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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)10.212.0.0/15
network10.212.0.0/15
broadcast10.213.255.255
first host10.212.0.1
last host10.213.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.212.0.0/15
address00001010.11010100.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.11010100.00000000.00000000
broadcast00001010.11010101.11111111.11111111
green = network part, grey = host part
hex0x0ad40000
decimal181665792
reverse dns0.0.212.10.in-addr.arpa
ipv4-mapped::ffff:ad4:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.212.0.0/2110.212.0.1 – 10.212.7.25410.212.7.255
210.212.8.0/2110.212.8.1 – 10.212.15.25410.212.15.255
310.212.16.0/2110.212.16.1 – 10.212.23.25410.212.23.255
410.212.24.0/2110.212.24.1 – 10.212.31.25410.212.31.255
510.212.32.0/2110.212.32.1 – 10.212.39.25410.212.39.255
610.212.40.0/2110.212.40.1 – 10.212.47.25410.212.47.255
710.212.48.0/2110.212.48.1 – 10.212.55.25410.212.55.255
810.212.56.0/2110.212.56.1 – 10.212.63.25410.212.63.255
910.212.64.0/2110.212.64.1 – 10.212.71.25410.212.71.255
1010.212.72.0/2110.212.72.1 – 10.212.79.25410.212.79.255
1110.212.80.0/2110.212.80.1 – 10.212.87.25410.212.87.255
1210.212.88.0/2110.212.88.1 – 10.212.95.25410.212.95.255
1310.212.96.0/2110.212.96.1 – 10.212.103.25410.212.103.255
1410.212.104.0/2110.212.104.1 – 10.212.111.25410.212.111.255
1510.212.112.0/2110.212.112.1 – 10.212.119.25410.212.119.255
1610.212.120.0/2110.212.120.1 – 10.212.127.25410.212.127.255
1710.212.128.0/2110.212.128.1 – 10.212.135.25410.212.135.255
1810.212.136.0/2110.212.136.1 – 10.212.143.25410.212.143.255
1910.212.144.0/2110.212.144.1 – 10.212.151.25410.212.151.255
2010.212.152.0/2110.212.152.1 – 10.212.159.25410.212.159.255
2110.212.160.0/2110.212.160.1 – 10.212.167.25410.212.167.255
2210.212.168.0/2110.212.168.1 – 10.212.175.25410.212.175.255
2310.212.176.0/2110.212.176.1 – 10.212.183.25410.212.183.255
2410.212.184.0/2110.212.184.1 – 10.212.191.25410.212.191.255
2510.212.192.0/2110.212.192.1 – 10.212.199.25410.212.199.255
2610.212.200.0/2110.212.200.1 – 10.212.207.25410.212.207.255
2710.212.208.0/2110.212.208.1 – 10.212.215.25410.212.215.255
2810.212.216.0/2110.212.216.1 – 10.212.223.25410.212.223.255
2910.212.224.0/2110.212.224.1 – 10.212.231.25410.212.231.255
3010.212.232.0/2110.212.232.1 – 10.212.239.25410.212.239.255
3110.212.240.0/2110.212.240.1 – 10.212.247.25410.212.247.255
3210.212.248.0/2110.212.248.1 – 10.212.255.25410.212.255.255
3310.213.0.0/2110.213.0.1 – 10.213.7.25410.213.7.255
3410.213.8.0/2110.213.8.1 – 10.213.15.25410.213.15.255
3510.213.16.0/2110.213.16.1 – 10.213.23.25410.213.23.255
3610.213.24.0/2110.213.24.1 – 10.213.31.25410.213.31.255
3710.213.32.0/2110.213.32.1 – 10.213.39.25410.213.39.255
3810.213.40.0/2110.213.40.1 – 10.213.47.25410.213.47.255
3910.213.48.0/2110.213.48.1 – 10.213.55.25410.213.55.255
4010.213.56.0/2110.213.56.1 – 10.213.63.25410.213.63.255
4110.213.64.0/2110.213.64.1 – 10.213.71.25410.213.71.255
4210.213.72.0/2110.213.72.1 – 10.213.79.25410.213.79.255
4310.213.80.0/2110.213.80.1 – 10.213.87.25410.213.87.255
4410.213.88.0/2110.213.88.1 – 10.213.95.25410.213.95.255
4510.213.96.0/2110.213.96.1 – 10.213.103.25410.213.103.255
4610.213.104.0/2110.213.104.1 – 10.213.111.25410.213.111.255
4710.213.112.0/2110.213.112.1 – 10.213.119.25410.213.119.255
4810.213.120.0/2110.213.120.1 – 10.213.127.25410.213.127.255
4910.213.128.0/2110.213.128.1 – 10.213.135.25410.213.135.255
5010.213.136.0/2110.213.136.1 – 10.213.143.25410.213.143.255
5110.213.144.0/2110.213.144.1 – 10.213.151.25410.213.151.255
5210.213.152.0/2110.213.152.1 – 10.213.159.25410.213.159.255
5310.213.160.0/2110.213.160.1 – 10.213.167.25410.213.167.255
5410.213.168.0/2110.213.168.1 – 10.213.175.25410.213.175.255
5510.213.176.0/2110.213.176.1 – 10.213.183.25410.213.183.255
5610.213.184.0/2110.213.184.1 – 10.213.191.25410.213.191.255
5710.213.192.0/2110.213.192.1 – 10.213.199.25410.213.199.255
5810.213.200.0/2110.213.200.1 – 10.213.207.25410.213.207.255
5910.213.208.0/2110.213.208.1 – 10.213.215.25410.213.215.255
6010.213.216.0/2110.213.216.1 – 10.213.223.25410.213.223.255
6110.213.224.0/2110.213.224.1 – 10.213.231.25410.213.231.255
6210.213.232.0/2110.213.232.1 – 10.213.239.25410.213.239.255
6310.213.240.0/2110.213.240.1 – 10.213.247.25410.213.247.255
6410.213.248.0/2110.213.248.1 – 10.213.255.25410.213.255.255
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 →