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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)10.1.160.0/20
network10.1.160.0/20
broadcast10.1.175.255
first host10.1.160.1
last host10.1.175.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.1.160.0/20
address00001010.00000001.10100000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.00000001.10100000.00000000
broadcast00001010.00000001.10101111.11111111
green = network part, grey = host part
hex0x0a01a000
decimal167878656
reverse dns0.160.1.10.in-addr.arpa
ipv4-mapped::ffff:a01:a000

/20 split into /25 · 32 subnets

close ×
#networkhost rangebroadcast
110.1.160.0/2510.1.160.1 – 10.1.160.12610.1.160.127
210.1.160.128/2510.1.160.129 – 10.1.160.25410.1.160.255
310.1.161.0/2510.1.161.1 – 10.1.161.12610.1.161.127
410.1.161.128/2510.1.161.129 – 10.1.161.25410.1.161.255
510.1.162.0/2510.1.162.1 – 10.1.162.12610.1.162.127
610.1.162.128/2510.1.162.129 – 10.1.162.25410.1.162.255
710.1.163.0/2510.1.163.1 – 10.1.163.12610.1.163.127
810.1.163.128/2510.1.163.129 – 10.1.163.25410.1.163.255
910.1.164.0/2510.1.164.1 – 10.1.164.12610.1.164.127
1010.1.164.128/2510.1.164.129 – 10.1.164.25410.1.164.255
1110.1.165.0/2510.1.165.1 – 10.1.165.12610.1.165.127
1210.1.165.128/2510.1.165.129 – 10.1.165.25410.1.165.255
1310.1.166.0/2510.1.166.1 – 10.1.166.12610.1.166.127
1410.1.166.128/2510.1.166.129 – 10.1.166.25410.1.166.255
1510.1.167.0/2510.1.167.1 – 10.1.167.12610.1.167.127
1610.1.167.128/2510.1.167.129 – 10.1.167.25410.1.167.255
1710.1.168.0/2510.1.168.1 – 10.1.168.12610.1.168.127
1810.1.168.128/2510.1.168.129 – 10.1.168.25410.1.168.255
1910.1.169.0/2510.1.169.1 – 10.1.169.12610.1.169.127
2010.1.169.128/2510.1.169.129 – 10.1.169.25410.1.169.255
2110.1.170.0/2510.1.170.1 – 10.1.170.12610.1.170.127
2210.1.170.128/2510.1.170.129 – 10.1.170.25410.1.170.255
2310.1.171.0/2510.1.171.1 – 10.1.171.12610.1.171.127
2410.1.171.128/2510.1.171.129 – 10.1.171.25410.1.171.255
2510.1.172.0/2510.1.172.1 – 10.1.172.12610.1.172.127
2610.1.172.128/2510.1.172.129 – 10.1.172.25410.1.172.255
2710.1.173.0/2510.1.173.1 – 10.1.173.12610.1.173.127
2810.1.173.128/2510.1.173.129 – 10.1.173.25410.1.173.255
2910.1.174.0/2510.1.174.1 – 10.1.174.12610.1.174.127
3010.1.174.128/2510.1.174.129 – 10.1.174.25410.1.174.255
3110.1.175.0/2510.1.175.1 – 10.1.175.12610.1.175.127
3210.1.175.128/2510.1.175.129 – 10.1.175.25410.1.175.255
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 →