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)10.232.136.0/21
network10.232.136.0/21
broadcast10.232.143.255
first host10.232.136.1
last host10.232.143.254
subnet mask255.255.248.0
wildcard0.0.7.255
addresses2,048
usable hosts2,046
classA
ipcalc 10.232.136.0/21
address00001010.11101000.10001000.00000000
subnet mask11111111.11111111.11111000.00000000
network00001010.11101000.10001000.00000000
broadcast00001010.11101000.10001111.11111111
green = network part, grey = host part
hex0x0ae88800
decimal183011328
reverse dns0.136.232.10.in-addr.arpa
ipv4-mapped::ffff:ae8:8800

/21 split into /28 · 128 subnets

close ×
#networkhost rangebroadcast
110.232.136.0/2810.232.136.1 – 10.232.136.1410.232.136.15
210.232.136.16/2810.232.136.17 – 10.232.136.3010.232.136.31
310.232.136.32/2810.232.136.33 – 10.232.136.4610.232.136.47
410.232.136.48/2810.232.136.49 – 10.232.136.6210.232.136.63
510.232.136.64/2810.232.136.65 – 10.232.136.7810.232.136.79
610.232.136.80/2810.232.136.81 – 10.232.136.9410.232.136.95
710.232.136.96/2810.232.136.97 – 10.232.136.11010.232.136.111
810.232.136.112/2810.232.136.113 – 10.232.136.12610.232.136.127
910.232.136.128/2810.232.136.129 – 10.232.136.14210.232.136.143
1010.232.136.144/2810.232.136.145 – 10.232.136.15810.232.136.159
1110.232.136.160/2810.232.136.161 – 10.232.136.17410.232.136.175
1210.232.136.176/2810.232.136.177 – 10.232.136.19010.232.136.191
1310.232.136.192/2810.232.136.193 – 10.232.136.20610.232.136.207
1410.232.136.208/2810.232.136.209 – 10.232.136.22210.232.136.223
1510.232.136.224/2810.232.136.225 – 10.232.136.23810.232.136.239
1610.232.136.240/2810.232.136.241 – 10.232.136.25410.232.136.255
1710.232.137.0/2810.232.137.1 – 10.232.137.1410.232.137.15
1810.232.137.16/2810.232.137.17 – 10.232.137.3010.232.137.31
1910.232.137.32/2810.232.137.33 – 10.232.137.4610.232.137.47
2010.232.137.48/2810.232.137.49 – 10.232.137.6210.232.137.63
2110.232.137.64/2810.232.137.65 – 10.232.137.7810.232.137.79
2210.232.137.80/2810.232.137.81 – 10.232.137.9410.232.137.95
2310.232.137.96/2810.232.137.97 – 10.232.137.11010.232.137.111
2410.232.137.112/2810.232.137.113 – 10.232.137.12610.232.137.127
2510.232.137.128/2810.232.137.129 – 10.232.137.14210.232.137.143
2610.232.137.144/2810.232.137.145 – 10.232.137.15810.232.137.159
2710.232.137.160/2810.232.137.161 – 10.232.137.17410.232.137.175
2810.232.137.176/2810.232.137.177 – 10.232.137.19010.232.137.191
2910.232.137.192/2810.232.137.193 – 10.232.137.20610.232.137.207
3010.232.137.208/2810.232.137.209 – 10.232.137.22210.232.137.223
3110.232.137.224/2810.232.137.225 – 10.232.137.23810.232.137.239
3210.232.137.240/2810.232.137.241 – 10.232.137.25410.232.137.255
3310.232.138.0/2810.232.138.1 – 10.232.138.1410.232.138.15
3410.232.138.16/2810.232.138.17 – 10.232.138.3010.232.138.31
3510.232.138.32/2810.232.138.33 – 10.232.138.4610.232.138.47
3610.232.138.48/2810.232.138.49 – 10.232.138.6210.232.138.63
3710.232.138.64/2810.232.138.65 – 10.232.138.7810.232.138.79
