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)10.167.184.0/21
network10.167.184.0/21
broadcast10.167.191.255
first host10.167.184.1
last host10.167.191.254
subnet mask255.255.248.0
wildcard0.0.7.255
addresses2,048
usable hosts2,046
classA
ipcalc 10.167.184.0/21
address00001010.10100111.10111000.00000000
subnet mask11111111.11111111.11111000.00000000
network00001010.10100111.10111000.00000000
broadcast00001010.10100111.10111111.11111111
green = network part, grey = host part
hex0x0aa7b800
decimal178763776
reverse dns0.184.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:b800

/21 split into /28 · 128 subnets

close ×
#networkhost rangebroadcast
110.167.184.0/2810.167.184.1 – 10.167.184.1410.167.184.15
210.167.184.16/2810.167.184.17 – 10.167.184.3010.167.184.31
310.167.184.32/2810.167.184.33 – 10.167.184.4610.167.184.47
410.167.184.48/2810.167.184.49 – 10.167.184.6210.167.184.63
510.167.184.64/2810.167.184.65 – 10.167.184.7810.167.184.79
610.167.184.80/2810.167.184.81 – 10.167.184.9410.167.184.95
710.167.184.96/2810.167.184.97 – 10.167.184.11010.167.184.111
810.167.184.112/2810.167.184.113 – 10.167.184.12610.167.184.127
910.167.184.128/2810.167.184.129 – 10.167.184.14210.167.184.143
1010.167.184.144/2810.167.184.145 – 10.167.184.15810.167.184.159
1110.167.184.160/2810.167.184.161 – 10.167.184.17410.167.184.175
1210.167.184.176/2810.167.184.177 – 10.167.184.19010.167.184.191
1310.167.184.192/2810.167.184.193 – 10.167.184.20610.167.184.207
1410.167.184.208/2810.167.184.209 – 10.167.184.22210.167.184.223
1510.167.184.224/2810.167.184.225 – 10.167.184.23810.167.184.239
1610.167.184.240/2810.167.184.241 – 10.167.184.25410.167.184.255
1710.167.185.0/2810.167.185.1 – 10.167.185.1410.167.185.15
1810.167.185.16/2810.167.185.17 – 10.167.185.3010.167.185.31
1910.167.185.32/2810.167.185.33 – 10.167.185.4610.167.185.47
2010.167.185.48/2810.167.185.49 – 10.167.185.6210.167.185.63
2110.167.185.64/2810.167.185.65 – 10.167.185.7810.167.185.79
2210.167.185.80/2810.167.185.81 – 10.167.185.9410.167.185.95
2310.167.185.96/2810.167.185.97 – 10.167.185.11010.167.185.111
2410.167.185.112/2810.167.185.113 – 10.167.185.12610.167.185.127
2510.167.185.128/2810.167.185.129 – 10.167.185.14210.167.185.143
2610.167.185.144/2810.167.185.145 – 10.167.185.15810.167.185.159
2710.167.185.160/2810.167.185.161 – 10.167.185.17410.167.185.175
2810.167.185.176/2810.167.185.177 – 10.167.185.19010.167.185.191
2910.167.185.192/2810.167.185.193 – 10.167.185.20610.167.185.207
3010.167.185.208/2810.167.185.209 – 10.167.185.22210.167.185.223
3110.167.185.224/2810.167.185.225 – 10.167.185.23810.167.185.239
3210.167.185.240/2810.167.185.241 – 10.167.185.25410.167.185.255
3310.167.186.0/2810.167.186.1 – 10.167.186.1410.167.186.15
3410.167.186.16/2810.167.186.17 – 10.167.186.3010.167.186.31
3510.167.186.32/2810.167.186.33 – 10.167.186.4610.167.186.47
3610.167.186.48/2810.167.186.49 – 10.167.186.6210.167.186.63
3710.167.186.64/2810.167.186.65 – 10.167.186.7810.167.186.79
3810.167.186.80/2810.167.186.81 – 10.167.186.9410.167.186.95
3910.167.186.96/2810.167.186.97 – 10.167.186.11010.167.186.111
