ip
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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)172.16.13.0/24
network172.16.13.0/24
broadcast172.16.13.255
first host172.16.13.1
last host172.16.13.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classB
ipcalc 172.16.13.0/24
address10101100.00010000.00001101.00000000
subnet mask11111111.11111111.11111111.00000000
network10101100.00010000.00001101.00000000
broadcast10101100.00010000.00001101.11111111
green = network part, grey = host part
hex0xac100d00
decimal2886733056
reverse dns0.13.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:d00

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
1172.16.13.0/30172.16.13.1 – 172.16.13.2172.16.13.3
2172.16.13.4/30172.16.13.5 – 172.16.13.6172.16.13.7
3172.16.13.8/30172.16.13.9 – 172.16.13.10172.16.13.11
4172.16.13.12/30172.16.13.13 – 172.16.13.14172.16.13.15
5172.16.13.16/30172.16.13.17 – 172.16.13.18172.16.13.19
6172.16.13.20/30172.16.13.21 – 172.16.13.22172.16.13.23
7172.16.13.24/30172.16.13.25 – 172.16.13.26172.16.13.27
8172.16.13.28/30172.16.13.29 – 172.16.13.30172.16.13.31
9172.16.13.32/30172.16.13.33 – 172.16.13.34172.16.13.35
10172.16.13.36/30172.16.13.37 – 172.16.13.38172.16.13.39
11172.16.13.40/30172.16.13.41 – 172.16.13.42172.16.13.43
12172.16.13.44/30172.16.13.45 – 172.16.13.46172.16.13.47
13172.16.13.48/30172.16.13.49 – 172.16.13.50172.16.13.51
14172.16.13.52/30172.16.13.53 – 172.16.13.54172.16.13.55
15172.16.13.56/30172.16.13.57 – 172.16.13.58172.16.13.59
16172.16.13.60/30172.16.13.61 – 172.16.13.62172.16.13.63
17172.16.13.64/30172.16.13.65 – 172.16.13.66172.16.13.67
18172.16.13.68/30172.16.13.69 – 172.16.13.70172.16.13.71
19172.16.13.72/30172.16.13.73 – 172.16.13.74172.16.13.75
20172.16.13.76/30172.16.13.77 – 172.16.13.78172.16.13.79
21172.16.13.80/30172.16.13.81 – 172.16.13.82172.16.13.83
22172.16.13.84/30172.16.13.85 – 172.16.13.86172.16.13.87
23172.16.13.88/30172.16.13.89 – 172.16.13.90172.16.13.91
24172.16.13.92/30172.16.13.93 – 172.16.13.94172.16.13.95
25172.16.13.96/30172.16.13.97 – 172.16.13.98172.16.13.99
26172.16.13.100/30172.16.13.101 – 172.16.13.102172.16.13.103
27172.16.13.104/30172.16.13.105 – 172.16.13.106172.16.13.107
28172.16.13.108/30172.16.13.109 – 172.16.13.110172.16.13.111
29172.16.13.112/30172.16.13.113 – 172.16.13.114172.16.13.115
30172.16.13.116/30172.16.13.117 – 172.16.13.118172.16.13.119
31172.16.13.120/30172.16.13.121 – 172.16.13.122172.16.13.123
32172.16.13.124/30172.16.13.125 – 172.16.13.126172.16.13.127
33172.16.13.128/30172.16.13.129 – 172.16.13.130172.16.13.131
34172.16.13.132/30172.16.13.133 – 172.16.13.134172.16.13.135
35172.16.13.136/30172.16.13.137 – 172.16.13.138172.16.13.139
36172.16.13.140/30172.16.13.141 – 172.16.13.142172.16.13.143
37172.16.13.144/30172.16.13.145 – 172.16.13.146172.16.13.147
38172.16.13.148/30172.16.13.149 – 172.16.13.150172.16.13.151
39172.16.13.152/30172.16.13.153 – 172.16.13.154172.16.13.155
40172.16.13.156/30172.16.13.157 – 172.16.13.158172.16.13.159
41172.16.13.160/30172.16.13.161 – 172.16.13.162172.16.13.163
42172.16.13.164/30172.16.13.165 – 172.16.13.166172.16.13.167
43172.16.13.168/30172.16.13.169 – 172.16.13.170172.16.13.171
44172.16.13.172/30172.16.13.173 – 172.16.13.174172.16.13.175
45172.16.13.176/30172.16.13.177 – 172.16.13.178172.16.13.179
46172.16.13.180/30172.16.13.181 – 172.16.13.182172.16.13.183
47172.16.13.184/30172.16.13.185 – 172.16.13.186172.16.13.187
48172.16.13.188/30172.16.13.189 – 172.16.13.190172.16.13.191
49172.16.13.192/30172.16.13.193 – 172.16.13.194172.16.13.195
50172.16.13.196/30172.16.13.197 – 172.16.13.198172.16.13.199
51172.16.13.200/30172.16.13.201 – 172.16.13.202172.16.13.203
52172.16.13.204/30172.16.13.205 – 172.16.13.206172.16.13.207
53172.16.13.208/30172.16.13.209 – 172.16.13.210172.16.13.211
54172.16.13.212/30172.16.13.213 – 172.16.13.214172.16.13.215
55172.16.13.216/30172.16.13.217 – 172.16.13.218172.16.13.219
56172.16.13.220/30172.16.13.221 – 172.16.13.222172.16.13.223
57172.16.13.224/30172.16.13.225 – 172.16.13.226172.16.13.227
58172.16.13.228/30172.16.13.229 – 172.16.13.230172.16.13.231
59172.16.13.232/30172.16.13.233 – 172.16.13.234172.16.13.235
60172.16.13.236/30172.16.13.237 – 172.16.13.238172.16.13.239
61172.16.13.240/30172.16.13.241 – 172.16.13.242172.16.13.243
62172.16.13.244/30172.16.13.245 – 172.16.13.246172.16.13.247
63172.16.13.248/30172.16.13.249 – 172.16.13.250172.16.13.251
64172.16.13.252/30172.16.13.253 – 172.16.13.254172.16.13.255
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 →