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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)10.232.0.0/15
network10.232.0.0/15
broadcast10.233.255.255
first host10.232.0.1
last host10.233.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.232.0.0/15
address00001010.11101000.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.11101000.00000000.00000000
broadcast00001010.11101001.11111111.11111111
green = network part, grey = host part
hex0x0ae80000
decimal182976512
reverse dns0.0.232.10.in-addr.arpa
ipv4-mapped::ffff:ae8:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.232.0.0/2110.232.0.1 – 10.232.7.25410.232.7.255
210.232.8.0/2110.232.8.1 – 10.232.15.25410.232.15.255
310.232.16.0/2110.232.16.1 – 10.232.23.25410.232.23.255
410.232.24.0/2110.232.24.1 – 10.232.31.25410.232.31.255
510.232.32.0/2110.232.32.1 – 10.232.39.25410.232.39.255
610.232.40.0/2110.232.40.1 – 10.232.47.25410.232.47.255
710.232.48.0/2110.232.48.1 – 10.232.55.25410.232.55.255
810.232.56.0/2110.232.56.1 – 10.232.63.25410.232.63.255
910.232.64.0/2110.232.64.1 – 10.232.71.25410.232.71.255
1010.232.72.0/2110.232.72.1 – 10.232.79.25410.232.79.255
1110.232.80.0/2110.232.80.1 – 10.232.87.25410.232.87.255
1210.232.88.0/2110.232.88.1 – 10.232.95.25410.232.95.255
1310.232.96.0/2110.232.96.1 – 10.232.103.25410.232.103.255
1410.232.104.0/2110.232.104.1 – 10.232.111.25410.232.111.255
1510.232.112.0/2110.232.112.1 – 10.232.119.25410.232.119.255
1610.232.120.0/2110.232.120.1 – 10.232.127.25410.232.127.255
1710.232.128.0/2110.232.128.1 – 10.232.135.25410.232.135.255
1810.232.136.0/2110.232.136.1 – 10.232.143.25410.232.143.255
1910.232.144.0/2110.232.144.1 – 10.232.151.25410.232.151.255
2010.232.152.0/2110.232.152.1 – 10.232.159.25410.232.159.255
2110.232.160.0/2110.232.160.1 – 10.232.167.25410.232.167.255
2210.232.168.0/2110.232.168.1 – 10.232.175.25410.232.175.255
2310.232.176.0/2110.232.176.1 – 10.232.183.25410.232.183.255
2410.232.184.0/2110.232.184.1 – 10.232.191.25410.232.191.255
2510.232.192.0/2110.232.192.1 – 10.232.199.25410.232.199.255
2610.232.200.0/2110.232.200.1 – 10.232.207.25410.232.207.255
2710.232.208.0/2110.232.208.1 – 10.232.215.25410.232.215.255
2810.232.216.0/2110.232.216.1 – 10.232.223.25410.232.223.255
2910.232.224.0/2110.232.224.1 – 10.232.231.25410.232.231.255
3010.232.232.0/2110.232.232.1 – 10.232.239.25410.232.239.255
3110.232.240.0/2110.232.240.1 – 10.232.247.25410.232.247.255
3210.232.248.0/2110.232.248.1 – 10.232.255.25410.232.255.255
3310.233.0.0/2110.233.0.1 – 10.233.7.25410.233.7.255
3410.233.8.0/2110.233.8.1 – 10.233.15.25410.233.15.255
3510.233.16.0/2110.233.16.1 – 10.233.23.25410.233.23.255
3610.233.24.0/2110.233.24.1 – 10.233.31.25410.233.31.255
3710.233.32.0/2110.233.32.1 – 10.233.39.25410.233.39.255
3810.233.40.0/2110.233.40.1 – 10.233.47.25410.233.47.255
3910.233.48.0/2110.233.48.1 – 10.233.55.25410.233.55.255
4010.233.56.0/2110.233.56.1 – 10.233.63.25410.233.63.255
4110.233.64.0/2110.233.64.1 – 10.233.71.25410.233.71.255
4210.233.72.0/2110.233.72.1 – 10.233.79.25410.233.79.255
4310.233.80.0/2110.233.80.1 – 10.233.87.25410.233.87.255
4410.233.88.0/2110.233.88.1 – 10.233.95.25410.233.95.255
4510.233.96.0/2110.233.96.1 – 10.233.103.25410.233.103.255
4610.233.104.0/2110.233.104.1 – 10.233.111.25410.233.111.255
4710.233.112.0/2110.233.112.1 – 10.233.119.25410.233.119.255
4810.233.120.0/2110.233.120.1 – 10.233.127.25410.233.127.255
4910.233.128.0/2110.233.128.1 – 10.233.135.25410.233.135.255
5010.233.136.0/2110.233.136.1 – 10.233.143.25410.233.143.255
5110.233.144.0/2110.233.144.1 – 10.233.151.25410.233.151.255
5210.233.152.0/2110.233.152.1 – 10.233.159.25410.233.159.255
5310.233.160.0/2110.233.160.1 – 10.233.167.25410.233.167.255
5410.233.168.0/2110.233.168.1 – 10.233.175.25410.233.175.255
5510.233.176.0/2110.233.176.1 – 10.233.183.25410.233.183.255
5610.233.184.0/2110.233.184.1 – 10.233.191.25410.233.191.255
5710.233.192.0/2110.233.192.1 – 10.233.199.25410.233.199.255
5810.233.200.0/2110.233.200.1 – 10.233.207.25410.233.207.255
5910.233.208.0/2110.233.208.1 – 10.233.215.25410.233.215.255
6010.233.216.0/2110.233.216.1 – 10.233.223.25410.233.223.255
6110.233.224.0/2110.233.224.1 – 10.233.231.25410.233.231.255
6210.233.232.0/2110.233.232.1 – 10.233.239.25410.233.239.255
6310.233.240.0/2110.233.240.1 – 10.233.247.25410.233.247.255
6410.233.248.0/2110.233.248.1 – 10.233.255.25410.233.255.255
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 →