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)10.216.0.0/15
network10.216.0.0/15
broadcast10.217.255.255
first host10.216.0.1
last host10.217.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.216.0.0/15
address00001010.11011000.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.11011000.00000000.00000000
broadcast00001010.11011001.11111111.11111111
green = network part, grey = host part
hex0x0ad80000
decimal181927936
reverse dns0.0.216.10.in-addr.arpa
ipv4-mapped::ffff:ad8:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.216.0.0/2110.216.0.1 – 10.216.7.25410.216.7.255
210.216.8.0/2110.216.8.1 – 10.216.15.25410.216.15.255
310.216.16.0/2110.216.16.1 – 10.216.23.25410.216.23.255
410.216.24.0/2110.216.24.1 – 10.216.31.25410.216.31.255
510.216.32.0/2110.216.32.1 – 10.216.39.25410.216.39.255
610.216.40.0/2110.216.40.1 – 10.216.47.25410.216.47.255
710.216.48.0/2110.216.48.1 – 10.216.55.25410.216.55.255
810.216.56.0/2110.216.56.1 – 10.216.63.25410.216.63.255
910.216.64.0/2110.216.64.1 – 10.216.71.25410.216.71.255
1010.216.72.0/2110.216.72.1 – 10.216.79.25410.216.79.255
1110.216.80.0/2110.216.80.1 – 10.216.87.25410.216.87.255
1210.216.88.0/2110.216.88.1 – 10.216.95.25410.216.95.255
1310.216.96.0/2110.216.96.1 – 10.216.103.25410.216.103.255
1410.216.104.0/2110.216.104.1 – 10.216.111.25410.216.111.255
1510.216.112.0/2110.216.112.1 – 10.216.119.25410.216.119.255
1610.216.120.0/2110.216.120.1 – 10.216.127.25410.216.127.255
1710.216.128.0/2110.216.128.1 – 10.216.135.25410.216.135.255
1810.216.136.0/2110.216.136.1 – 10.216.143.25410.216.143.255
1910.216.144.0/2110.216.144.1 – 10.216.151.25410.216.151.255
2010.216.152.0/2110.216.152.1 – 10.216.159.25410.216.159.255
2110.216.160.0/2110.216.160.1 – 10.216.167.25410.216.167.255
2210.216.168.0/2110.216.168.1 – 10.216.175.25410.216.175.255
2310.216.176.0/2110.216.176.1 – 10.216.183.25410.216.183.255
2410.216.184.0/2110.216.184.1 – 10.216.191.25410.216.191.255
2510.216.192.0/2110.216.192.1 – 10.216.199.25410.216.199.255
2610.216.200.0/2110.216.200.1 – 10.216.207.25410.216.207.255
2710.216.208.0/2110.216.208.1 – 10.216.215.25410.216.215.255
2810.216.216.0/2110.216.216.1 – 10.216.223.25410.216.223.255
2910.216.224.0/2110.216.224.1 – 10.216.231.25410.216.231.255
3010.216.232.0/2110.216.232.1 – 10.216.239.25410.216.239.255
3110.216.240.0/2110.216.240.1 – 10.216.247.25410.216.247.255
3210.216.248.0/2110.216.248.1 – 10.216.255.25410.216.255.255
3310.217.0.0/2110.217.0.1 – 10.217.7.25410.217.7.255
3410.217.8.0/2110.217.8.1 – 10.217.15.25410.217.15.255
3510.217.16.0/2110.217.16.1 – 10.217.23.25410.217.23.255
3610.217.24.0/2110.217.24.1 – 10.217.31.25410.217.31.255
3710.217.32.0/2110.217.32.1 – 10.217.39.25410.217.39.255
3810.217.40.0/2110.217.40.1 – 10.217.47.25410.217.47.255
3910.217.48.0/2110.217.48.1 – 10.217.55.25410.217.55.255
4010.217.56.0/2110.217.56.1 – 10.217.63.25410.217.63.255
4110.217.64.0/2110.217.64.1 – 10.217.71.25410.217.71.255
4210.217.72.0/2110.217.72.1 – 10.217.79.25410.217.79.255
4310.217.80.0/2110.217.80.1 – 10.217.87.25410.217.87.255
4410.217.88.0/2110.217.88.1 – 10.217.95.25410.217.95.255
4510.217.96.0/2110.217.96.1 – 10.217.103.25410.217.103.255
4610.217.104.0/2110.217.104.1 – 10.217.111.25410.217.111.255
4710.217.112.0/2110.217.112.1 – 10.217.119.25410.217.119.255
4810.217.120.0/2110.217.120.1 – 10.217.127.25410.217.127.255
4910.217.128.0/2110.217.128.1 – 10.217.135.25410.217.135.255
5010.217.136.0/2110.217.136.1 – 10.217.143.25410.217.143.255
5110.217.144.0/2110.217.144.1 – 10.217.151.25410.217.151.255
5210.217.152.0/2110.217.152.1 – 10.217.159.25410.217.159.255
5310.217.160.0/2110.217.160.1 – 10.217.167.25410.217.167.255
5410.217.168.0/2110.217.168.1 – 10.217.175.25410.217.175.255
5510.217.176.0/2110.217.176.1 – 10.217.183.25410.217.183.255
5610.217.184.0/2110.217.184.1 – 10.217.191.25410.217.191.255
5710.217.192.0/2110.217.192.1 – 10.217.199.25410.217.199.255
5810.217.200.0/2110.217.200.1 – 10.217.207.25410.217.207.255
5910.217.208.0/2110.217.208.1 – 10.217.215.25410.217.215.255
6010.217.216.0/2110.217.216.1 – 10.217.223.25410.217.223.255
6110.217.224.0/2110.217.224.1 – 10.217.231.25410.217.231.255
6210.217.232.0/2110.217.232.1 – 10.217.239.25410.217.239.255
6310.217.240.0/2110.217.240.1 – 10.217.247.25410.217.247.255
6410.217.248.0/2110.217.248.1 – 10.217.255.25410.217.255.255
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 →