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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)10.240.0.0/13
network10.240.0.0/13
broadcast10.247.255.255
first host10.240.0.1
last host10.247.255.254
subnet mask255.248.0.0
wildcard0.7.255.255
addresses524,288
usable hosts524,286
classA
ipcalc 10.240.0.0/13
address00001010.11110000.00000000.00000000
subnet mask11111111.11111000.00000000.00000000
network00001010.11110000.00000000.00000000
broadcast00001010.11110111.11111111.11111111
green = network part, grey = host part
hex0x0af00000
decimal183500800
reverse dns0.0.240.10.in-addr.arpa
ipv4-mapped::ffff:af0:0

/13 split into /19 · 64 subnets

close ×
#networkhost rangebroadcast
110.240.0.0/1910.240.0.1 – 10.240.31.25410.240.31.255
210.240.32.0/1910.240.32.1 – 10.240.63.25410.240.63.255
310.240.64.0/1910.240.64.1 – 10.240.95.25410.240.95.255
410.240.96.0/1910.240.96.1 – 10.240.127.25410.240.127.255
510.240.128.0/1910.240.128.1 – 10.240.159.25410.240.159.255
610.240.160.0/1910.240.160.1 – 10.240.191.25410.240.191.255
710.240.192.0/1910.240.192.1 – 10.240.223.25410.240.223.255
810.240.224.0/1910.240.224.1 – 10.240.255.25410.240.255.255
910.241.0.0/1910.241.0.1 – 10.241.31.25410.241.31.255
1010.241.32.0/1910.241.32.1 – 10.241.63.25410.241.63.255
1110.241.64.0/1910.241.64.1 – 10.241.95.25410.241.95.255
1210.241.96.0/1910.241.96.1 – 10.241.127.25410.241.127.255
1310.241.128.0/1910.241.128.1 – 10.241.159.25410.241.159.255
1410.241.160.0/1910.241.160.1 – 10.241.191.25410.241.191.255
1510.241.192.0/1910.241.192.1 – 10.241.223.25410.241.223.255
1610.241.224.0/1910.241.224.1 – 10.241.255.25410.241.255.255
1710.242.0.0/1910.242.0.1 – 10.242.31.25410.242.31.255
1810.242.32.0/1910.242.32.1 – 10.242.63.25410.242.63.255
1910.242.64.0/1910.242.64.1 – 10.242.95.25410.242.95.255
2010.242.96.0/1910.242.96.1 – 10.242.127.25410.242.127.255
2110.242.128.0/1910.242.128.1 – 10.242.159.25410.242.159.255
2210.242.160.0/1910.242.160.1 – 10.242.191.25410.242.191.255
2310.242.192.0/1910.242.192.1 – 10.242.223.25410.242.223.255
2410.242.224.0/1910.242.224.1 – 10.242.255.25410.242.255.255
2510.243.0.0/1910.243.0.1 – 10.243.31.25410.243.31.255
2610.243.32.0/1910.243.32.1 – 10.243.63.25410.243.63.255
2710.243.64.0/1910.243.64.1 – 10.243.95.25410.243.95.255
2810.243.96.0/1910.243.96.1 – 10.243.127.25410.243.127.255
2910.243.128.0/1910.243.128.1 – 10.243.159.25410.243.159.255
3010.243.160.0/1910.243.160.1 – 10.243.191.25410.243.191.255
3110.243.192.0/1910.243.192.1 – 10.243.223.25410.243.223.255
3210.243.224.0/1910.243.224.1 – 10.243.255.25410.243.255.255
3310.244.0.0/1910.244.0.1 – 10.244.31.25410.244.31.255
3410.244.32.0/1910.244.32.1 – 10.244.63.25410.244.63.255
3510.244.64.0/1910.244.64.1 – 10.244.95.25410.244.95.255
3610.244.96.0/1910.244.96.1 – 10.244.127.25410.244.127.255
3710.244.128.0/1910.244.128.1 – 10.244.159.25410.244.159.255
3810.244.160.0/1910.244.160.1 – 10.244.191.25410.244.191.255
3910.244.192.0/1910.244.192.1 – 10.244.223.25410.244.223.255
4010.244.224.0/1910.244.224.1 – 10.244.255.25410.244.255.255
4110.245.0.0/1910.245.0.1 – 10.245.31.25410.245.31.255
4210.245.32.0/1910.245.32.1 – 10.245.63.25410.245.63.255
4310.245.64.0/1910.245.64.1 – 10.245.95.25410.245.95.255
4410.245.96.0/1910.245.96.1 – 10.245.127.25410.245.127.255
4510.245.128.0/1910.245.128.1 – 10.245.159.25410.245.159.255
4610.245.160.0/1910.245.160.1 – 10.245.191.25410.245.191.255
4710.245.192.0/1910.245.192.1 – 10.245.223.25410.245.223.255
4810.245.224.0/1910.245.224.1 – 10.245.255.25410.245.255.255
4910.246.0.0/1910.246.0.1 – 10.246.31.25410.246.31.255
5010.246.32.0/1910.246.32.1 – 10.246.63.25410.246.63.255
5110.246.64.0/1910.246.64.1 – 10.246.95.25410.246.95.255
5210.246.96.0/1910.246.96.1 – 10.246.127.25410.246.127.255
5310.246.128.0/1910.246.128.1 – 10.246.159.25410.246.159.255
5410.246.160.0/1910.246.160.1 – 10.246.191.25410.246.191.255
5510.246.192.0/1910.246.192.1 – 10.246.223.25410.246.223.255
5610.246.224.0/1910.246.224.1 – 10.246.255.25410.246.255.255
5710.247.0.0/1910.247.0.1 – 10.247.31.25410.247.31.255
5810.247.32.0/1910.247.32.1 – 10.247.63.25410.247.63.255
5910.247.64.0/1910.247.64.1 – 10.247.95.25410.247.95.255
6010.247.96.0/1910.247.96.1 – 10.247.127.25410.247.127.255
6110.247.128.0/1910.247.128.1 – 10.247.159.25410.247.159.255
6210.247.160.0/1910.247.160.1 – 10.247.191.25410.247.191.255
6310.247.192.0/1910.247.192.1 – 10.247.223.25410.247.223.255
6410.247.224.0/1910.247.224.1 – 10.247.255.25410.247.255.255
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 →