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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)10.65.64.0/22
network10.65.64.0/22
broadcast10.65.67.255
first host10.65.64.1
last host10.65.67.254
subnet mask255.255.252.0
wildcard0.0.3.255
addresses1,024
usable hosts1,022
classA
ipcalc 10.65.64.0/22
address00001010.01000001.01000000.00000000
subnet mask11111111.11111111.11111100.00000000
network00001010.01000001.01000000.00000000
broadcast00001010.01000001.01000011.11111111
green = network part, grey = host part
hex0x0a414000
decimal172048384
reverse dns0.64.65.10.in-addr.arpa
ipv4-mapped::ffff:a41:4000

/22 split into /28 · 64 subnets

close ×
#networkhost rangebroadcast
110.65.64.0/2810.65.64.1 – 10.65.64.1410.65.64.15
210.65.64.16/2810.65.64.17 – 10.65.64.3010.65.64.31
310.65.64.32/2810.65.64.33 – 10.65.64.4610.65.64.47
410.65.64.48/2810.65.64.49 – 10.65.64.6210.65.64.63
510.65.64.64/2810.65.64.65 – 10.65.64.7810.65.64.79
610.65.64.80/2810.65.64.81 – 10.65.64.9410.65.64.95
710.65.64.96/2810.65.64.97 – 10.65.64.11010.65.64.111
810.65.64.112/2810.65.64.113 – 10.65.64.12610.65.64.127
910.65.64.128/2810.65.64.129 – 10.65.64.14210.65.64.143
1010.65.64.144/2810.65.64.145 – 10.65.64.15810.65.64.159
1110.65.64.160/2810.65.64.161 – 10.65.64.17410.65.64.175
1210.65.64.176/2810.65.64.177 – 10.65.64.19010.65.64.191
1310.65.64.192/2810.65.64.193 – 10.65.64.20610.65.64.207
1410.65.64.208/2810.65.64.209 – 10.65.64.22210.65.64.223
1510.65.64.224/2810.65.64.225 – 10.65.64.23810.65.64.239
1610.65.64.240/2810.65.64.241 – 10.65.64.25410.65.64.255
1710.65.65.0/2810.65.65.1 – 10.65.65.1410.65.65.15
1810.65.65.16/2810.65.65.17 – 10.65.65.3010.65.65.31
1910.65.65.32/2810.65.65.33 – 10.65.65.4610.65.65.47
2010.65.65.48/2810.65.65.49 – 10.65.65.6210.65.65.63
2110.65.65.64/2810.65.65.65 – 10.65.65.7810.65.65.79
2210.65.65.80/2810.65.65.81 – 10.65.65.9410.65.65.95
2310.65.65.96/2810.65.65.97 – 10.65.65.11010.65.65.111
2410.65.65.112/2810.65.65.113 – 10.65.65.12610.65.65.127
2510.65.65.128/2810.65.65.129 – 10.65.65.14210.65.65.143
2610.65.65.144/2810.65.65.145 – 10.65.65.15810.65.65.159
2710.65.65.160/2810.65.65.161 – 10.65.65.17410.65.65.175
2810.65.65.176/2810.65.65.177 – 10.65.65.19010.65.65.191
2910.65.65.192/2810.65.65.193 – 10.65.65.20610.65.65.207
3010.65.65.208/2810.65.65.209 – 10.65.65.22210.65.65.223
3110.65.65.224/2810.65.65.225 – 10.65.65.23810.65.65.239
3210.65.65.240/2810.65.65.241 – 10.65.65.25410.65.65.255
3310.65.66.0/2810.65.66.1 – 10.65.66.1410.65.66.15
3410.65.66.16/2810.65.66.17 – 10.65.66.3010.65.66.31
3510.65.66.32/2810.65.66.33 – 10.65.66.4610.65.66.47
3610.65.66.48/2810.65.66.49 – 10.65.66.6210.65.66.63
3710.65.66.64/2810.65.66.65 – 10.65.66.7810.65.66.79
3810.65.66.80/2810.65.66.81 – 10.65.66.9410.65.66.95
3910.65.66.96/2810.65.66.97 – 10.65.66.11010.65.66.111
4010.65.66.112/2810.65.66.113 – 10.65.66.12610.65.66.127
4110.65.66.128/2810.65.66.129 – 10.65.66.14210.65.66.143
4210.65.66.144/2810.65.66.145 – 10.65.66.15810.65.66.159
4310.65.66.160/2810.65.66.161 – 10.65.66.17410.65.66.175
4410.65.66.176/2810.65.66.177 – 10.65.66.19010.65.66.191
4510.65.66.192/2810.65.66.193 – 10.65.66.20610.65.66.207
4610.65.66.208/2810.65.66.209 – 10.65.66.22210.65.66.223
4710.65.66.224/2810.65.66.225 – 10.65.66.23810.65.66.239
4810.65.66.240/2810.65.66.241 – 10.65.66.25410.65.66.255
4910.65.67.0/2810.65.67.1 – 10.65.67.1410.65.67.15
5010.65.67.16/2810.65.67.17 – 10.65.67.3010.65.67.31
5110.65.67.32/2810.65.67.33 – 10.65.67.4610.65.67.47
5210.65.67.48/2810.65.67.49 – 10.65.67.6210.65.67.63
5310.65.67.64/2810.65.67.65 – 10.65.67.7810.65.67.79
5410.65.67.80/2810.65.67.81 – 10.65.67.9410.65.67.95
5510.65.67.96/2810.65.67.97 – 10.65.67.11010.65.67.111
5610.65.67.112/2810.65.67.113 – 10.65.67.12610.65.67.127
5710.65.67.128/2810.65.67.129 – 10.65.67.14210.65.67.143
5810.65.67.144/2810.65.67.145 – 10.65.67.15810.65.67.159
5910.65.67.160/2810.65.67.161 – 10.65.67.17410.65.67.175
6010.65.67.176/2810.65.67.177 – 10.65.67.19010.65.67.191
6110.65.67.192/2810.65.67.193 – 10.65.67.20610.65.67.207
6210.65.67.208/2810.65.67.209 – 10.65.67.22210.65.67.223
6310.65.67.224/2810.65.67.225 – 10.65.67.23810.65.67.239
6410.65.67.240/2810.65.67.241 – 10.65.67.25410.65.67.255
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 →