ip
ipku.in

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)172.16.7.128/25
network172.16.7.128/25
broadcast172.16.7.255
first host172.16.7.129
last host172.16.7.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classB
ipcalc 172.16.7.128/25
address10101100.00010000.00000111.10000000
subnet mask11111111.11111111.11111111.10000000
network10101100.00010000.00000111.10000000
broadcast10101100.00010000.00000111.11111111
green = network part, grey = host part
hex0xac100780
decimal2886731648
reverse dns128.7.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:780

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
1172.16.7.128/32172.16.7.128 – 172.16.7.128172.16.7.128
2172.16.7.129/32172.16.7.129 – 172.16.7.129172.16.7.129
3172.16.7.130/32172.16.7.130 – 172.16.7.130172.16.7.130
4172.16.7.131/32172.16.7.131 – 172.16.7.131172.16.7.131
5172.16.7.132/32172.16.7.132 – 172.16.7.132172.16.7.132
6172.16.7.133/32172.16.7.133 – 172.16.7.133172.16.7.133
7172.16.7.134/32172.16.7.134 – 172.16.7.134172.16.7.134
8172.16.7.135/32172.16.7.135 – 172.16.7.135172.16.7.135
9172.16.7.136/32172.16.7.136 – 172.16.7.136172.16.7.136
10172.16.7.137/32172.16.7.137 – 172.16.7.137172.16.7.137
11172.16.7.138/32172.16.7.138 – 172.16.7.138172.16.7.138
12172.16.7.139/32172.16.7.139 – 172.16.7.139172.16.7.139
13172.16.7.140/32172.16.7.140 – 172.16.7.140172.16.7.140
14172.16.7.141/32172.16.7.141 – 172.16.7.141172.16.7.141
15172.16.7.142/32172.16.7.142 – 172.16.7.142172.16.7.142
16172.16.7.143/32172.16.7.143 – 172.16.7.143172.16.7.143
17172.16.7.144/32172.16.7.144 – 172.16.7.144172.16.7.144
18172.16.7.145/32172.16.7.145 – 172.16.7.145172.16.7.145
19172.16.7.146/32172.16.7.146 – 172.16.7.146172.16.7.146
20172.16.7.147/32172.16.7.147 – 172.16.7.147172.16.7.147
21172.16.7.148/32172.16.7.148 – 172.16.7.148172.16.7.148
22172.16.7.149/32172.16.7.149 – 172.16.7.149172.16.7.149
23172.16.7.150/32172.16.7.150 – 172.16.7.150172.16.7.150
24172.16.7.151/32172.16.7.151 – 172.16.7.151172.16.7.151
25172.16.7.152/32172.16.7.152 – 172.16.7.152172.16.7.152
26172.16.7.153/32172.16.7.153 – 172.16.7.153172.16.7.153
27172.16.7.154/32172.16.7.154 – 172.16.7.154172.16.7.154
28172.16.7.155/32172.16.7.155 – 172.16.7.155172.16.7.155
29172.16.7.156/32172.16.7.156 – 172.16.7.156172.16.7.156
30172.16.7.157/32172.16.7.157 – 172.16.7.157172.16.7.157
31172.16.7.158/32172.16.7.158 – 172.16.7.158172.16.7.158
32172.16.7.159/32172.16.7.159 – 172.16.7.159172.16.7.159
33172.16.7.160/32172.16.7.160 – 172.16.7.160172.16.7.160
34172.16.7.161/32172.16.7.161 – 172.16.7.161172.16.7.161
35172.16.7.162/32172.16.7.162 – 172.16.7.162172.16.7.162
36172.16.7.163/32172.16.7.163 – 172.16.7.163172.16.7.163
37172.16.7.164/32172.16.7.164 – 172.16.7.164172.16.7.164
38172.16.7.165/32172.16.7.165 – 172.16.7.165172.16.7.165
