ip
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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)10.136.0.0/13
network10.136.0.0/13
broadcast10.143.255.255
first host10.136.0.1
last host10.143.255.254
subnet mask255.248.0.0
wildcard0.7.255.255
addresses524,288
usable hosts524,286
classA
ipcalc 10.136.0.0/13
address00001010.10001000.00000000.00000000
subnet mask11111111.11111000.00000000.00000000
network00001010.10001000.00000000.00000000
broadcast00001010.10001111.11111111.11111111
green = network part, grey = host part
hex0x0a880000
decimal176685056
reverse dns0.0.136.10.in-addr.arpa
ipv4-mapped::ffff:a88:0

/13 split into /18 · 32 subnets

close ×
#networkhost rangebroadcast
110.136.0.0/1810.136.0.1 – 10.136.63.25410.136.63.255
210.136.64.0/1810.136.64.1 – 10.136.127.25410.136.127.255
310.136.128.0/1810.136.128.1 – 10.136.191.25410.136.191.255
410.136.192.0/1810.136.192.1 – 10.136.255.25410.136.255.255
510.137.0.0/1810.137.0.1 – 10.137.63.25410.137.63.255
610.137.64.0/1810.137.64.1 – 10.137.127.25410.137.127.255
710.137.128.0/1810.137.128.1 – 10.137.191.25410.137.191.255
810.137.192.0/1810.137.192.1 – 10.137.255.25410.137.255.255
910.138.0.0/1810.138.0.1 – 10.138.63.25410.138.63.255
1010.138.64.0/1810.138.64.1 – 10.138.127.25410.138.127.255
1110.138.128.0/1810.138.128.1 – 10.138.191.25410.138.191.255
1210.138.192.0/1810.138.192.1 – 10.138.255.25410.138.255.255
1310.139.0.0/1810.139.0.1 – 10.139.63.25410.139.63.255
1410.139.64.0/1810.139.64.1 – 10.139.127.25410.139.127.255
1510.139.128.0/1810.139.128.1 – 10.139.191.25410.139.191.255
1610.139.192.0/1810.139.192.1 – 10.139.255.25410.139.255.255
1710.140.0.0/1810.140.0.1 – 10.140.63.25410.140.63.255
1810.140.64.0/1810.140.64.1 – 10.140.127.25410.140.127.255
1910.140.128.0/1810.140.128.1 – 10.140.191.25410.140.191.255
2010.140.192.0/1810.140.192.1 – 10.140.255.25410.140.255.255
2110.141.0.0/1810.141.0.1 – 10.141.63.25410.141.63.255
2210.141.64.0/1810.141.64.1 – 10.141.127.25410.141.127.255
2310.141.128.0/1810.141.128.1 – 10.141.191.25410.141.191.255
2410.141.192.0/1810.141.192.1 – 10.141.255.25410.141.255.255
2510.142.0.0/1810.142.0.1 – 10.142.63.25410.142.63.255
2610.142.64.0/1810.142.64.1 – 10.142.127.25410.142.127.255
2710.142.128.0/1810.142.128.1 – 10.142.191.25410.142.191.255
2810.142.192.0/1810.142.192.1 – 10.142.255.25410.142.255.255
2910.143.0.0/1810.143.0.1 – 10.143.63.25410.143.63.255
3010.143.64.0/1810.143.64.1 – 10.143.127.25410.143.127.255
3110.143.128.0/1810.143.128.1 – 10.143.191.25410.143.191.255
3210.143.192.0/1810.143.192.1 – 10.143.255.25410.143.255.255
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 →