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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)10.120.0.0/15
network10.120.0.0/15
broadcast10.121.255.255
first host10.120.0.1
last host10.121.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.120.0.0/15
address00001010.01111000.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.01111000.00000000.00000000
broadcast00001010.01111001.11111111.11111111
green = network part, grey = host part
hex0x0a780000
decimal175636480
reverse dns0.0.120.10.in-addr.arpa
ipv4-mapped::ffff:a78:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.120.0.0/2110.120.0.1 – 10.120.7.25410.120.7.255
210.120.8.0/2110.120.8.1 – 10.120.15.25410.120.15.255
310.120.16.0/2110.120.16.1 – 10.120.23.25410.120.23.255
410.120.24.0/2110.120.24.1 – 10.120.31.25410.120.31.255
510.120.32.0/2110.120.32.1 – 10.120.39.25410.120.39.255
610.120.40.0/2110.120.40.1 – 10.120.47.25410.120.47.255
710.120.48.0/2110.120.48.1 – 10.120.55.25410.120.55.255
810.120.56.0/2110.120.56.1 – 10.120.63.25410.120.63.255
910.120.64.0/2110.120.64.1 – 10.120.71.25410.120.71.255
1010.120.72.0/2110.120.72.1 – 10.120.79.25410.120.79.255
1110.120.80.0/2110.120.80.1 – 10.120.87.25410.120.87.255
1210.120.88.0/2110.120.88.1 – 10.120.95.25410.120.95.255
1310.120.96.0/2110.120.96.1 – 10.120.103.25410.120.103.255
1410.120.104.0/2110.120.104.1 – 10.120.111.25410.120.111.255
1510.120.112.0/2110.120.112.1 – 10.120.119.25410.120.119.255
1610.120.120.0/2110.120.120.1 – 10.120.127.25410.120.127.255
1710.120.128.0/2110.120.128.1 – 10.120.135.25410.120.135.255
1810.120.136.0/2110.120.136.1 – 10.120.143.25410.120.143.255
1910.120.144.0/2110.120.144.1 – 10.120.151.25410.120.151.255
2010.120.152.0/2110.120.152.1 – 10.120.159.25410.120.159.255
2110.120.160.0/2110.120.160.1 – 10.120.167.25410.120.167.255
2210.120.168.0/2110.120.168.1 – 10.120.175.25410.120.175.255
2310.120.176.0/2110.120.176.1 – 10.120.183.25410.120.183.255
2410.120.184.0/2110.120.184.1 – 10.120.191.25410.120.191.255
2510.120.192.0/2110.120.192.1 – 10.120.199.25410.120.199.255
2610.120.200.0/2110.120.200.1 – 10.120.207.25410.120.207.255
2710.120.208.0/2110.120.208.1 – 10.120.215.25410.120.215.255
2810.120.216.0/2110.120.216.1 – 10.120.223.25410.120.223.255
2910.120.224.0/2110.120.224.1 – 10.120.231.25410.120.231.255
3010.120.232.0/2110.120.232.1 – 10.120.239.25410.120.239.255
3110.120.240.0/2110.120.240.1 – 10.120.247.25410.120.247.255
3210.120.248.0/2110.120.248.1 – 10.120.255.25410.120.255.255
3310.121.0.0/2110.121.0.1 – 10.121.7.25410.121.7.255
3410.121.8.0/2110.121.8.1 – 10.121.15.25410.121.15.255
3510.121.16.0/2110.121.16.1 – 10.121.23.25410.121.23.255
3610.121.24.0/2110.121.24.1 – 10.121.31.25410.121.31.255
3710.121.32.0/2110.121.32.1 – 10.121.39.25410.121.39.255
3810.121.40.0/2110.121.40.1 – 10.121.47.25410.121.47.255
3910.121.48.0/2110.121.48.1 – 10.121.55.25410.121.55.255
4010.121.56.0/2110.121.56.1 – 10.121.63.25410.121.63.255
4110.121.64.0/2110.121.64.1 – 10.121.71.25410.121.71.255
4210.121.72.0/2110.121.72.1 – 10.121.79.25410.121.79.255
4310.121.80.0/2110.121.80.1 – 10.121.87.25410.121.87.255
4410.121.88.0/2110.121.88.1 – 10.121.95.25410.121.95.255
4510.121.96.0/2110.121.96.1 – 10.121.103.25410.121.103.255
4610.121.104.0/2110.121.104.1 – 10.121.111.25410.121.111.255
4710.121.112.0/2110.121.112.1 – 10.121.119.25410.121.119.255
4810.121.120.0/2110.121.120.1 – 10.121.127.25410.121.127.255
4910.121.128.0/2110.121.128.1 – 10.121.135.25410.121.135.255
5010.121.136.0/2110.121.136.1 – 10.121.143.25410.121.143.255
5110.121.144.0/2110.121.144.1 – 10.121.151.25410.121.151.255
5210.121.152.0/2110.121.152.1 – 10.121.159.25410.121.159.255
5310.121.160.0/2110.121.160.1 – 10.121.167.25410.121.167.255
5410.121.168.0/2110.121.168.1 – 10.121.175.25410.121.175.255
5510.121.176.0/2110.121.176.1 – 10.121.183.25410.121.183.255
5610.121.184.0/2110.121.184.1 – 10.121.191.25410.121.191.255
5710.121.192.0/2110.121.192.1 – 10.121.199.25410.121.199.255
5810.121.200.0/2110.121.200.1 – 10.121.207.25410.121.207.255
5910.121.208.0/2110.121.208.1 – 10.121.215.25410.121.215.255
6010.121.216.0/2110.121.216.1 – 10.121.223.25410.121.223.255
6110.121.224.0/2110.121.224.1 – 10.121.231.25410.121.231.255
6210.121.232.0/2110.121.232.1 – 10.121.239.25410.121.239.255
6310.121.240.0/2110.121.240.1 – 10.121.247.25410.121.247.255
6410.121.248.0/2110.121.248.1 – 10.121.255.25410.121.255.255
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 →