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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)172.16.4.128/26
network172.16.4.128/26
broadcast172.16.4.191
first host172.16.4.129
last host172.16.4.190
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classB
ipcalc 172.16.4.128/26
address10101100.00010000.00000100.10000000
subnet mask11111111.11111111.11111111.11000000
network10101100.00010000.00000100.10000000
broadcast10101100.00010000.00000100.10111111
green = network part, grey = host part
hex0xac100480
decimal2886730880
reverse dns128.4.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:480

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
1172.16.4.128/32172.16.4.128 – 172.16.4.128172.16.4.128
2172.16.4.129/32172.16.4.129 – 172.16.4.129172.16.4.129
3172.16.4.130/32172.16.4.130 – 172.16.4.130172.16.4.130
4172.16.4.131/32172.16.4.131 – 172.16.4.131172.16.4.131
5172.16.4.132/32172.16.4.132 – 172.16.4.132172.16.4.132
6172.16.4.133/32172.16.4.133 – 172.16.4.133172.16.4.133
7172.16.4.134/32172.16.4.134 – 172.16.4.134172.16.4.134
8172.16.4.135/32172.16.4.135 – 172.16.4.135172.16.4.135
9172.16.4.136/32172.16.4.136 – 172.16.4.136172.16.4.136
10172.16.4.137/32172.16.4.137 – 172.16.4.137172.16.4.137
11172.16.4.138/32172.16.4.138 – 172.16.4.138172.16.4.138
12172.16.4.139/32172.16.4.139 – 172.16.4.139172.16.4.139
13172.16.4.140/32172.16.4.140 – 172.16.4.140172.16.4.140
14172.16.4.141/32172.16.4.141 – 172.16.4.141172.16.4.141
15172.16.4.142/32172.16.4.142 – 172.16.4.142172.16.4.142
16172.16.4.143/32172.16.4.143 – 172.16.4.143172.16.4.143
17172.16.4.144/32172.16.4.144 – 172.16.4.144172.16.4.144
18172.16.4.145/32172.16.4.145 – 172.16.4.145172.16.4.145
19172.16.4.146/32172.16.4.146 – 172.16.4.146172.16.4.146
20172.16.4.147/32172.16.4.147 – 172.16.4.147172.16.4.147
21172.16.4.148/32172.16.4.148 – 172.16.4.148172.16.4.148
22172.16.4.149/32172.16.4.149 – 172.16.4.149172.16.4.149
23172.16.4.150/32172.16.4.150 – 172.16.4.150172.16.4.150
24172.16.4.151/32172.16.4.151 – 172.16.4.151172.16.4.151
25172.16.4.152/32172.16.4.152 – 172.16.4.152172.16.4.152
26172.16.4.153/32172.16.4.153 – 172.16.4.153172.16.4.153
27172.16.4.154/32172.16.4.154 – 172.16.4.154172.16.4.154
28172.16.4.155/32172.16.4.155 – 172.16.4.155172.16.4.155
29172.16.4.156/32172.16.4.156 – 172.16.4.156172.16.4.156
30172.16.4.157/32172.16.4.157 – 172.16.4.157172.16.4.157
31172.16.4.158/32172.16.4.158 – 172.16.4.158172.16.4.158
32172.16.4.159/32172.16.4.159 – 172.16.4.159172.16.4.159
33172.16.4.160/32172.16.4.160 – 172.16.4.160172.16.4.160
34172.16.4.161/32172.16.4.161 – 172.16.4.161172.16.4.161
35172.16.4.162/32172.16.4.162 – 172.16.4.162172.16.4.162
36172.16.4.163/32172.16.4.163 – 172.16.4.163172.16.4.163
37172.16.4.164/32172.16.4.164 – 172.16.4.164172.16.4.164
38172.16.4.165/32172.16.4.165 – 172.16.4.165172.16.4.165
39172.16.4.166/32172.16.4.166 – 172.16.4.166172.16.4.166
40172.16.4.167/32172.16.4.167 – 172.16.4.167172.16.4.167
41172.16.4.168/32172.16.4.168 – 172.16.4.168172.16.4.168
42172.16.4.169/32172.16.4.169 – 172.16.4.169172.16.4.169
43172.16.4.170/32172.16.4.170 – 172.16.4.170172.16.4.170
44172.16.4.171/32172.16.4.171 – 172.16.4.171172.16.4.171
45172.16.4.172/32172.16.4.172 – 172.16.4.172172.16.4.172
46172.16.4.173/32172.16.4.173 – 172.16.4.173172.16.4.173
47172.16.4.174/32172.16.4.174 – 172.16.4.174172.16.4.174
48172.16.4.175/32172.16.4.175 – 172.16.4.175172.16.4.175
49172.16.4.176/32172.16.4.176 – 172.16.4.176172.16.4.176
50172.16.4.177/32172.16.4.177 – 172.16.4.177172.16.4.177
51172.16.4.178/32172.16.4.178 – 172.16.4.178172.16.4.178
52172.16.4.179/32172.16.4.179 – 172.16.4.179172.16.4.179
53172.16.4.180/32172.16.4.180 – 172.16.4.180172.16.4.180
54172.16.4.181/32172.16.4.181 – 172.16.4.181172.16.4.181
55172.16.4.182/32172.16.4.182 – 172.16.4.182172.16.4.182
56172.16.4.183/32172.16.4.183 – 172.16.4.183172.16.4.183
57172.16.4.184/32172.16.4.184 – 172.16.4.184172.16.4.184
58172.16.4.185/32172.16.4.185 – 172.16.4.185172.16.4.185
59172.16.4.186/32172.16.4.186 – 172.16.4.186172.16.4.186
60172.16.4.187/32172.16.4.187 – 172.16.4.187172.16.4.187
61172.16.4.188/32172.16.4.188 – 172.16.4.188172.16.4.188
62172.16.4.189/32172.16.4.189 – 172.16.4.189172.16.4.189
63172.16.4.190/32172.16.4.190 – 172.16.4.190172.16.4.190
64172.16.4.191/32172.16.4.191 – 172.16.4.191172.16.4.191
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 →