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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)10.37.28.0/22
network10.37.28.0/22
broadcast10.37.31.255
first host10.37.28.1
last host10.37.31.254
subnet mask255.255.252.0
wildcard0.0.3.255
addresses1,024
usable hosts1,022
classA
ipcalc 10.37.28.0/22
address00001010.00100101.00011100.00000000
subnet mask11111111.11111111.11111100.00000000
network00001010.00100101.00011100.00000000
broadcast00001010.00100101.00011111.11111111
green = network part, grey = host part
hex0x0a251c00
decimal170204160
reverse dns0.28.37.10.in-addr.arpa
ipv4-mapped::ffff:a25:1c00

/22 split into /28 · 64 subnets

close ×
#networkhost rangebroadcast
110.37.28.0/2810.37.28.1 – 10.37.28.1410.37.28.15
210.37.28.16/2810.37.28.17 – 10.37.28.3010.37.28.31
310.37.28.32/2810.37.28.33 – 10.37.28.4610.37.28.47
410.37.28.48/2810.37.28.49 – 10.37.28.6210.37.28.63
510.37.28.64/2810.37.28.65 – 10.37.28.7810.37.28.79
610.37.28.80/2810.37.28.81 – 10.37.28.9410.37.28.95
710.37.28.96/2810.37.28.97 – 10.37.28.11010.37.28.111
810.37.28.112/2810.37.28.113 – 10.37.28.12610.37.28.127
910.37.28.128/2810.37.28.129 – 10.37.28.14210.37.28.143
1010.37.28.144/2810.37.28.145 – 10.37.28.15810.37.28.159
1110.37.28.160/2810.37.28.161 – 10.37.28.17410.37.28.175
1210.37.28.176/2810.37.28.177 – 10.37.28.19010.37.28.191
1310.37.28.192/2810.37.28.193 – 10.37.28.20610.37.28.207
1410.37.28.208/2810.37.28.209 – 10.37.28.22210.37.28.223
1510.37.28.224/2810.37.28.225 – 10.37.28.23810.37.28.239
1610.37.28.240/2810.37.28.241 – 10.37.28.25410.37.28.255
1710.37.29.0/2810.37.29.1 – 10.37.29.1410.37.29.15
1810.37.29.16/2810.37.29.17 – 10.37.29.3010.37.29.31
1910.37.29.32/2810.37.29.33 – 10.37.29.4610.37.29.47
2010.37.29.48/2810.37.29.49 – 10.37.29.6210.37.29.63
2110.37.29.64/2810.37.29.65 – 10.37.29.7810.37.29.79
2210.37.29.80/2810.37.29.81 – 10.37.29.9410.37.29.95
2310.37.29.96/2810.37.29.97 – 10.37.29.11010.37.29.111
2410.37.29.112/2810.37.29.113 – 10.37.29.12610.37.29.127
2510.37.29.128/2810.37.29.129 – 10.37.29.14210.37.29.143
2610.37.29.144/2810.37.29.145 – 10.37.29.15810.37.29.159
2710.37.29.160/2810.37.29.161 – 10.37.29.17410.37.29.175
2810.37.29.176/2810.37.29.177 – 10.37.29.19010.37.29.191
2910.37.29.192/2810.37.29.193 – 10.37.29.20610.37.29.207
3010.37.29.208/2810.37.29.209 – 10.37.29.22210.37.29.223
3110.37.29.224/2810.37.29.225 – 10.37.29.23810.37.29.239
3210.37.29.240/2810.37.29.241 – 10.37.29.25410.37.29.255
3310.37.30.0/2810.37.30.1 – 10.37.30.1410.37.30.15
3410.37.30.16/2810.37.30.17 – 10.37.30.3010.37.30.31
3510.37.30.32/2810.37.30.33 – 10.37.30.4610.37.30.47
3610.37.30.48/2810.37.30.49 – 10.37.30.6210.37.30.63
3710.37.30.64/2810.37.30.65 – 10.37.30.7810.37.30.79
3810.37.30.80/2810.37.30.81 – 10.37.30.9410.37.30.95
3910.37.30.96/2810.37.30.97 – 10.37.30.11010.37.30.111
4010.37.30.112/2810.37.30.113 – 10.37.30.12610.37.30.127
4110.37.30.128/2810.37.30.129 – 10.37.30.14210.37.30.143
4210.37.30.144/2810.37.30.145 – 10.37.30.15810.37.30.159
4310.37.30.160/2810.37.30.161 – 10.37.30.17410.37.30.175
4410.37.30.176/2810.37.30.177 – 10.37.30.19010.37.30.191
4510.37.30.192/2810.37.30.193 – 10.37.30.20610.37.30.207
4610.37.30.208/2810.37.30.209 – 10.37.30.22210.37.30.223
4710.37.30.224/2810.37.30.225 – 10.37.30.23810.37.30.239
4810.37.30.240/2810.37.30.241 – 10.37.30.25410.37.30.255
4910.37.31.0/2810.37.31.1 – 10.37.31.1410.37.31.15
5010.37.31.16/2810.37.31.17 – 10.37.31.3010.37.31.31
5110.37.31.32/2810.37.31.33 – 10.37.31.4610.37.31.47
5210.37.31.48/2810.37.31.49 – 10.37.31.6210.37.31.63
5310.37.31.64/2810.37.31.65 – 10.37.31.7810.37.31.79
5410.37.31.80/2810.37.31.81 – 10.37.31.9410.37.31.95
5510.37.31.96/2810.37.31.97 – 10.37.31.11010.37.31.111
5610.37.31.112/2810.37.31.113 – 10.37.31.12610.37.31.127
5710.37.31.128/2810.37.31.129 – 10.37.31.14210.37.31.143
5810.37.31.144/2810.37.31.145 – 10.37.31.15810.37.31.159
5910.37.31.160/2810.37.31.161 – 10.37.31.17410.37.31.175
6010.37.31.176/2810.37.31.177 – 10.37.31.19010.37.31.191
6110.37.31.192/2810.37.31.193 – 10.37.31.20610.37.31.207
6210.37.31.208/2810.37.31.209 – 10.37.31.22210.37.31.223
6310.37.31.224/2810.37.31.225 – 10.37.31.23810.37.31.239
6410.37.31.240/2810.37.31.241 – 10.37.31.25410.37.31.255
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 →