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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)10.239.64.0/20
network10.239.64.0/20
broadcast10.239.79.255
first host10.239.64.1
last host10.239.79.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.239.64.0/20
address00001010.11101111.01000000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.11101111.01000000.00000000
broadcast00001010.11101111.01001111.11111111
green = network part, grey = host part
hex0x0aef4000
decimal183451648
reverse dns0.64.239.10.in-addr.arpa
ipv4-mapped::ffff:aef:4000

/20 split into /26 · 64 subnets

close ×
#networkhost rangebroadcast
110.239.64.0/2610.239.64.1 – 10.239.64.6210.239.64.63
210.239.64.64/2610.239.64.65 – 10.239.64.12610.239.64.127
310.239.64.128/2610.239.64.129 – 10.239.64.19010.239.64.191
410.239.64.192/2610.239.64.193 – 10.239.64.25410.239.64.255
510.239.65.0/2610.239.65.1 – 10.239.65.6210.239.65.63
610.239.65.64/2610.239.65.65 – 10.239.65.12610.239.65.127
710.239.65.128/2610.239.65.129 – 10.239.65.19010.239.65.191
810.239.65.192/2610.239.65.193 – 10.239.65.25410.239.65.255
910.239.66.0/2610.239.66.1 – 10.239.66.6210.239.66.63
1010.239.66.64/2610.239.66.65 – 10.239.66.12610.239.66.127
1110.239.66.128/2610.239.66.129 – 10.239.66.19010.239.66.191
1210.239.66.192/2610.239.66.193 – 10.239.66.25410.239.66.255
1310.239.67.0/2610.239.67.1 – 10.239.67.6210.239.67.63
1410.239.67.64/2610.239.67.65 – 10.239.67.12610.239.67.127
1510.239.67.128/2610.239.67.129 – 10.239.67.19010.239.67.191
1610.239.67.192/2610.239.67.193 – 10.239.67.25410.239.67.255
1710.239.68.0/2610.239.68.1 – 10.239.68.6210.239.68.63
1810.239.68.64/2610.239.68.65 – 10.239.68.12610.239.68.127
1910.239.68.128/2610.239.68.129 – 10.239.68.19010.239.68.191
2010.239.68.192/2610.239.68.193 – 10.239.68.25410.239.68.255
2110.239.69.0/2610.239.69.1 – 10.239.69.6210.239.69.63
2210.239.69.64/2610.239.69.65 – 10.239.69.12610.239.69.127
2310.239.69.128/2610.239.69.129 – 10.239.69.19010.239.69.191
2410.239.69.192/2610.239.69.193 – 10.239.69.25410.239.69.255
2510.239.70.0/2610.239.70.1 – 10.239.70.6210.239.70.63
2610.239.70.64/2610.239.70.65 – 10.239.70.12610.239.70.127
2710.239.70.128/2610.239.70.129 – 10.239.70.19010.239.70.191
2810.239.70.192/2610.239.70.193 – 10.239.70.25410.239.70.255
2910.239.71.0/2610.239.71.1 – 10.239.71.6210.239.71.63
3010.239.71.64/2610.239.71.65 – 10.239.71.12610.239.71.127
3110.239.71.128/2610.239.71.129 – 10.239.71.19010.239.71.191
3210.239.71.192/2610.239.71.193 – 10.239.71.25410.239.71.255
3310.239.72.0/2610.239.72.1 – 10.239.72.6210.239.72.63
3410.239.72.64/2610.239.72.65 – 10.239.72.12610.239.72.127
3510.239.72.128/2610.239.72.129 – 10.239.72.19010.239.72.191
3610.239.72.192/2610.239.72.193 – 10.239.72.25410.239.72.255
3710.239.73.0/2610.239.73.1 – 10.239.73.6210.239.73.63
3810.239.73.64/2610.239.73.65 – 10.239.73.12610.239.73.127
3910.239.73.128/2610.239.73.129 – 10.239.73.19010.239.73.191
4010.239.73.192/2610.239.73.193 – 10.239.73.25410.239.73.255
4110.239.74.0/2610.239.74.1 – 10.239.74.6210.239.74.63
4210.239.74.64/2610.239.74.65 – 10.239.74.12610.239.74.127
4310.239.74.128/2610.239.74.129 – 10.239.74.19010.239.74.191
4410.239.74.192/2610.239.74.193 – 10.239.74.25410.239.74.255
4510.239.75.0/2610.239.75.1 – 10.239.75.6210.239.75.63
4610.239.75.64/2610.239.75.65 – 10.239.75.12610.239.75.127
4710.239.75.128/2610.239.75.129 – 10.239.75.19010.239.75.191
4810.239.75.192/2610.239.75.193 – 10.239.75.25410.239.75.255
4910.239.76.0/2610.239.76.1 – 10.239.76.6210.239.76.63
5010.239.76.64/2610.239.76.65 – 10.239.76.12610.239.76.127
5110.239.76.128/2610.239.76.129 – 10.239.76.19010.239.76.191
5210.239.76.192/2610.239.76.193 – 10.239.76.25410.239.76.255
5310.239.77.0/2610.239.77.1 – 10.239.77.6210.239.77.63
5410.239.77.64/2610.239.77.65 – 10.239.77.12610.239.77.127
5510.239.77.128/2610.239.77.129 – 10.239.77.19010.239.77.191
5610.239.77.192/2610.239.77.193 – 10.239.77.25410.239.77.255
5710.239.78.0/2610.239.78.1 – 10.239.78.6210.239.78.63
5810.239.78.64/2610.239.78.65 – 10.239.78.12610.239.78.127
5910.239.78.128/2610.239.78.129 – 10.239.78.19010.239.78.191
6010.239.78.192/2610.239.78.193 – 10.239.78.25410.239.78.255
6110.239.79.0/2610.239.79.1 – 10.239.79.6210.239.79.63
6210.239.79.64/2610.239.79.65 – 10.239.79.12610.239.79.127
6310.239.79.128/2610.239.79.129 – 10.239.79.19010.239.79.191
6410.239.79.192/2610.239.79.193 – 10.239.79.25410.239.79.255
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 →