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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)10.238.0.0/15
network10.238.0.0/15
broadcast10.239.255.255
first host10.238.0.1
last host10.239.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.238.0.0/15
address00001010.11101110.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.11101110.00000000.00000000
broadcast00001010.11101111.11111111.11111111
green = network part, grey = host part
hex0x0aee0000
decimal183369728
reverse dns0.0.238.10.in-addr.arpa
ipv4-mapped::ffff:aee:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.238.0.0/2110.238.0.1 – 10.238.7.25410.238.7.255
210.238.8.0/2110.238.8.1 – 10.238.15.25410.238.15.255
310.238.16.0/2110.238.16.1 – 10.238.23.25410.238.23.255
410.238.24.0/2110.238.24.1 – 10.238.31.25410.238.31.255
510.238.32.0/2110.238.32.1 – 10.238.39.25410.238.39.255
610.238.40.0/2110.238.40.1 – 10.238.47.25410.238.47.255
710.238.48.0/2110.238.48.1 – 10.238.55.25410.238.55.255
810.238.56.0/2110.238.56.1 – 10.238.63.25410.238.63.255
910.238.64.0/2110.238.64.1 – 10.238.71.25410.238.71.255
1010.238.72.0/2110.238.72.1 – 10.238.79.25410.238.79.255
1110.238.80.0/2110.238.80.1 – 10.238.87.25410.238.87.255
1210.238.88.0/2110.238.88.1 – 10.238.95.25410.238.95.255
1310.238.96.0/2110.238.96.1 – 10.238.103.25410.238.103.255
1410.238.104.0/2110.238.104.1 – 10.238.111.25410.238.111.255
1510.238.112.0/2110.238.112.1 – 10.238.119.25410.238.119.255
1610.238.120.0/2110.238.120.1 – 10.238.127.25410.238.127.255
1710.238.128.0/2110.238.128.1 – 10.238.135.25410.238.135.255
1810.238.136.0/2110.238.136.1 – 10.238.143.25410.238.143.255
1910.238.144.0/2110.238.144.1 – 10.238.151.25410.238.151.255
2010.238.152.0/2110.238.152.1 – 10.238.159.25410.238.159.255
2110.238.160.0/2110.238.160.1 – 10.238.167.25410.238.167.255
2210.238.168.0/2110.238.168.1 – 10.238.175.25410.238.175.255
2310.238.176.0/2110.238.176.1 – 10.238.183.25410.238.183.255
2410.238.184.0/2110.238.184.1 – 10.238.191.25410.238.191.255
2510.238.192.0/2110.238.192.1 – 10.238.199.25410.238.199.255
2610.238.200.0/2110.238.200.1 – 10.238.207.25410.238.207.255
2710.238.208.0/2110.238.208.1 – 10.238.215.25410.238.215.255
2810.238.216.0/2110.238.216.1 – 10.238.223.25410.238.223.255
2910.238.224.0/2110.238.224.1 – 10.238.231.25410.238.231.255
3010.238.232.0/2110.238.232.1 – 10.238.239.25410.238.239.255
3110.238.240.0/2110.238.240.1 – 10.238.247.25410.238.247.255
3210.238.248.0/2110.238.248.1 – 10.238.255.25410.238.255.255
3310.239.0.0/2110.239.0.1 – 10.239.7.25410.239.7.255
3410.239.8.0/2110.239.8.1 – 10.239.15.25410.239.15.255
3510.239.16.0/2110.239.16.1 – 10.239.23.25410.239.23.255
3610.239.24.0/2110.239.24.1 – 10.239.31.25410.239.31.255
3710.239.32.0/2110.239.32.1 – 10.239.39.25410.239.39.255
3810.239.40.0/2110.239.40.1 – 10.239.47.25410.239.47.255
3910.239.48.0/2110.239.48.1 – 10.239.55.25410.239.55.255
4010.239.56.0/2110.239.56.1 – 10.239.63.25410.239.63.255
4110.239.64.0/2110.239.64.1 – 10.239.71.25410.239.71.255
4210.239.72.0/2110.239.72.1 – 10.239.79.25410.239.79.255
4310.239.80.0/2110.239.80.1 – 10.239.87.25410.239.87.255
4410.239.88.0/2110.239.88.1 – 10.239.95.25410.239.95.255
4510.239.96.0/2110.239.96.1 – 10.239.103.25410.239.103.255
4610.239.104.0/2110.239.104.1 – 10.239.111.25410.239.111.255
4710.239.112.0/2110.239.112.1 – 10.239.119.25410.239.119.255
4810.239.120.0/2110.239.120.1 – 10.239.127.25410.239.127.255
4910.239.128.0/2110.239.128.1 – 10.239.135.25410.239.135.255
5010.239.136.0/2110.239.136.1 – 10.239.143.25410.239.143.255
5110.239.144.0/2110.239.144.1 – 10.239.151.25410.239.151.255
5210.239.152.0/2110.239.152.1 – 10.239.159.25410.239.159.255
5310.239.160.0/2110.239.160.1 – 10.239.167.25410.239.167.255
5410.239.168.0/2110.239.168.1 – 10.239.175.25410.239.175.255
5510.239.176.0/2110.239.176.1 – 10.239.183.25410.239.183.255
5610.239.184.0/2110.239.184.1 – 10.239.191.25410.239.191.255
5710.239.192.0/2110.239.192.1 – 10.239.199.25410.239.199.255
5810.239.200.0/2110.239.200.1 – 10.239.207.25410.239.207.255
5910.239.208.0/2110.239.208.1 – 10.239.215.25410.239.215.255
6010.239.216.0/2110.239.216.1 – 10.239.223.25410.239.223.255
6110.239.224.0/2110.239.224.1 – 10.239.231.25410.239.231.255
6210.239.232.0/2110.239.232.1 – 10.239.239.25410.239.239.255
6310.239.240.0/2110.239.240.1 – 10.239.247.25410.239.247.255
6410.239.248.0/2110.239.248.1 – 10.239.255.25410.239.255.255
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 →