4010.167.186.112/2810.167.186.113 – 10.167.186.12610.167.186.127
4110.167.186.128/2810.167.186.129 – 10.167.186.14210.167.186.143
4210.167.186.144/2810.167.186.145 – 10.167.186.15810.167.186.159
4310.167.186.160/2810.167.186.161 – 10.167.186.17410.167.186.175
4410.167.186.176/2810.167.186.177 – 10.167.186.19010.167.186.191
4510.167.186.192/2810.167.186.193 – 10.167.186.20610.167.186.207
4610.167.186.208/2810.167.186.209 – 10.167.186.22210.167.186.223
4710.167.186.224/2810.167.186.225 – 10.167.186.23810.167.186.239
4810.167.186.240/2810.167.186.241 – 10.167.186.25410.167.186.255
4910.167.187.0/2810.167.187.1 – 10.167.187.1410.167.187.15
5010.167.187.16/2810.167.187.17 – 10.167.187.3010.167.187.31
5110.167.187.32/2810.167.187.33 – 10.167.187.4610.167.187.47
5210.167.187.48/2810.167.187.49 – 10.167.187.6210.167.187.63
5310.167.187.64/2810.167.187.65 – 10.167.187.7810.167.187.79
5410.167.187.80/2810.167.187.81 – 10.167.187.9410.167.187.95
5510.167.187.96/2810.167.187.97 – 10.167.187.11010.167.187.111
5610.167.187.112/2810.167.187.113 – 10.167.187.12610.167.187.127
5710.167.187.128/2810.167.187.129 – 10.167.187.14210.167.187.143
5810.167.187.144/2810.167.187.145 – 10.167.187.15810.167.187.159
5910.167.187.160/2810.167.187.161 – 10.167.187.17410.167.187.175
6010.167.187.176/2810.167.187.177 – 10.167.187.19010.167.187.191
6110.167.187.192/2810.167.187.193 – 10.167.187.20610.167.187.207
6210.167.187.208/2810.167.187.209 – 10.167.187.22210.167.187.223
6310.167.187.224/2810.167.187.225 – 10.167.187.23810.167.187.239
6410.167.187.240/2810.167.187.241 – 10.167.187.25410.167.187.255
6510.167.188.0/2810.167.188.1 – 10.167.188.1410.167.188.15
6610.167.188.16/2810.167.188.17 – 10.167.188.3010.167.188.31
6710.167.188.32/2810.167.188.33 – 10.167.188.4610.167.188.47
6810.167.188.48/2810.167.188.49 – 10.167.188.6210.167.188.63
6910.167.188.64/2810.167.188.65 – 10.167.188.7810.167.188.79
7010.167.188.80/2810.167.188.81 – 10.167.188.9410.167.188.95
7110.167.188.96/2810.167.188.97 – 10.167.188.11010.167.188.111
7210.167.188.112/2810.167.188.113 – 10.167.188.12610.167.188.127
7310.167.188.128/2810.167.188.129 – 10.167.188.14210.167.188.143
7410.167.188.144/2810.167.188.145 – 10.167.188.15810.167.188.159
7510.167.188.160/2810.167.188.161 – 10.167.188.17410.167.188.175
7610.167.188.176/2810.167.188.177 – 10.167.188.19010.167.188.191
7710.167.188.192/2810.167.188.193 – 10.167.188.20610.167.188.207
7810.167.188.208/2810.167.188.209 – 10.167.188.22210.167.188.223
7910.167.188.224/2810.167.188.225 – 10.167.188.23810.167.188.239
8010.167.188.240/2810.167.188.241 – 10.167.188.25410.167.188.255
8110.167.189.0/2810.167.189.1 – 10.167.189.1410.167.189.15
8210.167.189.16/2810.167.189.17 – 10.167.189.3010.167.189.31
8310.167.189.32/2810.167.189.33 – 10.167.189.4610.167.189.47
8410.167.189.48/2810.167.189.49 – 10.167.189.6210.167.189.63
8510.167.189.64/2810.167.189.65 – 10.167.189.7810.167.189.79
8610.167.189.80/2810.167.189.81 – 10.167.189.9410.167.189.95
8710.167.189.96/2810.167.189.97 – 10.167.189.11010.167.189.111
8810.167.189.112/2810.167.189.113 – 10.167.189.12610.167.189.127
