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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)10.62.0.0/15
network10.62.0.0/15
broadcast10.63.255.255
first host10.62.0.1
last host10.63.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.62.0.0/15
address00001010.00111110.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.00111110.00000000.00000000
broadcast00001010.00111111.11111111.11111111
green = network part, grey = host part
hex0x0a3e0000
decimal171835392
reverse dns0.0.62.10.in-addr.arpa
ipv4-mapped::ffff:a3e:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.62.0.0/2110.62.0.1 – 10.62.7.25410.62.7.255
210.62.8.0/2110.62.8.1 – 10.62.15.25410.62.15.255
310.62.16.0/2110.62.16.1 – 10.62.23.25410.62.23.255
410.62.24.0/2110.62.24.1 – 10.62.31.25410.62.31.255
510.62.32.0/2110.62.32.1 – 10.62.39.25410.62.39.255
610.62.40.0/2110.62.40.1 – 10.62.47.25410.62.47.255
710.62.48.0/2110.62.48.1 – 10.62.55.25410.62.55.255
810.62.56.0/2110.62.56.1 – 10.62.63.25410.62.63.255
910.62.64.0/2110.62.64.1 – 10.62.71.25410.62.71.255
1010.62.72.0/2110.62.72.1 – 10.62.79.25410.62.79.255
1110.62.80.0/2110.62.80.1 – 10.62.87.25410.62.87.255
1210.62.88.0/2110.62.88.1 – 10.62.95.25410.62.95.255
1310.62.96.0/2110.62.96.1 – 10.62.103.25410.62.103.255
1410.62.104.0/2110.62.104.1 – 10.62.111.25410.62.111.255
1510.62.112.0/2110.62.112.1 – 10.62.119.25410.62.119.255
1610.62.120.0/2110.62.120.1 – 10.62.127.25410.62.127.255
1710.62.128.0/2110.62.128.1 – 10.62.135.25410.62.135.255
1810.62.136.0/2110.62.136.1 – 10.62.143.25410.62.143.255
1910.62.144.0/2110.62.144.1 – 10.62.151.25410.62.151.255
2010.62.152.0/2110.62.152.1 – 10.62.159.25410.62.159.255
2110.62.160.0/2110.62.160.1 – 10.62.167.25410.62.167.255
2210.62.168.0/2110.62.168.1 – 10.62.175.25410.62.175.255
2310.62.176.0/2110.62.176.1 – 10.62.183.25410.62.183.255
2410.62.184.0/2110.62.184.1 – 10.62.191.25410.62.191.255
2510.62.192.0/2110.62.192.1 – 10.62.199.25410.62.199.255
2610.62.200.0/2110.62.200.1 – 10.62.207.25410.62.207.255
2710.62.208.0/2110.62.208.1 – 10.62.215.25410.62.215.255
2810.62.216.0/2110.62.216.1 – 10.62.223.25410.62.223.255
2910.62.224.0/2110.62.224.1 – 10.62.231.25410.62.231.255
3010.62.232.0/2110.62.232.1 – 10.62.239.25410.62.239.255
3110.62.240.0/2110.62.240.1 – 10.62.247.25410.62.247.255
3210.62.248.0/2110.62.248.1 – 10.62.255.25410.62.255.255
3310.63.0.0/2110.63.0.1 – 10.63.7.25410.63.7.255
3410.63.8.0/2110.63.8.1 – 10.63.15.25410.63.15.255
3510.63.16.0/2110.63.16.1 – 10.63.23.25410.63.23.255
3610.63.24.0/2110.63.24.1 – 10.63.31.25410.63.31.255
3710.63.32.0/2110.63.32.1 – 10.63.39.25410.63.39.255
3810.63.40.0/2110.63.40.1 – 10.63.47.25410.63.47.255
3910.63.48.0/2110.63.48.1 – 10.63.55.25410.63.55.255
4010.63.56.0/2110.63.56.1 – 10.63.63.25410.63.63.255
4110.63.64.0/2110.63.64.1 – 10.63.71.25410.63.71.255
4210.63.72.0/2110.63.72.1 – 10.63.79.25410.63.79.255
4310.63.80.0/2110.63.80.1 – 10.63.87.25410.63.87.255
4410.63.88.0/2110.63.88.1 – 10.63.95.25410.63.95.255
4510.63.96.0/2110.63.96.1 – 10.63.103.25410.63.103.255
4610.63.104.0/2110.63.104.1 – 10.63.111.25410.63.111.255
4710.63.112.0/2110.63.112.1 – 10.63.119.25410.63.119.255
4810.63.120.0/2110.63.120.1 – 10.63.127.25410.63.127.255
4910.63.128.0/2110.63.128.1 – 10.63.135.25410.63.135.255
5010.63.136.0/2110.63.136.1 – 10.63.143.25410.63.143.255
5110.63.144.0/2110.63.144.1 – 10.63.151.25410.63.151.255
5210.63.152.0/2110.63.152.1 – 10.63.159.25410.63.159.255
5310.63.160.0/2110.63.160.1 – 10.63.167.25410.63.167.255
5410.63.168.0/2110.63.168.1 – 10.63.175.25410.63.175.255
5510.63.176.0/2110.63.176.1 – 10.63.183.25410.63.183.255
5610.63.184.0/2110.63.184.1 – 10.63.191.25410.63.191.255
5710.63.192.0/2110.63.192.1 – 10.63.199.25410.63.199.255
5810.63.200.0/2110.63.200.1 – 10.63.207.25410.63.207.255
5910.63.208.0/2110.63.208.1 – 10.63.215.25410.63.215.255
6010.63.216.0/2110.63.216.1 – 10.63.223.25410.63.223.255
6110.63.224.0/2110.63.224.1 – 10.63.231.25410.63.231.255
6210.63.232.0/2110.63.232.1 – 10.63.239.25410.63.239.255
6310.63.240.0/2110.63.240.1 – 10.63.247.25410.63.247.255
6410.63.248.0/2110.63.248.1 – 10.63.255.25410.63.255.255
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 →