39172.16.7.166/32172.16.7.166 – 172.16.7.166172.16.7.166
40172.16.7.167/32172.16.7.167 – 172.16.7.167172.16.7.167
41172.16.7.168/32172.16.7.168 – 172.16.7.168172.16.7.168
42172.16.7.169/32172.16.7.169 – 172.16.7.169172.16.7.169
43172.16.7.170/32172.16.7.170 – 172.16.7.170172.16.7.170
44172.16.7.171/32172.16.7.171 – 172.16.7.171172.16.7.171
45172.16.7.172/32172.16.7.172 – 172.16.7.172172.16.7.172
46172.16.7.173/32172.16.7.173 – 172.16.7.173172.16.7.173
47172.16.7.174/32172.16.7.174 – 172.16.7.174172.16.7.174
48172.16.7.175/32172.16.7.175 – 172.16.7.175172.16.7.175
49172.16.7.176/32172.16.7.176 – 172.16.7.176172.16.7.176
50172.16.7.177/32172.16.7.177 – 172.16.7.177172.16.7.177
51172.16.7.178/32172.16.7.178 – 172.16.7.178172.16.7.178
52172.16.7.179/32172.16.7.179 – 172.16.7.179172.16.7.179
53172.16.7.180/32172.16.7.180 – 172.16.7.180172.16.7.180
54172.16.7.181/32172.16.7.181 – 172.16.7.181172.16.7.181
55172.16.7.182/32172.16.7.182 – 172.16.7.182172.16.7.182
56172.16.7.183/32172.16.7.183 – 172.16.7.183172.16.7.183
57172.16.7.184/32172.16.7.184 – 172.16.7.184172.16.7.184
58172.16.7.185/32172.16.7.185 – 172.16.7.185172.16.7.185
59172.16.7.186/32172.16.7.186 – 172.16.7.186172.16.7.186
60172.16.7.187/32172.16.7.187 – 172.16.7.187172.16.7.187
61172.16.7.188/32172.16.7.188 – 172.16.7.188172.16.7.188
62172.16.7.189/32172.16.7.189 – 172.16.7.189172.16.7.189
63172.16.7.190/32172.16.7.190 – 172.16.7.190172.16.7.190
64172.16.7.191/32172.16.7.191 – 172.16.7.191172.16.7.191
65172.16.7.192/32172.16.7.192 – 172.16.7.192172.16.7.192
66172.16.7.193/32172.16.7.193 – 172.16.7.193172.16.7.193
67172.16.7.194/32172.16.7.194 – 172.16.7.194172.16.7.194
68172.16.7.195/32172.16.7.195 – 172.16.7.195172.16.7.195
69172.16.7.196/32172.16.7.196 – 172.16.7.196172.16.7.196
70172.16.7.197/32172.16.7.197 – 172.16.7.197172.16.7.197
71172.16.7.198/32172.16.7.198 – 172.16.7.198172.16.7.198
72172.16.7.199/32172.16.7.199 – 172.16.7.199172.16.7.199
73172.16.7.200/32172.16.7.200 – 172.16.7.200172.16.7.200
74172.16.7.201/32172.16.7.201 – 172.16.7.201172.16.7.201
75172.16.7.202/32172.16.7.202 – 172.16.7.202172.16.7.202
76172.16.7.203/32172.16.7.203 – 172.16.7.203172.16.7.203
77172.16.7.204/32172.16.7.204 – 172.16.7.204172.16.7.204
78172.16.7.205/32172.16.7.205 – 172.16.7.205172.16.7.205
79172.16.7.206/32172.16.7.206 – 172.16.7.206172.16.7.206
80172.16.7.207/32172.16.7.207 – 172.16.7.207172.16.7.207
81172.16.7.208/32172.16.7.208 – 172.16.7.208172.16.7.208
82172.16.7.209/32172.16.7.209 – 172.16.7.209172.16.7.209
83172.16.7.210/32172.16.7.210 – 172.16.7.210172.16.7.210
84172.16.7.211/32172.16.7.211 – 172.16.7.211172.16.7.211
85172.16.7.212/32172.16.7.212 – 172.16.7.212172.16.7.212
86172.16.7.213/32172.16.7.213 – 172.16.7.213172.16.7.213
87172.16.7.214/32172.16.7.214 – 172.16.7.214172.16.7.214
