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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)10.230.0.0/15
network10.230.0.0/15
broadcast10.231.255.255
first host10.230.0.1
last host10.231.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.230.0.0/15
address00001010.11100110.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.11100110.00000000.00000000
broadcast00001010.11100111.11111111.11111111
green = network part, grey = host part
hex0x0ae60000
decimal182845440
reverse dns0.0.230.10.in-addr.arpa
ipv4-mapped::ffff:ae6:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.230.0.0/2110.230.0.1 – 10.230.7.25410.230.7.255
210.230.8.0/2110.230.8.1 – 10.230.15.25410.230.15.255
310.230.16.0/2110.230.16.1 – 10.230.23.25410.230.23.255
410.230.24.0/2110.230.24.1 – 10.230.31.25410.230.31.255
510.230.32.0/2110.230.32.1 – 10.230.39.25410.230.39.255
610.230.40.0/2110.230.40.1 – 10.230.47.25410.230.47.255
710.230.48.0/2110.230.48.1 – 10.230.55.25410.230.55.255
810.230.56.0/2110.230.56.1 – 10.230.63.25410.230.63.255
910.230.64.0/2110.230.64.1 – 10.230.71.25410.230.71.255
1010.230.72.0/2110.230.72.1 – 10.230.79.25410.230.79.255
1110.230.80.0/2110.230.80.1 – 10.230.87.25410.230.87.255
1210.230.88.0/2110.230.88.1 – 10.230.95.25410.230.95.255
1310.230.96.0/2110.230.96.1 – 10.230.103.25410.230.103.255
1410.230.104.0/2110.230.104.1 – 10.230.111.25410.230.111.255
1510.230.112.0/2110.230.112.1 – 10.230.119.25410.230.119.255
1610.230.120.0/2110.230.120.1 – 10.230.127.25410.230.127.255
1710.230.128.0/2110.230.128.1 – 10.230.135.25410.230.135.255
1810.230.136.0/2110.230.136.1 – 10.230.143.25410.230.143.255
1910.230.144.0/2110.230.144.1 – 10.230.151.25410.230.151.255
2010.230.152.0/2110.230.152.1 – 10.230.159.25410.230.159.255
2110.230.160.0/2110.230.160.1 – 10.230.167.25410.230.167.255
2210.230.168.0/2110.230.168.1 – 10.230.175.25410.230.175.255
2310.230.176.0/2110.230.176.1 – 10.230.183.25410.230.183.255
2410.230.184.0/2110.230.184.1 – 10.230.191.25410.230.191.255
2510.230.192.0/2110.230.192.1 – 10.230.199.25410.230.199.255
2610.230.200.0/2110.230.200.1 – 10.230.207.25410.230.207.255
2710.230.208.0/2110.230.208.1 – 10.230.215.25410.230.215.255
2810.230.216.0/2110.230.216.1 – 10.230.223.25410.230.223.255
2910.230.224.0/2110.230.224.1 – 10.230.231.25410.230.231.255
3010.230.232.0/2110.230.232.1 – 10.230.239.25410.230.239.255
3110.230.240.0/2110.230.240.1 – 10.230.247.25410.230.247.255
3210.230.248.0/2110.230.248.1 – 10.230.255.25410.230.255.255
3310.231.0.0/2110.231.0.1 – 10.231.7.25410.231.7.255
3410.231.8.0/2110.231.8.1 – 10.231.15.25410.231.15.255
3510.231.16.0/2110.231.16.1 – 10.231.23.25410.231.23.255
3610.231.24.0/2110.231.24.1 – 10.231.31.25410.231.31.255
3710.231.32.0/2110.231.32.1 – 10.231.39.25410.231.39.255
3810.231.40.0/2110.231.40.1 – 10.231.47.25410.231.47.255
3910.231.48.0/2110.231.48.1 – 10.231.55.25410.231.55.255
4010.231.56.0/2110.231.56.1 – 10.231.63.25410.231.63.255
4110.231.64.0/2110.231.64.1 – 10.231.71.25410.231.71.255
4210.231.72.0/2110.231.72.1 – 10.231.79.25410.231.79.255
4310.231.80.0/2110.231.80.1 – 10.231.87.25410.231.87.255
4410.231.88.0/2110.231.88.1 – 10.231.95.25410.231.95.255
4510.231.96.0/2110.231.96.1 – 10.231.103.25410.231.103.255
4610.231.104.0/2110.231.104.1 – 10.231.111.25410.231.111.255
4710.231.112.0/2110.231.112.1 – 10.231.119.25410.231.119.255
4810.231.120.0/2110.231.120.1 – 10.231.127.25410.231.127.255
4910.231.128.0/2110.231.128.1 – 10.231.135.25410.231.135.255
5010.231.136.0/2110.231.136.1 – 10.231.143.25410.231.143.255
5110.231.144.0/2110.231.144.1 – 10.231.151.25410.231.151.255
5210.231.152.0/2110.231.152.1 – 10.231.159.25410.231.159.255
5310.231.160.0/2110.231.160.1 – 10.231.167.25410.231.167.255
5410.231.168.0/2110.231.168.1 – 10.231.175.25410.231.175.255
5510.231.176.0/2110.231.176.1 – 10.231.183.25410.231.183.255
5610.231.184.0/2110.231.184.1 – 10.231.191.25410.231.191.255
5710.231.192.0/2110.231.192.1 – 10.231.199.25410.231.199.255
5810.231.200.0/2110.231.200.1 – 10.231.207.25410.231.207.255
5910.231.208.0/2110.231.208.1 – 10.231.215.25410.231.215.255
6010.231.216.0/2110.231.216.1 – 10.231.223.25410.231.223.255
6110.231.224.0/2110.231.224.1 – 10.231.231.25410.231.231.255
6210.231.232.0/2110.231.232.1 – 10.231.239.25410.231.239.255
6310.231.240.0/2110.231.240.1 – 10.231.247.25410.231.247.255
6410.231.248.0/2110.231.248.1 – 10.231.255.25410.231.255.255
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 →