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
private IP (RFC 1918)10.15.192.0/18
network10.15.192.0/18
broadcast10.15.255.255
first host10.15.192.1
last host10.15.255.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.15.192.0/18
address00001010.00001111.11000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00001111.11000000.00000000
broadcast00001010.00001111.11111111.11111111
green = network part, grey = host part
hex0x0a0fc000
decimal168804352
reverse dns0.192.15.10.in-addr.arpa
ipv4-mapped::ffff:a0f:c000

/18 split into /25 · 128 subnets

close ×
#networkhost rangebroadcast
110.15.192.0/2510.15.192.1 – 10.15.192.12610.15.192.127
210.15.192.128/2510.15.192.129 – 10.15.192.25410.15.192.255
310.15.193.0/2510.15.193.1 – 10.15.193.12610.15.193.127
410.15.193.128/2510.15.193.129 – 10.15.193.25410.15.193.255
510.15.194.0/2510.15.194.1 – 10.15.194.12610.15.194.127
610.15.194.128/2510.15.194.129 – 10.15.194.25410.15.194.255
710.15.195.0/2510.15.195.1 – 10.15.195.12610.15.195.127
810.15.195.128/2510.15.195.129 – 10.15.195.25410.15.195.255
910.15.196.0/2510.15.196.1 – 10.15.196.12610.15.196.127
1010.15.196.128/2510.15.196.129 – 10.15.196.25410.15.196.255
1110.15.197.0/2510.15.197.1 – 10.15.197.12610.15.197.127
1210.15.197.128/2510.15.197.129 – 10.15.197.25410.15.197.255
1310.15.198.0/2510.15.198.1 – 10.15.198.12610.15.198.127
1410.15.198.128/2510.15.198.129 – 10.15.198.25410.15.198.255
1510.15.199.0/2510.15.199.1 – 10.15.199.12610.15.199.127
1610.15.199.128/2510.15.199.129 – 10.15.199.25410.15.199.255
1710.15.200.0/2510.15.200.1 – 10.15.200.12610.15.200.127
1810.15.200.128/2510.15.200.129 – 10.15.200.25410.15.200.255
1910.15.201.0/2510.15.201.1 – 10.15.201.12610.15.201.127
2010.15.201.128/2510.15.201.129 – 10.15.201.25410.15.201.255
2110.15.202.0/2510.15.202.1 – 10.15.202.12610.15.202.127
2210.15.202.128/2510.15.202.129 – 10.15.202.25410.15.202.255
2310.15.203.0/2510.15.203.1 – 10.15.203.12610.15.203.127
2410.15.203.128/2510.15.203.129 – 10.15.203.25410.15.203.255
2510.15.204.0/2510.15.204.1 – 10.15.204.12610.15.204.127
2610.15.204.128/2510.15.204.129 – 10.15.204.25410.15.204.255
2710.15.205.0/2510.15.205.1 – 10.15.205.12610.15.205.127
2810.15.205.128/2510.15.205.129 – 10.15.205.25410.15.205.255
2910.15.206.0/2510.15.206.1 – 10.15.206.12610.15.206.127
3010.15.206.128/2510.15.206.129 – 10.15.206.25410.15.206.255
3110.15.207.0/2510.15.207.1 – 10.15.207.12610.15.207.127
3210.15.207.128/2510.15.207.129 – 10.15.207.25410.15.207.255
3310.15.208.0/2510.15.208.1 – 10.15.208.12610.15.208.127
3410.15.208.128/2510.15.208.129 – 10.15.208.25410.15.208.255
3510.15.209.0/2510.15.209.1 – 10.15.209.12610.15.209.127
3610.15.209.128/2510.15.209.129 – 10.15.209.25410.15.209.255
