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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)10.122.0.0/15
network10.122.0.0/15
broadcast10.123.255.255
first host10.122.0.1
last host10.123.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.122.0.0/15
address00001010.01111010.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.01111010.00000000.00000000
broadcast00001010.01111011.11111111.11111111
green = network part, grey = host part
hex0x0a7a0000
decimal175767552
reverse dns0.0.122.10.in-addr.arpa
ipv4-mapped::ffff:a7a:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.122.0.0/2110.122.0.1 – 10.122.7.25410.122.7.255
210.122.8.0/2110.122.8.1 – 10.122.15.25410.122.15.255
310.122.16.0/2110.122.16.1 – 10.122.23.25410.122.23.255
410.122.24.0/2110.122.24.1 – 10.122.31.25410.122.31.255
510.122.32.0/2110.122.32.1 – 10.122.39.25410.122.39.255
610.122.40.0/2110.122.40.1 – 10.122.47.25410.122.47.255
710.122.48.0/2110.122.48.1 – 10.122.55.25410.122.55.255
810.122.56.0/2110.122.56.1 – 10.122.63.25410.122.63.255
910.122.64.0/2110.122.64.1 – 10.122.71.25410.122.71.255
1010.122.72.0/2110.122.72.1 – 10.122.79.25410.122.79.255
1110.122.80.0/2110.122.80.1 – 10.122.87.25410.122.87.255
1210.122.88.0/2110.122.88.1 – 10.122.95.25410.122.95.255
1310.122.96.0/2110.122.96.1 – 10.122.103.25410.122.103.255
1410.122.104.0/2110.122.104.1 – 10.122.111.25410.122.111.255
1510.122.112.0/2110.122.112.1 – 10.122.119.25410.122.119.255
1610.122.120.0/2110.122.120.1 – 10.122.127.25410.122.127.255
1710.122.128.0/2110.122.128.1 – 10.122.135.25410.122.135.255
1810.122.136.0/2110.122.136.1 – 10.122.143.25410.122.143.255
1910.122.144.0/2110.122.144.1 – 10.122.151.25410.122.151.255
2010.122.152.0/2110.122.152.1 – 10.122.159.25410.122.159.255
2110.122.160.0/2110.122.160.1 – 10.122.167.25410.122.167.255
2210.122.168.0/2110.122.168.1 – 10.122.175.25410.122.175.255
2310.122.176.0/2110.122.176.1 – 10.122.183.25410.122.183.255
2410.122.184.0/2110.122.184.1 – 10.122.191.25410.122.191.255
2510.122.192.0/2110.122.192.1 – 10.122.199.25410.122.199.255
2610.122.200.0/2110.122.200.1 – 10.122.207.25410.122.207.255
2710.122.208.0/2110.122.208.1 – 10.122.215.25410.122.215.255
2810.122.216.0/2110.122.216.1 – 10.122.223.25410.122.223.255
2910.122.224.0/2110.122.224.1 – 10.122.231.25410.122.231.255
3010.122.232.0/2110.122.232.1 – 10.122.239.25410.122.239.255
3110.122.240.0/2110.122.240.1 – 10.122.247.25410.122.247.255
3210.122.248.0/2110.122.248.1 – 10.122.255.25410.122.255.255
3310.123.0.0/2110.123.0.1 – 10.123.7.25410.123.7.255
3410.123.8.0/2110.123.8.1 – 10.123.15.25410.123.15.255
3510.123.16.0/2110.123.16.1 – 10.123.23.25410.123.23.255
3610.123.24.0/2110.123.24.1 – 10.123.31.25410.123.31.255
3710.123.32.0/2110.123.32.1 – 10.123.39.25410.123.39.255
3810.123.40.0/2110.123.40.1 – 10.123.47.25410.123.47.255
3910.123.48.0/2110.123.48.1 – 10.123.55.25410.123.55.255
4010.123.56.0/2110.123.56.1 – 10.123.63.25410.123.63.255
4110.123.64.0/2110.123.64.1 – 10.123.71.25410.123.71.255
4210.123.72.0/2110.123.72.1 – 10.123.79.25410.123.79.255
4310.123.80.0/2110.123.80.1 – 10.123.87.25410.123.87.255
4410.123.88.0/2110.123.88.1 – 10.123.95.25410.123.95.255
4510.123.96.0/2110.123.96.1 – 10.123.103.25410.123.103.255
4610.123.104.0/2110.123.104.1 – 10.123.111.25410.123.111.255
4710.123.112.0/2110.123.112.1 – 10.123.119.25410.123.119.255
4810.123.120.0/2110.123.120.1 – 10.123.127.25410.123.127.255
4910.123.128.0/2110.123.128.1 – 10.123.135.25410.123.135.255
5010.123.136.0/2110.123.136.1 – 10.123.143.25410.123.143.255
5110.123.144.0/2110.123.144.1 – 10.123.151.25410.123.151.255
5210.123.152.0/2110.123.152.1 – 10.123.159.25410.123.159.255
5310.123.160.0/2110.123.160.1 – 10.123.167.25410.123.167.255
5410.123.168.0/2110.123.168.1 – 10.123.175.25410.123.175.255
5510.123.176.0/2110.123.176.1 – 10.123.183.25410.123.183.255
5610.123.184.0/2110.123.184.1 – 10.123.191.25410.123.191.255
5710.123.192.0/2110.123.192.1 – 10.123.199.25410.123.199.255
5810.123.200.0/2110.123.200.1 – 10.123.207.25410.123.207.255
5910.123.208.0/2110.123.208.1 – 10.123.215.25410.123.215.255
6010.123.216.0/2110.123.216.1 – 10.123.223.25410.123.223.255
6110.123.224.0/2110.123.224.1 – 10.123.231.25410.123.231.255
6210.123.232.0/2110.123.232.1 – 10.123.239.25410.123.239.255
6310.123.240.0/2110.123.240.1 – 10.123.247.25410.123.247.255
6410.123.248.0/2110.123.248.1 – 10.123.255.25410.123.255.255
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 →