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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)10.243.72.0/22
network10.243.72.0/22
broadcast10.243.75.255
first host10.243.72.1
last host10.243.75.254
subnet mask255.255.252.0
wildcard0.0.3.255
addresses1,024
usable hosts1,022
classA
ipcalc 10.243.72.0/22
address00001010.11110011.01001000.00000000
subnet mask11111111.11111111.11111100.00000000
network00001010.11110011.01001000.00000000
broadcast00001010.11110011.01001011.11111111
green = network part, grey = host part
hex0x0af34800
decimal183715840
reverse dns0.72.243.10.in-addr.arpa
ipv4-mapped::ffff:af3:4800

/22 split into /28 · 64 subnets

close ×
#networkhost rangebroadcast
110.243.72.0/2810.243.72.1 – 10.243.72.1410.243.72.15
210.243.72.16/2810.243.72.17 – 10.243.72.3010.243.72.31
310.243.72.32/2810.243.72.33 – 10.243.72.4610.243.72.47
410.243.72.48/2810.243.72.49 – 10.243.72.6210.243.72.63
510.243.72.64/2810.243.72.65 – 10.243.72.7810.243.72.79
610.243.72.80/2810.243.72.81 – 10.243.72.9410.243.72.95
710.243.72.96/2810.243.72.97 – 10.243.72.11010.243.72.111
810.243.72.112/2810.243.72.113 – 10.243.72.12610.243.72.127
910.243.72.128/2810.243.72.129 – 10.243.72.14210.243.72.143
1010.243.72.144/2810.243.72.145 – 10.243.72.15810.243.72.159
1110.243.72.160/2810.243.72.161 – 10.243.72.17410.243.72.175
1210.243.72.176/2810.243.72.177 – 10.243.72.19010.243.72.191
1310.243.72.192/2810.243.72.193 – 10.243.72.20610.243.72.207
1410.243.72.208/2810.243.72.209 – 10.243.72.22210.243.72.223
1510.243.72.224/2810.243.72.225 – 10.243.72.23810.243.72.239
1610.243.72.240/2810.243.72.241 – 10.243.72.25410.243.72.255
1710.243.73.0/2810.243.73.1 – 10.243.73.1410.243.73.15
1810.243.73.16/2810.243.73.17 – 10.243.73.3010.243.73.31
1910.243.73.32/2810.243.73.33 – 10.243.73.4610.243.73.47
2010.243.73.48/2810.243.73.49 – 10.243.73.6210.243.73.63
2110.243.73.64/2810.243.73.65 – 10.243.73.7810.243.73.79
2210.243.73.80/2810.243.73.81 – 10.243.73.9410.243.73.95
2310.243.73.96/2810.243.73.97 – 10.243.73.11010.243.73.111
2410.243.73.112/2810.243.73.113 – 10.243.73.12610.243.73.127
2510.243.73.128/2810.243.73.129 – 10.243.73.14210.243.73.143
2610.243.73.144/2810.243.73.145 – 10.243.73.15810.243.73.159
2710.243.73.160/2810.243.73.161 – 10.243.73.17410.243.73.175
2810.243.73.176/2810.243.73.177 – 10.243.73.19010.243.73.191
2910.243.73.192/2810.243.73.193 – 10.243.73.20610.243.73.207
3010.243.73.208/2810.243.73.209 – 10.243.73.22210.243.73.223
3110.243.73.224/2810.243.73.225 – 10.243.73.23810.243.73.239
3210.243.73.240/2810.243.73.241 – 10.243.73.25410.243.73.255
3310.243.74.0/2810.243.74.1 – 10.243.74.1410.243.74.15
3410.243.74.16/2810.243.74.17 – 10.243.74.3010.243.74.31
3510.243.74.32/2810.243.74.33 – 10.243.74.4610.243.74.47
3610.243.74.48/2810.243.74.49 – 10.243.74.6210.243.74.63
3710.243.74.64/2810.243.74.65 – 10.243.74.7810.243.74.79
3810.243.74.80/2810.243.74.81 – 10.243.74.9410.243.74.95
3910.243.74.96/2810.243.74.97 – 10.243.74.11010.243.74.111
4010.243.74.112/2810.243.74.113 – 10.243.74.12610.243.74.127
4110.243.74.128/2810.243.74.129 – 10.243.74.14210.243.74.143
4210.243.74.144/2810.243.74.145 – 10.243.74.15810.243.74.159
4310.243.74.160/2810.243.74.161 – 10.243.74.17410.243.74.175
4410.243.74.176/2810.243.74.177 – 10.243.74.19010.243.74.191
4510.243.74.192/2810.243.74.193 – 10.243.74.20610.243.74.207
4610.243.74.208/2810.243.74.209 – 10.243.74.22210.243.74.223
4710.243.74.224/2810.243.74.225 – 10.243.74.23810.243.74.239
4810.243.74.240/2810.243.74.241 – 10.243.74.25410.243.74.255
4910.243.75.0/2810.243.75.1 – 10.243.75.1410.243.75.15
5010.243.75.16/2810.243.75.17 – 10.243.75.3010.243.75.31
5110.243.75.32/2810.243.75.33 – 10.243.75.4610.243.75.47
5210.243.75.48/2810.243.75.49 – 10.243.75.6210.243.75.63
5310.243.75.64/2810.243.75.65 – 10.243.75.7810.243.75.79
5410.243.75.80/2810.243.75.81 – 10.243.75.9410.243.75.95
5510.243.75.96/2810.243.75.97 – 10.243.75.11010.243.75.111
5610.243.75.112/2810.243.75.113 – 10.243.75.12610.243.75.127
5710.243.75.128/2810.243.75.129 – 10.243.75.14210.243.75.143
5810.243.75.144/2810.243.75.145 – 10.243.75.15810.243.75.159
5910.243.75.160/2810.243.75.161 – 10.243.75.17410.243.75.175
6010.243.75.176/2810.243.75.177 – 10.243.75.19010.243.75.191
6110.243.75.192/2810.243.75.193 – 10.243.75.20610.243.75.207
6210.243.75.208/2810.243.75.209 – 10.243.75.22210.243.75.223
6310.243.75.224/2810.243.75.225 – 10.243.75.23810.243.75.239
6410.243.75.240/2810.243.75.241 – 10.243.75.25410.243.75.255
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 →