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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)10.26.0.0/15
network10.26.0.0/15
broadcast10.27.255.255
first host10.26.0.1
last host10.27.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.26.0.0/15
address00001010.00011010.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.00011010.00000000.00000000
broadcast00001010.00011011.11111111.11111111
green = network part, grey = host part
hex0x0a1a0000
decimal169476096
reverse dns0.0.26.10.in-addr.arpa
ipv4-mapped::ffff:a1a:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.26.0.0/2110.26.0.1 – 10.26.7.25410.26.7.255
210.26.8.0/2110.26.8.1 – 10.26.15.25410.26.15.255
310.26.16.0/2110.26.16.1 – 10.26.23.25410.26.23.255
410.26.24.0/2110.26.24.1 – 10.26.31.25410.26.31.255
510.26.32.0/2110.26.32.1 – 10.26.39.25410.26.39.255
610.26.40.0/2110.26.40.1 – 10.26.47.25410.26.47.255
710.26.48.0/2110.26.48.1 – 10.26.55.25410.26.55.255
810.26.56.0/2110.26.56.1 – 10.26.63.25410.26.63.255
910.26.64.0/2110.26.64.1 – 10.26.71.25410.26.71.255
1010.26.72.0/2110.26.72.1 – 10.26.79.25410.26.79.255
1110.26.80.0/2110.26.80.1 – 10.26.87.25410.26.87.255
1210.26.88.0/2110.26.88.1 – 10.26.95.25410.26.95.255
1310.26.96.0/2110.26.96.1 – 10.26.103.25410.26.103.255
1410.26.104.0/2110.26.104.1 – 10.26.111.25410.26.111.255
1510.26.112.0/2110.26.112.1 – 10.26.119.25410.26.119.255
1610.26.120.0/2110.26.120.1 – 10.26.127.25410.26.127.255
1710.26.128.0/2110.26.128.1 – 10.26.135.25410.26.135.255
1810.26.136.0/2110.26.136.1 – 10.26.143.25410.26.143.255
1910.26.144.0/2110.26.144.1 – 10.26.151.25410.26.151.255
2010.26.152.0/2110.26.152.1 – 10.26.159.25410.26.159.255
2110.26.160.0/2110.26.160.1 – 10.26.167.25410.26.167.255
2210.26.168.0/2110.26.168.1 – 10.26.175.25410.26.175.255
2310.26.176.0/2110.26.176.1 – 10.26.183.25410.26.183.255
2410.26.184.0/2110.26.184.1 – 10.26.191.25410.26.191.255
2510.26.192.0/2110.26.192.1 – 10.26.199.25410.26.199.255
2610.26.200.0/2110.26.200.1 – 10.26.207.25410.26.207.255
2710.26.208.0/2110.26.208.1 – 10.26.215.25410.26.215.255
2810.26.216.0/2110.26.216.1 – 10.26.223.25410.26.223.255
2910.26.224.0/2110.26.224.1 – 10.26.231.25410.26.231.255
3010.26.232.0/2110.26.232.1 – 10.26.239.25410.26.239.255
3110.26.240.0/2110.26.240.1 – 10.26.247.25410.26.247.255
3210.26.248.0/2110.26.248.1 – 10.26.255.25410.26.255.255
3310.27.0.0/2110.27.0.1 – 10.27.7.25410.27.7.255
3410.27.8.0/2110.27.8.1 – 10.27.15.25410.27.15.255
3510.27.16.0/2110.27.16.1 – 10.27.23.25410.27.23.255
3610.27.24.0/2110.27.24.1 – 10.27.31.25410.27.31.255
3710.27.32.0/2110.27.32.1 – 10.27.39.25410.27.39.255
3810.27.40.0/2110.27.40.1 – 10.27.47.25410.27.47.255
3910.27.48.0/2110.27.48.1 – 10.27.55.25410.27.55.255
4010.27.56.0/2110.27.56.1 – 10.27.63.25410.27.63.255
4110.27.64.0/2110.27.64.1 – 10.27.71.25410.27.71.255
4210.27.72.0/2110.27.72.1 – 10.27.79.25410.27.79.255
4310.27.80.0/2110.27.80.1 – 10.27.87.25410.27.87.255
4410.27.88.0/2110.27.88.1 – 10.27.95.25410.27.95.255
4510.27.96.0/2110.27.96.1 – 10.27.103.25410.27.103.255
4610.27.104.0/2110.27.104.1 – 10.27.111.25410.27.111.255
4710.27.112.0/2110.27.112.1 – 10.27.119.25410.27.119.255
4810.27.120.0/2110.27.120.1 – 10.27.127.25410.27.127.255
4910.27.128.0/2110.27.128.1 – 10.27.135.25410.27.135.255
5010.27.136.0/2110.27.136.1 – 10.27.143.25410.27.143.255
5110.27.144.0/2110.27.144.1 – 10.27.151.25410.27.151.255
5210.27.152.0/2110.27.152.1 – 10.27.159.25410.27.159.255
5310.27.160.0/2110.27.160.1 – 10.27.167.25410.27.167.255
5410.27.168.0/2110.27.168.1 – 10.27.175.25410.27.175.255
5510.27.176.0/2110.27.176.1 – 10.27.183.25410.27.183.255
5610.27.184.0/2110.27.184.1 – 10.27.191.25410.27.191.255
5710.27.192.0/2110.27.192.1 – 10.27.199.25410.27.199.255
5810.27.200.0/2110.27.200.1 – 10.27.207.25410.27.207.255
5910.27.208.0/2110.27.208.1 – 10.27.215.25410.27.215.255
6010.27.216.0/2110.27.216.1 – 10.27.223.25410.27.223.255
6110.27.224.0/2110.27.224.1 – 10.27.231.25410.27.231.255
6210.27.232.0/2110.27.232.1 – 10.27.239.25410.27.239.255
6310.27.240.0/2110.27.240.1 – 10.27.247.25410.27.247.255
6410.27.248.0/2110.27.248.1 – 10.27.255.25410.27.255.255
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 →