8910.167.189.128/2810.167.189.129 – 10.167.189.14210.167.189.143
9010.167.189.144/2810.167.189.145 – 10.167.189.15810.167.189.159
9110.167.189.160/2810.167.189.161 – 10.167.189.17410.167.189.175
9210.167.189.176/2810.167.189.177 – 10.167.189.19010.167.189.191
9310.167.189.192/2810.167.189.193 – 10.167.189.20610.167.189.207
9410.167.189.208/2810.167.189.209 – 10.167.189.22210.167.189.223
9510.167.189.224/2810.167.189.225 – 10.167.189.23810.167.189.239
9610.167.189.240/2810.167.189.241 – 10.167.189.25410.167.189.255
9710.167.190.0/2810.167.190.1 – 10.167.190.1410.167.190.15
9810.167.190.16/2810.167.190.17 – 10.167.190.3010.167.190.31
9910.167.190.32/2810.167.190.33 – 10.167.190.4610.167.190.47
10010.167.190.48/2810.167.190.49 – 10.167.190.6210.167.190.63
10110.167.190.64/2810.167.190.65 – 10.167.190.7810.167.190.79
10210.167.190.80/2810.167.190.81 – 10.167.190.9410.167.190.95
10310.167.190.96/2810.167.190.97 – 10.167.190.11010.167.190.111
10410.167.190.112/2810.167.190.113 – 10.167.190.12610.167.190.127
10510.167.190.128/2810.167.190.129 – 10.167.190.14210.167.190.143
10610.167.190.144/2810.167.190.145 – 10.167.190.15810.167.190.159
10710.167.190.160/2810.167.190.161 – 10.167.190.17410.167.190.175
10810.167.190.176/2810.167.190.177 – 10.167.190.19010.167.190.191
10910.167.190.192/2810.167.190.193 – 10.167.190.20610.167.190.207
11010.167.190.208/2810.167.190.209 – 10.167.190.22210.167.190.223
11110.167.190.224/2810.167.190.225 – 10.167.190.23810.167.190.239
11210.167.190.240/2810.167.190.241 – 10.167.190.25410.167.190.255
11310.167.191.0/2810.167.191.1 – 10.167.191.1410.167.191.15
11410.167.191.16/2810.167.191.17 – 10.167.191.3010.167.191.31
11510.167.191.32/2810.167.191.33 – 10.167.191.4610.167.191.47
11610.167.191.48/2810.167.191.49 – 10.167.191.6210.167.191.63
11710.167.191.64/2810.167.191.65 – 10.167.191.7810.167.191.79
11810.167.191.80/2810.167.191.81 – 10.167.191.9410.167.191.95
11910.167.191.96/2810.167.191.97 – 10.167.191.11010.167.191.111
12010.167.191.112/2810.167.191.113 – 10.167.191.12610.167.191.127
12110.167.191.128/2810.167.191.129 – 10.167.191.14210.167.191.143
12210.167.191.144/2810.167.191.145 – 10.167.191.15810.167.191.159
12310.167.191.160/2810.167.191.161 – 10.167.191.17410.167.191.175
12410.167.191.176/2810.167.191.177 – 10.167.191.19010.167.191.191
12510.167.191.192/2810.167.191.193 – 10.167.191.20610.167.191.207
12610.167.191.208/2810.167.191.209 – 10.167.191.22210.167.191.223
12710.167.191.224/2810.167.191.225 – 10.167.191.23810.167.191.239
12810.167.191.240/2810.167.191.241 – 10.167.191.25410.167.191.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /21
/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-
/20255.255.240.04,0964,094-
/21255.255.248.02,0482,0461
/22255.255.252.01,0241,0222 split →
/23255.255.254.05125104 split →
/24255.255.255.02562548 split →
/25255.255.255.12812812616 split →
/26255.255.255.192646232 split →
/27255.255.255.224323064 split →
/28255.255.255.2401614128 split →
/29255.255.255.24886256 split →
/30255.255.255.25242512 split →
/31255.255.255.254221,024 split →
/32255.255.255.255112,048 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 →