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)10.12.176.0/20
network10.12.176.0/20
broadcast10.12.191.255
first host10.12.176.1
last host10.12.191.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.12.176.0/20
address00001010.00001100.10110000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.00001100.10110000.00000000
broadcast00001010.00001100.10111111.11111111
green = network part, grey = host part
hex0x0a0cb000
decimal168603648
reverse dns0.176.12.10.in-addr.arpa
ipv4-mapped::ffff:a0c:b000

/20 split into /26 · 64 subnets

close ×
#networkhost rangebroadcast
110.12.176.0/2610.12.176.1 – 10.12.176.6210.12.176.63
210.12.176.64/2610.12.176.65 – 10.12.176.12610.12.176.127
310.12.176.128/2610.12.176.129 – 10.12.176.19010.12.176.191
410.12.176.192/2610.12.176.193 – 10.12.176.25410.12.176.255
510.12.177.0/2610.12.177.1 – 10.12.177.6210.12.177.63
610.12.177.64/2610.12.177.65 – 10.12.177.12610.12.177.127
710.12.177.128/2610.12.177.129 – 10.12.177.19010.12.177.191
810.12.177.192/2610.12.177.193 – 10.12.177.25410.12.177.255
910.12.178.0/2610.12.178.1 – 10.12.178.6210.12.178.63
1010.12.178.64/2610.12.178.65 – 10.12.178.12610.12.178.127
1110.12.178.128/2610.12.178.129 – 10.12.178.19010.12.178.191
1210.12.178.192/2610.12.178.193 – 10.12.178.25410.12.178.255
1310.12.179.0/2610.12.179.1 – 10.12.179.6210.12.179.63
1410.12.179.64/2610.12.179.65 – 10.12.179.12610.12.179.127
1510.12.179.128/2610.12.179.129 – 10.12.179.19010.12.179.191
1610.12.179.192/2610.12.179.193 – 10.12.179.25410.12.179.255
1710.12.180.0/2610.12.180.1 – 10.12.180.6210.12.180.63
1810.12.180.64/2610.12.180.65 – 10.12.180.12610.12.180.127
1910.12.180.128/2610.12.180.129 – 10.12.180.19010.12.180.191
2010.12.180.192/2610.12.180.193 – 10.12.180.25410.12.180.255
2110.12.181.0/2610.12.181.1 – 10.12.181.6210.12.181.63
2210.12.181.64/2610.12.181.65 – 10.12.181.12610.12.181.127
2310.12.181.128/2610.12.181.129 – 10.12.181.19010.12.181.191
2410.12.181.192/2610.12.181.193 – 10.12.181.25410.12.181.255
2510.12.182.0/2610.12.182.1 – 10.12.182.6210.12.182.63
2610.12.182.64/2610.12.182.65 – 10.12.182.12610.12.182.127
2710.12.182.128/2610.12.182.129 – 10.12.182.19010.12.182.191
2810.12.182.192/2610.12.182.193 – 10.12.182.25410.12.182.255
2910.12.183.0/2610.12.183.1 – 10.12.183.6210.12.183.63
3010.12.183.64/2610.12.183.65 – 10.12.183.12610.12.183.127
3110.12.183.128/2610.12.183.129 – 10.12.183.19010.12.183.191
3210.12.183.192/2610.12.183.193 – 10.12.183.25410.12.183.255
3310.12.184.0/2610.12.184.1 – 10.12.184.6210.12.184.63
3410.12.184.64/2610.12.184.65 – 10.12.184.12610.12.184.127
3510.12.184.128/2610.12.184.129 – 10.12.184.19010.12.184.191
3610.12.184.192/2610.12.184.193 – 10.12.184.25410.12.184.255
3710.12.185.0/2610.12.185.1 – 10.12.185.6210.12.185.63
3810.12.185.64/2610.12.185.65 – 10.12.185.12610.12.185.127
3910.12.185.128/2610.12.185.129 – 10.12.185.19010.12.185.191
4010.12.185.192/2610.12.185.193 – 10.12.185.25410.12.185.255
4110.12.186.0/2610.12.186.1 – 10.12.186.6210.12.186.63
4210.12.186.64/2610.12.186.65 – 10.12.186.12610.12.186.127
4310.12.186.128/2610.12.186.129 – 10.12.186.19010.12.186.191
4410.12.186.192/2610.12.186.193 – 10.12.186.25410.12.186.255
4510.12.187.0/2610.12.187.1 – 10.12.187.6210.12.187.63
4610.12.187.64/2610.12.187.65 – 10.12.187.12610.12.187.127
4710.12.187.128/2610.12.187.129 – 10.12.187.19010.12.187.191
4810.12.187.192/2610.12.187.193 – 10.12.187.25410.12.187.255
4910.12.188.0/2610.12.188.1 – 10.12.188.6210.12.188.63
5010.12.188.64/2610.12.188.65 – 10.12.188.12610.12.188.127
5110.12.188.128/2610.12.188.129 – 10.12.188.19010.12.188.191
5210.12.188.192/2610.12.188.193 – 10.12.188.25410.12.188.255
5310.12.189.0/2610.12.189.1 – 10.12.189.6210.12.189.63
5410.12.189.64/2610.12.189.65 – 10.12.189.12610.12.189.127
5510.12.189.128/2610.12.189.129 – 10.12.189.19010.12.189.191
5610.12.189.192/2610.12.189.193 – 10.12.189.25410.12.189.255
5710.12.190.0/2610.12.190.1 – 10.12.190.6210.12.190.63
5810.12.190.64/2610.12.190.65 – 10.12.190.12610.12.190.127
5910.12.190.128/2610.12.190.129 – 10.12.190.19010.12.190.191
6010.12.190.192/2610.12.190.193 – 10.12.190.25410.12.190.255
6110.12.191.0/2610.12.191.1 – 10.12.191.6210.12.191.63
6210.12.191.64/2610.12.191.65 – 10.12.191.12610.12.191.127
6310.12.191.128/2610.12.191.129 – 10.12.191.19010.12.191.191
6410.12.191.192/2610.12.191.193 – 10.12.191.25410.12.191.255
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 →