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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)10.0.64.0/20
network10.0.64.0/20
broadcast10.0.79.255
first host10.0.64.1
last host10.0.79.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.0.64.0/20
address00001010.00000000.01000000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.00000000.01000000.00000000
broadcast00001010.00000000.01001111.11111111
green = network part, grey = host part
hex0x0a004000
decimal167788544
reverse dns0.64.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:4000

/20 split into /26 · 64 subnets

close ×
#networkhost rangebroadcast
110.0.64.0/2610.0.64.1 – 10.0.64.6210.0.64.63
210.0.64.64/2610.0.64.65 – 10.0.64.12610.0.64.127
310.0.64.128/2610.0.64.129 – 10.0.64.19010.0.64.191
410.0.64.192/2610.0.64.193 – 10.0.64.25410.0.64.255
510.0.65.0/2610.0.65.1 – 10.0.65.6210.0.65.63
610.0.65.64/2610.0.65.65 – 10.0.65.12610.0.65.127
710.0.65.128/2610.0.65.129 – 10.0.65.19010.0.65.191
810.0.65.192/2610.0.65.193 – 10.0.65.25410.0.65.255
910.0.66.0/2610.0.66.1 – 10.0.66.6210.0.66.63
1010.0.66.64/2610.0.66.65 – 10.0.66.12610.0.66.127
1110.0.66.128/2610.0.66.129 – 10.0.66.19010.0.66.191
1210.0.66.192/2610.0.66.193 – 10.0.66.25410.0.66.255
1310.0.67.0/2610.0.67.1 – 10.0.67.6210.0.67.63
1410.0.67.64/2610.0.67.65 – 10.0.67.12610.0.67.127
1510.0.67.128/2610.0.67.129 – 10.0.67.19010.0.67.191
1610.0.67.192/2610.0.67.193 – 10.0.67.25410.0.67.255
1710.0.68.0/2610.0.68.1 – 10.0.68.6210.0.68.63
1810.0.68.64/2610.0.68.65 – 10.0.68.12610.0.68.127
1910.0.68.128/2610.0.68.129 – 10.0.68.19010.0.68.191
2010.0.68.192/2610.0.68.193 – 10.0.68.25410.0.68.255
2110.0.69.0/2610.0.69.1 – 10.0.69.6210.0.69.63
2210.0.69.64/2610.0.69.65 – 10.0.69.12610.0.69.127
2310.0.69.128/2610.0.69.129 – 10.0.69.19010.0.69.191
2410.0.69.192/2610.0.69.193 – 10.0.69.25410.0.69.255
2510.0.70.0/2610.0.70.1 – 10.0.70.6210.0.70.63
2610.0.70.64/2610.0.70.65 – 10.0.70.12610.0.70.127
2710.0.70.128/2610.0.70.129 – 10.0.70.19010.0.70.191
2810.0.70.192/2610.0.70.193 – 10.0.70.25410.0.70.255
2910.0.71.0/2610.0.71.1 – 10.0.71.6210.0.71.63
3010.0.71.64/2610.0.71.65 – 10.0.71.12610.0.71.127
3110.0.71.128/2610.0.71.129 – 10.0.71.19010.0.71.191
3210.0.71.192/2610.0.71.193 – 10.0.71.25410.0.71.255
3310.0.72.0/2610.0.72.1 – 10.0.72.6210.0.72.63
3410.0.72.64/2610.0.72.65 – 10.0.72.12610.0.72.127
3510.0.72.128/2610.0.72.129 – 10.0.72.19010.0.72.191
3610.0.72.192/2610.0.72.193 – 10.0.72.25410.0.72.255
3710.0.73.0/2610.0.73.1 – 10.0.73.6210.0.73.63
3810.0.73.64/2610.0.73.65 – 10.0.73.12610.0.73.127
3910.0.73.128/2610.0.73.129 – 10.0.73.19010.0.73.191
4010.0.73.192/2610.0.73.193 – 10.0.73.25410.0.73.255
4110.0.74.0/2610.0.74.1 – 10.0.74.6210.0.74.63
4210.0.74.64/2610.0.74.65 – 10.0.74.12610.0.74.127
4310.0.74.128/2610.0.74.129 – 10.0.74.19010.0.74.191
4410.0.74.192/2610.0.74.193 – 10.0.74.25410.0.74.255
4510.0.75.0/2610.0.75.1 – 10.0.75.6210.0.75.63
4610.0.75.64/2610.0.75.65 – 10.0.75.12610.0.75.127
4710.0.75.128/2610.0.75.129 – 10.0.75.19010.0.75.191
4810.0.75.192/2610.0.75.193 – 10.0.75.25410.0.75.255
4910.0.76.0/2610.0.76.1 – 10.0.76.6210.0.76.63
5010.0.76.64/2610.0.76.65 – 10.0.76.12610.0.76.127
5110.0.76.128/2610.0.76.129 – 10.0.76.19010.0.76.191
5210.0.76.192/2610.0.76.193 – 10.0.76.25410.0.76.255
5310.0.77.0/2610.0.77.1 – 10.0.77.6210.0.77.63
5410.0.77.64/2610.0.77.65 – 10.0.77.12610.0.77.127
5510.0.77.128/2610.0.77.129 – 10.0.77.19010.0.77.191
5610.0.77.192/2610.0.77.193 – 10.0.77.25410.0.77.255
5710.0.78.0/2610.0.78.1 – 10.0.78.6210.0.78.63
5810.0.78.64/2610.0.78.65 – 10.0.78.12610.0.78.127
5910.0.78.128/2610.0.78.129 – 10.0.78.19010.0.78.191
6010.0.78.192/2610.0.78.193 – 10.0.78.25410.0.78.255
6110.0.79.0/2610.0.79.1 – 10.0.79.6210.0.79.63
6210.0.79.64/2610.0.79.65 – 10.0.79.12610.0.79.127
6310.0.79.128/2610.0.79.129 – 10.0.79.19010.0.79.191
6410.0.79.192/2610.0.79.193 – 10.0.79.25410.0.79.255
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 →