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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)10.2.64.0/20
network10.2.64.0/20
broadcast10.2.79.255
first host10.2.64.1
last host10.2.79.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.2.64.0/20
address00001010.00000010.01000000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.00000010.01000000.00000000
broadcast00001010.00000010.01001111.11111111
green = network part, grey = host part
hex0x0a024000
decimal167919616
reverse dns0.64.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:4000

/20 split into /26 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.64.0/2610.2.64.1 – 10.2.64.6210.2.64.63
210.2.64.64/2610.2.64.65 – 10.2.64.12610.2.64.127
310.2.64.128/2610.2.64.129 – 10.2.64.19010.2.64.191
410.2.64.192/2610.2.64.193 – 10.2.64.25410.2.64.255
510.2.65.0/2610.2.65.1 – 10.2.65.6210.2.65.63
610.2.65.64/2610.2.65.65 – 10.2.65.12610.2.65.127
710.2.65.128/2610.2.65.129 – 10.2.65.19010.2.65.191
810.2.65.192/2610.2.65.193 – 10.2.65.25410.2.65.255
910.2.66.0/2610.2.66.1 – 10.2.66.6210.2.66.63
1010.2.66.64/2610.2.66.65 – 10.2.66.12610.2.66.127
1110.2.66.128/2610.2.66.129 – 10.2.66.19010.2.66.191
1210.2.66.192/2610.2.66.193 – 10.2.66.25410.2.66.255
1310.2.67.0/2610.2.67.1 – 10.2.67.6210.2.67.63
1410.2.67.64/2610.2.67.65 – 10.2.67.12610.2.67.127
1510.2.67.128/2610.2.67.129 – 10.2.67.19010.2.67.191
1610.2.67.192/2610.2.67.193 – 10.2.67.25410.2.67.255
1710.2.68.0/2610.2.68.1 – 10.2.68.6210.2.68.63
1810.2.68.64/2610.2.68.65 – 10.2.68.12610.2.68.127
1910.2.68.128/2610.2.68.129 – 10.2.68.19010.2.68.191
2010.2.68.192/2610.2.68.193 – 10.2.68.25410.2.68.255
2110.2.69.0/2610.2.69.1 – 10.2.69.6210.2.69.63
2210.2.69.64/2610.2.69.65 – 10.2.69.12610.2.69.127
2310.2.69.128/2610.2.69.129 – 10.2.69.19010.2.69.191
2410.2.69.192/2610.2.69.193 – 10.2.69.25410.2.69.255
2510.2.70.0/2610.2.70.1 – 10.2.70.6210.2.70.63
2610.2.70.64/2610.2.70.65 – 10.2.70.12610.2.70.127
2710.2.70.128/2610.2.70.129 – 10.2.70.19010.2.70.191
2810.2.70.192/2610.2.70.193 – 10.2.70.25410.2.70.255
2910.2.71.0/2610.2.71.1 – 10.2.71.6210.2.71.63
3010.2.71.64/2610.2.71.65 – 10.2.71.12610.2.71.127
3110.2.71.128/2610.2.71.129 – 10.2.71.19010.2.71.191
3210.2.71.192/2610.2.71.193 – 10.2.71.25410.2.71.255
3310.2.72.0/2610.2.72.1 – 10.2.72.6210.2.72.63
3410.2.72.64/2610.2.72.65 – 10.2.72.12610.2.72.127
3510.2.72.128/2610.2.72.129 – 10.2.72.19010.2.72.191
3610.2.72.192/2610.2.72.193 – 10.2.72.25410.2.72.255
3710.2.73.0/2610.2.73.1 – 10.2.73.6210.2.73.63
3810.2.73.64/2610.2.73.65 – 10.2.73.12610.2.73.127
3910.2.73.128/2610.2.73.129 – 10.2.73.19010.2.73.191
4010.2.73.192/2610.2.73.193 – 10.2.73.25410.2.73.255
4110.2.74.0/2610.2.74.1 – 10.2.74.6210.2.74.63
4210.2.74.64/2610.2.74.65 – 10.2.74.12610.2.74.127
4310.2.74.128/2610.2.74.129 – 10.2.74.19010.2.74.191
4410.2.74.192/2610.2.74.193 – 10.2.74.25410.2.74.255
4510.2.75.0/2610.2.75.1 – 10.2.75.6210.2.75.63
4610.2.75.64/2610.2.75.65 – 10.2.75.12610.2.75.127
4710.2.75.128/2610.2.75.129 – 10.2.75.19010.2.75.191
4810.2.75.192/2610.2.75.193 – 10.2.75.25410.2.75.255
4910.2.76.0/2610.2.76.1 – 10.2.76.6210.2.76.63
5010.2.76.64/2610.2.76.65 – 10.2.76.12610.2.76.127
5110.2.76.128/2610.2.76.129 – 10.2.76.19010.2.76.191
5210.2.76.192/2610.2.76.193 – 10.2.76.25410.2.76.255
5310.2.77.0/2610.2.77.1 – 10.2.77.6210.2.77.63
5410.2.77.64/2610.2.77.65 – 10.2.77.12610.2.77.127
5510.2.77.128/2610.2.77.129 – 10.2.77.19010.2.77.191
5610.2.77.192/2610.2.77.193 – 10.2.77.25410.2.77.255
5710.2.78.0/2610.2.78.1 – 10.2.78.6210.2.78.63
5810.2.78.64/2610.2.78.65 – 10.2.78.12610.2.78.127
5910.2.78.128/2610.2.78.129 – 10.2.78.19010.2.78.191
6010.2.78.192/2610.2.78.193 – 10.2.78.25410.2.78.255
6110.2.79.0/2610.2.79.1 – 10.2.79.6210.2.79.63
6210.2.79.64/2610.2.79.65 – 10.2.79.12610.2.79.127
6310.2.79.128/2610.2.79.129 – 10.2.79.19010.2.79.191
6410.2.79.192/2610.2.79.193 – 10.2.79.25410.2.79.255
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 →