ip
ipku.in

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)10.37.192.0/18
network10.37.192.0/18
broadcast10.37.255.255
first host10.37.192.1
last host10.37.255.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.37.192.0/18
address00001010.00100101.11000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00100101.11000000.00000000
broadcast00001010.00100101.11111111.11111111
green = network part, grey = host part
hex0x0a25c000
decimal170246144
reverse dns0.192.37.10.in-addr.arpa
ipv4-mapped::ffff:a25:c000

/18 split into /25 · 128 subnets

close ×
#networkhost rangebroadcast
110.37.192.0/2510.37.192.1 – 10.37.192.12610.37.192.127
210.37.192.128/2510.37.192.129 – 10.37.192.25410.37.192.255
310.37.193.0/2510.37.193.1 – 10.37.193.12610.37.193.127
410.37.193.128/2510.37.193.129 – 10.37.193.25410.37.193.255
510.37.194.0/2510.37.194.1 – 10.37.194.12610.37.194.127
610.37.194.128/2510.37.194.129 – 10.37.194.25410.37.194.255
710.37.195.0/2510.37.195.1 – 10.37.195.12610.37.195.127
810.37.195.128/2510.37.195.129 – 10.37.195.25410.37.195.255
910.37.196.0/2510.37.196.1 – 10.37.196.12610.37.196.127
1010.37.196.128/2510.37.196.129 – 10.37.196.25410.37.196.255
1110.37.197.0/2510.37.197.1 – 10.37.197.12610.37.197.127
1210.37.197.128/2510.37.197.129 – 10.37.197.25410.37.197.255
1310.37.198.0/2510.37.198.1 – 10.37.198.12610.37.198.127
1410.37.198.128/2510.37.198.129 – 10.37.198.25410.37.198.255
1510.37.199.0/2510.37.199.1 – 10.37.199.12610.37.199.127
1610.37.199.128/2510.37.199.129 – 10.37.199.25410.37.199.255
1710.37.200.0/2510.37.200.1 – 10.37.200.12610.37.200.127
1810.37.200.128/2510.37.200.129 – 10.37.200.25410.37.200.255
1910.37.201.0/2510.37.201.1 – 10.37.201.12610.37.201.127
2010.37.201.128/2510.37.201.129 – 10.37.201.25410.37.201.255
2110.37.202.0/2510.37.202.1 – 10.37.202.12610.37.202.127
2210.37.202.128/2510.37.202.129 – 10.37.202.25410.37.202.255
2310.37.203.0/2510.37.203.1 – 10.37.203.12610.37.203.127
2410.37.203.128/2510.37.203.129 – 10.37.203.25410.37.203.255
2510.37.204.0/2510.37.204.1 – 10.37.204.12610.37.204.127
2610.37.204.128/2510.37.204.129 – 10.37.204.25410.37.204.255
2710.37.205.0/2510.37.205.1 – 10.37.205.12610.37.205.127
2810.37.205.128/2510.37.205.129 – 10.37.205.25410.37.205.255
2910.37.206.0/2510.37.206.1 – 10.37.206.12610.37.206.127
3010.37.206.128/2510.37.206.129 – 10.37.206.25410.37.206.255
3110.37.207.0/2510.37.207.1 – 10.37.207.12610.37.207.127
3210.37.207.128/2510.37.207.129 – 10.37.207.25410.37.207.255
3310.37.208.0/2510.37.208.1 – 10.37.208.12610.37.208.127
3410.37.208.128/2510.37.208.129 – 10.37.208.25410.37.208.255
3510.37.209.0/2510.37.209.1 – 10.37.209.12610.37.209.127
3610.37.209.128/2510.37.209.129 – 10.37.209.25410.37.209.255
3710.37.210.0/2510.37.210.1 – 10.37.210.12610.37.210.127
