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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)10.8.0.0/15
network10.8.0.0/15
broadcast10.9.255.255
first host10.8.0.1
last host10.9.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.8.0.0/15
address00001010.00001000.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.00001000.00000000.00000000
broadcast00001010.00001001.11111111.11111111
green = network part, grey = host part
hex0x0a080000
decimal168296448
reverse dns0.0.8.10.in-addr.arpa
ipv4-mapped::ffff:a08:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.8.0.0/2110.8.0.1 – 10.8.7.25410.8.7.255
210.8.8.0/2110.8.8.1 – 10.8.15.25410.8.15.255
310.8.16.0/2110.8.16.1 – 10.8.23.25410.8.23.255
410.8.24.0/2110.8.24.1 – 10.8.31.25410.8.31.255
510.8.32.0/2110.8.32.1 – 10.8.39.25410.8.39.255
610.8.40.0/2110.8.40.1 – 10.8.47.25410.8.47.255
710.8.48.0/2110.8.48.1 – 10.8.55.25410.8.55.255
810.8.56.0/2110.8.56.1 – 10.8.63.25410.8.63.255
910.8.64.0/2110.8.64.1 – 10.8.71.25410.8.71.255
1010.8.72.0/2110.8.72.1 – 10.8.79.25410.8.79.255
1110.8.80.0/2110.8.80.1 – 10.8.87.25410.8.87.255
1210.8.88.0/2110.8.88.1 – 10.8.95.25410.8.95.255
1310.8.96.0/2110.8.96.1 – 10.8.103.25410.8.103.255
1410.8.104.0/2110.8.104.1 – 10.8.111.25410.8.111.255
1510.8.112.0/2110.8.112.1 – 10.8.119.25410.8.119.255
1610.8.120.0/2110.8.120.1 – 10.8.127.25410.8.127.255
1710.8.128.0/2110.8.128.1 – 10.8.135.25410.8.135.255
1810.8.136.0/2110.8.136.1 – 10.8.143.25410.8.143.255
1910.8.144.0/2110.8.144.1 – 10.8.151.25410.8.151.255
2010.8.152.0/2110.8.152.1 – 10.8.159.25410.8.159.255
2110.8.160.0/2110.8.160.1 – 10.8.167.25410.8.167.255
2210.8.168.0/2110.8.168.1 – 10.8.175.25410.8.175.255
2310.8.176.0/2110.8.176.1 – 10.8.183.25410.8.183.255
2410.8.184.0/2110.8.184.1 – 10.8.191.25410.8.191.255
2510.8.192.0/2110.8.192.1 – 10.8.199.25410.8.199.255
2610.8.200.0/2110.8.200.1 – 10.8.207.25410.8.207.255
2710.8.208.0/2110.8.208.1 – 10.8.215.25410.8.215.255
2810.8.216.0/2110.8.216.1 – 10.8.223.25410.8.223.255
2910.8.224.0/2110.8.224.1 – 10.8.231.25410.8.231.255
3010.8.232.0/2110.8.232.1 – 10.8.239.25410.8.239.255
3110.8.240.0/2110.8.240.1 – 10.8.247.25410.8.247.255
3210.8.248.0/2110.8.248.1 – 10.8.255.25410.8.255.255
3310.9.0.0/2110.9.0.1 – 10.9.7.25410.9.7.255
3410.9.8.0/2110.9.8.1 – 10.9.15.25410.9.15.255
3510.9.16.0/2110.9.16.1 – 10.9.23.25410.9.23.255
3610.9.24.0/2110.9.24.1 – 10.9.31.25410.9.31.255
3710.9.32.0/2110.9.32.1 – 10.9.39.25410.9.39.255
3810.9.40.0/2110.9.40.1 – 10.9.47.25410.9.47.255
3910.9.48.0/2110.9.48.1 – 10.9.55.25410.9.55.255
4010.9.56.0/2110.9.56.1 – 10.9.63.25410.9.63.255
4110.9.64.0/2110.9.64.1 – 10.9.71.25410.9.71.255
4210.9.72.0/2110.9.72.1 – 10.9.79.25410.9.79.255
4310.9.80.0/2110.9.80.1 – 10.9.87.25410.9.87.255
4410.9.88.0/2110.9.88.1 – 10.9.95.25410.9.95.255
4510.9.96.0/2110.9.96.1 – 10.9.103.25410.9.103.255
4610.9.104.0/2110.9.104.1 – 10.9.111.25410.9.111.255
4710.9.112.0/2110.9.112.1 – 10.9.119.25410.9.119.255
4810.9.120.0/2110.9.120.1 – 10.9.127.25410.9.127.255
4910.9.128.0/2110.9.128.1 – 10.9.135.25410.9.135.255
5010.9.136.0/2110.9.136.1 – 10.9.143.25410.9.143.255
5110.9.144.0/2110.9.144.1 – 10.9.151.25410.9.151.255
5210.9.152.0/2110.9.152.1 – 10.9.159.25410.9.159.255
5310.9.160.0/2110.9.160.1 – 10.9.167.25410.9.167.255
5410.9.168.0/2110.9.168.1 – 10.9.175.25410.9.175.255
5510.9.176.0/2110.9.176.1 – 10.9.183.25410.9.183.255
5610.9.184.0/2110.9.184.1 – 10.9.191.25410.9.191.255
5710.9.192.0/2110.9.192.1 – 10.9.199.25410.9.199.255
5810.9.200.0/2110.9.200.1 – 10.9.207.25410.9.207.255
5910.9.208.0/2110.9.208.1 – 10.9.215.25410.9.215.255
6010.9.216.0/2110.9.216.1 – 10.9.223.25410.9.223.255
6110.9.224.0/2110.9.224.1 – 10.9.231.25410.9.231.255
6210.9.232.0/2110.9.232.1 – 10.9.239.25410.9.239.255
6310.9.240.0/2110.9.240.1 – 10.9.247.25410.9.247.255
6410.9.248.0/2110.9.248.1 – 10.9.255.25410.9.255.255
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 →