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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)10.21.32.0/19
network10.21.32.0/19
broadcast10.21.63.255
first host10.21.32.1
last host10.21.63.254
subnet mask255.255.224.0
wildcard0.0.31.255
addresses8,192
usable hosts8,190
classA
ipcalc 10.21.32.0/19
address00001010.00010101.00100000.00000000
subnet mask11111111.11111111.11100000.00000000
network00001010.00010101.00100000.00000000
broadcast00001010.00010101.00111111.11111111
green = network part, grey = host part
hex0x0a152000
decimal169156608
reverse dns0.32.21.10.in-addr.arpa
ipv4-mapped::ffff:a15:2000

/19 split into /25 · 64 subnets

close ×
#networkhost rangebroadcast
110.21.32.0/2510.21.32.1 – 10.21.32.12610.21.32.127
210.21.32.128/2510.21.32.129 – 10.21.32.25410.21.32.255
310.21.33.0/2510.21.33.1 – 10.21.33.12610.21.33.127
410.21.33.128/2510.21.33.129 – 10.21.33.25410.21.33.255
510.21.34.0/2510.21.34.1 – 10.21.34.12610.21.34.127
610.21.34.128/2510.21.34.129 – 10.21.34.25410.21.34.255
710.21.35.0/2510.21.35.1 – 10.21.35.12610.21.35.127
810.21.35.128/2510.21.35.129 – 10.21.35.25410.21.35.255
910.21.36.0/2510.21.36.1 – 10.21.36.12610.21.36.127
1010.21.36.128/2510.21.36.129 – 10.21.36.25410.21.36.255
1110.21.37.0/2510.21.37.1 – 10.21.37.12610.21.37.127
1210.21.37.128/2510.21.37.129 – 10.21.37.25410.21.37.255
1310.21.38.0/2510.21.38.1 – 10.21.38.12610.21.38.127
1410.21.38.128/2510.21.38.129 – 10.21.38.25410.21.38.255
1510.21.39.0/2510.21.39.1 – 10.21.39.12610.21.39.127
1610.21.39.128/2510.21.39.129 – 10.21.39.25410.21.39.255
1710.21.40.0/2510.21.40.1 – 10.21.40.12610.21.40.127
1810.21.40.128/2510.21.40.129 – 10.21.40.25410.21.40.255
1910.21.41.0/2510.21.41.1 – 10.21.41.12610.21.41.127
2010.21.41.128/2510.21.41.129 – 10.21.41.25410.21.41.255
2110.21.42.0/2510.21.42.1 – 10.21.42.12610.21.42.127
2210.21.42.128/2510.21.42.129 – 10.21.42.25410.21.42.255
2310.21.43.0/2510.21.43.1 – 10.21.43.12610.21.43.127
2410.21.43.128/2510.21.43.129 – 10.21.43.25410.21.43.255
2510.21.44.0/2510.21.44.1 – 10.21.44.12610.21.44.127
2610.21.44.128/2510.21.44.129 – 10.21.44.25410.21.44.255
2710.21.45.0/2510.21.45.1 – 10.21.45.12610.21.45.127
2810.21.45.128/2510.21.45.129 – 10.21.45.25410.21.45.255
2910.21.46.0/2510.21.46.1 – 10.21.46.12610.21.46.127
3010.21.46.128/2510.21.46.129 – 10.21.46.25410.21.46.255
3110.21.47.0/2510.21.47.1 – 10.21.47.12610.21.47.127
3210.21.47.128/2510.21.47.129 – 10.21.47.25410.21.47.255
3310.21.48.0/2510.21.48.1 – 10.21.48.12610.21.48.127
3410.21.48.128/2510.21.48.129 – 10.21.48.25410.21.48.255
3510.21.49.0/2510.21.49.1 – 10.21.49.12610.21.49.127
3610.21.49.128/2510.21.49.129 – 10.21.49.25410.21.49.255
3710.21.50.0/2510.21.50.1 – 10.21.50.12610.21.50.127
3810.21.50.128/2510.21.50.129 – 10.21.50.25410.21.50.255
3910.21.51.0/2510.21.51.1 – 10.21.51.12610.21.51.127
4010.21.51.128/2510.21.51.129 – 10.21.51.25410.21.51.255
4110.21.52.0/2510.21.52.1 – 10.21.52.12610.21.52.127
4210.21.52.128/2510.21.52.129 – 10.21.52.25410.21.52.255
4310.21.53.0/2510.21.53.1 – 10.21.53.12610.21.53.127
4410.21.53.128/2510.21.53.129 – 10.21.53.25410.21.53.255
4510.21.54.0/2510.21.54.1 – 10.21.54.12610.21.54.127
4610.21.54.128/2510.21.54.129 – 10.21.54.25410.21.54.255
4710.21.55.0/2510.21.55.1 – 10.21.55.12610.21.55.127
4810.21.55.128/2510.21.55.129 – 10.21.55.25410.21.55.255
4910.21.56.0/2510.21.56.1 – 10.21.56.12610.21.56.127
5010.21.56.128/2510.21.56.129 – 10.21.56.25410.21.56.255
5110.21.57.0/2510.21.57.1 – 10.21.57.12610.21.57.127
5210.21.57.128/2510.21.57.129 – 10.21.57.25410.21.57.255
5310.21.58.0/2510.21.58.1 – 10.21.58.12610.21.58.127
5410.21.58.128/2510.21.58.129 – 10.21.58.25410.21.58.255
5510.21.59.0/2510.21.59.1 – 10.21.59.12610.21.59.127
5610.21.59.128/2510.21.59.129 – 10.21.59.25410.21.59.255
5710.21.60.0/2510.21.60.1 – 10.21.60.12610.21.60.127
5810.21.60.128/2510.21.60.129 – 10.21.60.25410.21.60.255
5910.21.61.0/2510.21.61.1 – 10.21.61.12610.21.61.127
6010.21.61.128/2510.21.61.129 – 10.21.61.25410.21.61.255
6110.21.62.0/2510.21.62.1 – 10.21.62.12610.21.62.127
6210.21.62.128/2510.21.62.129 – 10.21.62.25410.21.62.255
6310.21.63.0/2510.21.63.1 – 10.21.63.12610.21.63.127
6410.21.63.128/2510.21.63.129 – 10.21.63.25410.21.63.255
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 →