3810.37.210.128/2510.37.210.129 – 10.37.210.25410.37.210.255
3910.37.211.0/2510.37.211.1 – 10.37.211.12610.37.211.127
4010.37.211.128/2510.37.211.129 – 10.37.211.25410.37.211.255
4110.37.212.0/2510.37.212.1 – 10.37.212.12610.37.212.127
4210.37.212.128/2510.37.212.129 – 10.37.212.25410.37.212.255
4310.37.213.0/2510.37.213.1 – 10.37.213.12610.37.213.127
4410.37.213.128/2510.37.213.129 – 10.37.213.25410.37.213.255
4510.37.214.0/2510.37.214.1 – 10.37.214.12610.37.214.127
4610.37.214.128/2510.37.214.129 – 10.37.214.25410.37.214.255
4710.37.215.0/2510.37.215.1 – 10.37.215.12610.37.215.127
4810.37.215.128/2510.37.215.129 – 10.37.215.25410.37.215.255
4910.37.216.0/2510.37.216.1 – 10.37.216.12610.37.216.127
5010.37.216.128/2510.37.216.129 – 10.37.216.25410.37.216.255
5110.37.217.0/2510.37.217.1 – 10.37.217.12610.37.217.127
5210.37.217.128/2510.37.217.129 – 10.37.217.25410.37.217.255
5310.37.218.0/2510.37.218.1 – 10.37.218.12610.37.218.127
5410.37.218.128/2510.37.218.129 – 10.37.218.25410.37.218.255
5510.37.219.0/2510.37.219.1 – 10.37.219.12610.37.219.127
5610.37.219.128/2510.37.219.129 – 10.37.219.25410.37.219.255
5710.37.220.0/2510.37.220.1 – 10.37.220.12610.37.220.127
5810.37.220.128/2510.37.220.129 – 10.37.220.25410.37.220.255
5910.37.221.0/2510.37.221.1 – 10.37.221.12610.37.221.127
6010.37.221.128/2510.37.221.129 – 10.37.221.25410.37.221.255
6110.37.222.0/2510.37.222.1 – 10.37.222.12610.37.222.127
6210.37.222.128/2510.37.222.129 – 10.37.222.25410.37.222.255
6310.37.223.0/2510.37.223.1 – 10.37.223.12610.37.223.127
6410.37.223.128/2510.37.223.129 – 10.37.223.25410.37.223.255
6510.37.224.0/2510.37.224.1 – 10.37.224.12610.37.224.127
6610.37.224.128/2510.37.224.129 – 10.37.224.25410.37.224.255
6710.37.225.0/2510.37.225.1 – 10.37.225.12610.37.225.127
6810.37.225.128/2510.37.225.129 – 10.37.225.25410.37.225.255
6910.37.226.0/2510.37.226.1 – 10.37.226.12610.37.226.127
7010.37.226.128/2510.37.226.129 – 10.37.226.25410.37.226.255
7110.37.227.0/2510.37.227.1 – 10.37.227.12610.37.227.127
7210.37.227.128/2510.37.227.129 – 10.37.227.25410.37.227.255
7310.37.228.0/2510.37.228.1 – 10.37.228.12610.37.228.127
7410.37.228.128/2510.37.228.129 – 10.37.228.25410.37.228.255
7510.37.229.0/2510.37.229.1 – 10.37.229.12610.37.229.127
7610.37.229.128/2510.37.229.129 – 10.37.229.25410.37.229.255
7710.37.230.0/2510.37.230.1 – 10.37.230.12610.37.230.127
7810.37.230.128/2510.37.230.129 – 10.37.230.25410.37.230.255
7910.37.231.0/2510.37.231.1 – 10.37.231.12610.37.231.127
8010.37.231.128/2510.37.231.129 – 10.37.231.25410.37.231.255
8110.37.232.0/2510.37.232.1 – 10.37.232.12610.37.232.127
8210.37.232.128/2510.37.232.129 – 10.37.232.25410.37.232.255
8310.37.233.0/2510.37.233.1 – 10.37.233.12610.37.233.127
