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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)10.72.40.0/22
network10.72.40.0/22
broadcast10.72.43.255
first host10.72.40.1
last host10.72.43.254
subnet mask255.255.252.0
wildcard0.0.3.255
addresses1,024
usable hosts1,022
classA
ipcalc 10.72.40.0/22
address00001010.01001000.00101000.00000000
subnet mask11111111.11111111.11111100.00000000
network00001010.01001000.00101000.00000000
broadcast00001010.01001000.00101011.11111111
green = network part, grey = host part
hex0x0a482800
decimal172500992
reverse dns0.40.72.10.in-addr.arpa
ipv4-mapped::ffff:a48:2800

/22 split into /28 · 64 subnets

close ×
#networkhost rangebroadcast
110.72.40.0/2810.72.40.1 – 10.72.40.1410.72.40.15
210.72.40.16/2810.72.40.17 – 10.72.40.3010.72.40.31
310.72.40.32/2810.72.40.33 – 10.72.40.4610.72.40.47
410.72.40.48/2810.72.40.49 – 10.72.40.6210.72.40.63
510.72.40.64/2810.72.40.65 – 10.72.40.7810.72.40.79
610.72.40.80/2810.72.40.81 – 10.72.40.9410.72.40.95
710.72.40.96/2810.72.40.97 – 10.72.40.11010.72.40.111
810.72.40.112/2810.72.40.113 – 10.72.40.12610.72.40.127
910.72.40.128/2810.72.40.129 – 10.72.40.14210.72.40.143
1010.72.40.144/2810.72.40.145 – 10.72.40.15810.72.40.159
1110.72.40.160/2810.72.40.161 – 10.72.40.17410.72.40.175
1210.72.40.176/2810.72.40.177 – 10.72.40.19010.72.40.191
1310.72.40.192/2810.72.40.193 – 10.72.40.20610.72.40.207
1410.72.40.208/2810.72.40.209 – 10.72.40.22210.72.40.223
1510.72.40.224/2810.72.40.225 – 10.72.40.23810.72.40.239
1610.72.40.240/2810.72.40.241 – 10.72.40.25410.72.40.255
1710.72.41.0/2810.72.41.1 – 10.72.41.1410.72.41.15
1810.72.41.16/2810.72.41.17 – 10.72.41.3010.72.41.31
1910.72.41.32/2810.72.41.33 – 10.72.41.4610.72.41.47
2010.72.41.48/2810.72.41.49 – 10.72.41.6210.72.41.63
2110.72.41.64/2810.72.41.65 – 10.72.41.7810.72.41.79
2210.72.41.80/2810.72.41.81 – 10.72.41.9410.72.41.95
2310.72.41.96/2810.72.41.97 – 10.72.41.11010.72.41.111
2410.72.41.112/2810.72.41.113 – 10.72.41.12610.72.41.127
2510.72.41.128/2810.72.41.129 – 10.72.41.14210.72.41.143
2610.72.41.144/2810.72.41.145 – 10.72.41.15810.72.41.159
2710.72.41.160/2810.72.41.161 – 10.72.41.17410.72.41.175
2810.72.41.176/2810.72.41.177 – 10.72.41.19010.72.41.191
2910.72.41.192/2810.72.41.193 – 10.72.41.20610.72.41.207
3010.72.41.208/2810.72.41.209 – 10.72.41.22210.72.41.223
3110.72.41.224/2810.72.41.225 – 10.72.41.23810.72.41.239
3210.72.41.240/2810.72.41.241 – 10.72.41.25410.72.41.255
3310.72.42.0/2810.72.42.1 – 10.72.42.1410.72.42.15
3410.72.42.16/2810.72.42.17 – 10.72.42.3010.72.42.31
3510.72.42.32/2810.72.42.33 – 10.72.42.4610.72.42.47
3610.72.42.48/2810.72.42.49 – 10.72.42.6210.72.42.63
3710.72.42.64/2810.72.42.65 – 10.72.42.7810.72.42.79
3810.72.42.80/2810.72.42.81 – 10.72.42.9410.72.42.95
3910.72.42.96/2810.72.42.97 – 10.72.42.11010.72.42.111
4010.72.42.112/2810.72.42.113 – 10.72.42.12610.72.42.127
4110.72.42.128/2810.72.42.129 – 10.72.42.14210.72.42.143
4210.72.42.144/2810.72.42.145 – 10.72.42.15810.72.42.159
4310.72.42.160/2810.72.42.161 – 10.72.42.17410.72.42.175
4410.72.42.176/2810.72.42.177 – 10.72.42.19010.72.42.191
4510.72.42.192/2810.72.42.193 – 10.72.42.20610.72.42.207
4610.72.42.208/2810.72.42.209 – 10.72.42.22210.72.42.223
4710.72.42.224/2810.72.42.225 – 10.72.42.23810.72.42.239
4810.72.42.240/2810.72.42.241 – 10.72.42.25410.72.42.255
4910.72.43.0/2810.72.43.1 – 10.72.43.1410.72.43.15
5010.72.43.16/2810.72.43.17 – 10.72.43.3010.72.43.31
5110.72.43.32/2810.72.43.33 – 10.72.43.4610.72.43.47
5210.72.43.48/2810.72.43.49 – 10.72.43.6210.72.43.63
5310.72.43.64/2810.72.43.65 – 10.72.43.7810.72.43.79
5410.72.43.80/2810.72.43.81 – 10.72.43.9410.72.43.95
5510.72.43.96/2810.72.43.97 – 10.72.43.11010.72.43.111
5610.72.43.112/2810.72.43.113 – 10.72.43.12610.72.43.127
5710.72.43.128/2810.72.43.129 – 10.72.43.14210.72.43.143
5810.72.43.144/2810.72.43.145 – 10.72.43.15810.72.43.159
5910.72.43.160/2810.72.43.161 – 10.72.43.17410.72.43.175
6010.72.43.176/2810.72.43.177 – 10.72.43.19010.72.43.191
6110.72.43.192/2810.72.43.193 – 10.72.43.20610.72.43.207
6210.72.43.208/2810.72.43.209 – 10.72.43.22210.72.43.223
6310.72.43.224/2810.72.43.225 – 10.72.43.23810.72.43.239
6410.72.43.240/2810.72.43.241 – 10.72.43.25410.72.43.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /22
/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-
/21255.255.248.02,0482,046-
/22255.255.252.01,0241,0221
/23255.255.254.05125102 split →
/24255.255.255.02562544 split →
/25255.255.255.1281281268 split →
/26255.255.255.192646216 split →
/27255.255.255.224323032 split →
/28255.255.255.240161464 split →
/29255.255.255.24886128 split →
/30255.255.255.25242256 split →
/31255.255.255.25422512 split →
/32255.255.255.255111,024 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 →