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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)10.78.0.0/15
network10.78.0.0/15
broadcast10.79.255.255
first host10.78.0.1
last host10.79.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.78.0.0/15
address00001010.01001110.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.01001110.00000000.00000000
broadcast00001010.01001111.11111111.11111111
green = network part, grey = host part
hex0x0a4e0000
decimal172883968
reverse dns0.0.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.78.0.0/2110.78.0.1 – 10.78.7.25410.78.7.255
210.78.8.0/2110.78.8.1 – 10.78.15.25410.78.15.255
310.78.16.0/2110.78.16.1 – 10.78.23.25410.78.23.255
410.78.24.0/2110.78.24.1 – 10.78.31.25410.78.31.255
510.78.32.0/2110.78.32.1 – 10.78.39.25410.78.39.255
610.78.40.0/2110.78.40.1 – 10.78.47.25410.78.47.255
710.78.48.0/2110.78.48.1 – 10.78.55.25410.78.55.255
810.78.56.0/2110.78.56.1 – 10.78.63.25410.78.63.255
910.78.64.0/2110.78.64.1 – 10.78.71.25410.78.71.255
1010.78.72.0/2110.78.72.1 – 10.78.79.25410.78.79.255
1110.78.80.0/2110.78.80.1 – 10.78.87.25410.78.87.255
1210.78.88.0/2110.78.88.1 – 10.78.95.25410.78.95.255
1310.78.96.0/2110.78.96.1 – 10.78.103.25410.78.103.255
1410.78.104.0/2110.78.104.1 – 10.78.111.25410.78.111.255
1510.78.112.0/2110.78.112.1 – 10.78.119.25410.78.119.255
1610.78.120.0/2110.78.120.1 – 10.78.127.25410.78.127.255
1710.78.128.0/2110.78.128.1 – 10.78.135.25410.78.135.255
1810.78.136.0/2110.78.136.1 – 10.78.143.25410.78.143.255
1910.78.144.0/2110.78.144.1 – 10.78.151.25410.78.151.255
2010.78.152.0/2110.78.152.1 – 10.78.159.25410.78.159.255
2110.78.160.0/2110.78.160.1 – 10.78.167.25410.78.167.255
2210.78.168.0/2110.78.168.1 – 10.78.175.25410.78.175.255
2310.78.176.0/2110.78.176.1 – 10.78.183.25410.78.183.255
2410.78.184.0/2110.78.184.1 – 10.78.191.25410.78.191.255
2510.78.192.0/2110.78.192.1 – 10.78.199.25410.78.199.255
2610.78.200.0/2110.78.200.1 – 10.78.207.25410.78.207.255
2710.78.208.0/2110.78.208.1 – 10.78.215.25410.78.215.255
2810.78.216.0/2110.78.216.1 – 10.78.223.25410.78.223.255
2910.78.224.0/2110.78.224.1 – 10.78.231.25410.78.231.255
3010.78.232.0/2110.78.232.1 – 10.78.239.25410.78.239.255
3110.78.240.0/2110.78.240.1 – 10.78.247.25410.78.247.255
3210.78.248.0/2110.78.248.1 – 10.78.255.25410.78.255.255
3310.79.0.0/2110.79.0.1 – 10.79.7.25410.79.7.255
3410.79.8.0/2110.79.8.1 – 10.79.15.25410.79.15.255
3510.79.16.0/2110.79.16.1 – 10.79.23.25410.79.23.255
3610.79.24.0/2110.79.24.1 – 10.79.31.25410.79.31.255
3710.79.32.0/2110.79.32.1 – 10.79.39.25410.79.39.255
3810.79.40.0/2110.79.40.1 – 10.79.47.25410.79.47.255
3910.79.48.0/2110.79.48.1 – 10.79.55.25410.79.55.255
4010.79.56.0/2110.79.56.1 – 10.79.63.25410.79.63.255
4110.79.64.0/2110.79.64.1 – 10.79.71.25410.79.71.255
4210.79.72.0/2110.79.72.1 – 10.79.79.25410.79.79.255
4310.79.80.0/2110.79.80.1 – 10.79.87.25410.79.87.255
4410.79.88.0/2110.79.88.1 – 10.79.95.25410.79.95.255
4510.79.96.0/2110.79.96.1 – 10.79.103.25410.79.103.255
4610.79.104.0/2110.79.104.1 – 10.79.111.25410.79.111.255
4710.79.112.0/2110.79.112.1 – 10.79.119.25410.79.119.255
4810.79.120.0/2110.79.120.1 – 10.79.127.25410.79.127.255
4910.79.128.0/2110.79.128.1 – 10.79.135.25410.79.135.255
5010.79.136.0/2110.79.136.1 – 10.79.143.25410.79.143.255
5110.79.144.0/2110.79.144.1 – 10.79.151.25410.79.151.255
5210.79.152.0/2110.79.152.1 – 10.79.159.25410.79.159.255
5310.79.160.0/2110.79.160.1 – 10.79.167.25410.79.167.255
5410.79.168.0/2110.79.168.1 – 10.79.175.25410.79.175.255
5510.79.176.0/2110.79.176.1 – 10.79.183.25410.79.183.255
5610.79.184.0/2110.79.184.1 – 10.79.191.25410.79.191.255
5710.79.192.0/2110.79.192.1 – 10.79.199.25410.79.199.255
5810.79.200.0/2110.79.200.1 – 10.79.207.25410.79.207.255
5910.79.208.0/2110.79.208.1 – 10.79.215.25410.79.215.255
6010.79.216.0/2110.79.216.1 – 10.79.223.25410.79.223.255
6110.79.224.0/2110.79.224.1 – 10.79.231.25410.79.231.255
6210.79.232.0/2110.79.232.1 – 10.79.239.25410.79.239.255
6310.79.240.0/2110.79.240.1 – 10.79.247.25410.79.247.255
6410.79.248.0/2110.79.248.1 – 10.79.255.25410.79.255.255
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 →