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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)10.120.0.0/13
network10.120.0.0/13
broadcast10.127.255.255
first host10.120.0.1
last host10.127.255.254
subnet mask255.248.0.0
wildcard0.7.255.255
addresses524,288
usable hosts524,286
classA
ipcalc 10.120.0.0/13
address00001010.01111000.00000000.00000000
subnet mask11111111.11111000.00000000.00000000
network00001010.01111000.00000000.00000000
broadcast00001010.01111111.11111111.11111111
green = network part, grey = host part
hex0x0a780000
decimal175636480
reverse dns0.0.120.10.in-addr.arpa
ipv4-mapped::ffff:a78:0

/13 split into /19 · 64 subnets

close ×
#networkhost rangebroadcast
110.120.0.0/1910.120.0.1 – 10.120.31.25410.120.31.255
210.120.32.0/1910.120.32.1 – 10.120.63.25410.120.63.255
310.120.64.0/1910.120.64.1 – 10.120.95.25410.120.95.255
410.120.96.0/1910.120.96.1 – 10.120.127.25410.120.127.255
510.120.128.0/1910.120.128.1 – 10.120.159.25410.120.159.255
610.120.160.0/1910.120.160.1 – 10.120.191.25410.120.191.255
710.120.192.0/1910.120.192.1 – 10.120.223.25410.120.223.255
810.120.224.0/1910.120.224.1 – 10.120.255.25410.120.255.255
910.121.0.0/1910.121.0.1 – 10.121.31.25410.121.31.255
1010.121.32.0/1910.121.32.1 – 10.121.63.25410.121.63.255
1110.121.64.0/1910.121.64.1 – 10.121.95.25410.121.95.255
1210.121.96.0/1910.121.96.1 – 10.121.127.25410.121.127.255
1310.121.128.0/1910.121.128.1 – 10.121.159.25410.121.159.255
1410.121.160.0/1910.121.160.1 – 10.121.191.25410.121.191.255
1510.121.192.0/1910.121.192.1 – 10.121.223.25410.121.223.255
1610.121.224.0/1910.121.224.1 – 10.121.255.25410.121.255.255
1710.122.0.0/1910.122.0.1 – 10.122.31.25410.122.31.255
1810.122.32.0/1910.122.32.1 – 10.122.63.25410.122.63.255
1910.122.64.0/1910.122.64.1 – 10.122.95.25410.122.95.255
2010.122.96.0/1910.122.96.1 – 10.122.127.25410.122.127.255
2110.122.128.0/1910.122.128.1 – 10.122.159.25410.122.159.255
2210.122.160.0/1910.122.160.1 – 10.122.191.25410.122.191.255
2310.122.192.0/1910.122.192.1 – 10.122.223.25410.122.223.255
2410.122.224.0/1910.122.224.1 – 10.122.255.25410.122.255.255
2510.123.0.0/1910.123.0.1 – 10.123.31.25410.123.31.255
2610.123.32.0/1910.123.32.1 – 10.123.63.25410.123.63.255
2710.123.64.0/1910.123.64.1 – 10.123.95.25410.123.95.255
2810.123.96.0/1910.123.96.1 – 10.123.127.25410.123.127.255
2910.123.128.0/1910.123.128.1 – 10.123.159.25410.123.159.255
3010.123.160.0/1910.123.160.1 – 10.123.191.25410.123.191.255
3110.123.192.0/1910.123.192.1 – 10.123.223.25410.123.223.255
3210.123.224.0/1910.123.224.1 – 10.123.255.25410.123.255.255
3310.124.0.0/1910.124.0.1 – 10.124.31.25410.124.31.255
3410.124.32.0/1910.124.32.1 – 10.124.63.25410.124.63.255
3510.124.64.0/1910.124.64.1 – 10.124.95.25410.124.95.255
3610.124.96.0/1910.124.96.1 – 10.124.127.25410.124.127.255
3710.124.128.0/1910.124.128.1 – 10.124.159.25410.124.159.255
3810.124.160.0/1910.124.160.1 – 10.124.191.25410.124.191.255
3910.124.192.0/1910.124.192.1 – 10.124.223.25410.124.223.255
4010.124.224.0/1910.124.224.1 – 10.124.255.25410.124.255.255
4110.125.0.0/1910.125.0.1 – 10.125.31.25410.125.31.255
4210.125.32.0/1910.125.32.1 – 10.125.63.25410.125.63.255
4310.125.64.0/1910.125.64.1 – 10.125.95.25410.125.95.255
4410.125.96.0/1910.125.96.1 – 10.125.127.25410.125.127.255
4510.125.128.0/1910.125.128.1 – 10.125.159.25410.125.159.255
4610.125.160.0/1910.125.160.1 – 10.125.191.25410.125.191.255
4710.125.192.0/1910.125.192.1 – 10.125.223.25410.125.223.255
4810.125.224.0/1910.125.224.1 – 10.125.255.25410.125.255.255
4910.126.0.0/1910.126.0.1 – 10.126.31.25410.126.31.255
5010.126.32.0/1910.126.32.1 – 10.126.63.25410.126.63.255
5110.126.64.0/1910.126.64.1 – 10.126.95.25410.126.95.255
5210.126.96.0/1910.126.96.1 – 10.126.127.25410.126.127.255
5310.126.128.0/1910.126.128.1 – 10.126.159.25410.126.159.255
5410.126.160.0/1910.126.160.1 – 10.126.191.25410.126.191.255
5510.126.192.0/1910.126.192.1 – 10.126.223.25410.126.223.255
5610.126.224.0/1910.126.224.1 – 10.126.255.25410.126.255.255
5710.127.0.0/1910.127.0.1 – 10.127.31.25410.127.31.255
5810.127.32.0/1910.127.32.1 – 10.127.63.25410.127.63.255
5910.127.64.0/1910.127.64.1 – 10.127.95.25410.127.95.255
6010.127.96.0/1910.127.96.1 – 10.127.127.25410.127.127.255
6110.127.128.0/1910.127.128.1 – 10.127.159.25410.127.159.255
6210.127.160.0/1910.127.160.1 – 10.127.191.25410.127.191.255
6310.127.192.0/1910.127.192.1 – 10.127.223.25410.127.223.255
6410.127.224.0/1910.127.224.1 – 10.127.255.25410.127.255.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /13
/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-
/13255.248.0.0524,288524,2861
/14255.252.0.0262,144262,1422 split →
/15255.254.0.0131,072131,0704 split →
/16255.255.0.065,53665,5348 split →
/17255.255.128.032,76832,76616 split →
/18255.255.192.016,38416,38232 split →
/19255.255.224.08,1928,19064 split →
/20255.255.240.04,0964,094128 split →
/21255.255.248.02,0482,046256 split →
/22255.255.252.01,0241,022512 split →
/23255.255.254.05125101,024 split →
/24255.255.255.02562542,048 split →
/25255.255.255.1281281264,096 split →
/26255.255.255.19264628,192 split →
/27255.255.255.224323016,384 split →
/28255.255.255.240161432,768 split →
/29255.255.255.2488665,536 split →
/30255.255.255.25242131,072 split →
/31255.255.255.25422262,144 split →
/32255.255.255.25511524,288 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 →