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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)10.128.0.0/13
network10.128.0.0/13
broadcast10.135.255.255
first host10.128.0.1
last host10.135.255.254
subnet mask255.248.0.0
wildcard0.7.255.255
addresses524,288
usable hosts524,286
classA
ipcalc 10.128.0.0/13
address00001010.10000000.00000000.00000000
subnet mask11111111.11111000.00000000.00000000
network00001010.10000000.00000000.00000000
broadcast00001010.10000111.11111111.11111111
green = network part, grey = host part
hex0x0a800000
decimal176160768
reverse dns0.0.128.10.in-addr.arpa
ipv4-mapped::ffff:a80:0

/13 split into /19 · 64 subnets

close ×
#networkhost rangebroadcast
110.128.0.0/1910.128.0.1 – 10.128.31.25410.128.31.255
210.128.32.0/1910.128.32.1 – 10.128.63.25410.128.63.255
310.128.64.0/1910.128.64.1 – 10.128.95.25410.128.95.255
410.128.96.0/1910.128.96.1 – 10.128.127.25410.128.127.255
510.128.128.0/1910.128.128.1 – 10.128.159.25410.128.159.255
610.128.160.0/1910.128.160.1 – 10.128.191.25410.128.191.255
710.128.192.0/1910.128.192.1 – 10.128.223.25410.128.223.255
810.128.224.0/1910.128.224.1 – 10.128.255.25410.128.255.255
910.129.0.0/1910.129.0.1 – 10.129.31.25410.129.31.255
1010.129.32.0/1910.129.32.1 – 10.129.63.25410.129.63.255
1110.129.64.0/1910.129.64.1 – 10.129.95.25410.129.95.255
1210.129.96.0/1910.129.96.1 – 10.129.127.25410.129.127.255
1310.129.128.0/1910.129.128.1 – 10.129.159.25410.129.159.255
1410.129.160.0/1910.129.160.1 – 10.129.191.25410.129.191.255
1510.129.192.0/1910.129.192.1 – 10.129.223.25410.129.223.255
1610.129.224.0/1910.129.224.1 – 10.129.255.25410.129.255.255
1710.130.0.0/1910.130.0.1 – 10.130.31.25410.130.31.255
1810.130.32.0/1910.130.32.1 – 10.130.63.25410.130.63.255
1910.130.64.0/1910.130.64.1 – 10.130.95.25410.130.95.255
2010.130.96.0/1910.130.96.1 – 10.130.127.25410.130.127.255
2110.130.128.0/1910.130.128.1 – 10.130.159.25410.130.159.255
2210.130.160.0/1910.130.160.1 – 10.130.191.25410.130.191.255
2310.130.192.0/1910.130.192.1 – 10.130.223.25410.130.223.255
2410.130.224.0/1910.130.224.1 – 10.130.255.25410.130.255.255
2510.131.0.0/1910.131.0.1 – 10.131.31.25410.131.31.255
2610.131.32.0/1910.131.32.1 – 10.131.63.25410.131.63.255
2710.131.64.0/1910.131.64.1 – 10.131.95.25410.131.95.255
2810.131.96.0/1910.131.96.1 – 10.131.127.25410.131.127.255
2910.131.128.0/1910.131.128.1 – 10.131.159.25410.131.159.255
3010.131.160.0/1910.131.160.1 – 10.131.191.25410.131.191.255
3110.131.192.0/1910.131.192.1 – 10.131.223.25410.131.223.255
3210.131.224.0/1910.131.224.1 – 10.131.255.25410.131.255.255
3310.132.0.0/1910.132.0.1 – 10.132.31.25410.132.31.255
3410.132.32.0/1910.132.32.1 – 10.132.63.25410.132.63.255
3510.132.64.0/1910.132.64.1 – 10.132.95.25410.132.95.255
3610.132.96.0/1910.132.96.1 – 10.132.127.25410.132.127.255
3710.132.128.0/1910.132.128.1 – 10.132.159.25410.132.159.255
3810.132.160.0/1910.132.160.1 – 10.132.191.25410.132.191.255
3910.132.192.0/1910.132.192.1 – 10.132.223.25410.132.223.255
4010.132.224.0/1910.132.224.1 – 10.132.255.25410.132.255.255
4110.133.0.0/1910.133.0.1 – 10.133.31.25410.133.31.255
4210.133.32.0/1910.133.32.1 – 10.133.63.25410.133.63.255
4310.133.64.0/1910.133.64.1 – 10.133.95.25410.133.95.255
4410.133.96.0/1910.133.96.1 – 10.133.127.25410.133.127.255
4510.133.128.0/1910.133.128.1 – 10.133.159.25410.133.159.255
4610.133.160.0/1910.133.160.1 – 10.133.191.25410.133.191.255
4710.133.192.0/1910.133.192.1 – 10.133.223.25410.133.223.255
4810.133.224.0/1910.133.224.1 – 10.133.255.25410.133.255.255
4910.134.0.0/1910.134.0.1 – 10.134.31.25410.134.31.255
5010.134.32.0/1910.134.32.1 – 10.134.63.25410.134.63.255
5110.134.64.0/1910.134.64.1 – 10.134.95.25410.134.95.255
5210.134.96.0/1910.134.96.1 – 10.134.127.25410.134.127.255
5310.134.128.0/1910.134.128.1 – 10.134.159.25410.134.159.255
5410.134.160.0/1910.134.160.1 – 10.134.191.25410.134.191.255
5510.134.192.0/1910.134.192.1 – 10.134.223.25410.134.223.255
5610.134.224.0/1910.134.224.1 – 10.134.255.25410.134.255.255
5710.135.0.0/1910.135.0.1 – 10.135.31.25410.135.31.255
5810.135.32.0/1910.135.32.1 – 10.135.63.25410.135.63.255
5910.135.64.0/1910.135.64.1 – 10.135.95.25410.135.95.255
6010.135.96.0/1910.135.96.1 – 10.135.127.25410.135.127.255
6110.135.128.0/1910.135.128.1 – 10.135.159.25410.135.159.255
6210.135.160.0/1910.135.160.1 – 10.135.191.25410.135.191.255
6310.135.192.0/1910.135.192.1 – 10.135.223.25410.135.223.255
6410.135.224.0/1910.135.224.1 – 10.135.255.25410.135.255.255
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 →