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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)10.0.12.0/22
network10.0.12.0/22
broadcast10.0.15.255
first host10.0.12.1
last host10.0.15.254
subnet mask255.255.252.0
wildcard0.0.3.255
addresses1,024
usable hosts1,022
classA
ipcalc 10.0.12.0/22
address00001010.00000000.00001100.00000000
subnet mask11111111.11111111.11111100.00000000
network00001010.00000000.00001100.00000000
broadcast00001010.00000000.00001111.11111111
green = network part, grey = host part
hex0x0a000c00
decimal167775232
reverse dns0.12.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:c00

/22 split into /28 · 64 subnets

close ×
#networkhost rangebroadcast
110.0.12.0/2810.0.12.1 – 10.0.12.1410.0.12.15
210.0.12.16/2810.0.12.17 – 10.0.12.3010.0.12.31
310.0.12.32/2810.0.12.33 – 10.0.12.4610.0.12.47
410.0.12.48/2810.0.12.49 – 10.0.12.6210.0.12.63
510.0.12.64/2810.0.12.65 – 10.0.12.7810.0.12.79
610.0.12.80/2810.0.12.81 – 10.0.12.9410.0.12.95
710.0.12.96/2810.0.12.97 – 10.0.12.11010.0.12.111
810.0.12.112/2810.0.12.113 – 10.0.12.12610.0.12.127
910.0.12.128/2810.0.12.129 – 10.0.12.14210.0.12.143
1010.0.12.144/2810.0.12.145 – 10.0.12.15810.0.12.159
1110.0.12.160/2810.0.12.161 – 10.0.12.17410.0.12.175
1210.0.12.176/2810.0.12.177 – 10.0.12.19010.0.12.191
1310.0.12.192/2810.0.12.193 – 10.0.12.20610.0.12.207
1410.0.12.208/2810.0.12.209 – 10.0.12.22210.0.12.223
1510.0.12.224/2810.0.12.225 – 10.0.12.23810.0.12.239
1610.0.12.240/2810.0.12.241 – 10.0.12.25410.0.12.255
1710.0.13.0/2810.0.13.1 – 10.0.13.1410.0.13.15
1810.0.13.16/2810.0.13.17 – 10.0.13.3010.0.13.31
1910.0.13.32/2810.0.13.33 – 10.0.13.4610.0.13.47
2010.0.13.48/2810.0.13.49 – 10.0.13.6210.0.13.63
2110.0.13.64/2810.0.13.65 – 10.0.13.7810.0.13.79
2210.0.13.80/2810.0.13.81 – 10.0.13.9410.0.13.95
2310.0.13.96/2810.0.13.97 – 10.0.13.11010.0.13.111
2410.0.13.112/2810.0.13.113 – 10.0.13.12610.0.13.127
2510.0.13.128/2810.0.13.129 – 10.0.13.14210.0.13.143
2610.0.13.144/2810.0.13.145 – 10.0.13.15810.0.13.159
2710.0.13.160/2810.0.13.161 – 10.0.13.17410.0.13.175
2810.0.13.176/2810.0.13.177 – 10.0.13.19010.0.13.191
2910.0.13.192/2810.0.13.193 – 10.0.13.20610.0.13.207
3010.0.13.208/2810.0.13.209 – 10.0.13.22210.0.13.223
3110.0.13.224/2810.0.13.225 – 10.0.13.23810.0.13.239
3210.0.13.240/2810.0.13.241 – 10.0.13.25410.0.13.255
3310.0.14.0/2810.0.14.1 – 10.0.14.1410.0.14.15
3410.0.14.16/2810.0.14.17 – 10.0.14.3010.0.14.31
3510.0.14.32/2810.0.14.33 – 10.0.14.4610.0.14.47
3610.0.14.48/2810.0.14.49 – 10.0.14.6210.0.14.63
3710.0.14.64/2810.0.14.65 – 10.0.14.7810.0.14.79
3810.0.14.80/2810.0.14.81 – 10.0.14.9410.0.14.95
3910.0.14.96/2810.0.14.97 – 10.0.14.11010.0.14.111
4010.0.14.112/2810.0.14.113 – 10.0.14.12610.0.14.127
4110.0.14.128/2810.0.14.129 – 10.0.14.14210.0.14.143
4210.0.14.144/2810.0.14.145 – 10.0.14.15810.0.14.159
4310.0.14.160/2810.0.14.161 – 10.0.14.17410.0.14.175
4410.0.14.176/2810.0.14.177 – 10.0.14.19010.0.14.191
4510.0.14.192/2810.0.14.193 – 10.0.14.20610.0.14.207
4610.0.14.208/2810.0.14.209 – 10.0.14.22210.0.14.223
4710.0.14.224/2810.0.14.225 – 10.0.14.23810.0.14.239
4810.0.14.240/2810.0.14.241 – 10.0.14.25410.0.14.255
4910.0.15.0/2810.0.15.1 – 10.0.15.1410.0.15.15
5010.0.15.16/2810.0.15.17 – 10.0.15.3010.0.15.31
5110.0.15.32/2810.0.15.33 – 10.0.15.4610.0.15.47
5210.0.15.48/2810.0.15.49 – 10.0.15.6210.0.15.63
5310.0.15.64/2810.0.15.65 – 10.0.15.7810.0.15.79
5410.0.15.80/2810.0.15.81 – 10.0.15.9410.0.15.95
5510.0.15.96/2810.0.15.97 – 10.0.15.11010.0.15.111
5610.0.15.112/2810.0.15.113 – 10.0.15.12610.0.15.127
5710.0.15.128/2810.0.15.129 – 10.0.15.14210.0.15.143
5810.0.15.144/2810.0.15.145 – 10.0.15.15810.0.15.159
5910.0.15.160/2810.0.15.161 – 10.0.15.17410.0.15.175
6010.0.15.176/2810.0.15.177 – 10.0.15.19010.0.15.191
6110.0.15.192/2810.0.15.193 – 10.0.15.20610.0.15.207
6210.0.15.208/2810.0.15.209 – 10.0.15.22210.0.15.223
6310.0.15.224/2810.0.15.225 – 10.0.15.23810.0.15.239
6410.0.15.240/2810.0.15.241 – 10.0.15.25410.0.15.255
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 →