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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)10.3.240.0/22
network10.3.240.0/22
broadcast10.3.243.255
first host10.3.240.1
last host10.3.243.254
subnet mask255.255.252.0
wildcard0.0.3.255
addresses1,024
usable hosts1,022
classA
ipcalc 10.3.240.0/22
address00001010.00000011.11110000.00000000
subnet mask11111111.11111111.11111100.00000000
network00001010.00000011.11110000.00000000
broadcast00001010.00000011.11110011.11111111
green = network part, grey = host part
hex0x0a03f000
decimal168030208
reverse dns0.240.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:f000

/22 split into /28 · 64 subnets

close ×
#networkhost rangebroadcast
110.3.240.0/2810.3.240.1 – 10.3.240.1410.3.240.15
210.3.240.16/2810.3.240.17 – 10.3.240.3010.3.240.31
310.3.240.32/2810.3.240.33 – 10.3.240.4610.3.240.47
410.3.240.48/2810.3.240.49 – 10.3.240.6210.3.240.63
510.3.240.64/2810.3.240.65 – 10.3.240.7810.3.240.79
610.3.240.80/2810.3.240.81 – 10.3.240.9410.3.240.95
710.3.240.96/2810.3.240.97 – 10.3.240.11010.3.240.111
810.3.240.112/2810.3.240.113 – 10.3.240.12610.3.240.127
910.3.240.128/2810.3.240.129 – 10.3.240.14210.3.240.143
1010.3.240.144/2810.3.240.145 – 10.3.240.15810.3.240.159
1110.3.240.160/2810.3.240.161 – 10.3.240.17410.3.240.175
1210.3.240.176/2810.3.240.177 – 10.3.240.19010.3.240.191
1310.3.240.192/2810.3.240.193 – 10.3.240.20610.3.240.207
1410.3.240.208/2810.3.240.209 – 10.3.240.22210.3.240.223
1510.3.240.224/2810.3.240.225 – 10.3.240.23810.3.240.239
1610.3.240.240/2810.3.240.241 – 10.3.240.25410.3.240.255
1710.3.241.0/2810.3.241.1 – 10.3.241.1410.3.241.15
1810.3.241.16/2810.3.241.17 – 10.3.241.3010.3.241.31
1910.3.241.32/2810.3.241.33 – 10.3.241.4610.3.241.47
2010.3.241.48/2810.3.241.49 – 10.3.241.6210.3.241.63
2110.3.241.64/2810.3.241.65 – 10.3.241.7810.3.241.79
2210.3.241.80/2810.3.241.81 – 10.3.241.9410.3.241.95
2310.3.241.96/2810.3.241.97 – 10.3.241.11010.3.241.111
2410.3.241.112/2810.3.241.113 – 10.3.241.12610.3.241.127
2510.3.241.128/2810.3.241.129 – 10.3.241.14210.3.241.143
2610.3.241.144/2810.3.241.145 – 10.3.241.15810.3.241.159
2710.3.241.160/2810.3.241.161 – 10.3.241.17410.3.241.175
2810.3.241.176/2810.3.241.177 – 10.3.241.19010.3.241.191
2910.3.241.192/2810.3.241.193 – 10.3.241.20610.3.241.207
3010.3.241.208/2810.3.241.209 – 10.3.241.22210.3.241.223
3110.3.241.224/2810.3.241.225 – 10.3.241.23810.3.241.239
3210.3.241.240/2810.3.241.241 – 10.3.241.25410.3.241.255
3310.3.242.0/2810.3.242.1 – 10.3.242.1410.3.242.15
3410.3.242.16/2810.3.242.17 – 10.3.242.3010.3.242.31
3510.3.242.32/2810.3.242.33 – 10.3.242.4610.3.242.47
3610.3.242.48/2810.3.242.49 – 10.3.242.6210.3.242.63
3710.3.242.64/2810.3.242.65 – 10.3.242.7810.3.242.79
3810.3.242.80/2810.3.242.81 – 10.3.242.9410.3.242.95
3910.3.242.96/2810.3.242.97 – 10.3.242.11010.3.242.111
4010.3.242.112/2810.3.242.113 – 10.3.242.12610.3.242.127
4110.3.242.128/2810.3.242.129 – 10.3.242.14210.3.242.143
4210.3.242.144/2810.3.242.145 – 10.3.242.15810.3.242.159
4310.3.242.160/2810.3.242.161 – 10.3.242.17410.3.242.175
4410.3.242.176/2810.3.242.177 – 10.3.242.19010.3.242.191
4510.3.242.192/2810.3.242.193 – 10.3.242.20610.3.242.207
4610.3.242.208/2810.3.242.209 – 10.3.242.22210.3.242.223
4710.3.242.224/2810.3.242.225 – 10.3.242.23810.3.242.239
4810.3.242.240/2810.3.242.241 – 10.3.242.25410.3.242.255
4910.3.243.0/2810.3.243.1 – 10.3.243.1410.3.243.15
5010.3.243.16/2810.3.243.17 – 10.3.243.3010.3.243.31
5110.3.243.32/2810.3.243.33 – 10.3.243.4610.3.243.47
5210.3.243.48/2810.3.243.49 – 10.3.243.6210.3.243.63
5310.3.243.64/2810.3.243.65 – 10.3.243.7810.3.243.79
5410.3.243.80/2810.3.243.81 – 10.3.243.9410.3.243.95
5510.3.243.96/2810.3.243.97 – 10.3.243.11010.3.243.111
5610.3.243.112/2810.3.243.113 – 10.3.243.12610.3.243.127
5710.3.243.128/2810.3.243.129 – 10.3.243.14210.3.243.143
5810.3.243.144/2810.3.243.145 – 10.3.243.15810.3.243.159
5910.3.243.160/2810.3.243.161 – 10.3.243.17410.3.243.175
6010.3.243.176/2810.3.243.177 – 10.3.243.19010.3.243.191
6110.3.243.192/2810.3.243.193 – 10.3.243.20610.3.243.207
6210.3.243.208/2810.3.243.209 – 10.3.243.22210.3.243.223
6310.3.243.224/2810.3.243.225 – 10.3.243.23810.3.243.239
6410.3.243.240/2810.3.243.241 – 10.3.243.25410.3.243.255
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 →