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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)10.204.0.0/15
network10.204.0.0/15
broadcast10.205.255.255
first host10.204.0.1
last host10.205.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.204.0.0/15
address00001010.11001100.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.11001100.00000000.00000000
broadcast00001010.11001101.11111111.11111111
green = network part, grey = host part
hex0x0acc0000
decimal181141504
reverse dns0.0.204.10.in-addr.arpa
ipv4-mapped::ffff:acc:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.204.0.0/2110.204.0.1 – 10.204.7.25410.204.7.255
210.204.8.0/2110.204.8.1 – 10.204.15.25410.204.15.255
310.204.16.0/2110.204.16.1 – 10.204.23.25410.204.23.255
410.204.24.0/2110.204.24.1 – 10.204.31.25410.204.31.255
510.204.32.0/2110.204.32.1 – 10.204.39.25410.204.39.255
610.204.40.0/2110.204.40.1 – 10.204.47.25410.204.47.255
710.204.48.0/2110.204.48.1 – 10.204.55.25410.204.55.255
810.204.56.0/2110.204.56.1 – 10.204.63.25410.204.63.255
910.204.64.0/2110.204.64.1 – 10.204.71.25410.204.71.255
1010.204.72.0/2110.204.72.1 – 10.204.79.25410.204.79.255
1110.204.80.0/2110.204.80.1 – 10.204.87.25410.204.87.255
1210.204.88.0/2110.204.88.1 – 10.204.95.25410.204.95.255
1310.204.96.0/2110.204.96.1 – 10.204.103.25410.204.103.255
1410.204.104.0/2110.204.104.1 – 10.204.111.25410.204.111.255
1510.204.112.0/2110.204.112.1 – 10.204.119.25410.204.119.255
1610.204.120.0/2110.204.120.1 – 10.204.127.25410.204.127.255
1710.204.128.0/2110.204.128.1 – 10.204.135.25410.204.135.255
1810.204.136.0/2110.204.136.1 – 10.204.143.25410.204.143.255
1910.204.144.0/2110.204.144.1 – 10.204.151.25410.204.151.255
2010.204.152.0/2110.204.152.1 – 10.204.159.25410.204.159.255
2110.204.160.0/2110.204.160.1 – 10.204.167.25410.204.167.255
2210.204.168.0/2110.204.168.1 – 10.204.175.25410.204.175.255
2310.204.176.0/2110.204.176.1 – 10.204.183.25410.204.183.255
2410.204.184.0/2110.204.184.1 – 10.204.191.25410.204.191.255
2510.204.192.0/2110.204.192.1 – 10.204.199.25410.204.199.255
2610.204.200.0/2110.204.200.1 – 10.204.207.25410.204.207.255
2710.204.208.0/2110.204.208.1 – 10.204.215.25410.204.215.255
2810.204.216.0/2110.204.216.1 – 10.204.223.25410.204.223.255
2910.204.224.0/2110.204.224.1 – 10.204.231.25410.204.231.255
3010.204.232.0/2110.204.232.1 – 10.204.239.25410.204.239.255
3110.204.240.0/2110.204.240.1 – 10.204.247.25410.204.247.255
3210.204.248.0/2110.204.248.1 – 10.204.255.25410.204.255.255
3310.205.0.0/2110.205.0.1 – 10.205.7.25410.205.7.255
3410.205.8.0/2110.205.8.1 – 10.205.15.25410.205.15.255
3510.205.16.0/2110.205.16.1 – 10.205.23.25410.205.23.255
3610.205.24.0/2110.205.24.1 – 10.205.31.25410.205.31.255
3710.205.32.0/2110.205.32.1 – 10.205.39.25410.205.39.255
3810.205.40.0/2110.205.40.1 – 10.205.47.25410.205.47.255
3910.205.48.0/2110.205.48.1 – 10.205.55.25410.205.55.255
4010.205.56.0/2110.205.56.1 – 10.205.63.25410.205.63.255
4110.205.64.0/2110.205.64.1 – 10.205.71.25410.205.71.255
4210.205.72.0/2110.205.72.1 – 10.205.79.25410.205.79.255
4310.205.80.0/2110.205.80.1 – 10.205.87.25410.205.87.255
4410.205.88.0/2110.205.88.1 – 10.205.95.25410.205.95.255
4510.205.96.0/2110.205.96.1 – 10.205.103.25410.205.103.255
4610.205.104.0/2110.205.104.1 – 10.205.111.25410.205.111.255
4710.205.112.0/2110.205.112.1 – 10.205.119.25410.205.119.255
4810.205.120.0/2110.205.120.1 – 10.205.127.25410.205.127.255
4910.205.128.0/2110.205.128.1 – 10.205.135.25410.205.135.255
5010.205.136.0/2110.205.136.1 – 10.205.143.25410.205.143.255
5110.205.144.0/2110.205.144.1 – 10.205.151.25410.205.151.255
5210.205.152.0/2110.205.152.1 – 10.205.159.25410.205.159.255
5310.205.160.0/2110.205.160.1 – 10.205.167.25410.205.167.255
5410.205.168.0/2110.205.168.1 – 10.205.175.25410.205.175.255
5510.205.176.0/2110.205.176.1 – 10.205.183.25410.205.183.255
5610.205.184.0/2110.205.184.1 – 10.205.191.25410.205.191.255
5710.205.192.0/2110.205.192.1 – 10.205.199.25410.205.199.255
5810.205.200.0/2110.205.200.1 – 10.205.207.25410.205.207.255
5910.205.208.0/2110.205.208.1 – 10.205.215.25410.205.215.255
6010.205.216.0/2110.205.216.1 – 10.205.223.25410.205.223.255
6110.205.224.0/2110.205.224.1 – 10.205.231.25410.205.231.255
6210.205.232.0/2110.205.232.1 – 10.205.239.25410.205.239.255
6310.205.240.0/2110.205.240.1 – 10.205.247.25410.205.247.255
6410.205.248.0/2110.205.248.1 – 10.205.255.25410.205.255.255
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 →