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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)10.198.0.0/15
network10.198.0.0/15
broadcast10.199.255.255
first host10.198.0.1
last host10.199.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.198.0.0/15
address00001010.11000110.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.11000110.00000000.00000000
broadcast00001010.11000111.11111111.11111111
green = network part, grey = host part
hex0x0ac60000
decimal180748288
reverse dns0.0.198.10.in-addr.arpa
ipv4-mapped::ffff:ac6:0

/15 split into /21 · 64 subnets

close ×
#networkhost rangebroadcast
110.198.0.0/2110.198.0.1 – 10.198.7.25410.198.7.255
210.198.8.0/2110.198.8.1 – 10.198.15.25410.198.15.255
310.198.16.0/2110.198.16.1 – 10.198.23.25410.198.23.255
410.198.24.0/2110.198.24.1 – 10.198.31.25410.198.31.255
510.198.32.0/2110.198.32.1 – 10.198.39.25410.198.39.255
610.198.40.0/2110.198.40.1 – 10.198.47.25410.198.47.255
710.198.48.0/2110.198.48.1 – 10.198.55.25410.198.55.255
810.198.56.0/2110.198.56.1 – 10.198.63.25410.198.63.255
910.198.64.0/2110.198.64.1 – 10.198.71.25410.198.71.255
1010.198.72.0/2110.198.72.1 – 10.198.79.25410.198.79.255
1110.198.80.0/2110.198.80.1 – 10.198.87.25410.198.87.255
1210.198.88.0/2110.198.88.1 – 10.198.95.25410.198.95.255
1310.198.96.0/2110.198.96.1 – 10.198.103.25410.198.103.255
1410.198.104.0/2110.198.104.1 – 10.198.111.25410.198.111.255
1510.198.112.0/2110.198.112.1 – 10.198.119.25410.198.119.255
1610.198.120.0/2110.198.120.1 – 10.198.127.25410.198.127.255
1710.198.128.0/2110.198.128.1 – 10.198.135.25410.198.135.255
1810.198.136.0/2110.198.136.1 – 10.198.143.25410.198.143.255
1910.198.144.0/2110.198.144.1 – 10.198.151.25410.198.151.255
2010.198.152.0/2110.198.152.1 – 10.198.159.25410.198.159.255
2110.198.160.0/2110.198.160.1 – 10.198.167.25410.198.167.255
2210.198.168.0/2110.198.168.1 – 10.198.175.25410.198.175.255
2310.198.176.0/2110.198.176.1 – 10.198.183.25410.198.183.255
2410.198.184.0/2110.198.184.1 – 10.198.191.25410.198.191.255
2510.198.192.0/2110.198.192.1 – 10.198.199.25410.198.199.255
2610.198.200.0/2110.198.200.1 – 10.198.207.25410.198.207.255
2710.198.208.0/2110.198.208.1 – 10.198.215.25410.198.215.255
2810.198.216.0/2110.198.216.1 – 10.198.223.25410.198.223.255
2910.198.224.0/2110.198.224.1 – 10.198.231.25410.198.231.255
3010.198.232.0/2110.198.232.1 – 10.198.239.25410.198.239.255
3110.198.240.0/2110.198.240.1 – 10.198.247.25410.198.247.255
3210.198.248.0/2110.198.248.1 – 10.198.255.25410.198.255.255
3310.199.0.0/2110.199.0.1 – 10.199.7.25410.199.7.255
3410.199.8.0/2110.199.8.1 – 10.199.15.25410.199.15.255
3510.199.16.0/2110.199.16.1 – 10.199.23.25410.199.23.255
3610.199.24.0/2110.199.24.1 – 10.199.31.25410.199.31.255
3710.199.32.0/2110.199.32.1 – 10.199.39.25410.199.39.255
3810.199.40.0/2110.199.40.1 – 10.199.47.25410.199.47.255
3910.199.48.0/2110.199.48.1 – 10.199.55.25410.199.55.255
4010.199.56.0/2110.199.56.1 – 10.199.63.25410.199.63.255
4110.199.64.0/2110.199.64.1 – 10.199.71.25410.199.71.255
4210.199.72.0/2110.199.72.1 – 10.199.79.25410.199.79.255
4310.199.80.0/2110.199.80.1 – 10.199.87.25410.199.87.255
4410.199.88.0/2110.199.88.1 – 10.199.95.25410.199.95.255
4510.199.96.0/2110.199.96.1 – 10.199.103.25410.199.103.255
4610.199.104.0/2110.199.104.1 – 10.199.111.25410.199.111.255
4710.199.112.0/2110.199.112.1 – 10.199.119.25410.199.119.255
4810.199.120.0/2110.199.120.1 – 10.199.127.25410.199.127.255
4910.199.128.0/2110.199.128.1 – 10.199.135.25410.199.135.255
5010.199.136.0/2110.199.136.1 – 10.199.143.25410.199.143.255
5110.199.144.0/2110.199.144.1 – 10.199.151.25410.199.151.255
5210.199.152.0/2110.199.152.1 – 10.199.159.25410.199.159.255
5310.199.160.0/2110.199.160.1 – 10.199.167.25410.199.167.255
5410.199.168.0/2110.199.168.1 – 10.199.175.25410.199.175.255
5510.199.176.0/2110.199.176.1 – 10.199.183.25410.199.183.255
5610.199.184.0/2110.199.184.1 – 10.199.191.25410.199.191.255
5710.199.192.0/2110.199.192.1 – 10.199.199.25410.199.199.255
5810.199.200.0/2110.199.200.1 – 10.199.207.25410.199.207.255
5910.199.208.0/2110.199.208.1 – 10.199.215.25410.199.215.255
6010.199.216.0/2110.199.216.1 – 10.199.223.25410.199.223.255
6110.199.224.0/2110.199.224.1 – 10.199.231.25410.199.231.255
6210.199.232.0/2110.199.232.1 – 10.199.239.25410.199.239.255
6310.199.240.0/2110.199.240.1 – 10.199.247.25410.199.247.255
6410.199.248.0/2110.199.248.1 – 10.199.255.25410.199.255.255
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 →