3810.232.138.80/2810.232.138.81 – 10.232.138.9410.232.138.95
3910.232.138.96/2810.232.138.97 – 10.232.138.11010.232.138.111
4010.232.138.112/2810.232.138.113 – 10.232.138.12610.232.138.127
4110.232.138.128/2810.232.138.129 – 10.232.138.14210.232.138.143
4210.232.138.144/2810.232.138.145 – 10.232.138.15810.232.138.159
4310.232.138.160/2810.232.138.161 – 10.232.138.17410.232.138.175
4410.232.138.176/2810.232.138.177 – 10.232.138.19010.232.138.191
4510.232.138.192/2810.232.138.193 – 10.232.138.20610.232.138.207
4610.232.138.208/2810.232.138.209 – 10.232.138.22210.232.138.223
4710.232.138.224/2810.232.138.225 – 10.232.138.23810.232.138.239
4810.232.138.240/2810.232.138.241 – 10.232.138.25410.232.138.255
4910.232.139.0/2810.232.139.1 – 10.232.139.1410.232.139.15
5010.232.139.16/2810.232.139.17 – 10.232.139.3010.232.139.31
5110.232.139.32/2810.232.139.33 – 10.232.139.4610.232.139.47
5210.232.139.48/2810.232.139.49 – 10.232.139.6210.232.139.63
5310.232.139.64/2810.232.139.65 – 10.232.139.7810.232.139.79
5410.232.139.80/2810.232.139.81 – 10.232.139.9410.232.139.95
5510.232.139.96/2810.232.139.97 – 10.232.139.11010.232.139.111
5610.232.139.112/2810.232.139.113 – 10.232.139.12610.232.139.127
5710.232.139.128/2810.232.139.129 – 10.232.139.14210.232.139.143
5810.232.139.144/2810.232.139.145 – 10.232.139.15810.232.139.159
5910.232.139.160/2810.232.139.161 – 10.232.139.17410.232.139.175
6010.232.139.176/2810.232.139.177 – 10.232.139.19010.232.139.191
6110.232.139.192/2810.232.139.193 – 10.232.139.20610.232.139.207
6210.232.139.208/2810.232.139.209 – 10.232.139.22210.232.139.223
6310.232.139.224/2810.232.139.225 – 10.232.139.23810.232.139.239
6410.232.139.240/2810.232.139.241 – 10.232.139.25410.232.139.255
6510.232.140.0/2810.232.140.1 – 10.232.140.1410.232.140.15
6610.232.140.16/2810.232.140.17 – 10.232.140.3010.232.140.31
6710.232.140.32/2810.232.140.33 – 10.232.140.4610.232.140.47
6810.232.140.48/2810.232.140.49 – 10.232.140.6210.232.140.63
6910.232.140.64/2810.232.140.65 – 10.232.140.7810.232.140.79
7010.232.140.80/2810.232.140.81 – 10.232.140.9410.232.140.95
7110.232.140.96/2810.232.140.97 – 10.232.140.11010.232.140.111
7210.232.140.112/2810.232.140.113 – 10.232.140.12610.232.140.127
7310.232.140.128/2810.232.140.129 – 10.232.140.14210.232.140.143
7410.232.140.144/2810.232.140.145 – 10.232.140.15810.232.140.159
7510.232.140.160/2810.232.140.161 – 10.232.140.17410.232.140.175
7610.232.140.176/2810.232.140.177 – 10.232.140.19010.232.140.191
7710.232.140.192/2810.232.140.193 – 10.232.140.20610.232.140.207
7810.232.140.208/2810.232.140.209 – 10.232.140.22210.232.140.223
7910.232.140.224/2810.232.140.225 – 10.232.140.23810.232.140.239
8010.232.140.240/2810.232.140.241 – 10.232.140.25410.232.140.255
8110.232.141.0/2810.232.141.1 – 10.232.141.1410.232.141.15
8210.232.141.16/2810.232.141.17 – 10.232.141.3010.232.141.31
8310.232.141.32/2810.232.141.33 – 10.232.141.4610.232.141.47
