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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)10.250.0.0/15
network10.250.0.0/15
broadcast10.251.255.255
first host10.250.0.1
last host10.251.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.250.0.0/15
address00001010.11111010.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.11111010.00000000.00000000
broadcast00001010.11111011.11111111.11111111
green = network part, grey = host part
hex0x0afa0000
decimal184156160
reverse dns0.0.250.10.in-addr.arpa
ipv4-mapped::ffff:afa:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.250.0.0/2110.250.0.1 – 10.250.7.25410.250.7.255
210.250.8.0/2110.250.8.1 – 10.250.15.25410.250.15.255
310.250.16.0/2110.250.16.1 – 10.250.23.25410.250.23.255
410.250.24.0/2110.250.24.1 – 10.250.31.25410.250.31.255
510.250.32.0/2110.250.32.1 – 10.250.39.25410.250.39.255
610.250.40.0/2110.250.40.1 – 10.250.47.25410.250.47.255
710.250.48.0/2110.250.48.1 – 10.250.55.25410.250.55.255
810.250.56.0/2110.250.56.1 – 10.250.63.25410.250.63.255
910.250.64.0/2110.250.64.1 – 10.250.71.25410.250.71.255
1010.250.72.0/2110.250.72.1 – 10.250.79.25410.250.79.255
1110.250.80.0/2110.250.80.1 – 10.250.87.25410.250.87.255
1210.250.88.0/2110.250.88.1 – 10.250.95.25410.250.95.255
1310.250.96.0/2110.250.96.1 – 10.250.103.25410.250.103.255
1410.250.104.0/2110.250.104.1 – 10.250.111.25410.250.111.255
1510.250.112.0/2110.250.112.1 – 10.250.119.25410.250.119.255
1610.250.120.0/2110.250.120.1 – 10.250.127.25410.250.127.255
1710.250.128.0/2110.250.128.1 – 10.250.135.25410.250.135.255
1810.250.136.0/2110.250.136.1 – 10.250.143.25410.250.143.255
1910.250.144.0/2110.250.144.1 – 10.250.151.25410.250.151.255
2010.250.152.0/2110.250.152.1 – 10.250.159.25410.250.159.255
2110.250.160.0/2110.250.160.1 – 10.250.167.25410.250.167.255
2210.250.168.0/2110.250.168.1 – 10.250.175.25410.250.175.255
2310.250.176.0/2110.250.176.1 – 10.250.183.25410.250.183.255
2410.250.184.0/2110.250.184.1 – 10.250.191.25410.250.191.255
2510.250.192.0/2110.250.192.1 – 10.250.199.25410.250.199.255
2610.250.200.0/2110.250.200.1 – 10.250.207.25410.250.207.255
2710.250.208.0/2110.250.208.1 – 10.250.215.25410.250.215.255
2810.250.216.0/2110.250.216.1 – 10.250.223.25410.250.223.255
2910.250.224.0/2110.250.224.1 – 10.250.231.25410.250.231.255
3010.250.232.0/2110.250.232.1 – 10.250.239.25410.250.239.255
3110.250.240.0/2110.250.240.1 – 10.250.247.25410.250.247.255
3210.250.248.0/2110.250.248.1 – 10.250.255.25410.250.255.255
3310.251.0.0/2110.251.0.1 – 10.251.7.25410.251.7.255
3410.251.8.0/2110.251.8.1 – 10.251.15.25410.251.15.255
3510.251.16.0/2110.251.16.1 – 10.251.23.25410.251.23.255
3610.251.24.0/2110.251.24.1 – 10.251.31.25410.251.31.255
3710.251.32.0/2110.251.32.1 – 10.251.39.25410.251.39.255
3810.251.40.0/2110.251.40.1 – 10.251.47.25410.251.47.255
3910.251.48.0/2110.251.48.1 – 10.251.55.25410.251.55.255
4010.251.56.0/2110.251.56.1 – 10.251.63.25410.251.63.255
4110.251.64.0/2110.251.64.1 – 10.251.71.25410.251.71.255
4210.251.72.0/2110.251.72.1 – 10.251.79.25410.251.79.255
4310.251.80.0/2110.251.80.1 – 10.251.87.25410.251.87.255
4410.251.88.0/2110.251.88.1 – 10.251.95.25410.251.95.255
4510.251.96.0/2110.251.96.1 – 10.251.103.25410.251.103.255
4610.251.104.0/2110.251.104.1 – 10.251.111.25410.251.111.255
4710.251.112.0/2110.251.112.1 – 10.251.119.25410.251.119.255
4810.251.120.0/2110.251.120.1 – 10.251.127.25410.251.127.255
4910.251.128.0/2110.251.128.1 – 10.251.135.25410.251.135.255
5010.251.136.0/2110.251.136.1 – 10.251.143.25410.251.143.255
5110.251.144.0/2110.251.144.1 – 10.251.151.25410.251.151.255
5210.251.152.0/2110.251.152.1 – 10.251.159.25410.251.159.255
5310.251.160.0/2110.251.160.1 – 10.251.167.25410.251.167.255
5410.251.168.0/2110.251.168.1 – 10.251.175.25410.251.175.255
5510.251.176.0/2110.251.176.1 – 10.251.183.25410.251.183.255
5610.251.184.0/2110.251.184.1 – 10.251.191.25410.251.191.255
5710.251.192.0/2110.251.192.1 – 10.251.199.25410.251.199.255
5810.251.200.0/2110.251.200.1 – 10.251.207.25410.251.207.255
5910.251.208.0/2110.251.208.1 – 10.251.215.25410.251.215.255
6010.251.216.0/2110.251.216.1 – 10.251.223.25410.251.223.255
6110.251.224.0/2110.251.224.1 – 10.251.231.25410.251.231.255
6210.251.232.0/2110.251.232.1 – 10.251.239.25410.251.239.255
6310.251.240.0/2110.251.240.1 – 10.251.247.25410.251.247.255
6410.251.248.0/2110.251.248.1 – 10.251.255.25410.251.255.255
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 →