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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)10.205.0.0/16
network10.205.0.0/16
broadcast10.205.255.255
first host10.205.0.1
last host10.205.255.254
subnet mask255.255.0.0
wildcard0.0.255.255
addresses65,536
usable hosts65,534
classA
ipcalc 10.205.0.0/16
address00001010.11001101.00000000.00000000
subnet mask11111111.11111111.00000000.00000000
network00001010.11001101.00000000.00000000
broadcast00001010.11001101.11111111.11111111
green = network part, grey = host part
hex0x0acd0000
decimal181207040
reverse dns0.0.205.10.in-addr.arpa
ipv4-mapped::ffff:acd:0

/16 split into /22 · 64 subnets

close ×
#networkhost rangebroadcast
110.205.0.0/2210.205.0.1 – 10.205.3.25410.205.3.255
210.205.4.0/2210.205.4.1 – 10.205.7.25410.205.7.255
310.205.8.0/2210.205.8.1 – 10.205.11.25410.205.11.255
410.205.12.0/2210.205.12.1 – 10.205.15.25410.205.15.255
510.205.16.0/2210.205.16.1 – 10.205.19.25410.205.19.255
610.205.20.0/2210.205.20.1 – 10.205.23.25410.205.23.255
710.205.24.0/2210.205.24.1 – 10.205.27.25410.205.27.255
810.205.28.0/2210.205.28.1 – 10.205.31.25410.205.31.255
910.205.32.0/2210.205.32.1 – 10.205.35.25410.205.35.255
1010.205.36.0/2210.205.36.1 – 10.205.39.25410.205.39.255
1110.205.40.0/2210.205.40.1 – 10.205.43.25410.205.43.255
1210.205.44.0/2210.205.44.1 – 10.205.47.25410.205.47.255
1310.205.48.0/2210.205.48.1 – 10.205.51.25410.205.51.255
1410.205.52.0/2210.205.52.1 – 10.205.55.25410.205.55.255
1510.205.56.0/2210.205.56.1 – 10.205.59.25410.205.59.255
1610.205.60.0/2210.205.60.1 – 10.205.63.25410.205.63.255
1710.205.64.0/2210.205.64.1 – 10.205.67.25410.205.67.255
1810.205.68.0/2210.205.68.1 – 10.205.71.25410.205.71.255
1910.205.72.0/2210.205.72.1 – 10.205.75.25410.205.75.255
2010.205.76.0/2210.205.76.1 – 10.205.79.25410.205.79.255
2110.205.80.0/2210.205.80.1 – 10.205.83.25410.205.83.255
2210.205.84.0/2210.205.84.1 – 10.205.87.25410.205.87.255
2310.205.88.0/2210.205.88.1 – 10.205.91.25410.205.91.255
2410.205.92.0/2210.205.92.1 – 10.205.95.25410.205.95.255
2510.205.96.0/2210.205.96.1 – 10.205.99.25410.205.99.255
2610.205.100.0/2210.205.100.1 – 10.205.103.25410.205.103.255
2710.205.104.0/2210.205.104.1 – 10.205.107.25410.205.107.255
2810.205.108.0/2210.205.108.1 – 10.205.111.25410.205.111.255
2910.205.112.0/2210.205.112.1 – 10.205.115.25410.205.115.255
3010.205.116.0/2210.205.116.1 – 10.205.119.25410.205.119.255
3110.205.120.0/2210.205.120.1 – 10.205.123.25410.205.123.255
3210.205.124.0/2210.205.124.1 – 10.205.127.25410.205.127.255
3310.205.128.0/2210.205.128.1 – 10.205.131.25410.205.131.255
3410.205.132.0/2210.205.132.1 – 10.205.135.25410.205.135.255
3510.205.136.0/2210.205.136.1 – 10.205.139.25410.205.139.255
3610.205.140.0/2210.205.140.1 – 10.205.143.25410.205.143.255
3710.205.144.0/2210.205.144.1 – 10.205.147.25410.205.147.255
3810.205.148.0/2210.205.148.1 – 10.205.151.25410.205.151.255
3910.205.152.0/2210.205.152.1 – 10.205.155.25410.205.155.255
4010.205.156.0/2210.205.156.1 – 10.205.159.25410.205.159.255
4110.205.160.0/2210.205.160.1 – 10.205.163.25410.205.163.255
4210.205.164.0/2210.205.164.1 – 10.205.167.25410.205.167.255
4310.205.168.0/2210.205.168.1 – 10.205.171.25410.205.171.255
4410.205.172.0/2210.205.172.1 – 10.205.175.25410.205.175.255
4510.205.176.0/2210.205.176.1 – 10.205.179.25410.205.179.255
4610.205.180.0/2210.205.180.1 – 10.205.183.25410.205.183.255
4710.205.184.0/2210.205.184.1 – 10.205.187.25410.205.187.255
4810.205.188.0/2210.205.188.1 – 10.205.191.25410.205.191.255
4910.205.192.0/2210.205.192.1 – 10.205.195.25410.205.195.255
5010.205.196.0/2210.205.196.1 – 10.205.199.25410.205.199.255
5110.205.200.0/2210.205.200.1 – 10.205.203.25410.205.203.255
5210.205.204.0/2210.205.204.1 – 10.205.207.25410.205.207.255
5310.205.208.0/2210.205.208.1 – 10.205.211.25410.205.211.255
5410.205.212.0/2210.205.212.1 – 10.205.215.25410.205.215.255
5510.205.216.0/2210.205.216.1 – 10.205.219.25410.205.219.255
5610.205.220.0/2210.205.220.1 – 10.205.223.25410.205.223.255
5710.205.224.0/2210.205.224.1 – 10.205.227.25410.205.227.255
5810.205.228.0/2210.205.228.1 – 10.205.231.25410.205.231.255
5910.205.232.0/2210.205.232.1 – 10.205.235.25410.205.235.255
6010.205.236.0/2210.205.236.1 – 10.205.239.25410.205.239.255
6110.205.240.0/2210.205.240.1 – 10.205.243.25410.205.243.255
6210.205.244.0/2210.205.244.1 – 10.205.247.25410.205.247.255
6310.205.248.0/2210.205.248.1 – 10.205.251.25410.205.251.255
6410.205.252.0/2210.205.252.1 – 10.205.255.25410.205.255.255
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 →