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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)10.0.0.0/8
network10.0.0.0/8
broadcast10.255.255.255
first host10.0.0.1
last host10.255.255.254
subnet mask255.0.0.0
wildcard0.255.255.255
addresses16,777,216
usable hosts16,777,214
classA
ipcalc 10.0.0.0/8
address00001010.00000000.00000000.00000000
subnet mask11111111.00000000.00000000.00000000
network00001010.00000000.00000000.00000000
broadcast00001010.11111111.11111111.11111111
green = network part, grey = host part
hex0x0a000000
decimal167772160
reverse dns0.0.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:0

/8 split into /12 · 16 subnets

close ×
#networkhost rangebroadcast
110.0.0.0/1210.0.0.1 – 10.15.255.25410.15.255.255
210.16.0.0/1210.16.0.1 – 10.31.255.25410.31.255.255
310.32.0.0/1210.32.0.1 – 10.47.255.25410.47.255.255
410.48.0.0/1210.48.0.1 – 10.63.255.25410.63.255.255
510.64.0.0/1210.64.0.1 – 10.79.255.25410.79.255.255
610.80.0.0/1210.80.0.1 – 10.95.255.25410.95.255.255
710.96.0.0/1210.96.0.1 – 10.111.255.25410.111.255.255
810.112.0.0/1210.112.0.1 – 10.127.255.25410.127.255.255
910.128.0.0/1210.128.0.1 – 10.143.255.25410.143.255.255
1010.144.0.0/1210.144.0.1 – 10.159.255.25410.159.255.255
1110.160.0.0/1210.160.0.1 – 10.175.255.25410.175.255.255
1210.176.0.0/1210.176.0.1 – 10.191.255.25410.191.255.255
1310.192.0.0/1210.192.0.1 – 10.207.255.25410.207.255.255
1410.208.0.0/1210.208.0.1 – 10.223.255.25410.223.255.255
1510.224.0.0/1210.224.0.1 – 10.239.255.25410.239.255.255
1610.240.0.0/1210.240.0.1 – 10.255.255.25410.255.255.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /8
/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-
/8255.0.0.016,777,21616,777,2141
/9255.128.0.08,388,6088,388,6062 split →
/10255.192.0.04,194,3044,194,3024 split →
/11255.224.0.02,097,1522,097,1508 split →
/12255.240.0.01,048,5761,048,57416 split →
/13255.248.0.0524,288524,28632 split →
/14255.252.0.0262,144262,14264 split →
/15255.254.0.0131,072131,070128 split →
/16255.255.0.065,53665,534256 split →
/17255.255.128.032,76832,766512 split →
/18255.255.192.016,38416,3821,024 split →
/19255.255.224.08,1928,1902,048 split →
/20255.255.240.04,0964,0944,096 split →
/21255.255.248.02,0482,0468,192 split →
/22255.255.252.01,0241,02216,384 split →
/23255.255.254.051251032,768 split →
/24255.255.255.025625465,536 split →
/25255.255.255.128128126131,072 split →
/26255.255.255.1926462262,144 split →
/27255.255.255.2243230524,288 split →
/28255.255.255.24016141,048,576 split →
/29255.255.255.248862,097,152 split →
/30255.255.255.252424,194,304 split →
/31255.255.255.254228,388,608 split →
/32255.255.255.2551116,777,216 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 →