8410.37.233.128/2510.37.233.129 – 10.37.233.25410.37.233.255
8510.37.234.0/2510.37.234.1 – 10.37.234.12610.37.234.127
8610.37.234.128/2510.37.234.129 – 10.37.234.25410.37.234.255
8710.37.235.0/2510.37.235.1 – 10.37.235.12610.37.235.127
8810.37.235.128/2510.37.235.129 – 10.37.235.25410.37.235.255
8910.37.236.0/2510.37.236.1 – 10.37.236.12610.37.236.127
9010.37.236.128/2510.37.236.129 – 10.37.236.25410.37.236.255
9110.37.237.0/2510.37.237.1 – 10.37.237.12610.37.237.127
9210.37.237.128/2510.37.237.129 – 10.37.237.25410.37.237.255
9310.37.238.0/2510.37.238.1 – 10.37.238.12610.37.238.127
9410.37.238.128/2510.37.238.129 – 10.37.238.25410.37.238.255
9510.37.239.0/2510.37.239.1 – 10.37.239.12610.37.239.127
9610.37.239.128/2510.37.239.129 – 10.37.239.25410.37.239.255
9710.37.240.0/2510.37.240.1 – 10.37.240.12610.37.240.127
9810.37.240.128/2510.37.240.129 – 10.37.240.25410.37.240.255
9910.37.241.0/2510.37.241.1 – 10.37.241.12610.37.241.127
10010.37.241.128/2510.37.241.129 – 10.37.241.25410.37.241.255
10110.37.242.0/2510.37.242.1 – 10.37.242.12610.37.242.127
10210.37.242.128/2510.37.242.129 – 10.37.242.25410.37.242.255
10310.37.243.0/2510.37.243.1 – 10.37.243.12610.37.243.127
10410.37.243.128/2510.37.243.129 – 10.37.243.25410.37.243.255
10510.37.244.0/2510.37.244.1 – 10.37.244.12610.37.244.127
10610.37.244.128/2510.37.244.129 – 10.37.244.25410.37.244.255
10710.37.245.0/2510.37.245.1 – 10.37.245.12610.37.245.127
10810.37.245.128/2510.37.245.129 – 10.37.245.25410.37.245.255
10910.37.246.0/2510.37.246.1 – 10.37.246.12610.37.246.127
11010.37.246.128/2510.37.246.129 – 10.37.246.25410.37.246.255
11110.37.247.0/2510.37.247.1 – 10.37.247.12610.37.247.127
11210.37.247.128/2510.37.247.129 – 10.37.247.25410.37.247.255
11310.37.248.0/2510.37.248.1 – 10.37.248.12610.37.248.127
11410.37.248.128/2510.37.248.129 – 10.37.248.25410.37.248.255
11510.37.249.0/2510.37.249.1 – 10.37.249.12610.37.249.127
11610.37.249.128/2510.37.249.129 – 10.37.249.25410.37.249.255
11710.37.250.0/2510.37.250.1 – 10.37.250.12610.37.250.127
11810.37.250.128/2510.37.250.129 – 10.37.250.25410.37.250.255
11910.37.251.0/2510.37.251.1 – 10.37.251.12610.37.251.127
12010.37.251.128/2510.37.251.129 – 10.37.251.25410.37.251.255
12110.37.252.0/2510.37.252.1 – 10.37.252.12610.37.252.127
12210.37.252.128/2510.37.252.129 – 10.37.252.25410.37.252.255
12310.37.253.0/2510.37.253.1 – 10.37.253.12610.37.253.127
12410.37.253.128/2510.37.253.129 – 10.37.253.25410.37.253.255
12510.37.254.0/2510.37.254.1 – 10.37.254.12610.37.254.127
12610.37.254.128/2510.37.254.129 – 10.37.254.25410.37.254.255
12710.37.255.0/2510.37.255.1 – 10.37.255.12610.37.255.127
12810.37.255.128/2510.37.255.129 – 10.37.255.25410.37.255.255
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 →