3710.15.210.0/2510.15.210.1 – 10.15.210.12610.15.210.127
3810.15.210.128/2510.15.210.129 – 10.15.210.25410.15.210.255
3910.15.211.0/2510.15.211.1 – 10.15.211.12610.15.211.127
4010.15.211.128/2510.15.211.129 – 10.15.211.25410.15.211.255
4110.15.212.0/2510.15.212.1 – 10.15.212.12610.15.212.127
4210.15.212.128/2510.15.212.129 – 10.15.212.25410.15.212.255
4310.15.213.0/2510.15.213.1 – 10.15.213.12610.15.213.127
4410.15.213.128/2510.15.213.129 – 10.15.213.25410.15.213.255
4510.15.214.0/2510.15.214.1 – 10.15.214.12610.15.214.127
4610.15.214.128/2510.15.214.129 – 10.15.214.25410.15.214.255
4710.15.215.0/2510.15.215.1 – 10.15.215.12610.15.215.127
4810.15.215.128/2510.15.215.129 – 10.15.215.25410.15.215.255
4910.15.216.0/2510.15.216.1 – 10.15.216.12610.15.216.127
5010.15.216.128/2510.15.216.129 – 10.15.216.25410.15.216.255
5110.15.217.0/2510.15.217.1 – 10.15.217.12610.15.217.127
5210.15.217.128/2510.15.217.129 – 10.15.217.25410.15.217.255
5310.15.218.0/2510.15.218.1 – 10.15.218.12610.15.218.127
5410.15.218.128/2510.15.218.129 – 10.15.218.25410.15.218.255
5510.15.219.0/2510.15.219.1 – 10.15.219.12610.15.219.127
5610.15.219.128/2510.15.219.129 – 10.15.219.25410.15.219.255
5710.15.220.0/2510.15.220.1 – 10.15.220.12610.15.220.127
5810.15.220.128/2510.15.220.129 – 10.15.220.25410.15.220.255
5910.15.221.0/2510.15.221.1 – 10.15.221.12610.15.221.127
6010.15.221.128/2510.15.221.129 – 10.15.221.25410.15.221.255
6110.15.222.0/2510.15.222.1 – 10.15.222.12610.15.222.127
6210.15.222.128/2510.15.222.129 – 10.15.222.25410.15.222.255
6310.15.223.0/2510.15.223.1 – 10.15.223.12610.15.223.127
6410.15.223.128/2510.15.223.129 – 10.15.223.25410.15.223.255
6510.15.224.0/2510.15.224.1 – 10.15.224.12610.15.224.127
6610.15.224.128/2510.15.224.129 – 10.15.224.25410.15.224.255
6710.15.225.0/2510.15.225.1 – 10.15.225.12610.15.225.127
6810.15.225.128/2510.15.225.129 – 10.15.225.25410.15.225.255
6910.15.226.0/2510.15.226.1 – 10.15.226.12610.15.226.127
7010.15.226.128/2510.15.226.129 – 10.15.226.25410.15.226.255
7110.15.227.0/2510.15.227.1 – 10.15.227.12610.15.227.127
7210.15.227.128/2510.15.227.129 – 10.15.227.25410.15.227.255
7310.15.228.0/2510.15.228.1 – 10.15.228.12610.15.228.127
7410.15.228.128/2510.15.228.129 – 10.15.228.25410.15.228.255
7510.15.229.0/2510.15.229.1 – 10.15.229.12610.15.229.127
7610.15.229.128/2510.15.229.129 – 10.15.229.25410.15.229.255
7710.15.230.0/2510.15.230.1 – 10.15.230.12610.15.230.127
7810.15.230.128/2510.15.230.129 – 10.15.230.25410.15.230.255
7910.15.231.0/2510.15.231.1 – 10.15.231.12610.15.231.127
8010.15.231.128/2510.15.231.129 – 10.15.231.25410.15.231.255
8110.15.232.0/2510.15.232.1 – 10.15.232.12610.15.232.127
8210.15.232.128/2510.15.232.129 – 10.15.232.25410.15.232.255
8310.15.233.0/2510.15.233.1 – 10.15.233.12610.15.233.127