88172.16.7.215/32172.16.7.215 – 172.16.7.215172.16.7.215
89172.16.7.216/32172.16.7.216 – 172.16.7.216172.16.7.216
90172.16.7.217/32172.16.7.217 – 172.16.7.217172.16.7.217
91172.16.7.218/32172.16.7.218 – 172.16.7.218172.16.7.218
92172.16.7.219/32172.16.7.219 – 172.16.7.219172.16.7.219
93172.16.7.220/32172.16.7.220 – 172.16.7.220172.16.7.220
94172.16.7.221/32172.16.7.221 – 172.16.7.221172.16.7.221
95172.16.7.222/32172.16.7.222 – 172.16.7.222172.16.7.222
96172.16.7.223/32172.16.7.223 – 172.16.7.223172.16.7.223
97172.16.7.224/32172.16.7.224 – 172.16.7.224172.16.7.224
98172.16.7.225/32172.16.7.225 – 172.16.7.225172.16.7.225
99172.16.7.226/32172.16.7.226 – 172.16.7.226172.16.7.226
100172.16.7.227/32172.16.7.227 – 172.16.7.227172.16.7.227
101172.16.7.228/32172.16.7.228 – 172.16.7.228172.16.7.228
102172.16.7.229/32172.16.7.229 – 172.16.7.229172.16.7.229
103172.16.7.230/32172.16.7.230 – 172.16.7.230172.16.7.230
104172.16.7.231/32172.16.7.231 – 172.16.7.231172.16.7.231
105172.16.7.232/32172.16.7.232 – 172.16.7.232172.16.7.232
106172.16.7.233/32172.16.7.233 – 172.16.7.233172.16.7.233
107172.16.7.234/32172.16.7.234 – 172.16.7.234172.16.7.234
108172.16.7.235/32172.16.7.235 – 172.16.7.235172.16.7.235
109172.16.7.236/32172.16.7.236 – 172.16.7.236172.16.7.236
110172.16.7.237/32172.16.7.237 – 172.16.7.237172.16.7.237
111172.16.7.238/32172.16.7.238 – 172.16.7.238172.16.7.238
112172.16.7.239/32172.16.7.239 – 172.16.7.239172.16.7.239
113172.16.7.240/32172.16.7.240 – 172.16.7.240172.16.7.240
114172.16.7.241/32172.16.7.241 – 172.16.7.241172.16.7.241
115172.16.7.242/32172.16.7.242 – 172.16.7.242172.16.7.242
116172.16.7.243/32172.16.7.243 – 172.16.7.243172.16.7.243
117172.16.7.244/32172.16.7.244 – 172.16.7.244172.16.7.244
118172.16.7.245/32172.16.7.245 – 172.16.7.245172.16.7.245
119172.16.7.246/32172.16.7.246 – 172.16.7.246172.16.7.246
120172.16.7.247/32172.16.7.247 – 172.16.7.247172.16.7.247
121172.16.7.248/32172.16.7.248 – 172.16.7.248172.16.7.248
122172.16.7.249/32172.16.7.249 – 172.16.7.249172.16.7.249
123172.16.7.250/32172.16.7.250 – 172.16.7.250172.16.7.250
124172.16.7.251/32172.16.7.251 – 172.16.7.251172.16.7.251
125172.16.7.252/32172.16.7.252 – 172.16.7.252172.16.7.252
126172.16.7.253/32172.16.7.253 – 172.16.7.253172.16.7.253
127172.16.7.254/32172.16.7.254 – 172.16.7.254172.16.7.254
128172.16.7.255/32172.16.7.255 – 172.16.7.255172.16.7.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /25
/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-
/25255.255.255.1281281261
/26255.255.255.19264622 split →
/27255.255.255.22432304 split →
/28255.255.255.24016148 split →
/29255.255.255.2488616 split →
/30255.255.255.2524232 split →
/31255.255.255.2542264 split →
/32255.255.255.25511128 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 →