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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)10.40.0.0/22
network10.40.0.0/22
broadcast10.40.3.255
first host10.40.0.1
last host10.40.3.254
subnet mask255.255.252.0
wildcard0.0.3.255
addresses1,024
usable hosts1,022
classA
ipcalc 10.40.0.0/22
address00001010.00101000.00000000.00000000
subnet mask11111111.11111111.11111100.00000000
network00001010.00101000.00000000.00000000
broadcast00001010.00101000.00000011.11111111
green = network part, grey = host part
hex0x0a280000
decimal170393600
reverse dns0.0.40.10.in-addr.arpa
ipv4-mapped::ffff:a28:0

/22 split into /28 · 64 subnets

close ×
#networkhost rangebroadcast
110.40.0.0/2810.40.0.1 – 10.40.0.1410.40.0.15
210.40.0.16/2810.40.0.17 – 10.40.0.3010.40.0.31
310.40.0.32/2810.40.0.33 – 10.40.0.4610.40.0.47
410.40.0.48/2810.40.0.49 – 10.40.0.6210.40.0.63
510.40.0.64/2810.40.0.65 – 10.40.0.7810.40.0.79
610.40.0.80/2810.40.0.81 – 10.40.0.9410.40.0.95
710.40.0.96/2810.40.0.97 – 10.40.0.11010.40.0.111
810.40.0.112/2810.40.0.113 – 10.40.0.12610.40.0.127
910.40.0.128/2810.40.0.129 – 10.40.0.14210.40.0.143
1010.40.0.144/2810.40.0.145 – 10.40.0.15810.40.0.159
1110.40.0.160/2810.40.0.161 – 10.40.0.17410.40.0.175
1210.40.0.176/2810.40.0.177 – 10.40.0.19010.40.0.191
1310.40.0.192/2810.40.0.193 – 10.40.0.20610.40.0.207
1410.40.0.208/2810.40.0.209 – 10.40.0.22210.40.0.223
1510.40.0.224/2810.40.0.225 – 10.40.0.23810.40.0.239
1610.40.0.240/2810.40.0.241 – 10.40.0.25410.40.0.255
1710.40.1.0/2810.40.1.1 – 10.40.1.1410.40.1.15
1810.40.1.16/2810.40.1.17 – 10.40.1.3010.40.1.31
1910.40.1.32/2810.40.1.33 – 10.40.1.4610.40.1.47
2010.40.1.48/2810.40.1.49 – 10.40.1.6210.40.1.63
2110.40.1.64/2810.40.1.65 – 10.40.1.7810.40.1.79
2210.40.1.80/2810.40.1.81 – 10.40.1.9410.40.1.95
2310.40.1.96/2810.40.1.97 – 10.40.1.11010.40.1.111
2410.40.1.112/2810.40.1.113 – 10.40.1.12610.40.1.127
2510.40.1.128/2810.40.1.129 – 10.40.1.14210.40.1.143
2610.40.1.144/2810.40.1.145 – 10.40.1.15810.40.1.159
2710.40.1.160/2810.40.1.161 – 10.40.1.17410.40.1.175
2810.40.1.176/2810.40.1.177 – 10.40.1.19010.40.1.191
2910.40.1.192/2810.40.1.193 – 10.40.1.20610.40.1.207
3010.40.1.208/2810.40.1.209 – 10.40.1.22210.40.1.223
3110.40.1.224/2810.40.1.225 – 10.40.1.23810.40.1.239
3210.40.1.240/2810.40.1.241 – 10.40.1.25410.40.1.255
3310.40.2.0/2810.40.2.1 – 10.40.2.1410.40.2.15
3410.40.2.16/2810.40.2.17 – 10.40.2.3010.40.2.31
3510.40.2.32/2810.40.2.33 – 10.40.2.4610.40.2.47
3610.40.2.48/2810.40.2.49 – 10.40.2.6210.40.2.63
3710.40.2.64/2810.40.2.65 – 10.40.2.7810.40.2.79
3810.40.2.80/2810.40.2.81 – 10.40.2.9410.40.2.95
3910.40.2.96/2810.40.2.97 – 10.40.2.11010.40.2.111
4010.40.2.112/2810.40.2.113 – 10.40.2.12610.40.2.127
4110.40.2.128/2810.40.2.129 – 10.40.2.14210.40.2.143
4210.40.2.144/2810.40.2.145 – 10.40.2.15810.40.2.159
4310.40.2.160/2810.40.2.161 – 10.40.2.17410.40.2.175
4410.40.2.176/2810.40.2.177 – 10.40.2.19010.40.2.191
4510.40.2.192/2810.40.2.193 – 10.40.2.20610.40.2.207
4610.40.2.208/2810.40.2.209 – 10.40.2.22210.40.2.223
4710.40.2.224/2810.40.2.225 – 10.40.2.23810.40.2.239
4810.40.2.240/2810.40.2.241 – 10.40.2.25410.40.2.255
4910.40.3.0/2810.40.3.1 – 10.40.3.1410.40.3.15
5010.40.3.16/2810.40.3.17 – 10.40.3.3010.40.3.31
5110.40.3.32/2810.40.3.33 – 10.40.3.4610.40.3.47
5210.40.3.48/2810.40.3.49 – 10.40.3.6210.40.3.63
5310.40.3.64/2810.40.3.65 – 10.40.3.7810.40.3.79
5410.40.3.80/2810.40.3.81 – 10.40.3.9410.40.3.95
5510.40.3.96/2810.40.3.97 – 10.40.3.11010.40.3.111
5610.40.3.112/2810.40.3.113 – 10.40.3.12610.40.3.127
5710.40.3.128/2810.40.3.129 – 10.40.3.14210.40.3.143
5810.40.3.144/2810.40.3.145 – 10.40.3.15810.40.3.159
5910.40.3.160/2810.40.3.161 – 10.40.3.17410.40.3.175
6010.40.3.176/2810.40.3.177 – 10.40.3.19010.40.3.191
6110.40.3.192/2810.40.3.193 – 10.40.3.20610.40.3.207
6210.40.3.208/2810.40.3.209 – 10.40.3.22210.40.3.223
6310.40.3.224/2810.40.3.225 – 10.40.3.23810.40.3.239
6410.40.3.240/2810.40.3.241 – 10.40.3.25410.40.3.255
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 →