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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)10.6.176.0/20
network10.6.176.0/20
broadcast10.6.191.255
first host10.6.176.1
last host10.6.191.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.6.176.0/20
address00001010.00000110.10110000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.00000110.10110000.00000000
broadcast00001010.00000110.10111111.11111111
green = network part, grey = host part
hex0x0a06b000
decimal168210432
reverse dns0.176.6.10.in-addr.arpa
ipv4-mapped::ffff:a06:b000

/20 split into /26 · 64 subnets

close ×
#networkhost rangebroadcast
110.6.176.0/2610.6.176.1 – 10.6.176.6210.6.176.63
210.6.176.64/2610.6.176.65 – 10.6.176.12610.6.176.127
310.6.176.128/2610.6.176.129 – 10.6.176.19010.6.176.191
410.6.176.192/2610.6.176.193 – 10.6.176.25410.6.176.255
510.6.177.0/2610.6.177.1 – 10.6.177.6210.6.177.63
610.6.177.64/2610.6.177.65 – 10.6.177.12610.6.177.127
710.6.177.128/2610.6.177.129 – 10.6.177.19010.6.177.191
810.6.177.192/2610.6.177.193 – 10.6.177.25410.6.177.255
910.6.178.0/2610.6.178.1 – 10.6.178.6210.6.178.63
1010.6.178.64/2610.6.178.65 – 10.6.178.12610.6.178.127
1110.6.178.128/2610.6.178.129 – 10.6.178.19010.6.178.191
1210.6.178.192/2610.6.178.193 – 10.6.178.25410.6.178.255
1310.6.179.0/2610.6.179.1 – 10.6.179.6210.6.179.63
1410.6.179.64/2610.6.179.65 – 10.6.179.12610.6.179.127
1510.6.179.128/2610.6.179.129 – 10.6.179.19010.6.179.191
1610.6.179.192/2610.6.179.193 – 10.6.179.25410.6.179.255
1710.6.180.0/2610.6.180.1 – 10.6.180.6210.6.180.63
1810.6.180.64/2610.6.180.65 – 10.6.180.12610.6.180.127
1910.6.180.128/2610.6.180.129 – 10.6.180.19010.6.180.191
2010.6.180.192/2610.6.180.193 – 10.6.180.25410.6.180.255
2110.6.181.0/2610.6.181.1 – 10.6.181.6210.6.181.63
2210.6.181.64/2610.6.181.65 – 10.6.181.12610.6.181.127
2310.6.181.128/2610.6.181.129 – 10.6.181.19010.6.181.191
2410.6.181.192/2610.6.181.193 – 10.6.181.25410.6.181.255
2510.6.182.0/2610.6.182.1 – 10.6.182.6210.6.182.63
2610.6.182.64/2610.6.182.65 – 10.6.182.12610.6.182.127
2710.6.182.128/2610.6.182.129 – 10.6.182.19010.6.182.191
2810.6.182.192/2610.6.182.193 – 10.6.182.25410.6.182.255
2910.6.183.0/2610.6.183.1 – 10.6.183.6210.6.183.63
3010.6.183.64/2610.6.183.65 – 10.6.183.12610.6.183.127
3110.6.183.128/2610.6.183.129 – 10.6.183.19010.6.183.191
3210.6.183.192/2610.6.183.193 – 10.6.183.25410.6.183.255
3310.6.184.0/2610.6.184.1 – 10.6.184.6210.6.184.63
3410.6.184.64/2610.6.184.65 – 10.6.184.12610.6.184.127
3510.6.184.128/2610.6.184.129 – 10.6.184.19010.6.184.191
3610.6.184.192/2610.6.184.193 – 10.6.184.25410.6.184.255
3710.6.185.0/2610.6.185.1 – 10.6.185.6210.6.185.63
3810.6.185.64/2610.6.185.65 – 10.6.185.12610.6.185.127
3910.6.185.128/2610.6.185.129 – 10.6.185.19010.6.185.191
4010.6.185.192/2610.6.185.193 – 10.6.185.25410.6.185.255
4110.6.186.0/2610.6.186.1 – 10.6.186.6210.6.186.63
4210.6.186.64/2610.6.186.65 – 10.6.186.12610.6.186.127
4310.6.186.128/2610.6.186.129 – 10.6.186.19010.6.186.191
4410.6.186.192/2610.6.186.193 – 10.6.186.25410.6.186.255
4510.6.187.0/2610.6.187.1 – 10.6.187.6210.6.187.63
4610.6.187.64/2610.6.187.65 – 10.6.187.12610.6.187.127
4710.6.187.128/2610.6.187.129 – 10.6.187.19010.6.187.191
4810.6.187.192/2610.6.187.193 – 10.6.187.25410.6.187.255
4910.6.188.0/2610.6.188.1 – 10.6.188.6210.6.188.63
5010.6.188.64/2610.6.188.65 – 10.6.188.12610.6.188.127
5110.6.188.128/2610.6.188.129 – 10.6.188.19010.6.188.191
5210.6.188.192/2610.6.188.193 – 10.6.188.25410.6.188.255
5310.6.189.0/2610.6.189.1 – 10.6.189.6210.6.189.63
5410.6.189.64/2610.6.189.65 – 10.6.189.12610.6.189.127
5510.6.189.128/2610.6.189.129 – 10.6.189.19010.6.189.191
5610.6.189.192/2610.6.189.193 – 10.6.189.25410.6.189.255
5710.6.190.0/2610.6.190.1 – 10.6.190.6210.6.190.63
5810.6.190.64/2610.6.190.65 – 10.6.190.12610.6.190.127
5910.6.190.128/2610.6.190.129 – 10.6.190.19010.6.190.191
6010.6.190.192/2610.6.190.193 – 10.6.190.25410.6.190.255
6110.6.191.0/2610.6.191.1 – 10.6.191.6210.6.191.63
6210.6.191.64/2610.6.191.65 – 10.6.191.12610.6.191.127
6310.6.191.128/2610.6.191.129 – 10.6.191.19010.6.191.191
6410.6.191.192/2610.6.191.193 – 10.6.191.25410.6.191.255
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 →