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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)10.12.0.0/15
network10.12.0.0/15
broadcast10.13.255.255
first host10.12.0.1
last host10.13.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.12.0.0/15
address00001010.00001100.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.00001100.00000000.00000000
broadcast00001010.00001101.11111111.11111111
green = network part, grey = host part
hex0x0a0c0000
decimal168558592
reverse dns0.0.12.10.in-addr.arpa
ipv4-mapped::ffff:a0c:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.12.0.0/2110.12.0.1 – 10.12.7.25410.12.7.255
210.12.8.0/2110.12.8.1 – 10.12.15.25410.12.15.255
310.12.16.0/2110.12.16.1 – 10.12.23.25410.12.23.255
410.12.24.0/2110.12.24.1 – 10.12.31.25410.12.31.255
510.12.32.0/2110.12.32.1 – 10.12.39.25410.12.39.255
610.12.40.0/2110.12.40.1 – 10.12.47.25410.12.47.255
710.12.48.0/2110.12.48.1 – 10.12.55.25410.12.55.255
810.12.56.0/2110.12.56.1 – 10.12.63.25410.12.63.255
910.12.64.0/2110.12.64.1 – 10.12.71.25410.12.71.255
1010.12.72.0/2110.12.72.1 – 10.12.79.25410.12.79.255
1110.12.80.0/2110.12.80.1 – 10.12.87.25410.12.87.255
1210.12.88.0/2110.12.88.1 – 10.12.95.25410.12.95.255
1310.12.96.0/2110.12.96.1 – 10.12.103.25410.12.103.255
1410.12.104.0/2110.12.104.1 – 10.12.111.25410.12.111.255
1510.12.112.0/2110.12.112.1 – 10.12.119.25410.12.119.255
1610.12.120.0/2110.12.120.1 – 10.12.127.25410.12.127.255
1710.12.128.0/2110.12.128.1 – 10.12.135.25410.12.135.255
1810.12.136.0/2110.12.136.1 – 10.12.143.25410.12.143.255
1910.12.144.0/2110.12.144.1 – 10.12.151.25410.12.151.255
2010.12.152.0/2110.12.152.1 – 10.12.159.25410.12.159.255
2110.12.160.0/2110.12.160.1 – 10.12.167.25410.12.167.255
2210.12.168.0/2110.12.168.1 – 10.12.175.25410.12.175.255
2310.12.176.0/2110.12.176.1 – 10.12.183.25410.12.183.255
2410.12.184.0/2110.12.184.1 – 10.12.191.25410.12.191.255
2510.12.192.0/2110.12.192.1 – 10.12.199.25410.12.199.255
2610.12.200.0/2110.12.200.1 – 10.12.207.25410.12.207.255
2710.12.208.0/2110.12.208.1 – 10.12.215.25410.12.215.255
2810.12.216.0/2110.12.216.1 – 10.12.223.25410.12.223.255
2910.12.224.0/2110.12.224.1 – 10.12.231.25410.12.231.255
3010.12.232.0/2110.12.232.1 – 10.12.239.25410.12.239.255
3110.12.240.0/2110.12.240.1 – 10.12.247.25410.12.247.255
3210.12.248.0/2110.12.248.1 – 10.12.255.25410.12.255.255
3310.13.0.0/2110.13.0.1 – 10.13.7.25410.13.7.255
3410.13.8.0/2110.13.8.1 – 10.13.15.25410.13.15.255
3510.13.16.0/2110.13.16.1 – 10.13.23.25410.13.23.255
3610.13.24.0/2110.13.24.1 – 10.13.31.25410.13.31.255
3710.13.32.0/2110.13.32.1 – 10.13.39.25410.13.39.255
3810.13.40.0/2110.13.40.1 – 10.13.47.25410.13.47.255
3910.13.48.0/2110.13.48.1 – 10.13.55.25410.13.55.255
4010.13.56.0/2110.13.56.1 – 10.13.63.25410.13.63.255
4110.13.64.0/2110.13.64.1 – 10.13.71.25410.13.71.255
4210.13.72.0/2110.13.72.1 – 10.13.79.25410.13.79.255
4310.13.80.0/2110.13.80.1 – 10.13.87.25410.13.87.255
4410.13.88.0/2110.13.88.1 – 10.13.95.25410.13.95.255
4510.13.96.0/2110.13.96.1 – 10.13.103.25410.13.103.255
4610.13.104.0/2110.13.104.1 – 10.13.111.25410.13.111.255
4710.13.112.0/2110.13.112.1 – 10.13.119.25410.13.119.255
4810.13.120.0/2110.13.120.1 – 10.13.127.25410.13.127.255
4910.13.128.0/2110.13.128.1 – 10.13.135.25410.13.135.255
5010.13.136.0/2110.13.136.1 – 10.13.143.25410.13.143.255
5110.13.144.0/2110.13.144.1 – 10.13.151.25410.13.151.255
5210.13.152.0/2110.13.152.1 – 10.13.159.25410.13.159.255
5310.13.160.0/2110.13.160.1 – 10.13.167.25410.13.167.255
5410.13.168.0/2110.13.168.1 – 10.13.175.25410.13.175.255
5510.13.176.0/2110.13.176.1 – 10.13.183.25410.13.183.255
5610.13.184.0/2110.13.184.1 – 10.13.191.25410.13.191.255
5710.13.192.0/2110.13.192.1 – 10.13.199.25410.13.199.255
5810.13.200.0/2110.13.200.1 – 10.13.207.25410.13.207.255
5910.13.208.0/2110.13.208.1 – 10.13.215.25410.13.215.255
6010.13.216.0/2110.13.216.1 – 10.13.223.25410.13.223.255
6110.13.224.0/2110.13.224.1 – 10.13.231.25410.13.231.255
6210.13.232.0/2110.13.232.1 – 10.13.239.25410.13.239.255
6310.13.240.0/2110.13.240.1 – 10.13.247.25410.13.247.255
6410.13.248.0/2110.13.248.1 – 10.13.255.25410.13.255.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /15
/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-
/15255.254.0.0131,072131,0701
/16255.255.0.065,53665,5342 split →
/17255.255.128.032,76832,7664 split →
/18255.255.192.016,38416,3828 split →
/19255.255.224.08,1928,19016 split →
/20255.255.240.04,0964,09432 split →
/21255.255.248.02,0482,04664 split →
/22255.255.252.01,0241,022128 split →
/23255.255.254.0512510256 split →
/24255.255.255.0256254512 split →
/25255.255.255.1281281261,024 split →
/26255.255.255.19264622,048 split →
/27255.255.255.22432304,096 split →
/28255.255.255.24016148,192 split →
/29255.255.255.2488616,384 split →
/30255.255.255.2524232,768 split →
/31255.255.255.2542265,536 split →
/32255.255.255.25511131,072 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 →