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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)10.1.224.0/20
network10.1.224.0/20
broadcast10.1.239.255
first host10.1.224.1
last host10.1.239.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.1.224.0/20
address00001010.00000001.11100000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.00000001.11100000.00000000
broadcast00001010.00000001.11101111.11111111
green = network part, grey = host part
hex0x0a01e000
decimal167895040
reverse dns0.224.1.10.in-addr.arpa
ipv4-mapped::ffff:a01:e000

/20 split into /26 · 64 subnets

close ×
#networkhost rangebroadcast
110.1.224.0/2610.1.224.1 – 10.1.224.6210.1.224.63
210.1.224.64/2610.1.224.65 – 10.1.224.12610.1.224.127
310.1.224.128/2610.1.224.129 – 10.1.224.19010.1.224.191
410.1.224.192/2610.1.224.193 – 10.1.224.25410.1.224.255
510.1.225.0/2610.1.225.1 – 10.1.225.6210.1.225.63
610.1.225.64/2610.1.225.65 – 10.1.225.12610.1.225.127
710.1.225.128/2610.1.225.129 – 10.1.225.19010.1.225.191
810.1.225.192/2610.1.225.193 – 10.1.225.25410.1.225.255
910.1.226.0/2610.1.226.1 – 10.1.226.6210.1.226.63
1010.1.226.64/2610.1.226.65 – 10.1.226.12610.1.226.127
1110.1.226.128/2610.1.226.129 – 10.1.226.19010.1.226.191
1210.1.226.192/2610.1.226.193 – 10.1.226.25410.1.226.255
1310.1.227.0/2610.1.227.1 – 10.1.227.6210.1.227.63
1410.1.227.64/2610.1.227.65 – 10.1.227.12610.1.227.127
1510.1.227.128/2610.1.227.129 – 10.1.227.19010.1.227.191
1610.1.227.192/2610.1.227.193 – 10.1.227.25410.1.227.255
1710.1.228.0/2610.1.228.1 – 10.1.228.6210.1.228.63
1810.1.228.64/2610.1.228.65 – 10.1.228.12610.1.228.127
1910.1.228.128/2610.1.228.129 – 10.1.228.19010.1.228.191
2010.1.228.192/2610.1.228.193 – 10.1.228.25410.1.228.255
2110.1.229.0/2610.1.229.1 – 10.1.229.6210.1.229.63
2210.1.229.64/2610.1.229.65 – 10.1.229.12610.1.229.127
2310.1.229.128/2610.1.229.129 – 10.1.229.19010.1.229.191
2410.1.229.192/2610.1.229.193 – 10.1.229.25410.1.229.255
2510.1.230.0/2610.1.230.1 – 10.1.230.6210.1.230.63
2610.1.230.64/2610.1.230.65 – 10.1.230.12610.1.230.127
2710.1.230.128/2610.1.230.129 – 10.1.230.19010.1.230.191
2810.1.230.192/2610.1.230.193 – 10.1.230.25410.1.230.255
2910.1.231.0/2610.1.231.1 – 10.1.231.6210.1.231.63
3010.1.231.64/2610.1.231.65 – 10.1.231.12610.1.231.127
3110.1.231.128/2610.1.231.129 – 10.1.231.19010.1.231.191
3210.1.231.192/2610.1.231.193 – 10.1.231.25410.1.231.255
3310.1.232.0/2610.1.232.1 – 10.1.232.6210.1.232.63
3410.1.232.64/2610.1.232.65 – 10.1.232.12610.1.232.127
3510.1.232.128/2610.1.232.129 – 10.1.232.19010.1.232.191
3610.1.232.192/2610.1.232.193 – 10.1.232.25410.1.232.255
3710.1.233.0/2610.1.233.1 – 10.1.233.6210.1.233.63
3810.1.233.64/2610.1.233.65 – 10.1.233.12610.1.233.127
3910.1.233.128/2610.1.233.129 – 10.1.233.19010.1.233.191
4010.1.233.192/2610.1.233.193 – 10.1.233.25410.1.233.255
4110.1.234.0/2610.1.234.1 – 10.1.234.6210.1.234.63
4210.1.234.64/2610.1.234.65 – 10.1.234.12610.1.234.127
4310.1.234.128/2610.1.234.129 – 10.1.234.19010.1.234.191
4410.1.234.192/2610.1.234.193 – 10.1.234.25410.1.234.255
4510.1.235.0/2610.1.235.1 – 10.1.235.6210.1.235.63
4610.1.235.64/2610.1.235.65 – 10.1.235.12610.1.235.127
4710.1.235.128/2610.1.235.129 – 10.1.235.19010.1.235.191
4810.1.235.192/2610.1.235.193 – 10.1.235.25410.1.235.255
4910.1.236.0/2610.1.236.1 – 10.1.236.6210.1.236.63
5010.1.236.64/2610.1.236.65 – 10.1.236.12610.1.236.127
5110.1.236.128/2610.1.236.129 – 10.1.236.19010.1.236.191
5210.1.236.192/2610.1.236.193 – 10.1.236.25410.1.236.255
5310.1.237.0/2610.1.237.1 – 10.1.237.6210.1.237.63
5410.1.237.64/2610.1.237.65 – 10.1.237.12610.1.237.127
5510.1.237.128/2610.1.237.129 – 10.1.237.19010.1.237.191
5610.1.237.192/2610.1.237.193 – 10.1.237.25410.1.237.255
5710.1.238.0/2610.1.238.1 – 10.1.238.6210.1.238.63
5810.1.238.64/2610.1.238.65 – 10.1.238.12610.1.238.127
5910.1.238.128/2610.1.238.129 – 10.1.238.19010.1.238.191
6010.1.238.192/2610.1.238.193 – 10.1.238.25410.1.238.255
6110.1.239.0/2610.1.239.1 – 10.1.239.6210.1.239.63
6210.1.239.64/2610.1.239.65 – 10.1.239.12610.1.239.127
6310.1.239.128/2610.1.239.129 – 10.1.239.19010.1.239.191
6410.1.239.192/2610.1.239.193 – 10.1.239.25410.1.239.255
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 →