8410.15.233.128/2510.15.233.129 – 10.15.233.25410.15.233.255
8510.15.234.0/2510.15.234.1 – 10.15.234.12610.15.234.127
8610.15.234.128/2510.15.234.129 – 10.15.234.25410.15.234.255
8710.15.235.0/2510.15.235.1 – 10.15.235.12610.15.235.127
8810.15.235.128/2510.15.235.129 – 10.15.235.25410.15.235.255
8910.15.236.0/2510.15.236.1 – 10.15.236.12610.15.236.127
9010.15.236.128/2510.15.236.129 – 10.15.236.25410.15.236.255
9110.15.237.0/2510.15.237.1 – 10.15.237.12610.15.237.127
9210.15.237.128/2510.15.237.129 – 10.15.237.25410.15.237.255
9310.15.238.0/2510.15.238.1 – 10.15.238.12610.15.238.127
9410.15.238.128/2510.15.238.129 – 10.15.238.25410.15.238.255
9510.15.239.0/2510.15.239.1 – 10.15.239.12610.15.239.127
9610.15.239.128/2510.15.239.129 – 10.15.239.25410.15.239.255
9710.15.240.0/2510.15.240.1 – 10.15.240.12610.15.240.127
9810.15.240.128/2510.15.240.129 – 10.15.240.25410.15.240.255
9910.15.241.0/2510.15.241.1 – 10.15.241.12610.15.241.127
10010.15.241.128/2510.15.241.129 – 10.15.241.25410.15.241.255
10110.15.242.0/2510.15.242.1 – 10.15.242.12610.15.242.127
10210.15.242.128/2510.15.242.129 – 10.15.242.25410.15.242.255
10310.15.243.0/2510.15.243.1 – 10.15.243.12610.15.243.127
10410.15.243.128/2510.15.243.129 – 10.15.243.25410.15.243.255
10510.15.244.0/2510.15.244.1 – 10.15.244.12610.15.244.127
10610.15.244.128/2510.15.244.129 – 10.15.244.25410.15.244.255
10710.15.245.0/2510.15.245.1 – 10.15.245.12610.15.245.127
10810.15.245.128/2510.15.245.129 – 10.15.245.25410.15.245.255
10910.15.246.0/2510.15.246.1 – 10.15.246.12610.15.246.127
11010.15.246.128/2510.15.246.129 – 10.15.246.25410.15.246.255
11110.15.247.0/2510.15.247.1 – 10.15.247.12610.15.247.127
11210.15.247.128/2510.15.247.129 – 10.15.247.25410.15.247.255
11310.15.248.0/2510.15.248.1 – 10.15.248.12610.15.248.127
11410.15.248.128/2510.15.248.129 – 10.15.248.25410.15.248.255
11510.15.249.0/2510.15.249.1 – 10.15.249.12610.15.249.127
11610.15.249.128/2510.15.249.129 – 10.15.249.25410.15.249.255
11710.15.250.0/2510.15.250.1 – 10.15.250.12610.15.250.127
11810.15.250.128/2510.15.250.129 – 10.15.250.25410.15.250.255
11910.15.251.0/2510.15.251.1 – 10.15.251.12610.15.251.127
12010.15.251.128/2510.15.251.129 – 10.15.251.25410.15.251.255
12110.15.252.0/2510.15.252.1 – 10.15.252.12610.15.252.127
12210.15.252.128/2510.15.252.129 – 10.15.252.25410.15.252.255
12310.15.253.0/2510.15.253.1 – 10.15.253.12610.15.253.127
12410.15.253.128/2510.15.253.129 – 10.15.253.25410.15.253.255
12510.15.254.0/2510.15.254.1 – 10.15.254.12610.15.254.127
12610.15.254.128/2510.15.254.129 – 10.15.254.25410.15.254.255
12710.15.255.0/2510.15.255.1 – 10.15.255.12610.15.255.127
12810.15.255.128/2510.15.255.129 – 10.15.255.25410.15.255.255
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 →