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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)10.1.120.0/22
network10.1.120.0/22
broadcast10.1.123.255
first host10.1.120.1
last host10.1.123.254
subnet mask255.255.252.0
wildcard0.0.3.255
addresses1,024
usable hosts1,022
classA
ipcalc 10.1.120.0/22
address00001010.00000001.01111000.00000000
subnet mask11111111.11111111.11111100.00000000
network00001010.00000001.01111000.00000000
broadcast00001010.00000001.01111011.11111111
green = network part, grey = host part
hex0x0a017800
decimal167868416
reverse dns0.120.1.10.in-addr.arpa
ipv4-mapped::ffff:a01:7800

/22 split into /28 · 64 subnets

close ×
#networkhost rangebroadcast
110.1.120.0/2810.1.120.1 – 10.1.120.1410.1.120.15
210.1.120.16/2810.1.120.17 – 10.1.120.3010.1.120.31
310.1.120.32/2810.1.120.33 – 10.1.120.4610.1.120.47
410.1.120.48/2810.1.120.49 – 10.1.120.6210.1.120.63
510.1.120.64/2810.1.120.65 – 10.1.120.7810.1.120.79
610.1.120.80/2810.1.120.81 – 10.1.120.9410.1.120.95
710.1.120.96/2810.1.120.97 – 10.1.120.11010.1.120.111
810.1.120.112/2810.1.120.113 – 10.1.120.12610.1.120.127
910.1.120.128/2810.1.120.129 – 10.1.120.14210.1.120.143
1010.1.120.144/2810.1.120.145 – 10.1.120.15810.1.120.159
1110.1.120.160/2810.1.120.161 – 10.1.120.17410.1.120.175
1210.1.120.176/2810.1.120.177 – 10.1.120.19010.1.120.191
1310.1.120.192/2810.1.120.193 – 10.1.120.20610.1.120.207
1410.1.120.208/2810.1.120.209 – 10.1.120.22210.1.120.223
1510.1.120.224/2810.1.120.225 – 10.1.120.23810.1.120.239
1610.1.120.240/2810.1.120.241 – 10.1.120.25410.1.120.255
1710.1.121.0/2810.1.121.1 – 10.1.121.1410.1.121.15
1810.1.121.16/2810.1.121.17 – 10.1.121.3010.1.121.31
1910.1.121.32/2810.1.121.33 – 10.1.121.4610.1.121.47
2010.1.121.48/2810.1.121.49 – 10.1.121.6210.1.121.63
2110.1.121.64/2810.1.121.65 – 10.1.121.7810.1.121.79
2210.1.121.80/2810.1.121.81 – 10.1.121.9410.1.121.95
2310.1.121.96/2810.1.121.97 – 10.1.121.11010.1.121.111
2410.1.121.112/2810.1.121.113 – 10.1.121.12610.1.121.127
2510.1.121.128/2810.1.121.129 – 10.1.121.14210.1.121.143
2610.1.121.144/2810.1.121.145 – 10.1.121.15810.1.121.159
2710.1.121.160/2810.1.121.161 – 10.1.121.17410.1.121.175
2810.1.121.176/2810.1.121.177 – 10.1.121.19010.1.121.191
2910.1.121.192/2810.1.121.193 – 10.1.121.20610.1.121.207
3010.1.121.208/2810.1.121.209 – 10.1.121.22210.1.121.223
3110.1.121.224/2810.1.121.225 – 10.1.121.23810.1.121.239
3210.1.121.240/2810.1.121.241 – 10.1.121.25410.1.121.255
3310.1.122.0/2810.1.122.1 – 10.1.122.1410.1.122.15
3410.1.122.16/2810.1.122.17 – 10.1.122.3010.1.122.31
3510.1.122.32/2810.1.122.33 – 10.1.122.4610.1.122.47
3610.1.122.48/2810.1.122.49 – 10.1.122.6210.1.122.63
3710.1.122.64/2810.1.122.65 – 10.1.122.7810.1.122.79
3810.1.122.80/2810.1.122.81 – 10.1.122.9410.1.122.95
3910.1.122.96/2810.1.122.97 – 10.1.122.11010.1.122.111
4010.1.122.112/2810.1.122.113 – 10.1.122.12610.1.122.127
4110.1.122.128/2810.1.122.129 – 10.1.122.14210.1.122.143
4210.1.122.144/2810.1.122.145 – 10.1.122.15810.1.122.159
4310.1.122.160/2810.1.122.161 – 10.1.122.17410.1.122.175
4410.1.122.176/2810.1.122.177 – 10.1.122.19010.1.122.191
4510.1.122.192/2810.1.122.193 – 10.1.122.20610.1.122.207
4610.1.122.208/2810.1.122.209 – 10.1.122.22210.1.122.223
4710.1.122.224/2810.1.122.225 – 10.1.122.23810.1.122.239
4810.1.122.240/2810.1.122.241 – 10.1.122.25410.1.122.255
4910.1.123.0/2810.1.123.1 – 10.1.123.1410.1.123.15
5010.1.123.16/2810.1.123.17 – 10.1.123.3010.1.123.31
5110.1.123.32/2810.1.123.33 – 10.1.123.4610.1.123.47
5210.1.123.48/2810.1.123.49 – 10.1.123.6210.1.123.63
5310.1.123.64/2810.1.123.65 – 10.1.123.7810.1.123.79
5410.1.123.80/2810.1.123.81 – 10.1.123.9410.1.123.95
5510.1.123.96/2810.1.123.97 – 10.1.123.11010.1.123.111
5610.1.123.112/2810.1.123.113 – 10.1.123.12610.1.123.127
5710.1.123.128/2810.1.123.129 – 10.1.123.14210.1.123.143
5810.1.123.144/2810.1.123.145 – 10.1.123.15810.1.123.159
5910.1.123.160/2810.1.123.161 – 10.1.123.17410.1.123.175
6010.1.123.176/2810.1.123.177 – 10.1.123.19010.1.123.191
6110.1.123.192/2810.1.123.193 – 10.1.123.20610.1.123.207
6210.1.123.208/2810.1.123.209 – 10.1.123.22210.1.123.223
6310.1.123.224/2810.1.123.225 – 10.1.123.23810.1.123.239
6410.1.123.240/2810.1.123.241 – 10.1.123.25410.1.123.255
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 →