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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)10.1.224.0/19
network10.1.224.0/19
broadcast10.1.255.255
first host10.1.224.1
last host10.1.255.254
subnet mask255.255.224.0
wildcard0.0.31.255
addresses8,192
usable hosts8,190
classA
ipcalc 10.1.224.0/19
address00001010.00000001.11100000.00000000
subnet mask11111111.11111111.11100000.00000000
network00001010.00000001.11100000.00000000
broadcast00001010.00000001.11111111.11111111
green = network part, grey = host part
hex0x0a01e000
decimal167895040
reverse dns0.224.1.10.in-addr.arpa
ipv4-mapped::ffff:a01:e000

/19 split into /25 · 64 subnets

close ×
#networkhost rangebroadcast
110.1.224.0/2510.1.224.1 – 10.1.224.12610.1.224.127
210.1.224.128/2510.1.224.129 – 10.1.224.25410.1.224.255
310.1.225.0/2510.1.225.1 – 10.1.225.12610.1.225.127
410.1.225.128/2510.1.225.129 – 10.1.225.25410.1.225.255
510.1.226.0/2510.1.226.1 – 10.1.226.12610.1.226.127
610.1.226.128/2510.1.226.129 – 10.1.226.25410.1.226.255
710.1.227.0/2510.1.227.1 – 10.1.227.12610.1.227.127
810.1.227.128/2510.1.227.129 – 10.1.227.25410.1.227.255
910.1.228.0/2510.1.228.1 – 10.1.228.12610.1.228.127
1010.1.228.128/2510.1.228.129 – 10.1.228.25410.1.228.255
1110.1.229.0/2510.1.229.1 – 10.1.229.12610.1.229.127
1210.1.229.128/2510.1.229.129 – 10.1.229.25410.1.229.255
1310.1.230.0/2510.1.230.1 – 10.1.230.12610.1.230.127
1410.1.230.128/2510.1.230.129 – 10.1.230.25410.1.230.255
1510.1.231.0/2510.1.231.1 – 10.1.231.12610.1.231.127
1610.1.231.128/2510.1.231.129 – 10.1.231.25410.1.231.255
1710.1.232.0/2510.1.232.1 – 10.1.232.12610.1.232.127
1810.1.232.128/2510.1.232.129 – 10.1.232.25410.1.232.255
1910.1.233.0/2510.1.233.1 – 10.1.233.12610.1.233.127
2010.1.233.128/2510.1.233.129 – 10.1.233.25410.1.233.255
2110.1.234.0/2510.1.234.1 – 10.1.234.12610.1.234.127
2210.1.234.128/2510.1.234.129 – 10.1.234.25410.1.234.255
2310.1.235.0/2510.1.235.1 – 10.1.235.12610.1.235.127
2410.1.235.128/2510.1.235.129 – 10.1.235.25410.1.235.255
2510.1.236.0/2510.1.236.1 – 10.1.236.12610.1.236.127
2610.1.236.128/2510.1.236.129 – 10.1.236.25410.1.236.255
2710.1.237.0/2510.1.237.1 – 10.1.237.12610.1.237.127
2810.1.237.128/2510.1.237.129 – 10.1.237.25410.1.237.255
2910.1.238.0/2510.1.238.1 – 10.1.238.12610.1.238.127
3010.1.238.128/2510.1.238.129 – 10.1.238.25410.1.238.255
3110.1.239.0/2510.1.239.1 – 10.1.239.12610.1.239.127
3210.1.239.128/2510.1.239.129 – 10.1.239.25410.1.239.255
3310.1.240.0/2510.1.240.1 – 10.1.240.12610.1.240.127
3410.1.240.128/2510.1.240.129 – 10.1.240.25410.1.240.255
3510.1.241.0/2510.1.241.1 – 10.1.241.12610.1.241.127
3610.1.241.128/2510.1.241.129 – 10.1.241.25410.1.241.255
3710.1.242.0/2510.1.242.1 – 10.1.242.12610.1.242.127
3810.1.242.128/2510.1.242.129 – 10.1.242.25410.1.242.255
3910.1.243.0/2510.1.243.1 – 10.1.243.12610.1.243.127
4010.1.243.128/2510.1.243.129 – 10.1.243.25410.1.243.255
4110.1.244.0/2510.1.244.1 – 10.1.244.12610.1.244.127
4210.1.244.128/2510.1.244.129 – 10.1.244.25410.1.244.255
4310.1.245.0/2510.1.245.1 – 10.1.245.12610.1.245.127
4410.1.245.128/2510.1.245.129 – 10.1.245.25410.1.245.255
4510.1.246.0/2510.1.246.1 – 10.1.246.12610.1.246.127
4610.1.246.128/2510.1.246.129 – 10.1.246.25410.1.246.255
4710.1.247.0/2510.1.247.1 – 10.1.247.12610.1.247.127
4810.1.247.128/2510.1.247.129 – 10.1.247.25410.1.247.255
4910.1.248.0/2510.1.248.1 – 10.1.248.12610.1.248.127
5010.1.248.128/2510.1.248.129 – 10.1.248.25410.1.248.255
5110.1.249.0/2510.1.249.1 – 10.1.249.12610.1.249.127
5210.1.249.128/2510.1.249.129 – 10.1.249.25410.1.249.255
5310.1.250.0/2510.1.250.1 – 10.1.250.12610.1.250.127
5410.1.250.128/2510.1.250.129 – 10.1.250.25410.1.250.255
5510.1.251.0/2510.1.251.1 – 10.1.251.12610.1.251.127
5610.1.251.128/2510.1.251.129 – 10.1.251.25410.1.251.255
5710.1.252.0/2510.1.252.1 – 10.1.252.12610.1.252.127
5810.1.252.128/2510.1.252.129 – 10.1.252.25410.1.252.255
5910.1.253.0/2510.1.253.1 – 10.1.253.12610.1.253.127
6010.1.253.128/2510.1.253.129 – 10.1.253.25410.1.253.255
6110.1.254.0/2510.1.254.1 – 10.1.254.12610.1.254.127
6210.1.254.128/2510.1.254.129 – 10.1.254.25410.1.254.255
6310.1.255.0/2510.1.255.1 – 10.1.255.12610.1.255.127
6410.1.255.128/2510.1.255.129 – 10.1.255.25410.1.255.255
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 →