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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)10.168.0.0/15
network10.168.0.0/15
broadcast10.169.255.255
first host10.168.0.1
last host10.169.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.168.0.0/15
address00001010.10101000.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.10101000.00000000.00000000
broadcast00001010.10101001.11111111.11111111
green = network part, grey = host part
hex0x0aa80000
decimal178782208
reverse dns0.0.168.10.in-addr.arpa
ipv4-mapped::ffff:aa8:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.168.0.0/2110.168.0.1 – 10.168.7.25410.168.7.255
210.168.8.0/2110.168.8.1 – 10.168.15.25410.168.15.255
310.168.16.0/2110.168.16.1 – 10.168.23.25410.168.23.255
410.168.24.0/2110.168.24.1 – 10.168.31.25410.168.31.255
510.168.32.0/2110.168.32.1 – 10.168.39.25410.168.39.255
610.168.40.0/2110.168.40.1 – 10.168.47.25410.168.47.255
710.168.48.0/2110.168.48.1 – 10.168.55.25410.168.55.255
810.168.56.0/2110.168.56.1 – 10.168.63.25410.168.63.255
910.168.64.0/2110.168.64.1 – 10.168.71.25410.168.71.255
1010.168.72.0/2110.168.72.1 – 10.168.79.25410.168.79.255
1110.168.80.0/2110.168.80.1 – 10.168.87.25410.168.87.255
1210.168.88.0/2110.168.88.1 – 10.168.95.25410.168.95.255
1310.168.96.0/2110.168.96.1 – 10.168.103.25410.168.103.255
1410.168.104.0/2110.168.104.1 – 10.168.111.25410.168.111.255
1510.168.112.0/2110.168.112.1 – 10.168.119.25410.168.119.255
1610.168.120.0/2110.168.120.1 – 10.168.127.25410.168.127.255
1710.168.128.0/2110.168.128.1 – 10.168.135.25410.168.135.255
1810.168.136.0/2110.168.136.1 – 10.168.143.25410.168.143.255
1910.168.144.0/2110.168.144.1 – 10.168.151.25410.168.151.255
2010.168.152.0/2110.168.152.1 – 10.168.159.25410.168.159.255
2110.168.160.0/2110.168.160.1 – 10.168.167.25410.168.167.255
2210.168.168.0/2110.168.168.1 – 10.168.175.25410.168.175.255
2310.168.176.0/2110.168.176.1 – 10.168.183.25410.168.183.255
2410.168.184.0/2110.168.184.1 – 10.168.191.25410.168.191.255
2510.168.192.0/2110.168.192.1 – 10.168.199.25410.168.199.255
2610.168.200.0/2110.168.200.1 – 10.168.207.25410.168.207.255
2710.168.208.0/2110.168.208.1 – 10.168.215.25410.168.215.255
2810.168.216.0/2110.168.216.1 – 10.168.223.25410.168.223.255
2910.168.224.0/2110.168.224.1 – 10.168.231.25410.168.231.255
3010.168.232.0/2110.168.232.1 – 10.168.239.25410.168.239.255
3110.168.240.0/2110.168.240.1 – 10.168.247.25410.168.247.255
3210.168.248.0/2110.168.248.1 – 10.168.255.25410.168.255.255
3310.169.0.0/2110.169.0.1 – 10.169.7.25410.169.7.255
3410.169.8.0/2110.169.8.1 – 10.169.15.25410.169.15.255
3510.169.16.0/2110.169.16.1 – 10.169.23.25410.169.23.255
3610.169.24.0/2110.169.24.1 – 10.169.31.25410.169.31.255
3710.169.32.0/2110.169.32.1 – 10.169.39.25410.169.39.255
3810.169.40.0/2110.169.40.1 – 10.169.47.25410.169.47.255
3910.169.48.0/2110.169.48.1 – 10.169.55.25410.169.55.255
4010.169.56.0/2110.169.56.1 – 10.169.63.25410.169.63.255
4110.169.64.0/2110.169.64.1 – 10.169.71.25410.169.71.255
4210.169.72.0/2110.169.72.1 – 10.169.79.25410.169.79.255
4310.169.80.0/2110.169.80.1 – 10.169.87.25410.169.87.255
4410.169.88.0/2110.169.88.1 – 10.169.95.25410.169.95.255
4510.169.96.0/2110.169.96.1 – 10.169.103.25410.169.103.255
4610.169.104.0/2110.169.104.1 – 10.169.111.25410.169.111.255
4710.169.112.0/2110.169.112.1 – 10.169.119.25410.169.119.255
4810.169.120.0/2110.169.120.1 – 10.169.127.25410.169.127.255
4910.169.128.0/2110.169.128.1 – 10.169.135.25410.169.135.255
5010.169.136.0/2110.169.136.1 – 10.169.143.25410.169.143.255
5110.169.144.0/2110.169.144.1 – 10.169.151.25410.169.151.255
5210.169.152.0/2110.169.152.1 – 10.169.159.25410.169.159.255
5310.169.160.0/2110.169.160.1 – 10.169.167.25410.169.167.255
5410.169.168.0/2110.169.168.1 – 10.169.175.25410.169.175.255
5510.169.176.0/2110.169.176.1 – 10.169.183.25410.169.183.255
5610.169.184.0/2110.169.184.1 – 10.169.191.25410.169.191.255
5710.169.192.0/2110.169.192.1 – 10.169.199.25410.169.199.255
5810.169.200.0/2110.169.200.1 – 10.169.207.25410.169.207.255
5910.169.208.0/2110.169.208.1 – 10.169.215.25410.169.215.255
6010.169.216.0/2110.169.216.1 – 10.169.223.25410.169.223.255
6110.169.224.0/2110.169.224.1 – 10.169.231.25410.169.231.255
6210.169.232.0/2110.169.232.1 – 10.169.239.25410.169.239.255
6310.169.240.0/2110.169.240.1 – 10.169.247.25410.169.247.255
6410.169.248.0/2110.169.248.1 – 10.169.255.25410.169.255.255
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 →