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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)172.16.13.128/26
network172.16.13.128/26
broadcast172.16.13.191
first host172.16.13.129
last host172.16.13.190
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classB
ipcalc 172.16.13.128/26
address10101100.00010000.00001101.10000000
subnet mask11111111.11111111.11111111.11000000
network10101100.00010000.00001101.10000000
broadcast10101100.00010000.00001101.10111111
green = network part, grey = host part
hex0xac100d80
decimal2886733184
reverse dns128.13.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:d80

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
1172.16.13.128/32172.16.13.128 – 172.16.13.128172.16.13.128
2172.16.13.129/32172.16.13.129 – 172.16.13.129172.16.13.129
3172.16.13.130/32172.16.13.130 – 172.16.13.130172.16.13.130
4172.16.13.131/32172.16.13.131 – 172.16.13.131172.16.13.131
5172.16.13.132/32172.16.13.132 – 172.16.13.132172.16.13.132
6172.16.13.133/32172.16.13.133 – 172.16.13.133172.16.13.133
7172.16.13.134/32172.16.13.134 – 172.16.13.134172.16.13.134
8172.16.13.135/32172.16.13.135 – 172.16.13.135172.16.13.135
9172.16.13.136/32172.16.13.136 – 172.16.13.136172.16.13.136
10172.16.13.137/32172.16.13.137 – 172.16.13.137172.16.13.137
11172.16.13.138/32172.16.13.138 – 172.16.13.138172.16.13.138
12172.16.13.139/32172.16.13.139 – 172.16.13.139172.16.13.139
13172.16.13.140/32172.16.13.140 – 172.16.13.140172.16.13.140
14172.16.13.141/32172.16.13.141 – 172.16.13.141172.16.13.141
15172.16.13.142/32172.16.13.142 – 172.16.13.142172.16.13.142
16172.16.13.143/32172.16.13.143 – 172.16.13.143172.16.13.143
17172.16.13.144/32172.16.13.144 – 172.16.13.144172.16.13.144
18172.16.13.145/32172.16.13.145 – 172.16.13.145172.16.13.145
19172.16.13.146/32172.16.13.146 – 172.16.13.146172.16.13.146
20172.16.13.147/32172.16.13.147 – 172.16.13.147172.16.13.147
21172.16.13.148/32172.16.13.148 – 172.16.13.148172.16.13.148
22172.16.13.149/32172.16.13.149 – 172.16.13.149172.16.13.149
23172.16.13.150/32172.16.13.150 – 172.16.13.150172.16.13.150
24172.16.13.151/32172.16.13.151 – 172.16.13.151172.16.13.151
25172.16.13.152/32172.16.13.152 – 172.16.13.152172.16.13.152
26172.16.13.153/32172.16.13.153 – 172.16.13.153172.16.13.153
27172.16.13.154/32172.16.13.154 – 172.16.13.154172.16.13.154
28172.16.13.155/32172.16.13.155 – 172.16.13.155172.16.13.155
29172.16.13.156/32172.16.13.156 – 172.16.13.156172.16.13.156
30172.16.13.157/32172.16.13.157 – 172.16.13.157172.16.13.157
31172.16.13.158/32172.16.13.158 – 172.16.13.158172.16.13.158
32172.16.13.159/32172.16.13.159 – 172.16.13.159172.16.13.159
33172.16.13.160/32172.16.13.160 – 172.16.13.160172.16.13.160
34172.16.13.161/32172.16.13.161 – 172.16.13.161172.16.13.161
35172.16.13.162/32172.16.13.162 – 172.16.13.162172.16.13.162
36172.16.13.163/32172.16.13.163 – 172.16.13.163172.16.13.163
37172.16.13.164/32172.16.13.164 – 172.16.13.164172.16.13.164
38172.16.13.165/32172.16.13.165 – 172.16.13.165172.16.13.165
39172.16.13.166/32172.16.13.166 – 172.16.13.166172.16.13.166
40172.16.13.167/32172.16.13.167 – 172.16.13.167172.16.13.167
41172.16.13.168/32172.16.13.168 – 172.16.13.168172.16.13.168
42172.16.13.169/32172.16.13.169 – 172.16.13.169172.16.13.169
43172.16.13.170/32172.16.13.170 – 172.16.13.170172.16.13.170
44172.16.13.171/32172.16.13.171 – 172.16.13.171172.16.13.171
45172.16.13.172/32172.16.13.172 – 172.16.13.172172.16.13.172
46172.16.13.173/32172.16.13.173 – 172.16.13.173172.16.13.173
47172.16.13.174/32172.16.13.174 – 172.16.13.174172.16.13.174
48172.16.13.175/32172.16.13.175 – 172.16.13.175172.16.13.175
49172.16.13.176/32172.16.13.176 – 172.16.13.176172.16.13.176
50172.16.13.177/32172.16.13.177 – 172.16.13.177172.16.13.177
51172.16.13.178/32172.16.13.178 – 172.16.13.178172.16.13.178
52172.16.13.179/32172.16.13.179 – 172.16.13.179172.16.13.179
53172.16.13.180/32172.16.13.180 – 172.16.13.180172.16.13.180
54172.16.13.181/32172.16.13.181 – 172.16.13.181172.16.13.181
55172.16.13.182/32172.16.13.182 – 172.16.13.182172.16.13.182
56172.16.13.183/32172.16.13.183 – 172.16.13.183172.16.13.183
57172.16.13.184/32172.16.13.184 – 172.16.13.184172.16.13.184
58172.16.13.185/32172.16.13.185 – 172.16.13.185172.16.13.185
59172.16.13.186/32172.16.13.186 – 172.16.13.186172.16.13.186
60172.16.13.187/32172.16.13.187 – 172.16.13.187172.16.13.187
61172.16.13.188/32172.16.13.188 – 172.16.13.188172.16.13.188
62172.16.13.189/32172.16.13.189 – 172.16.13.189172.16.13.189
63172.16.13.190/32172.16.13.190 – 172.16.13.190172.16.13.190
64172.16.13.191/32172.16.13.191 – 172.16.13.191172.16.13.191
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /26
/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-
/24255.255.255.0256254-
/25255.255.255.128128126-
/26255.255.255.19264621
/27255.255.255.22432302 split →
/28255.255.255.24016144 split →
/29255.255.255.248868 split →
/30255.255.255.2524216 split →
/31255.255.255.2542232 split →
/32255.255.255.2551164 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 →