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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)10.201.20.0/22
network10.201.20.0/22
broadcast10.201.23.255
first host10.201.20.1
last host10.201.23.254
subnet mask255.255.252.0
wildcard0.0.3.255
addresses1,024
usable hosts1,022
classA
ipcalc 10.201.20.0/22
address00001010.11001001.00010100.00000000
subnet mask11111111.11111111.11111100.00000000
network00001010.11001001.00010100.00000000
broadcast00001010.11001001.00010111.11111111
green = network part, grey = host part
hex0x0ac91400
decimal180950016
reverse dns0.20.201.10.in-addr.arpa
ipv4-mapped::ffff:ac9:1400

/22 split into /28 · 64 subnets

close ×
#networkhost rangebroadcast
110.201.20.0/2810.201.20.1 – 10.201.20.1410.201.20.15
210.201.20.16/2810.201.20.17 – 10.201.20.3010.201.20.31
310.201.20.32/2810.201.20.33 – 10.201.20.4610.201.20.47
410.201.20.48/2810.201.20.49 – 10.201.20.6210.201.20.63
510.201.20.64/2810.201.20.65 – 10.201.20.7810.201.20.79
610.201.20.80/2810.201.20.81 – 10.201.20.9410.201.20.95
710.201.20.96/2810.201.20.97 – 10.201.20.11010.201.20.111
810.201.20.112/2810.201.20.113 – 10.201.20.12610.201.20.127
910.201.20.128/2810.201.20.129 – 10.201.20.14210.201.20.143
1010.201.20.144/2810.201.20.145 – 10.201.20.15810.201.20.159
1110.201.20.160/2810.201.20.161 – 10.201.20.17410.201.20.175
1210.201.20.176/2810.201.20.177 – 10.201.20.19010.201.20.191
1310.201.20.192/2810.201.20.193 – 10.201.20.20610.201.20.207
1410.201.20.208/2810.201.20.209 – 10.201.20.22210.201.20.223
1510.201.20.224/2810.201.20.225 – 10.201.20.23810.201.20.239
1610.201.20.240/2810.201.20.241 – 10.201.20.25410.201.20.255
1710.201.21.0/2810.201.21.1 – 10.201.21.1410.201.21.15
1810.201.21.16/2810.201.21.17 – 10.201.21.3010.201.21.31
1910.201.21.32/2810.201.21.33 – 10.201.21.4610.201.21.47
2010.201.21.48/2810.201.21.49 – 10.201.21.6210.201.21.63
2110.201.21.64/2810.201.21.65 – 10.201.21.7810.201.21.79
2210.201.21.80/2810.201.21.81 – 10.201.21.9410.201.21.95
2310.201.21.96/2810.201.21.97 – 10.201.21.11010.201.21.111
2410.201.21.112/2810.201.21.113 – 10.201.21.12610.201.21.127
2510.201.21.128/2810.201.21.129 – 10.201.21.14210.201.21.143
2610.201.21.144/2810.201.21.145 – 10.201.21.15810.201.21.159
2710.201.21.160/2810.201.21.161 – 10.201.21.17410.201.21.175
2810.201.21.176/2810.201.21.177 – 10.201.21.19010.201.21.191
2910.201.21.192/2810.201.21.193 – 10.201.21.20610.201.21.207
3010.201.21.208/2810.201.21.209 – 10.201.21.22210.201.21.223
3110.201.21.224/2810.201.21.225 – 10.201.21.23810.201.21.239
3210.201.21.240/2810.201.21.241 – 10.201.21.25410.201.21.255
3310.201.22.0/2810.201.22.1 – 10.201.22.1410.201.22.15
3410.201.22.16/2810.201.22.17 – 10.201.22.3010.201.22.31
3510.201.22.32/2810.201.22.33 – 10.201.22.4610.201.22.47
3610.201.22.48/2810.201.22.49 – 10.201.22.6210.201.22.63
3710.201.22.64/2810.201.22.65 – 10.201.22.7810.201.22.79
3810.201.22.80/2810.201.22.81 – 10.201.22.9410.201.22.95
3910.201.22.96/2810.201.22.97 – 10.201.22.11010.201.22.111
4010.201.22.112/2810.201.22.113 – 10.201.22.12610.201.22.127
4110.201.22.128/2810.201.22.129 – 10.201.22.14210.201.22.143
4210.201.22.144/2810.201.22.145 – 10.201.22.15810.201.22.159
4310.201.22.160/2810.201.22.161 – 10.201.22.17410.201.22.175
4410.201.22.176/2810.201.22.177 – 10.201.22.19010.201.22.191
4510.201.22.192/2810.201.22.193 – 10.201.22.20610.201.22.207
4610.201.22.208/2810.201.22.209 – 10.201.22.22210.201.22.223
4710.201.22.224/2810.201.22.225 – 10.201.22.23810.201.22.239
4810.201.22.240/2810.201.22.241 – 10.201.22.25410.201.22.255
4910.201.23.0/2810.201.23.1 – 10.201.23.1410.201.23.15
5010.201.23.16/2810.201.23.17 – 10.201.23.3010.201.23.31
5110.201.23.32/2810.201.23.33 – 10.201.23.4610.201.23.47
5210.201.23.48/2810.201.23.49 – 10.201.23.6210.201.23.63
5310.201.23.64/2810.201.23.65 – 10.201.23.7810.201.23.79
5410.201.23.80/2810.201.23.81 – 10.201.23.9410.201.23.95
5510.201.23.96/2810.201.23.97 – 10.201.23.11010.201.23.111
5610.201.23.112/2810.201.23.113 – 10.201.23.12610.201.23.127
5710.201.23.128/2810.201.23.129 – 10.201.23.14210.201.23.143
5810.201.23.144/2810.201.23.145 – 10.201.23.15810.201.23.159
5910.201.23.160/2810.201.23.161 – 10.201.23.17410.201.23.175
6010.201.23.176/2810.201.23.177 – 10.201.23.19010.201.23.191
6110.201.23.192/2810.201.23.193 – 10.201.23.20610.201.23.207
6210.201.23.208/2810.201.23.209 – 10.201.23.22210.201.23.223
6310.201.23.224/2810.201.23.225 – 10.201.23.23810.201.23.239
6410.201.23.240/2810.201.23.241 – 10.201.23.25410.201.23.255
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 →