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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)10.40.136.0/22
network10.40.136.0/22
broadcast10.40.139.255
first host10.40.136.1
last host10.40.139.254
subnet mask255.255.252.0
wildcard0.0.3.255
addresses1,024
usable hosts1,022
classA
ipcalc 10.40.136.0/22
address00001010.00101000.10001000.00000000
subnet mask11111111.11111111.11111100.00000000
network00001010.00101000.10001000.00000000
broadcast00001010.00101000.10001011.11111111
green = network part, grey = host part
hex0x0a288800
decimal170428416
reverse dns0.136.40.10.in-addr.arpa
ipv4-mapped::ffff:a28:8800

/22 split into /28 · 64 subnets

close ×
#networkhost rangebroadcast
110.40.136.0/2810.40.136.1 – 10.40.136.1410.40.136.15
210.40.136.16/2810.40.136.17 – 10.40.136.3010.40.136.31
310.40.136.32/2810.40.136.33 – 10.40.136.4610.40.136.47
410.40.136.48/2810.40.136.49 – 10.40.136.6210.40.136.63
510.40.136.64/2810.40.136.65 – 10.40.136.7810.40.136.79
610.40.136.80/2810.40.136.81 – 10.40.136.9410.40.136.95
710.40.136.96/2810.40.136.97 – 10.40.136.11010.40.136.111
810.40.136.112/2810.40.136.113 – 10.40.136.12610.40.136.127
910.40.136.128/2810.40.136.129 – 10.40.136.14210.40.136.143
1010.40.136.144/2810.40.136.145 – 10.40.136.15810.40.136.159
1110.40.136.160/2810.40.136.161 – 10.40.136.17410.40.136.175
1210.40.136.176/2810.40.136.177 – 10.40.136.19010.40.136.191
1310.40.136.192/2810.40.136.193 – 10.40.136.20610.40.136.207
1410.40.136.208/2810.40.136.209 – 10.40.136.22210.40.136.223
1510.40.136.224/2810.40.136.225 – 10.40.136.23810.40.136.239
1610.40.136.240/2810.40.136.241 – 10.40.136.25410.40.136.255
1710.40.137.0/2810.40.137.1 – 10.40.137.1410.40.137.15
1810.40.137.16/2810.40.137.17 – 10.40.137.3010.40.137.31
1910.40.137.32/2810.40.137.33 – 10.40.137.4610.40.137.47
2010.40.137.48/2810.40.137.49 – 10.40.137.6210.40.137.63
2110.40.137.64/2810.40.137.65 – 10.40.137.7810.40.137.79
2210.40.137.80/2810.40.137.81 – 10.40.137.9410.40.137.95
2310.40.137.96/2810.40.137.97 – 10.40.137.11010.40.137.111
2410.40.137.112/2810.40.137.113 – 10.40.137.12610.40.137.127
2510.40.137.128/2810.40.137.129 – 10.40.137.14210.40.137.143
2610.40.137.144/2810.40.137.145 – 10.40.137.15810.40.137.159
2710.40.137.160/2810.40.137.161 – 10.40.137.17410.40.137.175
2810.40.137.176/2810.40.137.177 – 10.40.137.19010.40.137.191
2910.40.137.192/2810.40.137.193 – 10.40.137.20610.40.137.207
3010.40.137.208/2810.40.137.209 – 10.40.137.22210.40.137.223
3110.40.137.224/2810.40.137.225 – 10.40.137.23810.40.137.239
3210.40.137.240/2810.40.137.241 – 10.40.137.25410.40.137.255
3310.40.138.0/2810.40.138.1 – 10.40.138.1410.40.138.15
3410.40.138.16/2810.40.138.17 – 10.40.138.3010.40.138.31
3510.40.138.32/2810.40.138.33 – 10.40.138.4610.40.138.47
3610.40.138.48/2810.40.138.49 – 10.40.138.6210.40.138.63
3710.40.138.64/2810.40.138.65 – 10.40.138.7810.40.138.79
3810.40.138.80/2810.40.138.81 – 10.40.138.9410.40.138.95
3910.40.138.96/2810.40.138.97 – 10.40.138.11010.40.138.111
4010.40.138.112/2810.40.138.113 – 10.40.138.12610.40.138.127
4110.40.138.128/2810.40.138.129 – 10.40.138.14210.40.138.143
4210.40.138.144/2810.40.138.145 – 10.40.138.15810.40.138.159
4310.40.138.160/2810.40.138.161 – 10.40.138.17410.40.138.175
4410.40.138.176/2810.40.138.177 – 10.40.138.19010.40.138.191
4510.40.138.192/2810.40.138.193 – 10.40.138.20610.40.138.207
4610.40.138.208/2810.40.138.209 – 10.40.138.22210.40.138.223
4710.40.138.224/2810.40.138.225 – 10.40.138.23810.40.138.239
4810.40.138.240/2810.40.138.241 – 10.40.138.25410.40.138.255
4910.40.139.0/2810.40.139.1 – 10.40.139.1410.40.139.15
5010.40.139.16/2810.40.139.17 – 10.40.139.3010.40.139.31
5110.40.139.32/2810.40.139.33 – 10.40.139.4610.40.139.47
5210.40.139.48/2810.40.139.49 – 10.40.139.6210.40.139.63
5310.40.139.64/2810.40.139.65 – 10.40.139.7810.40.139.79
5410.40.139.80/2810.40.139.81 – 10.40.139.9410.40.139.95
5510.40.139.96/2810.40.139.97 – 10.40.139.11010.40.139.111
5610.40.139.112/2810.40.139.113 – 10.40.139.12610.40.139.127
5710.40.139.128/2810.40.139.129 – 10.40.139.14210.40.139.143
5810.40.139.144/2810.40.139.145 – 10.40.139.15810.40.139.159
5910.40.139.160/2810.40.139.161 – 10.40.139.17410.40.139.175
6010.40.139.176/2810.40.139.177 – 10.40.139.19010.40.139.191
6110.40.139.192/2810.40.139.193 – 10.40.139.20610.40.139.207
6210.40.139.208/2810.40.139.209 – 10.40.139.22210.40.139.223
6310.40.139.224/2810.40.139.225 – 10.40.139.23810.40.139.239
6410.40.139.240/2810.40.139.241 – 10.40.139.25410.40.139.255
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 →