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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)172.16.11.0/24
network172.16.11.0/24
broadcast172.16.11.255
first host172.16.11.1
last host172.16.11.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classB
ipcalc 172.16.11.0/24
address10101100.00010000.00001011.00000000
subnet mask11111111.11111111.11111111.00000000
network10101100.00010000.00001011.00000000
broadcast10101100.00010000.00001011.11111111
green = network part, grey = host part
hex0xac100b00
decimal2886732544
reverse dns0.11.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:b00

/24 split into /29 · 32 subnets

close ×
#networkhost rangebroadcast
1172.16.11.0/29172.16.11.1 – 172.16.11.6172.16.11.7
2172.16.11.8/29172.16.11.9 – 172.16.11.14172.16.11.15
3172.16.11.16/29172.16.11.17 – 172.16.11.22172.16.11.23
4172.16.11.24/29172.16.11.25 – 172.16.11.30172.16.11.31
5172.16.11.32/29172.16.11.33 – 172.16.11.38172.16.11.39
6172.16.11.40/29172.16.11.41 – 172.16.11.46172.16.11.47
7172.16.11.48/29172.16.11.49 – 172.16.11.54172.16.11.55
8172.16.11.56/29172.16.11.57 – 172.16.11.62172.16.11.63
9172.16.11.64/29172.16.11.65 – 172.16.11.70172.16.11.71
10172.16.11.72/29172.16.11.73 – 172.16.11.78172.16.11.79
11172.16.11.80/29172.16.11.81 – 172.16.11.86172.16.11.87
12172.16.11.88/29172.16.11.89 – 172.16.11.94172.16.11.95
13172.16.11.96/29172.16.11.97 – 172.16.11.102172.16.11.103
14172.16.11.104/29172.16.11.105 – 172.16.11.110172.16.11.111
15172.16.11.112/29172.16.11.113 – 172.16.11.118172.16.11.119
16172.16.11.120/29172.16.11.121 – 172.16.11.126172.16.11.127
17172.16.11.128/29172.16.11.129 – 172.16.11.134172.16.11.135
18172.16.11.136/29172.16.11.137 – 172.16.11.142172.16.11.143
19172.16.11.144/29172.16.11.145 – 172.16.11.150172.16.11.151
20172.16.11.152/29172.16.11.153 – 172.16.11.158172.16.11.159
21172.16.11.160/29172.16.11.161 – 172.16.11.166172.16.11.167
22172.16.11.168/29172.16.11.169 – 172.16.11.174172.16.11.175
23172.16.11.176/29172.16.11.177 – 172.16.11.182172.16.11.183
24172.16.11.184/29172.16.11.185 – 172.16.11.190172.16.11.191
25172.16.11.192/29172.16.11.193 – 172.16.11.198172.16.11.199
26172.16.11.200/29172.16.11.201 – 172.16.11.206172.16.11.207
27172.16.11.208/29172.16.11.209 – 172.16.11.214172.16.11.215
28172.16.11.216/29172.16.11.217 – 172.16.11.222172.16.11.223
29172.16.11.224/29172.16.11.225 – 172.16.11.230172.16.11.231
30172.16.11.232/29172.16.11.233 – 172.16.11.238172.16.11.239
31172.16.11.240/29172.16.11.241 – 172.16.11.246172.16.11.247
32172.16.11.248/29172.16.11.249 – 172.16.11.254172.16.11.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /24
/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-
/22255.255.252.01,0241,022-
/23255.255.254.0512510-
/24255.255.255.02562541
/25255.255.255.1281281262 split →
/26255.255.255.19264624 split →
/27255.255.255.22432308 split →
/28255.255.255.240161416 split →
/29255.255.255.2488632 split →
/30255.255.255.2524264 split →
/31255.255.255.25422128 split →
/32255.255.255.25511256 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 →