ip
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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)10.80.0.0/15
network10.80.0.0/15
broadcast10.81.255.255
first host10.80.0.1
last host10.81.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.80.0.0/15
address00001010.01010000.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.01010000.00000000.00000000
broadcast00001010.01010001.11111111.11111111
green = network part, grey = host part
hex0x0a500000
decimal173015040
reverse dns0.0.80.10.in-addr.arpa
ipv4-mapped::ffff:a50:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.80.0.0/2110.80.0.1 – 10.80.7.25410.80.7.255
210.80.8.0/2110.80.8.1 – 10.80.15.25410.80.15.255
310.80.16.0/2110.80.16.1 – 10.80.23.25410.80.23.255
410.80.24.0/2110.80.24.1 – 10.80.31.25410.80.31.255
510.80.32.0/2110.80.32.1 – 10.80.39.25410.80.39.255
610.80.40.0/2110.80.40.1 – 10.80.47.25410.80.47.255
710.80.48.0/2110.80.48.1 – 10.80.55.25410.80.55.255
810.80.56.0/2110.80.56.1 – 10.80.63.25410.80.63.255
910.80.64.0/2110.80.64.1 – 10.80.71.25410.80.71.255
1010.80.72.0/2110.80.72.1 – 10.80.79.25410.80.79.255
1110.80.80.0/2110.80.80.1 – 10.80.87.25410.80.87.255
1210.80.88.0/2110.80.88.1 – 10.80.95.25410.80.95.255
1310.80.96.0/2110.80.96.1 – 10.80.103.25410.80.103.255
1410.80.104.0/2110.80.104.1 – 10.80.111.25410.80.111.255
1510.80.112.0/2110.80.112.1 – 10.80.119.25410.80.119.255
1610.80.120.0/2110.80.120.1 – 10.80.127.25410.80.127.255
1710.80.128.0/2110.80.128.1 – 10.80.135.25410.80.135.255
1810.80.136.0/2110.80.136.1 – 10.80.143.25410.80.143.255
1910.80.144.0/2110.80.144.1 – 10.80.151.25410.80.151.255
2010.80.152.0/2110.80.152.1 – 10.80.159.25410.80.159.255
2110.80.160.0/2110.80.160.1 – 10.80.167.25410.80.167.255
2210.80.168.0/2110.80.168.1 – 10.80.175.25410.80.175.255
2310.80.176.0/2110.80.176.1 – 10.80.183.25410.80.183.255
2410.80.184.0/2110.80.184.1 – 10.80.191.25410.80.191.255
2510.80.192.0/2110.80.192.1 – 10.80.199.25410.80.199.255
2610.80.200.0/2110.80.200.1 – 10.80.207.25410.80.207.255
2710.80.208.0/2110.80.208.1 – 10.80.215.25410.80.215.255
2810.80.216.0/2110.80.216.1 – 10.80.223.25410.80.223.255
2910.80.224.0/2110.80.224.1 – 10.80.231.25410.80.231.255
3010.80.232.0/2110.80.232.1 – 10.80.239.25410.80.239.255
3110.80.240.0/2110.80.240.1 – 10.80.247.25410.80.247.255
3210.80.248.0/2110.80.248.1 – 10.80.255.25410.80.255.255
3310.81.0.0/2110.81.0.1 – 10.81.7.25410.81.7.255
3410.81.8.0/2110.81.8.1 – 10.81.15.25410.81.15.255
3510.81.16.0/2110.81.16.1 – 10.81.23.25410.81.23.255
3610.81.24.0/2110.81.24.1 – 10.81.31.25410.81.31.255
3710.81.32.0/2110.81.32.1 – 10.81.39.25410.81.39.255
3810.81.40.0/2110.81.40.1 – 10.81.47.25410.81.47.255
3910.81.48.0/2110.81.48.1 – 10.81.55.25410.81.55.255
4010.81.56.0/2110.81.56.1 – 10.81.63.25410.81.63.255
4110.81.64.0/2110.81.64.1 – 10.81.71.25410.81.71.255
4210.81.72.0/2110.81.72.1 – 10.81.79.25410.81.79.255
4310.81.80.0/2110.81.80.1 – 10.81.87.25410.81.87.255
4410.81.88.0/2110.81.88.1 – 10.81.95.25410.81.95.255
4510.81.96.0/2110.81.96.1 – 10.81.103.25410.81.103.255
4610.81.104.0/2110.81.104.1 – 10.81.111.25410.81.111.255
4710.81.112.0/2110.81.112.1 – 10.81.119.25410.81.119.255
4810.81.120.0/2110.81.120.1 – 10.81.127.25410.81.127.255
4910.81.128.0/2110.81.128.1 – 10.81.135.25410.81.135.255
5010.81.136.0/2110.81.136.1 – 10.81.143.25410.81.143.255
5110.81.144.0/2110.81.144.1 – 10.81.151.25410.81.151.255
5210.81.152.0/2110.81.152.1 – 10.81.159.25410.81.159.255
5310.81.160.0/2110.81.160.1 – 10.81.167.25410.81.167.255
5410.81.168.0/2110.81.168.1 – 10.81.175.25410.81.175.255
5510.81.176.0/2110.81.176.1 – 10.81.183.25410.81.183.255
5610.81.184.0/2110.81.184.1 – 10.81.191.25410.81.191.255
5710.81.192.0/2110.81.192.1 – 10.81.199.25410.81.199.255
5810.81.200.0/2110.81.200.1 – 10.81.207.25410.81.207.255
5910.81.208.0/2110.81.208.1 – 10.81.215.25410.81.215.255
6010.81.216.0/2110.81.216.1 – 10.81.223.25410.81.223.255
6110.81.224.0/2110.81.224.1 – 10.81.231.25410.81.231.255
6210.81.232.0/2110.81.232.1 – 10.81.239.25410.81.239.255
6310.81.240.0/2110.81.240.1 – 10.81.247.25410.81.247.255
6410.81.248.0/2110.81.248.1 – 10.81.255.25410.81.255.255
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 →