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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)10.72.192.0/18
network10.72.192.0/18
broadcast10.72.255.255
first host10.72.192.1
last host10.72.255.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.72.192.0/18
address00001010.01001000.11000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.01001000.11000000.00000000
broadcast00001010.01001000.11111111.11111111
green = network part, grey = host part
hex0x0a48c000
decimal172539904
reverse dns0.192.72.10.in-addr.arpa
ipv4-mapped::ffff:a48:c000

/18 split into /24 · 64 subnets

close ×
#networkhost rangebroadcast
110.72.192.0/2410.72.192.1 – 10.72.192.25410.72.192.255
210.72.193.0/2410.72.193.1 – 10.72.193.25410.72.193.255
310.72.194.0/2410.72.194.1 – 10.72.194.25410.72.194.255
410.72.195.0/2410.72.195.1 – 10.72.195.25410.72.195.255
510.72.196.0/2410.72.196.1 – 10.72.196.25410.72.196.255
610.72.197.0/2410.72.197.1 – 10.72.197.25410.72.197.255
710.72.198.0/2410.72.198.1 – 10.72.198.25410.72.198.255
810.72.199.0/2410.72.199.1 – 10.72.199.25410.72.199.255
910.72.200.0/2410.72.200.1 – 10.72.200.25410.72.200.255
1010.72.201.0/2410.72.201.1 – 10.72.201.25410.72.201.255
1110.72.202.0/2410.72.202.1 – 10.72.202.25410.72.202.255
1210.72.203.0/2410.72.203.1 – 10.72.203.25410.72.203.255
1310.72.204.0/2410.72.204.1 – 10.72.204.25410.72.204.255
1410.72.205.0/2410.72.205.1 – 10.72.205.25410.72.205.255
1510.72.206.0/2410.72.206.1 – 10.72.206.25410.72.206.255
1610.72.207.0/2410.72.207.1 – 10.72.207.25410.72.207.255
1710.72.208.0/2410.72.208.1 – 10.72.208.25410.72.208.255
1810.72.209.0/2410.72.209.1 – 10.72.209.25410.72.209.255
1910.72.210.0/2410.72.210.1 – 10.72.210.25410.72.210.255
2010.72.211.0/2410.72.211.1 – 10.72.211.25410.72.211.255
2110.72.212.0/2410.72.212.1 – 10.72.212.25410.72.212.255
2210.72.213.0/2410.72.213.1 – 10.72.213.25410.72.213.255
2310.72.214.0/2410.72.214.1 – 10.72.214.25410.72.214.255
2410.72.215.0/2410.72.215.1 – 10.72.215.25410.72.215.255
2510.72.216.0/2410.72.216.1 – 10.72.216.25410.72.216.255
2610.72.217.0/2410.72.217.1 – 10.72.217.25410.72.217.255
2710.72.218.0/2410.72.218.1 – 10.72.218.25410.72.218.255
2810.72.219.0/2410.72.219.1 – 10.72.219.25410.72.219.255
2910.72.220.0/2410.72.220.1 – 10.72.220.25410.72.220.255
3010.72.221.0/2410.72.221.1 – 10.72.221.25410.72.221.255
3110.72.222.0/2410.72.222.1 – 10.72.222.25410.72.222.255
3210.72.223.0/2410.72.223.1 – 10.72.223.25410.72.223.255
3310.72.224.0/2410.72.224.1 – 10.72.224.25410.72.224.255
3410.72.225.0/2410.72.225.1 – 10.72.225.25410.72.225.255
3510.72.226.0/2410.72.226.1 – 10.72.226.25410.72.226.255
3610.72.227.0/2410.72.227.1 – 10.72.227.25410.72.227.255
3710.72.228.0/2410.72.228.1 – 10.72.228.25410.72.228.255
3810.72.229.0/2410.72.229.1 – 10.72.229.25410.72.229.255
3910.72.230.0/2410.72.230.1 – 10.72.230.25410.72.230.255
4010.72.231.0/2410.72.231.1 – 10.72.231.25410.72.231.255
4110.72.232.0/2410.72.232.1 – 10.72.232.25410.72.232.255
4210.72.233.0/2410.72.233.1 – 10.72.233.25410.72.233.255
4310.72.234.0/2410.72.234.1 – 10.72.234.25410.72.234.255
4410.72.235.0/2410.72.235.1 – 10.72.235.25410.72.235.255
4510.72.236.0/2410.72.236.1 – 10.72.236.25410.72.236.255
4610.72.237.0/2410.72.237.1 – 10.72.237.25410.72.237.255
4710.72.238.0/2410.72.238.1 – 10.72.238.25410.72.238.255
4810.72.239.0/2410.72.239.1 – 10.72.239.25410.72.239.255
4910.72.240.0/2410.72.240.1 – 10.72.240.25410.72.240.255
5010.72.241.0/2410.72.241.1 – 10.72.241.25410.72.241.255
5110.72.242.0/2410.72.242.1 – 10.72.242.25410.72.242.255
5210.72.243.0/2410.72.243.1 – 10.72.243.25410.72.243.255
5310.72.244.0/2410.72.244.1 – 10.72.244.25410.72.244.255
5410.72.245.0/2410.72.245.1 – 10.72.245.25410.72.245.255
5510.72.246.0/2410.72.246.1 – 10.72.246.25410.72.246.255
5610.72.247.0/2410.72.247.1 – 10.72.247.25410.72.247.255
5710.72.248.0/2410.72.248.1 – 10.72.248.25410.72.248.255
5810.72.249.0/2410.72.249.1 – 10.72.249.25410.72.249.255
5910.72.250.0/2410.72.250.1 – 10.72.250.25410.72.250.255
6010.72.251.0/2410.72.251.1 – 10.72.251.25410.72.251.255
6110.72.252.0/2410.72.252.1 – 10.72.252.25410.72.252.255
6210.72.253.0/2410.72.253.1 – 10.72.253.25410.72.253.255
6310.72.254.0/2410.72.254.1 – 10.72.254.25410.72.254.255
6410.72.255.0/2410.72.255.1 – 10.72.255.25410.72.255.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /18
/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-
/18255.255.192.016,38416,3821
/19255.255.224.08,1928,1902 split →
/20255.255.240.04,0964,0944 split →
/21255.255.248.02,0482,0468 split →
/22255.255.252.01,0241,02216 split →
/23255.255.254.051251032 split →
/24255.255.255.025625464 split →
/25255.255.255.128128126128 split →
/26255.255.255.1926462256 split →
/27255.255.255.2243230512 split →
/28255.255.255.24016141,024 split →
/29255.255.255.248862,048 split →
/30255.255.255.252424,096 split →
/31255.255.255.254228,192 split →
/32255.255.255.2551116,384 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 →