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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)10.21.160.0/19
network10.21.160.0/19
broadcast10.21.191.255
first host10.21.160.1
last host10.21.191.254
subnet mask255.255.224.0
wildcard0.0.31.255
addresses8,192
usable hosts8,190
classA
ipcalc 10.21.160.0/19
address00001010.00010101.10100000.00000000
subnet mask11111111.11111111.11100000.00000000
network00001010.00010101.10100000.00000000
broadcast00001010.00010101.10111111.11111111
green = network part, grey = host part
hex0x0a15a000
decimal169189376
reverse dns0.160.21.10.in-addr.arpa
ipv4-mapped::ffff:a15:a000

/19 split into /25 · 64 subnets

close ×
#networkhost rangebroadcast
110.21.160.0/2510.21.160.1 – 10.21.160.12610.21.160.127
210.21.160.128/2510.21.160.129 – 10.21.160.25410.21.160.255
310.21.161.0/2510.21.161.1 – 10.21.161.12610.21.161.127
410.21.161.128/2510.21.161.129 – 10.21.161.25410.21.161.255
510.21.162.0/2510.21.162.1 – 10.21.162.12610.21.162.127
610.21.162.128/2510.21.162.129 – 10.21.162.25410.21.162.255
710.21.163.0/2510.21.163.1 – 10.21.163.12610.21.163.127
810.21.163.128/2510.21.163.129 – 10.21.163.25410.21.163.255
910.21.164.0/2510.21.164.1 – 10.21.164.12610.21.164.127
1010.21.164.128/2510.21.164.129 – 10.21.164.25410.21.164.255
1110.21.165.0/2510.21.165.1 – 10.21.165.12610.21.165.127
1210.21.165.128/2510.21.165.129 – 10.21.165.25410.21.165.255
1310.21.166.0/2510.21.166.1 – 10.21.166.12610.21.166.127
1410.21.166.128/2510.21.166.129 – 10.21.166.25410.21.166.255
1510.21.167.0/2510.21.167.1 – 10.21.167.12610.21.167.127
1610.21.167.128/2510.21.167.129 – 10.21.167.25410.21.167.255
1710.21.168.0/2510.21.168.1 – 10.21.168.12610.21.168.127
1810.21.168.128/2510.21.168.129 – 10.21.168.25410.21.168.255
1910.21.169.0/2510.21.169.1 – 10.21.169.12610.21.169.127
2010.21.169.128/2510.21.169.129 – 10.21.169.25410.21.169.255
2110.21.170.0/2510.21.170.1 – 10.21.170.12610.21.170.127
2210.21.170.128/2510.21.170.129 – 10.21.170.25410.21.170.255
2310.21.171.0/2510.21.171.1 – 10.21.171.12610.21.171.127
2410.21.171.128/2510.21.171.129 – 10.21.171.25410.21.171.255
2510.21.172.0/2510.21.172.1 – 10.21.172.12610.21.172.127
2610.21.172.128/2510.21.172.129 – 10.21.172.25410.21.172.255
2710.21.173.0/2510.21.173.1 – 10.21.173.12610.21.173.127
2810.21.173.128/2510.21.173.129 – 10.21.173.25410.21.173.255
2910.21.174.0/2510.21.174.1 – 10.21.174.12610.21.174.127
3010.21.174.128/2510.21.174.129 – 10.21.174.25410.21.174.255
3110.21.175.0/2510.21.175.1 – 10.21.175.12610.21.175.127
3210.21.175.128/2510.21.175.129 – 10.21.175.25410.21.175.255
3310.21.176.0/2510.21.176.1 – 10.21.176.12610.21.176.127
3410.21.176.128/2510.21.176.129 – 10.21.176.25410.21.176.255
3510.21.177.0/2510.21.177.1 – 10.21.177.12610.21.177.127
3610.21.177.128/2510.21.177.129 – 10.21.177.25410.21.177.255
3710.21.178.0/2510.21.178.1 – 10.21.178.12610.21.178.127
3810.21.178.128/2510.21.178.129 – 10.21.178.25410.21.178.255
3910.21.179.0/2510.21.179.1 – 10.21.179.12610.21.179.127
4010.21.179.128/2510.21.179.129 – 10.21.179.25410.21.179.255
4110.21.180.0/2510.21.180.1 – 10.21.180.12610.21.180.127
4210.21.180.128/2510.21.180.129 – 10.21.180.25410.21.180.255
4310.21.181.0/2510.21.181.1 – 10.21.181.12610.21.181.127
4410.21.181.128/2510.21.181.129 – 10.21.181.25410.21.181.255
4510.21.182.0/2510.21.182.1 – 10.21.182.12610.21.182.127
4610.21.182.128/2510.21.182.129 – 10.21.182.25410.21.182.255
4710.21.183.0/2510.21.183.1 – 10.21.183.12610.21.183.127
4810.21.183.128/2510.21.183.129 – 10.21.183.25410.21.183.255
4910.21.184.0/2510.21.184.1 – 10.21.184.12610.21.184.127
5010.21.184.128/2510.21.184.129 – 10.21.184.25410.21.184.255
5110.21.185.0/2510.21.185.1 – 10.21.185.12610.21.185.127
5210.21.185.128/2510.21.185.129 – 10.21.185.25410.21.185.255
5310.21.186.0/2510.21.186.1 – 10.21.186.12610.21.186.127
5410.21.186.128/2510.21.186.129 – 10.21.186.25410.21.186.255
5510.21.187.0/2510.21.187.1 – 10.21.187.12610.21.187.127
5610.21.187.128/2510.21.187.129 – 10.21.187.25410.21.187.255
5710.21.188.0/2510.21.188.1 – 10.21.188.12610.21.188.127
5810.21.188.128/2510.21.188.129 – 10.21.188.25410.21.188.255
5910.21.189.0/2510.21.189.1 – 10.21.189.12610.21.189.127
6010.21.189.128/2510.21.189.129 – 10.21.189.25410.21.189.255
6110.21.190.0/2510.21.190.1 – 10.21.190.12610.21.190.127
6210.21.190.128/2510.21.190.129 – 10.21.190.25410.21.190.255
6310.21.191.0/2510.21.191.1 – 10.21.191.12610.21.191.127
6410.21.191.128/2510.21.191.129 – 10.21.191.25410.21.191.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /19
/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-
/16255.255.0.065,53665,534-
/17255.255.128.032,76832,766-
/18255.255.192.016,38416,382-
/19255.255.224.08,1928,1901
/20255.255.240.04,0964,0942 split →
/21255.255.248.02,0482,0464 split →
/22255.255.252.01,0241,0228 split →
/23255.255.254.051251016 split →
/24255.255.255.025625432 split →
/25255.255.255.12812812664 split →
/26255.255.255.1926462128 split →
/27255.255.255.2243230256 split →
/28255.255.255.2401614512 split →
/29255.255.255.248861,024 split →
/30255.255.255.252422,048 split →
/31255.255.255.254224,096 split →
/32255.255.255.255118,192 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 →