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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)10.2.56.0/22
network10.2.56.0/22
broadcast10.2.59.255
first host10.2.56.1
last host10.2.59.254
subnet mask255.255.252.0
wildcard0.0.3.255
addresses1,024
usable hosts1,022
classA
ipcalc 10.2.56.0/22
address00001010.00000010.00111000.00000000
subnet mask11111111.11111111.11111100.00000000
network00001010.00000010.00111000.00000000
broadcast00001010.00000010.00111011.11111111
green = network part, grey = host part
hex0x0a023800
decimal167917568
reverse dns0.56.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:3800

/22 split into /28 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.56.0/2810.2.56.1 – 10.2.56.1410.2.56.15
210.2.56.16/2810.2.56.17 – 10.2.56.3010.2.56.31
310.2.56.32/2810.2.56.33 – 10.2.56.4610.2.56.47
410.2.56.48/2810.2.56.49 – 10.2.56.6210.2.56.63
510.2.56.64/2810.2.56.65 – 10.2.56.7810.2.56.79
610.2.56.80/2810.2.56.81 – 10.2.56.9410.2.56.95
710.2.56.96/2810.2.56.97 – 10.2.56.11010.2.56.111
810.2.56.112/2810.2.56.113 – 10.2.56.12610.2.56.127
910.2.56.128/2810.2.56.129 – 10.2.56.14210.2.56.143
1010.2.56.144/2810.2.56.145 – 10.2.56.15810.2.56.159
1110.2.56.160/2810.2.56.161 – 10.2.56.17410.2.56.175
1210.2.56.176/2810.2.56.177 – 10.2.56.19010.2.56.191
1310.2.56.192/2810.2.56.193 – 10.2.56.20610.2.56.207
1410.2.56.208/2810.2.56.209 – 10.2.56.22210.2.56.223
1510.2.56.224/2810.2.56.225 – 10.2.56.23810.2.56.239
1610.2.56.240/2810.2.56.241 – 10.2.56.25410.2.56.255
1710.2.57.0/2810.2.57.1 – 10.2.57.1410.2.57.15
1810.2.57.16/2810.2.57.17 – 10.2.57.3010.2.57.31
1910.2.57.32/2810.2.57.33 – 10.2.57.4610.2.57.47
2010.2.57.48/2810.2.57.49 – 10.2.57.6210.2.57.63
2110.2.57.64/2810.2.57.65 – 10.2.57.7810.2.57.79
2210.2.57.80/2810.2.57.81 – 10.2.57.9410.2.57.95
2310.2.57.96/2810.2.57.97 – 10.2.57.11010.2.57.111
2410.2.57.112/2810.2.57.113 – 10.2.57.12610.2.57.127
2510.2.57.128/2810.2.57.129 – 10.2.57.14210.2.57.143
2610.2.57.144/2810.2.57.145 – 10.2.57.15810.2.57.159
2710.2.57.160/2810.2.57.161 – 10.2.57.17410.2.57.175
2810.2.57.176/2810.2.57.177 – 10.2.57.19010.2.57.191
2910.2.57.192/2810.2.57.193 – 10.2.57.20610.2.57.207
3010.2.57.208/2810.2.57.209 – 10.2.57.22210.2.57.223
3110.2.57.224/2810.2.57.225 – 10.2.57.23810.2.57.239
3210.2.57.240/2810.2.57.241 – 10.2.57.25410.2.57.255
3310.2.58.0/2810.2.58.1 – 10.2.58.1410.2.58.15
3410.2.58.16/2810.2.58.17 – 10.2.58.3010.2.58.31
3510.2.58.32/2810.2.58.33 – 10.2.58.4610.2.58.47
3610.2.58.48/2810.2.58.49 – 10.2.58.6210.2.58.63
3710.2.58.64/2810.2.58.65 – 10.2.58.7810.2.58.79
3810.2.58.80/2810.2.58.81 – 10.2.58.9410.2.58.95
3910.2.58.96/2810.2.58.97 – 10.2.58.11010.2.58.111
4010.2.58.112/2810.2.58.113 – 10.2.58.12610.2.58.127
4110.2.58.128/2810.2.58.129 – 10.2.58.14210.2.58.143
4210.2.58.144/2810.2.58.145 – 10.2.58.15810.2.58.159
4310.2.58.160/2810.2.58.161 – 10.2.58.17410.2.58.175
4410.2.58.176/2810.2.58.177 – 10.2.58.19010.2.58.191
4510.2.58.192/2810.2.58.193 – 10.2.58.20610.2.58.207
4610.2.58.208/2810.2.58.209 – 10.2.58.22210.2.58.223
4710.2.58.224/2810.2.58.225 – 10.2.58.23810.2.58.239
4810.2.58.240/2810.2.58.241 – 10.2.58.25410.2.58.255
4910.2.59.0/2810.2.59.1 – 10.2.59.1410.2.59.15
5010.2.59.16/2810.2.59.17 – 10.2.59.3010.2.59.31
5110.2.59.32/2810.2.59.33 – 10.2.59.4610.2.59.47
5210.2.59.48/2810.2.59.49 – 10.2.59.6210.2.59.63
5310.2.59.64/2810.2.59.65 – 10.2.59.7810.2.59.79
5410.2.59.80/2810.2.59.81 – 10.2.59.9410.2.59.95
5510.2.59.96/2810.2.59.97 – 10.2.59.11010.2.59.111
5610.2.59.112/2810.2.59.113 – 10.2.59.12610.2.59.127
5710.2.59.128/2810.2.59.129 – 10.2.59.14210.2.59.143
5810.2.59.144/2810.2.59.145 – 10.2.59.15810.2.59.159
5910.2.59.160/2810.2.59.161 – 10.2.59.17410.2.59.175
6010.2.59.176/2810.2.59.177 – 10.2.59.19010.2.59.191
6110.2.59.192/2810.2.59.193 – 10.2.59.20610.2.59.207
6210.2.59.208/2810.2.59.209 – 10.2.59.22210.2.59.223
6310.2.59.224/2810.2.59.225 – 10.2.59.23810.2.59.239
6410.2.59.240/2810.2.59.241 – 10.2.59.25410.2.59.255
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 →