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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)10.2.0.0/15
network10.2.0.0/15
broadcast10.3.255.255
first host10.2.0.1
last host10.3.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.2.0.0/15
address00001010.00000010.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.00000010.00000000.00000000
broadcast00001010.00000011.11111111.11111111
green = network part, grey = host part
hex0x0a020000
decimal167903232
reverse dns0.0.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.0.0/2110.2.0.1 – 10.2.7.25410.2.7.255
210.2.8.0/2110.2.8.1 – 10.2.15.25410.2.15.255
310.2.16.0/2110.2.16.1 – 10.2.23.25410.2.23.255
410.2.24.0/2110.2.24.1 – 10.2.31.25410.2.31.255
510.2.32.0/2110.2.32.1 – 10.2.39.25410.2.39.255
610.2.40.0/2110.2.40.1 – 10.2.47.25410.2.47.255
710.2.48.0/2110.2.48.1 – 10.2.55.25410.2.55.255
810.2.56.0/2110.2.56.1 – 10.2.63.25410.2.63.255
910.2.64.0/2110.2.64.1 – 10.2.71.25410.2.71.255
1010.2.72.0/2110.2.72.1 – 10.2.79.25410.2.79.255
1110.2.80.0/2110.2.80.1 – 10.2.87.25410.2.87.255
1210.2.88.0/2110.2.88.1 – 10.2.95.25410.2.95.255
1310.2.96.0/2110.2.96.1 – 10.2.103.25410.2.103.255
1410.2.104.0/2110.2.104.1 – 10.2.111.25410.2.111.255
1510.2.112.0/2110.2.112.1 – 10.2.119.25410.2.119.255
1610.2.120.0/2110.2.120.1 – 10.2.127.25410.2.127.255
1710.2.128.0/2110.2.128.1 – 10.2.135.25410.2.135.255
1810.2.136.0/2110.2.136.1 – 10.2.143.25410.2.143.255
1910.2.144.0/2110.2.144.1 – 10.2.151.25410.2.151.255
2010.2.152.0/2110.2.152.1 – 10.2.159.25410.2.159.255
2110.2.160.0/2110.2.160.1 – 10.2.167.25410.2.167.255
2210.2.168.0/2110.2.168.1 – 10.2.175.25410.2.175.255
2310.2.176.0/2110.2.176.1 – 10.2.183.25410.2.183.255
2410.2.184.0/2110.2.184.1 – 10.2.191.25410.2.191.255
2510.2.192.0/2110.2.192.1 – 10.2.199.25410.2.199.255
2610.2.200.0/2110.2.200.1 – 10.2.207.25410.2.207.255
2710.2.208.0/2110.2.208.1 – 10.2.215.25410.2.215.255
2810.2.216.0/2110.2.216.1 – 10.2.223.25410.2.223.255
2910.2.224.0/2110.2.224.1 – 10.2.231.25410.2.231.255
3010.2.232.0/2110.2.232.1 – 10.2.239.25410.2.239.255
3110.2.240.0/2110.2.240.1 – 10.2.247.25410.2.247.255
3210.2.248.0/2110.2.248.1 – 10.2.255.25410.2.255.255
3310.3.0.0/2110.3.0.1 – 10.3.7.25410.3.7.255
3410.3.8.0/2110.3.8.1 – 10.3.15.25410.3.15.255
3510.3.16.0/2110.3.16.1 – 10.3.23.25410.3.23.255
3610.3.24.0/2110.3.24.1 – 10.3.31.25410.3.31.255
3710.3.32.0/2110.3.32.1 – 10.3.39.25410.3.39.255
3810.3.40.0/2110.3.40.1 – 10.3.47.25410.3.47.255
3910.3.48.0/2110.3.48.1 – 10.3.55.25410.3.55.255
4010.3.56.0/2110.3.56.1 – 10.3.63.25410.3.63.255
4110.3.64.0/2110.3.64.1 – 10.3.71.25410.3.71.255
4210.3.72.0/2110.3.72.1 – 10.3.79.25410.3.79.255
4310.3.80.0/2110.3.80.1 – 10.3.87.25410.3.87.255
4410.3.88.0/2110.3.88.1 – 10.3.95.25410.3.95.255
4510.3.96.0/2110.3.96.1 – 10.3.103.25410.3.103.255
4610.3.104.0/2110.3.104.1 – 10.3.111.25410.3.111.255
4710.3.112.0/2110.3.112.1 – 10.3.119.25410.3.119.255
4810.3.120.0/2110.3.120.1 – 10.3.127.25410.3.127.255
4910.3.128.0/2110.3.128.1 – 10.3.135.25410.3.135.255
5010.3.136.0/2110.3.136.1 – 10.3.143.25410.3.143.255
5110.3.144.0/2110.3.144.1 – 10.3.151.25410.3.151.255
5210.3.152.0/2110.3.152.1 – 10.3.159.25410.3.159.255
5310.3.160.0/2110.3.160.1 – 10.3.167.25410.3.167.255
5410.3.168.0/2110.3.168.1 – 10.3.175.25410.3.175.255
5510.3.176.0/2110.3.176.1 – 10.3.183.25410.3.183.255
5610.3.184.0/2110.3.184.1 – 10.3.191.25410.3.191.255
5710.3.192.0/2110.3.192.1 – 10.3.199.25410.3.199.255
5810.3.200.0/2110.3.200.1 – 10.3.207.25410.3.207.255
5910.3.208.0/2110.3.208.1 – 10.3.215.25410.3.215.255
6010.3.216.0/2110.3.216.1 – 10.3.223.25410.3.223.255
6110.3.224.0/2110.3.224.1 – 10.3.231.25410.3.231.255
6210.3.232.0/2110.3.232.1 – 10.3.239.25410.3.239.255
6310.3.240.0/2110.3.240.1 – 10.3.247.25410.3.247.255
6410.3.248.0/2110.3.248.1 – 10.3.255.25410.3.255.255
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 →