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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)10.4.96.0/20
network10.4.96.0/20
broadcast10.4.111.255
first host10.4.96.1
last host10.4.111.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.4.96.0/20
address00001010.00000100.01100000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.00000100.01100000.00000000
broadcast00001010.00000100.01101111.11111111
green = network part, grey = host part
hex0x0a046000
decimal168058880
reverse dns0.96.4.10.in-addr.arpa
ipv4-mapped::ffff:a04:6000

/20 split into /25 · 32 subnets

close ×
#networkhost rangebroadcast
110.4.96.0/2510.4.96.1 – 10.4.96.12610.4.96.127
210.4.96.128/2510.4.96.129 – 10.4.96.25410.4.96.255
310.4.97.0/2510.4.97.1 – 10.4.97.12610.4.97.127
410.4.97.128/2510.4.97.129 – 10.4.97.25410.4.97.255
510.4.98.0/2510.4.98.1 – 10.4.98.12610.4.98.127
610.4.98.128/2510.4.98.129 – 10.4.98.25410.4.98.255
710.4.99.0/2510.4.99.1 – 10.4.99.12610.4.99.127
810.4.99.128/2510.4.99.129 – 10.4.99.25410.4.99.255
910.4.100.0/2510.4.100.1 – 10.4.100.12610.4.100.127
1010.4.100.128/2510.4.100.129 – 10.4.100.25410.4.100.255
1110.4.101.0/2510.4.101.1 – 10.4.101.12610.4.101.127
1210.4.101.128/2510.4.101.129 – 10.4.101.25410.4.101.255
1310.4.102.0/2510.4.102.1 – 10.4.102.12610.4.102.127
1410.4.102.128/2510.4.102.129 – 10.4.102.25410.4.102.255
1510.4.103.0/2510.4.103.1 – 10.4.103.12610.4.103.127
1610.4.103.128/2510.4.103.129 – 10.4.103.25410.4.103.255
1710.4.104.0/2510.4.104.1 – 10.4.104.12610.4.104.127
1810.4.104.128/2510.4.104.129 – 10.4.104.25410.4.104.255
1910.4.105.0/2510.4.105.1 – 10.4.105.12610.4.105.127
2010.4.105.128/2510.4.105.129 – 10.4.105.25410.4.105.255
2110.4.106.0/2510.4.106.1 – 10.4.106.12610.4.106.127
2210.4.106.128/2510.4.106.129 – 10.4.106.25410.4.106.255
2310.4.107.0/2510.4.107.1 – 10.4.107.12610.4.107.127
2410.4.107.128/2510.4.107.129 – 10.4.107.25410.4.107.255
2510.4.108.0/2510.4.108.1 – 10.4.108.12610.4.108.127
2610.4.108.128/2510.4.108.129 – 10.4.108.25410.4.108.255
2710.4.109.0/2510.4.109.1 – 10.4.109.12610.4.109.127
2810.4.109.128/2510.4.109.129 – 10.4.109.25410.4.109.255
2910.4.110.0/2510.4.110.1 – 10.4.110.12610.4.110.127
3010.4.110.128/2510.4.110.129 – 10.4.110.25410.4.110.255
3110.4.111.0/2510.4.111.1 – 10.4.111.12610.4.111.127
3210.4.111.128/2510.4.111.129 – 10.4.111.25410.4.111.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /20
/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-
/13255.248.0.0524,288524,286-
/14255.252.0.0262,144262,142-
/15255.254.0.0131,072131,070-
/16255.255.0.065,53665,534-
/17255.255.128.032,76832,766-
/18255.255.192.016,38416,382-
/19255.255.224.08,1928,190-
/20255.255.240.04,0964,0941
/21255.255.248.02,0482,0462 split →
/22255.255.252.01,0241,0224 split →
/23255.255.254.05125108 split →
/24255.255.255.025625416 split →
/25255.255.255.12812812632 split →
/26255.255.255.192646264 split →
/27255.255.255.2243230128 split →
/28255.255.255.2401614256 split →
/29255.255.255.24886512 split →
/30255.255.255.252421,024 split →
/31255.255.255.254222,048 split →
/32255.255.255.255114,096 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 →