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
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 /27 · 128 subnets

close ×
#networkhost rangebroadcast
110.12.176.0/2710.12.176.1 – 10.12.176.3010.12.176.31
210.12.176.32/2710.12.176.33 – 10.12.176.6210.12.176.63
310.12.176.64/2710.12.176.65 – 10.12.176.9410.12.176.95
410.12.176.96/2710.12.176.97 – 10.12.176.12610.12.176.127
510.12.176.128/2710.12.176.129 – 10.12.176.15810.12.176.159
610.12.176.160/2710.12.176.161 – 10.12.176.19010.12.176.191
710.12.176.192/2710.12.176.193 – 10.12.176.22210.12.176.223
810.12.176.224/2710.12.176.225 – 10.12.176.25410.12.176.255
910.12.177.0/2710.12.177.1 – 10.12.177.3010.12.177.31
1010.12.177.32/2710.12.177.33 – 10.12.177.6210.12.177.63
1110.12.177.64/2710.12.177.65 – 10.12.177.9410.12.177.95
1210.12.177.96/2710.12.177.97 – 10.12.177.12610.12.177.127
1310.12.177.128/2710.12.177.129 – 10.12.177.15810.12.177.159
1410.12.177.160/2710.12.177.161 – 10.12.177.19010.12.177.191
1510.12.177.192/2710.12.177.193 – 10.12.177.22210.12.177.223
1610.12.177.224/2710.12.177.225 – 10.12.177.25410.12.177.255
1710.12.178.0/2710.12.178.1 – 10.12.178.3010.12.178.31
1810.12.178.32/2710.12.178.33 – 10.12.178.6210.12.178.63
1910.12.178.64/2710.12.178.65 – 10.12.178.9410.12.178.95
2010.12.178.96/2710.12.178.97 – 10.12.178.12610.12.178.127
2110.12.178.128/2710.12.178.129 – 10.12.178.15810.12.178.159
2210.12.178.160/2710.12.178.161 – 10.12.178.19010.12.178.191
2310.12.178.192/2710.12.178.193 – 10.12.178.22210.12.178.223
2410.12.178.224/2710.12.178.225 – 10.12.178.25410.12.178.255
2510.12.179.0/2710.12.179.1 – 10.12.179.3010.12.179.31
2610.12.179.32/2710.12.179.33 – 10.12.179.6210.12.179.63
2710.12.179.64/2710.12.179.65 – 10.12.179.9410.12.179.95
2810.12.179.96/2710.12.179.97 – 10.12.179.12610.12.179.127
2910.12.179.128/2710.12.179.129 – 10.12.179.15810.12.179.159
3010.12.179.160/2710.12.179.161 – 10.12.179.19010.12.179.191
3110.12.179.192/2710.12.179.193 – 10.12.179.22210.12.179.223
3210.12.179.224/2710.12.179.225 – 10.12.179.25410.12.179.255
3310.12.180.0/2710.12.180.1 – 10.12.180.3010.12.180.31
3410.12.180.32/2710.12.180.33 – 10.12.180.6210.12.180.63
3510.12.180.64/2710.12.180.65 – 10.12.180.9410.12.180.95
3610.12.180.96/2710.12.180.97 – 10.12.180.12610.12.180.127
3710.12.180.128/2710.12.180.129 – 10.12.180.15810.12.180.159
3810.12.180.160/2710.12.180.161 – 10.12.180.19010.12.180.191
3910.12.180.192/2710.12.180.193 – 10.12.180.22210.12.180.223
4010.12.180.224/2710.12.180.225 – 10.12.180.25410.12.180.255
4110.12.181.0/2710.12.181.1 – 10.12.181.3010.12.181.31
4210.12.181.32/2710.12.181.33 – 10.12.181.6210.12.181.63
4310.12.181.64/2710.12.181.65 – 10.12.181.9410.12.181.95
4410.12.181.96/2710.12.181.97 – 10.12.181.12610.12.181.127
4510.12.181.128/2710.12.181.129 – 10.12.181.15810.12.181.159
4610.12.181.160/2710.12.181.161 – 10.12.181.19010.12.181.191
4710.12.181.192/2710.12.181.193 – 10.12.181.22210.12.181.223
4810.12.181.224/2710.12.181.225 – 10.12.181.25410.12.181.255
4910.12.182.0/2710.12.182.1 – 10.12.182.3010.12.182.31
5010.12.182.32/2710.12.182.33 – 10.12.182.6210.12.182.63
5110.12.182.64/2710.12.182.65 – 10.12.182.9410.12.182.95
5210.12.182.96/2710.12.182.97 – 10.12.182.12610.12.182.127
5310.12.182.128/2710.12.182.129 – 10.12.182.15810.12.182.159
5410.12.182.160/2710.12.182.161 – 10.12.182.19010.12.182.191
5510.12.182.192/2710.12.182.193 – 10.12.182.22210.12.182.223
5610.12.182.224/2710.12.182.225 – 10.12.182.25410.12.182.255
5710.12.183.0/2710.12.183.1 – 10.12.183.3010.12.183.31
5810.12.183.32/2710.12.183.33 – 10.12.183.6210.12.183.63
5910.12.183.64/2710.12.183.65 – 10.12.183.9410.12.183.95
6010.12.183.96/2710.12.183.97 – 10.12.183.12610.12.183.127
6110.12.183.128/2710.12.183.129 – 10.12.183.15810.12.183.159
6210.12.183.160/2710.12.183.161 – 10.12.183.19010.12.183.191
6310.12.183.192/2710.12.183.193 – 10.12.183.22210.12.183.223
