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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)10.25.96.0/19
network10.25.96.0/19
broadcast10.25.127.255
first host10.25.96.1
last host10.25.127.254
subnet mask255.255.224.0
wildcard0.0.31.255
addresses8,192
usable hosts8,190
classA
ipcalc 10.25.96.0/19
address00001010.00011001.01100000.00000000
subnet mask11111111.11111111.11100000.00000000
network00001010.00011001.01100000.00000000
broadcast00001010.00011001.01111111.11111111
green = network part, grey = host part
hex0x0a196000
decimal169435136
reverse dns0.96.25.10.in-addr.arpa
ipv4-mapped::ffff:a19:6000

/19 split into /25 · 64 subnets

close ×
#networkhost rangebroadcast
110.25.96.0/2510.25.96.1 – 10.25.96.12610.25.96.127
210.25.96.128/2510.25.96.129 – 10.25.96.25410.25.96.255
310.25.97.0/2510.25.97.1 – 10.25.97.12610.25.97.127
410.25.97.128/2510.25.97.129 – 10.25.97.25410.25.97.255
510.25.98.0/2510.25.98.1 – 10.25.98.12610.25.98.127
610.25.98.128/2510.25.98.129 – 10.25.98.25410.25.98.255
710.25.99.0/2510.25.99.1 – 10.25.99.12610.25.99.127
810.25.99.128/2510.25.99.129 – 10.25.99.25410.25.99.255
910.25.100.0/2510.25.100.1 – 10.25.100.12610.25.100.127
1010.25.100.128/2510.25.100.129 – 10.25.100.25410.25.100.255
1110.25.101.0/2510.25.101.1 – 10.25.101.12610.25.101.127
1210.25.101.128/2510.25.101.129 – 10.25.101.25410.25.101.255
1310.25.102.0/2510.25.102.1 – 10.25.102.12610.25.102.127
1410.25.102.128/2510.25.102.129 – 10.25.102.25410.25.102.255
1510.25.103.0/2510.25.103.1 – 10.25.103.12610.25.103.127
1610.25.103.128/2510.25.103.129 – 10.25.103.25410.25.103.255
1710.25.104.0/2510.25.104.1 – 10.25.104.12610.25.104.127
1810.25.104.128/2510.25.104.129 – 10.25.104.25410.25.104.255
1910.25.105.0/2510.25.105.1 – 10.25.105.12610.25.105.127
2010.25.105.128/2510.25.105.129 – 10.25.105.25410.25.105.255
2110.25.106.0/2510.25.106.1 – 10.25.106.12610.25.106.127
2210.25.106.128/2510.25.106.129 – 10.25.106.25410.25.106.255
2310.25.107.0/2510.25.107.1 – 10.25.107.12610.25.107.127
2410.25.107.128/2510.25.107.129 – 10.25.107.25410.25.107.255
2510.25.108.0/2510.25.108.1 – 10.25.108.12610.25.108.127
2610.25.108.128/2510.25.108.129 – 10.25.108.25410.25.108.255
2710.25.109.0/2510.25.109.1 – 10.25.109.12610.25.109.127
2810.25.109.128/2510.25.109.129 – 10.25.109.25410.25.109.255
2910.25.110.0/2510.25.110.1 – 10.25.110.12610.25.110.127
3010.25.110.128/2510.25.110.129 – 10.25.110.25410.25.110.255
3110.25.111.0/2510.25.111.1 – 10.25.111.12610.25.111.127
3210.25.111.128/2510.25.111.129 – 10.25.111.25410.25.111.255
3310.25.112.0/2510.25.112.1 – 10.25.112.12610.25.112.127
3410.25.112.128/2510.25.112.129 – 10.25.112.25410.25.112.255
3510.25.113.0/2510.25.113.1 – 10.25.113.12610.25.113.127
3610.25.113.128/2510.25.113.129 – 10.25.113.25410.25.113.255
3710.25.114.0/2510.25.114.1 – 10.25.114.12610.25.114.127
3810.25.114.128/2510.25.114.129 – 10.25.114.25410.25.114.255
3910.25.115.0/2510.25.115.1 – 10.25.115.12610.25.115.127
4010.25.115.128/2510.25.115.129 – 10.25.115.25410.25.115.255
4110.25.116.0/2510.25.116.1 – 10.25.116.12610.25.116.127
4210.25.116.128/2510.25.116.129 – 10.25.116.25410.25.116.255
4310.25.117.0/2510.25.117.1 – 10.25.117.12610.25.117.127
4410.25.117.128/2510.25.117.129 – 10.25.117.25410.25.117.255
4510.25.118.0/2510.25.118.1 – 10.25.118.12610.25.118.127
4610.25.118.128/2510.25.118.129 – 10.25.118.25410.25.118.255
4710.25.119.0/2510.25.119.1 – 10.25.119.12610.25.119.127
4810.25.119.128/2510.25.119.129 – 10.25.119.25410.25.119.255
4910.25.120.0/2510.25.120.1 – 10.25.120.12610.25.120.127
5010.25.120.128/2510.25.120.129 – 10.25.120.25410.25.120.255
5110.25.121.0/2510.25.121.1 – 10.25.121.12610.25.121.127
5210.25.121.128/2510.25.121.129 – 10.25.121.25410.25.121.255
5310.25.122.0/2510.25.122.1 – 10.25.122.12610.25.122.127
5410.25.122.128/2510.25.122.129 – 10.25.122.25410.25.122.255
5510.25.123.0/2510.25.123.1 – 10.25.123.12610.25.123.127
5610.25.123.128/2510.25.123.129 – 10.25.123.25410.25.123.255
5710.25.124.0/2510.25.124.1 – 10.25.124.12610.25.124.127
5810.25.124.128/2510.25.124.129 – 10.25.124.25410.25.124.255
5910.25.125.0/2510.25.125.1 – 10.25.125.12610.25.125.127
6010.25.125.128/2510.25.125.129 – 10.25.125.25410.25.125.255
6110.25.126.0/2510.25.126.1 – 10.25.126.12610.25.126.127
6210.25.126.128/2510.25.126.129 – 10.25.126.25410.25.126.255
6310.25.127.0/2510.25.127.1 – 10.25.127.12610.25.127.127
6410.25.127.128/2510.25.127.129 – 10.25.127.25410.25.127.255
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 →