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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)10.10.0.0/15
network10.10.0.0/15
broadcast10.11.255.255
first host10.10.0.1
last host10.11.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.10.0.0/15
address00001010.00001010.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.00001010.00000000.00000000
broadcast00001010.00001011.11111111.11111111
green = network part, grey = host part
hex0x0a0a0000
decimal168427520
reverse dns0.0.10.10.in-addr.arpa
ipv4-mapped::ffff:a0a:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.10.0.0/2110.10.0.1 – 10.10.7.25410.10.7.255
210.10.8.0/2110.10.8.1 – 10.10.15.25410.10.15.255
310.10.16.0/2110.10.16.1 – 10.10.23.25410.10.23.255
410.10.24.0/2110.10.24.1 – 10.10.31.25410.10.31.255
510.10.32.0/2110.10.32.1 – 10.10.39.25410.10.39.255
610.10.40.0/2110.10.40.1 – 10.10.47.25410.10.47.255
710.10.48.0/2110.10.48.1 – 10.10.55.25410.10.55.255
810.10.56.0/2110.10.56.1 – 10.10.63.25410.10.63.255
910.10.64.0/2110.10.64.1 – 10.10.71.25410.10.71.255
1010.10.72.0/2110.10.72.1 – 10.10.79.25410.10.79.255
1110.10.80.0/2110.10.80.1 – 10.10.87.25410.10.87.255
1210.10.88.0/2110.10.88.1 – 10.10.95.25410.10.95.255
1310.10.96.0/2110.10.96.1 – 10.10.103.25410.10.103.255
1410.10.104.0/2110.10.104.1 – 10.10.111.25410.10.111.255
1510.10.112.0/2110.10.112.1 – 10.10.119.25410.10.119.255
1610.10.120.0/2110.10.120.1 – 10.10.127.25410.10.127.255
1710.10.128.0/2110.10.128.1 – 10.10.135.25410.10.135.255
1810.10.136.0/2110.10.136.1 – 10.10.143.25410.10.143.255
1910.10.144.0/2110.10.144.1 – 10.10.151.25410.10.151.255
2010.10.152.0/2110.10.152.1 – 10.10.159.25410.10.159.255
2110.10.160.0/2110.10.160.1 – 10.10.167.25410.10.167.255
2210.10.168.0/2110.10.168.1 – 10.10.175.25410.10.175.255
2310.10.176.0/2110.10.176.1 – 10.10.183.25410.10.183.255
2410.10.184.0/2110.10.184.1 – 10.10.191.25410.10.191.255
2510.10.192.0/2110.10.192.1 – 10.10.199.25410.10.199.255
2610.10.200.0/2110.10.200.1 – 10.10.207.25410.10.207.255
2710.10.208.0/2110.10.208.1 – 10.10.215.25410.10.215.255
2810.10.216.0/2110.10.216.1 – 10.10.223.25410.10.223.255
2910.10.224.0/2110.10.224.1 – 10.10.231.25410.10.231.255
3010.10.232.0/2110.10.232.1 – 10.10.239.25410.10.239.255
3110.10.240.0/2110.10.240.1 – 10.10.247.25410.10.247.255
3210.10.248.0/2110.10.248.1 – 10.10.255.25410.10.255.255
3310.11.0.0/2110.11.0.1 – 10.11.7.25410.11.7.255
3410.11.8.0/2110.11.8.1 – 10.11.15.25410.11.15.255
3510.11.16.0/2110.11.16.1 – 10.11.23.25410.11.23.255
3610.11.24.0/2110.11.24.1 – 10.11.31.25410.11.31.255
3710.11.32.0/2110.11.32.1 – 10.11.39.25410.11.39.255
3810.11.40.0/2110.11.40.1 – 10.11.47.25410.11.47.255
3910.11.48.0/2110.11.48.1 – 10.11.55.25410.11.55.255
4010.11.56.0/2110.11.56.1 – 10.11.63.25410.11.63.255
4110.11.64.0/2110.11.64.1 – 10.11.71.25410.11.71.255
4210.11.72.0/2110.11.72.1 – 10.11.79.25410.11.79.255
4310.11.80.0/2110.11.80.1 – 10.11.87.25410.11.87.255
4410.11.88.0/2110.11.88.1 – 10.11.95.25410.11.95.255
4510.11.96.0/2110.11.96.1 – 10.11.103.25410.11.103.255
4610.11.104.0/2110.11.104.1 – 10.11.111.25410.11.111.255
4710.11.112.0/2110.11.112.1 – 10.11.119.25410.11.119.255
4810.11.120.0/2110.11.120.1 – 10.11.127.25410.11.127.255
4910.11.128.0/2110.11.128.1 – 10.11.135.25410.11.135.255
5010.11.136.0/2110.11.136.1 – 10.11.143.25410.11.143.255
5110.11.144.0/2110.11.144.1 – 10.11.151.25410.11.151.255
5210.11.152.0/2110.11.152.1 – 10.11.159.25410.11.159.255
5310.11.160.0/2110.11.160.1 – 10.11.167.25410.11.167.255
5410.11.168.0/2110.11.168.1 – 10.11.175.25410.11.175.255
5510.11.176.0/2110.11.176.1 – 10.11.183.25410.11.183.255
5610.11.184.0/2110.11.184.1 – 10.11.191.25410.11.191.255
5710.11.192.0/2110.11.192.1 – 10.11.199.25410.11.199.255
5810.11.200.0/2110.11.200.1 – 10.11.207.25410.11.207.255
5910.11.208.0/2110.11.208.1 – 10.11.215.25410.11.215.255
6010.11.216.0/2110.11.216.1 – 10.11.223.25410.11.223.255
6110.11.224.0/2110.11.224.1 – 10.11.231.25410.11.231.255
6210.11.232.0/2110.11.232.1 – 10.11.239.25410.11.239.255
6310.11.240.0/2110.11.240.1 – 10.11.247.25410.11.247.255
6410.11.248.0/2110.11.248.1 – 10.11.255.25410.11.255.255
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 →