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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)10.1.192.0/19
network10.1.192.0/19
broadcast10.1.223.255
first host10.1.192.1
last host10.1.223.254
subnet mask255.255.224.0
wildcard0.0.31.255
addresses8,192
usable hosts8,190
classA
ipcalc 10.1.192.0/19
address00001010.00000001.11000000.00000000
subnet mask11111111.11111111.11100000.00000000
network00001010.00000001.11000000.00000000
broadcast00001010.00000001.11011111.11111111
green = network part, grey = host part
hex0x0a01c000
decimal167886848
reverse dns0.192.1.10.in-addr.arpa
ipv4-mapped::ffff:a01:c000

/19 split into /25 · 64 subnets

close ×
#networkhost rangebroadcast
110.1.192.0/2510.1.192.1 – 10.1.192.12610.1.192.127
210.1.192.128/2510.1.192.129 – 10.1.192.25410.1.192.255
310.1.193.0/2510.1.193.1 – 10.1.193.12610.1.193.127
410.1.193.128/2510.1.193.129 – 10.1.193.25410.1.193.255
510.1.194.0/2510.1.194.1 – 10.1.194.12610.1.194.127
610.1.194.128/2510.1.194.129 – 10.1.194.25410.1.194.255
710.1.195.0/2510.1.195.1 – 10.1.195.12610.1.195.127
810.1.195.128/2510.1.195.129 – 10.1.195.25410.1.195.255
910.1.196.0/2510.1.196.1 – 10.1.196.12610.1.196.127
1010.1.196.128/2510.1.196.129 – 10.1.196.25410.1.196.255
1110.1.197.0/2510.1.197.1 – 10.1.197.12610.1.197.127
1210.1.197.128/2510.1.197.129 – 10.1.197.25410.1.197.255
1310.1.198.0/2510.1.198.1 – 10.1.198.12610.1.198.127
1410.1.198.128/2510.1.198.129 – 10.1.198.25410.1.198.255
1510.1.199.0/2510.1.199.1 – 10.1.199.12610.1.199.127
1610.1.199.128/2510.1.199.129 – 10.1.199.25410.1.199.255
1710.1.200.0/2510.1.200.1 – 10.1.200.12610.1.200.127
1810.1.200.128/2510.1.200.129 – 10.1.200.25410.1.200.255
1910.1.201.0/2510.1.201.1 – 10.1.201.12610.1.201.127
2010.1.201.128/2510.1.201.129 – 10.1.201.25410.1.201.255
2110.1.202.0/2510.1.202.1 – 10.1.202.12610.1.202.127
2210.1.202.128/2510.1.202.129 – 10.1.202.25410.1.202.255
2310.1.203.0/2510.1.203.1 – 10.1.203.12610.1.203.127
2410.1.203.128/2510.1.203.129 – 10.1.203.25410.1.203.255
2510.1.204.0/2510.1.204.1 – 10.1.204.12610.1.204.127
2610.1.204.128/2510.1.204.129 – 10.1.204.25410.1.204.255
2710.1.205.0/2510.1.205.1 – 10.1.205.12610.1.205.127
2810.1.205.128/2510.1.205.129 – 10.1.205.25410.1.205.255
2910.1.206.0/2510.1.206.1 – 10.1.206.12610.1.206.127
3010.1.206.128/2510.1.206.129 – 10.1.206.25410.1.206.255
3110.1.207.0/2510.1.207.1 – 10.1.207.12610.1.207.127
3210.1.207.128/2510.1.207.129 – 10.1.207.25410.1.207.255
3310.1.208.0/2510.1.208.1 – 10.1.208.12610.1.208.127
3410.1.208.128/2510.1.208.129 – 10.1.208.25410.1.208.255
3510.1.209.0/2510.1.209.1 – 10.1.209.12610.1.209.127
3610.1.209.128/2510.1.209.129 – 10.1.209.25410.1.209.255
3710.1.210.0/2510.1.210.1 – 10.1.210.12610.1.210.127
3810.1.210.128/2510.1.210.129 – 10.1.210.25410.1.210.255
3910.1.211.0/2510.1.211.1 – 10.1.211.12610.1.211.127
4010.1.211.128/2510.1.211.129 – 10.1.211.25410.1.211.255
4110.1.212.0/2510.1.212.1 – 10.1.212.12610.1.212.127
4210.1.212.128/2510.1.212.129 – 10.1.212.25410.1.212.255
4310.1.213.0/2510.1.213.1 – 10.1.213.12610.1.213.127
4410.1.213.128/2510.1.213.129 – 10.1.213.25410.1.213.255
4510.1.214.0/2510.1.214.1 – 10.1.214.12610.1.214.127
4610.1.214.128/2510.1.214.129 – 10.1.214.25410.1.214.255
4710.1.215.0/2510.1.215.1 – 10.1.215.12610.1.215.127
4810.1.215.128/2510.1.215.129 – 10.1.215.25410.1.215.255
4910.1.216.0/2510.1.216.1 – 10.1.216.12610.1.216.127
5010.1.216.128/2510.1.216.129 – 10.1.216.25410.1.216.255
5110.1.217.0/2510.1.217.1 – 10.1.217.12610.1.217.127
5210.1.217.128/2510.1.217.129 – 10.1.217.25410.1.217.255
5310.1.218.0/2510.1.218.1 – 10.1.218.12610.1.218.127
5410.1.218.128/2510.1.218.129 – 10.1.218.25410.1.218.255
5510.1.219.0/2510.1.219.1 – 10.1.219.12610.1.219.127
5610.1.219.128/2510.1.219.129 – 10.1.219.25410.1.219.255
5710.1.220.0/2510.1.220.1 – 10.1.220.12610.1.220.127
5810.1.220.128/2510.1.220.129 – 10.1.220.25410.1.220.255
5910.1.221.0/2510.1.221.1 – 10.1.221.12610.1.221.127
6010.1.221.128/2510.1.221.129 – 10.1.221.25410.1.221.255
6110.1.222.0/2510.1.222.1 – 10.1.222.12610.1.222.127
6210.1.222.128/2510.1.222.129 – 10.1.222.25410.1.222.255
6310.1.223.0/2510.1.223.1 – 10.1.223.12610.1.223.127
6410.1.223.128/2510.1.223.129 – 10.1.223.25410.1.223.255
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 →