210.245.236.1 – 10.245.239.25410.245.239.255
6110.245.240.0/2210.245.240.1 – 10.245.243.25410.245.243.255
6210.245.244.0/2210.245.244.1 – 10.245.247.25410.245.247.255
6310.245.248.0/2210.245.248.1 – 10.245.251.25410.245.251.255
6410.245.252.0/2210.245.252.1 – 10.245.255.25410.245.255.255
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 →