ip
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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)10.56.0.0/15
network10.56.0.0/15
broadcast10.57.255.255
first host10.56.0.1
last host10.57.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.56.0.0/15
address00001010.00111000.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.00111000.00000000.00000000
broadcast00001010.00111001.11111111.11111111
green = network part, grey = host part
hex0x0a380000
decimal171442176
reverse dns0.0.56.10.in-addr.arpa
ipv4-mapped::ffff:a38:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.56.0.0/2110.56.0.1 – 10.56.7.25410.56.7.255
210.56.8.0/2110.56.8.1 – 10.56.15.25410.56.15.255
310.56.16.0/2110.56.16.1 – 10.56.23.25410.56.23.255
410.56.24.0/2110.56.24.1 – 10.56.31.25410.56.31.255
510.56.32.0/2110.56.32.1 – 10.56.39.25410.56.39.255
610.56.40.0/2110.56.40.1 – 10.56.47.25410.56.47.255
710.56.48.0/2110.56.48.1 – 10.56.55.25410.56.55.255
810.56.56.0/2110.56.56.1 – 10.56.63.25410.56.63.255
910.56.64.0/2110.56.64.1 – 10.56.71.25410.56.71.255
1010.56.72.0/2110.56.72.1 – 10.56.79.25410.56.79.255
1110.56.80.0/2110.56.80.1 – 10.56.87.25410.56.87.255
1210.56.88.0/2110.56.88.1 – 10.56.95.25410.56.95.255
1310.56.96.0/2110.56.96.1 – 10.56.103.25410.56.103.255
1410.56.104.0/2110.56.104.1 – 10.56.111.25410.56.111.255
1510.56.112.0/2110.56.112.1 – 10.56.119.25410.56.119.255
1610.56.120.0/2110.56.120.1 – 10.56.127.25410.56.127.255
1710.56.128.0/2110.56.128.1 – 10.56.135.25410.56.135.255
1810.56.136.0/2110.56.136.1 – 10.56.143.25410.56.143.255
1910.56.144.0/2110.56.144.1 – 10.56.151.25410.56.151.255
2010.56.152.0/2110.56.152.1 – 10.56.159.25410.56.159.255
2110.56.160.0/2110.56.160.1 – 10.56.167.25410.56.167.255
2210.56.168.0/2110.56.168.1 – 10.56.175.25410.56.175.255
2310.56.176.0/2110.56.176.1 – 10.56.183.25410.56.183.255
2410.56.184.0/2110.56.184.1 – 10.56.191.25410.56.191.255
2510.56.192.0/2110.56.192.1 – 10.56.199.25410.56.199.255
2610.56.200.0/2110.56.200.1 – 10.56.207.25410.56.207.255
2710.56.208.0/2110.56.208.1 – 10.56.215.25410.56.215.255
2810.56.216.0/2110.56.216.1 – 10.56.223.25410.56.223.255
2910.56.224.0/2110.56.224.1 – 10.56.231.25410.56.231.255
3010.56.232.0/2110.56.232.1 – 10.56.239.25410.56.239.255
3110.56.240.0/2110.56.240.1 – 10.56.247.25410.56.247.255
3210.56.248.0/2110.56.248.1 – 10.56.255.25410.56.255.255
3310.57.0.0/2110.57.0.1 – 10.57.7.25410.57.7.255
3410.57.8.0/2110.57.8.1 – 10.57.15.25410.57.15.255
3510.57.16.0/2110.57.16.1 – 10.57.23.25410.57.23.255
3610.57.24.0/2110.57.24.1 – 10.57.31.25410.57.31.255
3710.57.32.0/2110.57.32.1 – 10.57.39.25410.57.39.255
3810.57.40.0/2110.57.40.1 – 10.57.47.25410.57.47.255
3910.57.48.0/2110.57.48.1 – 10.57.55.25410.57.55.255
4010.57.56.0/2110.57.56.1 – 10.57.63.25410.57.63.255
4110.57.64.0/2110.57.64.1 – 10.57.71.25410.57.71.255
4210.57.72.0/2110.57.72.1 – 10.57.79.25410.57.79.255
4310.57.80.0/2110.57.80.1 – 10.57.87.25410.57.87.255
4410.57.88.0/2110.57.88.1 – 10.57.95.25410.57.95.255
4510.57.96.0/2110.57.96.1 – 10.57.103.25410.57.103.255
4610.57.104.0/2110.57.104.1 – 10.57.111.25410.57.111.255
4710.57.112.0/2110.57.112.1 – 10.57.119.25410.57.119.255
4810.57.120.0/2110.57.120.1 – 10.57.127.25410.57.127.255
4910.57.128.0/2110.57.128.1 – 10.57.135.25410.57.135.255
5010.57.136.0/2110.57.136.1 – 10.57.143.25410.57.143.255
5110.57.144.0/2110.57.144.1 – 10.57.151.25410.57.151.255
5210.57.152.0/2110.57.152.1 – 10.57.159.25410.57.159.255
5310.57.160.0/2110.57.160.1 – 10.57.167.25410.57.167.255
5410.57.168.0/2110.57.168.1 – 10.57.175.25410.57.175.255
5510.57.176.0/2110.57.176.1 – 10.57.183.25410.57.183.255
5610.57.184.0/2110.57.184.1 – 10.57.191.25410.57.191.255
5710.57.192.0/2110.57.192.1 – 10.57.199.25410.57.199.255
5810.57.200.0/2110.57.200.1 – 10.57.207.25410.57.207.255
5910.57.208.0/2110.57.208.1 – 10.57.215.25410.57.215.255
6010.57.216.0/2110.57.216.1 – 10.57.223.25410.57.223.255
6110.57.224.0/2110.57.224.1 – 10.57.231.25410.57.231.255
6210.57.232.0/2110.57.232.1 – 10.57.239.25410.57.239.255
6310.57.240.0/2110.57.240.1 – 10.57.247.25410.57.247.255
6410.57.248.0/2110.57.248.1 – 10.57.255.25410.57.255.255
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 →