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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)10.206.0.0/15
network10.206.0.0/15
broadcast10.207.255.255
first host10.206.0.1
last host10.207.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.206.0.0/15
address00001010.11001110.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.11001110.00000000.00000000
broadcast00001010.11001111.11111111.11111111
green = network part, grey = host part
hex0x0ace0000
decimal181272576
reverse dns0.0.206.10.in-addr.arpa
ipv4-mapped::ffff:ace:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.206.0.0/2110.206.0.1 – 10.206.7.25410.206.7.255
210.206.8.0/2110.206.8.1 – 10.206.15.25410.206.15.255
310.206.16.0/2110.206.16.1 – 10.206.23.25410.206.23.255
410.206.24.0/2110.206.24.1 – 10.206.31.25410.206.31.255
510.206.32.0/2110.206.32.1 – 10.206.39.25410.206.39.255
610.206.40.0/2110.206.40.1 – 10.206.47.25410.206.47.255
710.206.48.0/2110.206.48.1 – 10.206.55.25410.206.55.255
810.206.56.0/2110.206.56.1 – 10.206.63.25410.206.63.255
910.206.64.0/2110.206.64.1 – 10.206.71.25410.206.71.255
1010.206.72.0/2110.206.72.1 – 10.206.79.25410.206.79.255
1110.206.80.0/2110.206.80.1 – 10.206.87.25410.206.87.255
1210.206.88.0/2110.206.88.1 – 10.206.95.25410.206.95.255
1310.206.96.0/2110.206.96.1 – 10.206.103.25410.206.103.255
1410.206.104.0/2110.206.104.1 – 10.206.111.25410.206.111.255
1510.206.112.0/2110.206.112.1 – 10.206.119.25410.206.119.255
1610.206.120.0/2110.206.120.1 – 10.206.127.25410.206.127.255
1710.206.128.0/2110.206.128.1 – 10.206.135.25410.206.135.255
1810.206.136.0/2110.206.136.1 – 10.206.143.25410.206.143.255
1910.206.144.0/2110.206.144.1 – 10.206.151.25410.206.151.255
2010.206.152.0/2110.206.152.1 – 10.206.159.25410.206.159.255
2110.206.160.0/2110.206.160.1 – 10.206.167.25410.206.167.255
2210.206.168.0/2110.206.168.1 – 10.206.175.25410.206.175.255
2310.206.176.0/2110.206.176.1 – 10.206.183.25410.206.183.255
2410.206.184.0/2110.206.184.1 – 10.206.191.25410.206.191.255
2510.206.192.0/2110.206.192.1 – 10.206.199.25410.206.199.255
2610.206.200.0/2110.206.200.1 – 10.206.207.25410.206.207.255
2710.206.208.0/2110.206.208.1 – 10.206.215.25410.206.215.255
2810.206.216.0/2110.206.216.1 – 10.206.223.25410.206.223.255
2910.206.224.0/2110.206.224.1 – 10.206.231.25410.206.231.255
3010.206.232.0/2110.206.232.1 – 10.206.239.25410.206.239.255
3110.206.240.0/2110.206.240.1 – 10.206.247.25410.206.247.255
3210.206.248.0/2110.206.248.1 – 10.206.255.25410.206.255.255
3310.207.0.0/2110.207.0.1 – 10.207.7.25410.207.7.255
3410.207.8.0/2110.207.8.1 – 10.207.15.25410.207.15.255
3510.207.16.0/2110.207.16.1 – 10.207.23.25410.207.23.255
3610.207.24.0/2110.207.24.1 – 10.207.31.25410.207.31.255
3710.207.32.0/2110.207.32.1 – 10.207.39.25410.207.39.255
3810.207.40.0/2110.207.40.1 – 10.207.47.25410.207.47.255
3910.207.48.0/2110.207.48.1 – 10.207.55.25410.207.55.255
4010.207.56.0/2110.207.56.1 – 10.207.63.25410.207.63.255
4110.207.64.0/2110.207.64.1 – 10.207.71.25410.207.71.255
4210.207.72.0/2110.207.72.1 – 10.207.79.25410.207.79.255
4310.207.80.0/2110.207.80.1 – 10.207.87.25410.207.87.255
4410.207.88.0/2110.207.88.1 – 10.207.95.25410.207.95.255
4510.207.96.0/2110.207.96.1 – 10.207.103.25410.207.103.255
4610.207.104.0/2110.207.104.1 – 10.207.111.25410.207.111.255
4710.207.112.0/2110.207.112.1 – 10.207.119.25410.207.119.255
4810.207.120.0/2110.207.120.1 – 10.207.127.25410.207.127.255
4910.207.128.0/2110.207.128.1 – 10.207.135.25410.207.135.255
5010.207.136.0/2110.207.136.1 – 10.207.143.25410.207.143.255
5110.207.144.0/2110.207.144.1 – 10.207.151.25410.207.151.255
5210.207.152.0/2110.207.152.1 – 10.207.159.25410.207.159.255
5310.207.160.0/2110.207.160.1 – 10.207.167.25410.207.167.255
5410.207.168.0/2110.207.168.1 – 10.207.175.25410.207.175.255
5510.207.176.0/2110.207.176.1 – 10.207.183.25410.207.183.255
5610.207.184.0/2110.207.184.1 – 10.207.191.25410.207.191.255
5710.207.192.0/2110.207.192.1 – 10.207.199.25410.207.199.255
5810.207.200.0/2110.207.200.1 – 10.207.207.25410.207.207.255
5910.207.208.0/2110.207.208.1 – 10.207.215.25410.207.215.255
6010.207.216.0/2110.207.216.1 – 10.207.223.25410.207.223.255
6110.207.224.0/2110.207.224.1 – 10.207.231.25410.207.231.255
6210.207.232.0/2110.207.232.1 – 10.207.239.25410.207.239.255
6310.207.240.0/2110.207.240.1 – 10.207.247.25410.207.247.255
6410.207.248.0/2110.207.248.1 – 10.207.255.25410.207.255.255
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 →