8410.232.141.48/2810.232.141.49 – 10.232.141.6210.232.141.63
8510.232.141.64/2810.232.141.65 – 10.232.141.7810.232.141.79
8610.232.141.80/2810.232.141.81 – 10.232.141.9410.232.141.95
8710.232.141.96/2810.232.141.97 – 10.232.141.11010.232.141.111
8810.232.141.112/2810.232.141.113 – 10.232.141.12610.232.141.127
8910.232.141.128/2810.232.141.129 – 10.232.141.14210.232.141.143
9010.232.141.144/2810.232.141.145 – 10.232.141.15810.232.141.159
9110.232.141.160/2810.232.141.161 – 10.232.141.17410.232.141.175
9210.232.141.176/2810.232.141.177 – 10.232.141.19010.232.141.191
9310.232.141.192/2810.232.141.193 – 10.232.141.20610.232.141.207
9410.232.141.208/2810.232.141.209 – 10.232.141.22210.232.141.223
9510.232.141.224/2810.232.141.225 – 10.232.141.23810.232.141.239
9610.232.141.240/2810.232.141.241 – 10.232.141.25410.232.141.255
9710.232.142.0/2810.232.142.1 – 10.232.142.1410.232.142.15
9810.232.142.16/2810.232.142.17 – 10.232.142.3010.232.142.31
9910.232.142.32/2810.232.142.33 – 10.232.142.4610.232.142.47
10010.232.142.48/2810.232.142.49 – 10.232.142.6210.232.142.63
10110.232.142.64/2810.232.142.65 – 10.232.142.7810.232.142.79
10210.232.142.80/2810.232.142.81 – 10.232.142.9410.232.142.95
10310.232.142.96/2810.232.142.97 – 10.232.142.11010.232.142.111
10410.232.142.112/2810.232.142.113 – 10.232.142.12610.232.142.127
10510.232.142.128/2810.232.142.129 – 10.232.142.14210.232.142.143
10610.232.142.144/2810.232.142.145 – 10.232.142.15810.232.142.159
10710.232.142.160/2810.232.142.161 – 10.232.142.17410.232.142.175
10810.232.142.176/2810.232.142.177 – 10.232.142.19010.232.142.191
10910.232.142.192/2810.232.142.193 – 10.232.142.20610.232.142.207
11010.232.142.208/2810.232.142.209 – 10.232.142.22210.232.142.223
11110.232.142.224/2810.232.142.225 – 10.232.142.23810.232.142.239
11210.232.142.240/2810.232.142.241 – 10.232.142.25410.232.142.255
11310.232.143.0/2810.232.143.1 – 10.232.143.1410.232.143.15
11410.232.143.16/2810.232.143.17 – 10.232.143.3010.232.143.31
11510.232.143.32/2810.232.143.33 – 10.232.143.4610.232.143.47
11610.232.143.48/2810.232.143.49 – 10.232.143.6210.232.143.63
11710.232.143.64/2810.232.143.65 – 10.232.143.7810.232.143.79
11810.232.143.80/2810.232.143.81 – 10.232.143.9410.232.143.95
11910.232.143.96/2810.232.143.97 – 10.232.143.11010.232.143.111
12010.232.143.112/2810.232.143.113 – 10.232.143.12610.232.143.127
12110.232.143.128/2810.232.143.129 – 10.232.143.14210.232.143.143
12210.232.143.144/2810.232.143.145 – 10.232.143.15810.232.143.159
12310.232.143.160/2810.232.143.161 – 10.232.143.17410.232.143.175
12410.232.143.176/2810.232.143.177 – 10.232.143.19010.232.143.191
12510.232.143.192/2810.232.143.193 – 10.232.143.20610.232.143.207
12610.232.143.208/2810.232.143.209 – 10.232.143.22210.232.143.223
12710.232.143.224/2810.232.143.225 – 10.232.143.23810.232.143.239
12810.232.143.240/2810.232.143.241 – 10.232.143.25410.232.143.255
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 →