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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)10.51.192.0/18
network10.51.192.0/18
broadcast10.51.255.255
first host10.51.192.1
last host10.51.255.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.51.192.0/18
address00001010.00110011.11000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00110011.11000000.00000000
broadcast00001010.00110011.11111111.11111111
green = network part, grey = host part
hex0x0a33c000
decimal171163648
reverse dns0.192.51.10.in-addr.arpa
ipv4-mapped::ffff:a33:c000

/18 split into /24 · 64 subnets

close ×
#networkhost rangebroadcast
110.51.192.0/2410.51.192.1 – 10.51.192.25410.51.192.255
210.51.193.0/2410.51.193.1 – 10.51.193.25410.51.193.255
310.51.194.0/2410.51.194.1 – 10.51.194.25410.51.194.255
410.51.195.0/2410.51.195.1 – 10.51.195.25410.51.195.255
510.51.196.0/2410.51.196.1 – 10.51.196.25410.51.196.255
610.51.197.0/2410.51.197.1 – 10.51.197.25410.51.197.255
710.51.198.0/2410.51.198.1 – 10.51.198.25410.51.198.255
810.51.199.0/2410.51.199.1 – 10.51.199.25410.51.199.255
910.51.200.0/2410.51.200.1 – 10.51.200.25410.51.200.255
1010.51.201.0/2410.51.201.1 – 10.51.201.25410.51.201.255
1110.51.202.0/2410.51.202.1 – 10.51.202.25410.51.202.255
1210.51.203.0/2410.51.203.1 – 10.51.203.25410.51.203.255
1310.51.204.0/2410.51.204.1 – 10.51.204.25410.51.204.255
1410.51.205.0/2410.51.205.1 – 10.51.205.25410.51.205.255
1510.51.206.0/2410.51.206.1 – 10.51.206.25410.51.206.255
1610.51.207.0/2410.51.207.1 – 10.51.207.25410.51.207.255
1710.51.208.0/2410.51.208.1 – 10.51.208.25410.51.208.255
1810.51.209.0/2410.51.209.1 – 10.51.209.25410.51.209.255
1910.51.210.0/2410.51.210.1 – 10.51.210.25410.51.210.255
2010.51.211.0/2410.51.211.1 – 10.51.211.25410.51.211.255
2110.51.212.0/2410.51.212.1 – 10.51.212.25410.51.212.255
2210.51.213.0/2410.51.213.1 – 10.51.213.25410.51.213.255
2310.51.214.0/2410.51.214.1 – 10.51.214.25410.51.214.255
2410.51.215.0/2410.51.215.1 – 10.51.215.25410.51.215.255
2510.51.216.0/2410.51.216.1 – 10.51.216.25410.51.216.255
2610.51.217.0/2410.51.217.1 – 10.51.217.25410.51.217.255
2710.51.218.0/2410.51.218.1 – 10.51.218.25410.51.218.255
2810.51.219.0/2410.51.219.1 – 10.51.219.25410.51.219.255
2910.51.220.0/2410.51.220.1 – 10.51.220.25410.51.220.255
3010.51.221.0/2410.51.221.1 – 10.51.221.25410.51.221.255
3110.51.222.0/2410.51.222.1 – 10.51.222.25410.51.222.255
3210.51.223.0/2410.51.223.1 – 10.51.223.25410.51.223.255
3310.51.224.0/2410.51.224.1 – 10.51.224.25410.51.224.255
3410.51.225.0/2410.51.225.1 – 10.51.225.25410.51.225.255
3510.51.226.0/2410.51.226.1 – 10.51.226.25410.51.226.255
3610.51.227.0/2410.51.227.1 – 10.51.227.25410.51.227.255
3710.51.228.0/2410.51.228.1 – 10.51.228.25410.51.228.255
3810.51.229.0/2410.51.229.1 – 10.51.229.25410.51.229.255
3910.51.230.0/2410.51.230.1 – 10.51.230.25410.51.230.255
4010.51.231.0/2410.51.231.1 – 10.51.231.25410.51.231.255
4110.51.232.0/2410.51.232.1 – 10.51.232.25410.51.232.255
4210.51.233.0/2410.51.233.1 – 10.51.233.25410.51.233.255
4310.51.234.0/2410.51.234.1 – 10.51.234.25410.51.234.255
4410.51.235.0/2410.51.235.1 – 10.51.235.25410.51.235.255
4510.51.236.0/2410.51.236.1 – 10.51.236.25410.51.236.255
4610.51.237.0/2410.51.237.1 – 10.51.237.25410.51.237.255
4710.51.238.0/2410.51.238.1 – 10.51.238.25410.51.238.255
4810.51.239.0/2410.51.239.1 – 10.51.239.25410.51.239.255
4910.51.240.0/2410.51.240.1 – 10.51.240.25410.51.240.255
5010.51.241.0/2410.51.241.1 – 10.51.241.25410.51.241.255
5110.51.242.0/2410.51.242.1 – 10.51.242.25410.51.242.255
5210.51.243.0/2410.51.243.1 – 10.51.243.25410.51.243.255
5310.51.244.0/2410.51.244.1 – 10.51.244.25410.51.244.255
5410.51.245.0/2410.51.245.1 – 10.51.245.25410.51.245.255
5510.51.246.0/2410.51.246.1 – 10.51.246.25410.51.246.255
5610.51.247.0/2410.51.247.1 – 10.51.247.25410.51.247.255
5710.51.248.0/2410.51.248.1 – 10.51.248.25410.51.248.255
5810.51.249.0/2410.51.249.1 – 10.51.249.25410.51.249.255
5910.51.250.0/2410.51.250.1 – 10.51.250.25410.51.250.255
6010.51.251.0/2410.51.251.1 – 10.51.251.25410.51.251.255
6110.51.252.0/2410.51.252.1 – 10.51.252.25410.51.252.255
6210.51.253.0/2410.51.253.1 – 10.51.253.25410.51.253.255
6310.51.254.0/2410.51.254.1 – 10.51.254.25410.51.254.255
6410.51.255.0/2410.51.255.1 – 10.51.255.25410.51.255.255
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 →