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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)10.6.0.0/16
network10.6.0.0/16
broadcast10.6.255.255
first host10.6.0.1
last host10.6.255.254
subnet mask255.255.0.0
wildcard0.0.255.255
addresses65,536
usable hosts65,534
classA
ipcalc 10.6.0.0/16
address00001010.00000110.00000000.00000000
subnet mask11111111.11111111.00000000.00000000
network00001010.00000110.00000000.00000000
broadcast00001010.00000110.11111111.11111111
green = network part, grey = host part
hex0x0a060000
decimal168165376
reverse dns0.0.6.10.in-addr.arpa
ipv4-mapped::ffff:a06:0

/16 split into /22 · 64 subnets

close ×
#networkhost rangebroadcast
110.6.0.0/2210.6.0.1 – 10.6.3.25410.6.3.255
210.6.4.0/2210.6.4.1 – 10.6.7.25410.6.7.255
310.6.8.0/2210.6.8.1 – 10.6.11.25410.6.11.255
410.6.12.0/2210.6.12.1 – 10.6.15.25410.6.15.255
510.6.16.0/2210.6.16.1 – 10.6.19.25410.6.19.255
610.6.20.0/2210.6.20.1 – 10.6.23.25410.6.23.255
710.6.24.0/2210.6.24.1 – 10.6.27.25410.6.27.255
810.6.28.0/2210.6.28.1 – 10.6.31.25410.6.31.255
910.6.32.0/2210.6.32.1 – 10.6.35.25410.6.35.255
1010.6.36.0/2210.6.36.1 – 10.6.39.25410.6.39.255
1110.6.40.0/2210.6.40.1 – 10.6.43.25410.6.43.255
1210.6.44.0/2210.6.44.1 – 10.6.47.25410.6.47.255
1310.6.48.0/2210.6.48.1 – 10.6.51.25410.6.51.255
1410.6.52.0/2210.6.52.1 – 10.6.55.25410.6.55.255
1510.6.56.0/2210.6.56.1 – 10.6.59.25410.6.59.255
1610.6.60.0/2210.6.60.1 – 10.6.63.25410.6.63.255
1710.6.64.0/2210.6.64.1 – 10.6.67.25410.6.67.255
1810.6.68.0/2210.6.68.1 – 10.6.71.25410.6.71.255
1910.6.72.0/2210.6.72.1 – 10.6.75.25410.6.75.255
2010.6.76.0/2210.6.76.1 – 10.6.79.25410.6.79.255
2110.6.80.0/2210.6.80.1 – 10.6.83.25410.6.83.255
2210.6.84.0/2210.6.84.1 – 10.6.87.25410.6.87.255
2310.6.88.0/2210.6.88.1 – 10.6.91.25410.6.91.255
2410.6.92.0/2210.6.92.1 – 10.6.95.25410.6.95.255
2510.6.96.0/2210.6.96.1 – 10.6.99.25410.6.99.255
2610.6.100.0/2210.6.100.1 – 10.6.103.25410.6.103.255
2710.6.104.0/2210.6.104.1 – 10.6.107.25410.6.107.255
2810.6.108.0/2210.6.108.1 – 10.6.111.25410.6.111.255
2910.6.112.0/2210.6.112.1 – 10.6.115.25410.6.115.255
3010.6.116.0/2210.6.116.1 – 10.6.119.25410.6.119.255
3110.6.120.0/2210.6.120.1 – 10.6.123.25410.6.123.255
3210.6.124.0/2210.6.124.1 – 10.6.127.25410.6.127.255
3310.6.128.0/2210.6.128.1 – 10.6.131.25410.6.131.255
3410.6.132.0/2210.6.132.1 – 10.6.135.25410.6.135.255
3510.6.136.0/2210.6.136.1 – 10.6.139.25410.6.139.255
3610.6.140.0/2210.6.140.1 – 10.6.143.25410.6.143.255
3710.6.144.0/2210.6.144.1 – 10.6.147.25410.6.147.255
3810.6.148.0/2210.6.148.1 – 10.6.151.25410.6.151.255
3910.6.152.0/2210.6.152.1 – 10.6.155.25410.6.155.255
4010.6.156.0/2210.6.156.1 – 10.6.159.25410.6.159.255
4110.6.160.0/2210.6.160.1 – 10.6.163.25410.6.163.255
4210.6.164.0/2210.6.164.1 – 10.6.167.25410.6.167.255
4310.6.168.0/2210.6.168.1 – 10.6.171.25410.6.171.255
4410.6.172.0/2210.6.172.1 – 10.6.175.25410.6.175.255
4510.6.176.0/2210.6.176.1 – 10.6.179.25410.6.179.255
4610.6.180.0/2210.6.180.1 – 10.6.183.25410.6.183.255
4710.6.184.0/2210.6.184.1 – 10.6.187.25410.6.187.255
4810.6.188.0/2210.6.188.1 – 10.6.191.25410.6.191.255
4910.6.192.0/2210.6.192.1 – 10.6.195.25410.6.195.255
5010.6.196.0/2210.6.196.1 – 10.6.199.25410.6.199.255
5110.6.200.0/2210.6.200.1 – 10.6.203.25410.6.203.255
5210.6.204.0/2210.6.204.1 – 10.6.207.25410.6.207.255
5310.6.208.0/2210.6.208.1 – 10.6.211.25410.6.211.255
5410.6.212.0/2210.6.212.1 – 10.6.215.25410.6.215.255
5510.6.216.0/2210.6.216.1 – 10.6.219.25410.6.219.255
5610.6.220.0/2210.6.220.1 – 10.6.223.25410.6.223.255
5710.6.224.0/2210.6.224.1 – 10.6.227.25410.6.227.255
5810.6.228.0/2210.6.228.1 – 10.6.231.25410.6.231.255
5910.6.232.0/2210.6.232.1 – 10.6.235.25410.6.235.255
6010.6.236.0/2210.6.236.1 – 10.6.239.25410.6.239.255
6110.6.240.0/2210.6.240.1 – 10.6.243.25410.6.243.255
6210.6.244.0/2210.6.244.1 – 10.6.247.25410.6.247.255
6310.6.248.0/2210.6.248.1 – 10.6.251.25410.6.251.255
6410.6.252.0/2210.6.252.1 – 10.6.255.25410.6.255.255
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 →