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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)172.16.4.0/22
network172.16.4.0/22
broadcast172.16.7.255
first host172.16.4.1
last host172.16.7.254
subnet mask255.255.252.0
wildcard0.0.3.255
addresses1,024
usable hosts1,022
classB
ipcalc 172.16.4.0/22
address10101100.00010000.00000100.00000000
subnet mask11111111.11111111.11111100.00000000
network10101100.00010000.00000100.00000000
broadcast10101100.00010000.00000111.11111111
green = network part, grey = host part
hex0xac100400
decimal2886730752
reverse dns0.4.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:400

/22 split into /28 · 64 subnets

close ×
#networkhost rangebroadcast
1172.16.4.0/28172.16.4.1 – 172.16.4.14172.16.4.15
2172.16.4.16/28172.16.4.17 – 172.16.4.30172.16.4.31
3172.16.4.32/28172.16.4.33 – 172.16.4.46172.16.4.47
4172.16.4.48/28172.16.4.49 – 172.16.4.62172.16.4.63
5172.16.4.64/28172.16.4.65 – 172.16.4.78172.16.4.79
6172.16.4.80/28172.16.4.81 – 172.16.4.94172.16.4.95
7172.16.4.96/28172.16.4.97 – 172.16.4.110172.16.4.111
8172.16.4.112/28172.16.4.113 – 172.16.4.126172.16.4.127
9172.16.4.128/28172.16.4.129 – 172.16.4.142172.16.4.143
10172.16.4.144/28172.16.4.145 – 172.16.4.158172.16.4.159
11172.16.4.160/28172.16.4.161 – 172.16.4.174172.16.4.175
12172.16.4.176/28172.16.4.177 – 172.16.4.190172.16.4.191
13172.16.4.192/28172.16.4.193 – 172.16.4.206172.16.4.207
14172.16.4.208/28172.16.4.209 – 172.16.4.222172.16.4.223
15172.16.4.224/28172.16.4.225 – 172.16.4.238172.16.4.239
16172.16.4.240/28172.16.4.241 – 172.16.4.254172.16.4.255
17172.16.5.0/28172.16.5.1 – 172.16.5.14172.16.5.15
18172.16.5.16/28172.16.5.17 – 172.16.5.30172.16.5.31
19172.16.5.32/28172.16.5.33 – 172.16.5.46172.16.5.47
20172.16.5.48/28172.16.5.49 – 172.16.5.62172.16.5.63
21172.16.5.64/28172.16.5.65 – 172.16.5.78172.16.5.79
22172.16.5.80/28172.16.5.81 – 172.16.5.94172.16.5.95
23172.16.5.96/28172.16.5.97 – 172.16.5.110172.16.5.111
24172.16.5.112/28172.16.5.113 – 172.16.5.126172.16.5.127
25172.16.5.128/28172.16.5.129 – 172.16.5.142172.16.5.143
26172.16.5.144/28172.16.5.145 – 172.16.5.158172.16.5.159
27172.16.5.160/28172.16.5.161 – 172.16.5.174172.16.5.175
28172.16.5.176/28172.16.5.177 – 172.16.5.190172.16.5.191
29172.16.5.192/28172.16.5.193 – 172.16.5.206172.16.5.207
30172.16.5.208/28172.16.5.209 – 172.16.5.222172.16.5.223
31172.16.5.224/28172.16.5.225 – 172.16.5.238172.16.5.239
32172.16.5.240/28172.16.5.241 – 172.16.5.254172.16.5.255
33172.16.6.0/28172.16.6.1 – 172.16.6.14172.16.6.15
34172.16.6.16/28172.16.6.17 – 172.16.6.30172.16.6.31
35172.16.6.32/28172.16.6.33 – 172.16.6.46172.16.6.47
36172.16.6.48/28172.16.6.49 – 172.16.6.62172.16.6.63
37172.16.6.64/28172.16.6.65 – 172.16.6.78172.16.6.79
38172.16.6.80/28172.16.6.81 – 172.16.6.94172.16.6.95
39172.16.6.96/28172.16.6.97 – 172.16.6.110172.16.6.111
40172.16.6.112/28172.16.6.113 – 172.16.6.126172.16.6.127
41172.16.6.128/28172.16.6.129 – 172.16.6.142172.16.6.143
42172.16.6.144/28172.16.6.145 – 172.16.6.158172.16.6.159
43172.16.6.160/28172.16.6.161 – 172.16.6.174172.16.6.175
44172.16.6.176/28172.16.6.177 – 172.16.6.190172.16.6.191
45172.16.6.192/28172.16.6.193 – 172.16.6.206172.16.6.207
46172.16.6.208/28172.16.6.209 – 172.16.6.222172.16.6.223
47172.16.6.224/28172.16.6.225 – 172.16.6.238172.16.6.239
48172.16.6.240/28172.16.6.241 – 172.16.6.254172.16.6.255
49172.16.7.0/28172.16.7.1 – 172.16.7.14172.16.7.15
50172.16.7.16/28172.16.7.17 – 172.16.7.30172.16.7.31
51172.16.7.32/28172.16.7.33 – 172.16.7.46172.16.7.47
52172.16.7.48/28172.16.7.49 – 172.16.7.62172.16.7.63
53172.16.7.64/28172.16.7.65 – 172.16.7.78172.16.7.79
54172.16.7.80/28172.16.7.81 – 172.16.7.94172.16.7.95
55172.16.7.96/28172.16.7.97 – 172.16.7.110172.16.7.111
56172.16.7.112/28172.16.7.113 – 172.16.7.126172.16.7.127
57172.16.7.128/28172.16.7.129 – 172.16.7.142172.16.7.143
58172.16.7.144/28172.16.7.145 – 172.16.7.158172.16.7.159
59172.16.7.160/28172.16.7.161 – 172.16.7.174172.16.7.175
60172.16.7.176/28172.16.7.177 – 172.16.7.190172.16.7.191
61172.16.7.192/28172.16.7.193 – 172.16.7.206172.16.7.207
62172.16.7.208/28172.16.7.209 – 172.16.7.222172.16.7.223
63172.16.7.224/28172.16.7.225 – 172.16.7.238172.16.7.239
64172.16.7.240/28172.16.7.241 – 172.16.7.254172.16.7.255
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 →