6410.12.183.224/2710.12.183.225 – 10.12.183.25410.12.183.255
6510.12.184.0/2710.12.184.1 – 10.12.184.3010.12.184.31
6610.12.184.32/2710.12.184.33 – 10.12.184.6210.12.184.63
6710.12.184.64/2710.12.184.65 – 10.12.184.9410.12.184.95
6810.12.184.96/2710.12.184.97 – 10.12.184.12610.12.184.127
6910.12.184.128/2710.12.184.129 – 10.12.184.15810.12.184.159
7010.12.184.160/2710.12.184.161 – 10.12.184.19010.12.184.191
7110.12.184.192/2710.12.184.193 – 10.12.184.22210.12.184.223
7210.12.184.224/2710.12.184.225 – 10.12.184.25410.12.184.255
7310.12.185.0/2710.12.185.1 – 10.12.185.3010.12.185.31
7410.12.185.32/2710.12.185.33 – 10.12.185.6210.12.185.63
7510.12.185.64/2710.12.185.65 – 10.12.185.9410.12.185.95
7610.12.185.96/2710.12.185.97 – 10.12.185.12610.12.185.127
7710.12.185.128/2710.12.185.129 – 10.12.185.15810.12.185.159
7810.12.185.160/2710.12.185.161 – 10.12.185.19010.12.185.191
7910.12.185.192/2710.12.185.193 – 10.12.185.22210.12.185.223
8010.12.185.224/2710.12.185.225 – 10.12.185.25410.12.185.255
8110.12.186.0/2710.12.186.1 – 10.12.186.3010.12.186.31
8210.12.186.32/2710.12.186.33 – 10.12.186.6210.12.186.63
8310.12.186.64/2710.12.186.65 – 10.12.186.9410.12.186.95
8410.12.186.96/2710.12.186.97 – 10.12.186.12610.12.186.127
8510.12.186.128/2710.12.186.129 – 10.12.186.15810.12.186.159
8610.12.186.160/2710.12.186.161 – 10.12.186.19010.12.186.191
8710.12.186.192/2710.12.186.193 – 10.12.186.22210.12.186.223
8810.12.186.224/2710.12.186.225 – 10.12.186.25410.12.186.255
8910.12.187.0/2710.12.187.1 – 10.12.187.3010.12.187.31
9010.12.187.32/2710.12.187.33 – 10.12.187.6210.12.187.63
9110.12.187.64/2710.12.187.65 – 10.12.187.9410.12.187.95
9210.12.187.96/2710.12.187.97 – 10.12.187.12610.12.187.127
9310.12.187.128/2710.12.187.129 – 10.12.187.15810.12.187.159
9410.12.187.160/2710.12.187.161 – 10.12.187.19010.12.187.191
9510.12.187.192/2710.12.187.193 – 10.12.187.22210.12.187.223
9610.12.187.224/2710.12.187.225 – 10.12.187.25410.12.187.255
9710.12.188.0/2710.12.188.1 – 10.12.188.3010.12.188.31
9810.12.188.32/2710.12.188.33 – 10.12.188.6210.12.188.63
9910.12.188.64/2710.12.188.65 – 10.12.188.9410.12.188.95
10010.12.188.96/2710.12.188.97 – 10.12.188.12610.12.188.127
10110.12.188.128/2710.12.188.129 – 10.12.188.15810.12.188.159
10210.12.188.160/2710.12.188.161 – 10.12.188.19010.12.188.191
10310.12.188.192/2710.12.188.193 – 10.12.188.22210.12.188.223
10410.12.188.224/2710.12.188.225 – 10.12.188.25410.12.188.255
10510.12.189.0/2710.12.189.1 – 10.12.189.3010.12.189.31
10610.12.189.32/2710.12.189.33 – 10.12.189.6210.12.189.63
10710.12.189.64/2710.12.189.65 – 10.12.189.9410.12.189.95
10810.12.189.96/2710.12.189.97 – 10.12.189.12610.12.189.127
10910.12.189.128/2710.12.189.129 – 10.12.189.15810.12.189.159
11010.12.189.160/2710.12.189.161 – 10.12.189.19010.12.189.191
11110.12.189.192/2710.12.189.193 – 10.12.189.22210.12.189.223
11210.12.189.224/2710.12.189.225 – 10.12.189.25410.12.189.255
11310.12.190.0/2710.12.190.1 – 10.12.190.3010.12.190.31
11410.12.190.32/2710.12.190.33 – 10.12.190.6210.12.190.63
11510.12.190.64/2710.12.190.65 – 10.12.190.9410.12.190.95
11610.12.190.96/2710.12.190.97 – 10.12.190.12610.12.190.127
11710.12.190.128/2710.12.190.129 – 10.12.190.15810.12.190.159
11810.12.190.160/2710.12.190.161 – 10.12.190.19010.12.190.191
11910.12.190.192/2710.12.190.193 – 10.12.190.22210.12.190.223
12010.12.190.224/2710.12.190.225 – 10.12.190.25410.12.190.255
12110.12.191.0/2710.12.191.1 – 10.12.191.3010.12.191.31
12210.12.191.32/2710.12.191.33 – 10.12.191.6210.12.191.63
12310.12.191.64/2710.12.191.65 – 10.12.191.9410.12.191.95
12410.12.191.96/2710.12.191.97 – 10.12.191.12610.12.191.127
12510.12.191.128/2710.12.191.129 – 10.12.191.15810.12.191.159
12610.12.191.160/2710.12.191.161 – 10.12.191.19010.12.191.191
12710.12.191.192/2710.12.191.193 – 10.12.191.22210.12.191.223
12810.12.191.224/2710.12.191.225 – 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 →