ip
ipku.in

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)10.0.0.0/20
network10.0.0.0/20
broadcast10.0.15.255
first host10.0.0.1
last host10.0.15.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.0.0.0/20
address00001010.00000000.00000000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.00000000.00000000.00000000
broadcast00001010.00000000.00001111.11111111
green = network part, grey = host part
hex0x0a000000
decimal167772160
reverse dns0.0.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:0

/20 split into /26 · 64 subnets

close ×
#networkhost rangebroadcast
110.0.0.0/2610.0.0.1 – 10.0.0.6210.0.0.63
210.0.0.64/2610.0.0.65 – 10.0.0.12610.0.0.127
310.0.0.128/2610.0.0.129 – 10.0.0.19010.0.0.191
410.0.0.192/2610.0.0.193 – 10.0.0.25410.0.0.255
510.0.1.0/2610.0.1.1 – 10.0.1.6210.0.1.63
610.0.1.64/2610.0.1.65 – 10.0.1.12610.0.1.127
710.0.1.128/2610.0.1.129 – 10.0.1.19010.0.1.191
810.0.1.192/2610.0.1.193 – 10.0.1.25410.0.1.255
910.0.2.0/2610.0.2.1 – 10.0.2.6210.0.2.63
1010.0.2.64/2610.0.2.65 – 10.0.2.12610.0.2.127
1110.0.2.128/2610.0.2.129 – 10.0.2.19010.0.2.191
1210.0.2.192/2610.0.2.193 – 10.0.2.25410.0.2.255
1310.0.3.0/2610.0.3.1 – 10.0.3.6210.0.3.63
1410.0.3.64/2610.0.3.65 – 10.0.3.12610.0.3.127
1510.0.3.128/2610.0.3.129 – 10.0.3.19010.0.3.191
1610.0.3.192/2610.0.3.193 – 10.0.3.25410.0.3.255
1710.0.4.0/2610.0.4.1 – 10.0.4.6210.0.4.63
1810.0.4.64/2610.0.4.65 – 10.0.4.12610.0.4.127
1910.0.4.128/2610.0.4.129 – 10.0.4.19010.0.4.191
2010.0.4.192/2610.0.4.193 – 10.0.4.25410.0.4.255
2110.0.5.0/2610.0.5.1 – 10.0.5.6210.0.5.63
2210.0.5.64/2610.0.5.65 – 10.0.5.12610.0.5.127
2310.0.5.128/2610.0.5.129 – 10.0.5.19010.0.5.191
2410.0.5.192/2610.0.5.193 – 10.0.5.25410.0.5.255
2510.0.6.0/2610.0.6.1 – 10.0.6.6210.0.6.63
2610.0.6.64/2610.0.6.65 – 10.0.6.12610.0.6.127
2710.0.6.128/2610.0.6.129 – 10.0.6.19010.0.6.191
2810.0.6.192/2610.0.6.193 – 10.0.6.25410.0.6.255
2910.0.7.0/2610.0.7.1 – 10.0.7.6210.0.7.63
3010.0.7.64/2610.0.7.65 – 10.0.7.12610.0.7.127
3110.0.7.128/2610.0.7.129 – 10.0.7.19010.0.7.191
3210.0.7.192/2610.0.7.193 – 10.0.7.25410.0.7.255
3310.0.8.0/2610.0.8.1 – 10.0.8.6210.0.8.63
3410.0.8.64/2610.0.8.65 – 10.0.8.12610.0.8.127
3510.0.8.128/2610.0.8.129 – 10.0.8.19010.0.8.191
3610.0.8.192/2610.0.8.193 – 10.0.8.25410.0.8.255
3710.0.9.0/2610.0.9.1 – 10.0.9.6210.0.9.63
3810.0.9.64/2610.0.9.65 – 10.0.9.12610.0.9.127
3910.0.9.128/2610.0.9.129 – 10.0.9.19010.0.9.191
4010.0.9.192/2610.0.9.193 – 10.0.9.25410.0.9.255
4110.0.10.0/2610.0.10.1 – 10.0.10.6210.0.10.63
4210.0.10.64/2610.0.10.65 – 10.0.10.12610.0.10.127
4310.0.10.128/2610.0.10.129 – 10.0.10.19010.0.10.191
4410.0.10.192/2610.0.10.193 – 10.0.10.25410.0.10.255
4510.0.11.0/2610.0.11.1 – 10.0.11.6210.0.11.63
4610.0.11.64/2610.0.11.65 – 10.0.11.12610.0.11.127
4710.0.11.128/2610.0.11.129 – 10.0.11.19010.0.11.191
4810.0.11.192/2610.0.11.193 – 10.0.11.25410.0.11.255
4910.0.12.0/2610.0.12.1 – 10.0.12.6210.0.12.63
5010.0.12.64/2610.0.12.65 – 10.0.12.12610.0.12.127
5110.0.12.128/2610.0.12.129 – 10.0.12.19010.0.12.191
5210.0.12.192/2610.0.12.193 – 10.0.12.25410.0.12.255
5310.0.13.0/2610.0.13.1 – 10.0.13.6210.0.13.63
5410.0.13.64/2610.0.13.65 – 10.0.13.12610.0.13.127
5510.0.13.128/2610.0.13.129 – 10.0.13.19010.0.13.191
5610.0.13.192/2610.0.13.193 – 10.0.13.25410.0.13.255
5710.0.14.0/2610.0.14.1 – 10.0.14.6210.0.14.63
5810.0.14.64/2610.0.14.65 – 10.0.14.12610.0.14.127
5910.0.14.128/2610.0.14.129 – 10.0.14.19010.0.14.191
6010.0.14.192/2610.0.14.193 – 10.0.14.25410.0.14.255
6110.0.15.0/2610.0.15.1 – 10.0.15.6210.0.15.63
6210.0.15.64/2610.0.15.65 – 10.0.15.12610.0.15.127
6310.0.15.128/2610.0.15.129 – 10.0.15.19010.0.15.191
6410.0.15.192/2610.0.15.193 – 10.0.15.25410.0.15.255
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 →