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)10.66.167.128/25
network10.66.167.128/25
broadcast10.66.167.255
first host10.66.167.129
last host10.66.167.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.66.167.128/25
address00001010.01000010.10100111.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.01000010.10100111.10000000
broadcast00001010.01000010.10100111.11111111
green = network part, grey = host part
hex0x0a42a780
decimal172140416
reverse dns128.167.66.10.in-addr.arpa
ipv4-mapped::ffff:a42:a780

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.66.167.128/3210.66.167.128 – 10.66.167.12810.66.167.128
210.66.167.129/3210.66.167.129 – 10.66.167.12910.66.167.129
310.66.167.130/3210.66.167.130 – 10.66.167.13010.66.167.130
410.66.167.131/3210.66.167.131 – 10.66.167.13110.66.167.131
510.66.167.132/3210.66.167.132 – 10.66.167.13210.66.167.132
610.66.167.133/3210.66.167.133 – 10.66.167.13310.66.167.133
710.66.167.134/3210.66.167.134 – 10.66.167.13410.66.167.134
810.66.167.135/3210.66.167.135 – 10.66.167.13510.66.167.135
910.66.167.136/3210.66.167.136 – 10.66.167.13610.66.167.136
1010.66.167.137/3210.66.167.137 – 10.66.167.13710.66.167.137
1110.66.167.138/3210.66.167.138 – 10.66.167.13810.66.167.138
1210.66.167.139/3210.66.167.139 – 10.66.167.13910.66.167.139
1310.66.167.140/3210.66.167.140 – 10.66.167.14010.66.167.140
1410.66.167.141/3210.66.167.141 – 10.66.167.14110.66.167.141
1510.66.167.142/3210.66.167.142 – 10.66.167.14210.66.167.142
1610.66.167.143/3210.66.167.143 – 10.66.167.14310.66.167.143
1710.66.167.144/3210.66.167.144 – 10.66.167.14410.66.167.144
1810.66.167.145/3210.66.167.145 – 10.66.167.14510.66.167.145
1910.66.167.146/3210.66.167.146 – 10.66.167.14610.66.167.146
2010.66.167.147/3210.66.167.147 – 10.66.167.14710.66.167.147
2110.66.167.148/3210.66.167.148 – 10.66.167.14810.66.167.148
2210.66.167.149/3210.66.167.149 – 10.66.167.14910.66.167.149
2310.66.167.150/3210.66.167.150 – 10.66.167.15010.66.167.150
2410.66.167.151/3210.66.167.151 – 10.66.167.15110.66.167.151
2510.66.167.152/3210.66.167.152 – 10.66.167.15210.66.167.152
2610.66.167.153/3210.66.167.153 – 10.66.167.15310.66.167.153
2710.66.167.154/3210.66.167.154 – 10.66.167.15410.66.167.154
2810.66.167.155/3210.66.167.155 – 10.66.167.15510.66.167.155
2910.66.167.156/3210.66.167.156 – 10.66.167.15610.66.167.156
3010.66.167.157/3210.66.167.157 – 10.66.167.15710.66.167.157
3110.66.167.158/3210.66.167.158 – 10.66.167.15810.66.167.158
3210.66.167.159/3210.66.167.159 – 10.66.167.15910.66.167.159
3310.66.167.160/3210.66.167.160 – 10.66.167.16010.66.167.160
3410.66.167.161/3210.66.167.161 – 10.66.167.16110.66.167.161
3510.66.167.162/3210.66.167.162 – 10.66.167.16210.66.167.162
3610.66.167.163/3210.66.167.163 – 10.66.167.16310.66.167.163
3710.66.167.164/3210.66.167.164 – 10.66.167.16410.66.167.164
3810.66.167.165/3210.66.167.165 – 10.66.167.16510.66.167.165
3910.66.167.166/3210.66.167.166 – 10.66.167.16610.66.167.166
4010.66.167.167/3210.66.167.167 – 10.66.167.16710.66.167.167
4110.66.167.168/3210.66.167.168 – 10.66.167.16810.66.167.168
4210.66.167.169/3210.66.167.169 – 10.66.167.16910.66.167.169
4310.66.167.170/3210.66.167.170 – 10.66.167.17010.66.167.170
4410.66.167.171/3210.66.167.171 – 10.66.167.17110.66.167.171
4510.66.167.172/3210.66.167.172 – 10.66.167.17210.66.167.172
4610.66.167.173/3210.66.167.173 – 10.66.167.17310.66.167.173
4710.66.167.174/3210.66.167.174 – 10.66.167.17410.66.167.174
4810.66.167.175/3210.66.167.175 – 10.66.167.17510.66.167.175
4910.66.167.176/3210.66.167.176 – 10.66.167.17610.66.167.176
5010.66.167.177/3210.66.167.177 – 10.66.167.17710.66.167.177
5110.66.167.178/3210.66.167.178 – 10.66.167.17810.66.167.178
5210.66.167.179/3210.66.167.179 – 10.66.167.17910.66.167.179
5310.66.167.180/3210.66.167.180 – 10.66.167.18010.66.167.180
5410.66.167.181/3210.66.167.181 – 10.66.167.18110.66.167.181
5510.66.167.182/3210.66.167.182 – 10.66.167.18210.66.167.182
5610.66.167.183/3210.66.167.183 – 10.66.167.18310.66.167.183
5710.66.167.184/3210.66.167.184 – 10.66.167.18410.66.167.184
5810.66.167.185/3210.66.167.185 – 10.66.167.18510.66.167.185
5910.66.167.186/3210.66.167.186 – 10.66.167.18610.66.167.186
6010.66.167.187/3210.66.167.187 – 10.66.167.18710.66.167.187
6110.66.167.188/3210.66.167.188 – 10.66.167.18810.66.167.188
6210.66.167.189/3210.66.167.189 – 10.66.167.18910.66.167.189
6310.66.167.190/3210.66.167.190 – 10.66.167.19010.66.167.190
6410.66.167.191/3210.66.167.191 – 10.66.167.19110.66.167.191
6510.66.167.192/3210.66.167.192 – 10.66.167.19210.66.167.192
6610.66.167.193/3210.66.167.193 – 10.66.167.19310.66.167.193
6710.66.167.194/3210.66.167.194 – 10.66.167.19410.66.167.194
6810.66.167.195/3210.66.167.195 – 10.66.167.19510.66.167.195
6910.66.167.196/3210.66.167.196 – 10.66.167.19610.66.167.196
7010.66.167.197/3210.66.167.197 – 10.66.167.19710.66.167.197
7110.66.167.198/3210.66.167.198 – 10.66.167.19810.66.167.198
7210.66.167.199/3210.66.167.199 – 10.66.167.19910.66.167.199
7310.66.167.200/3210.66.167.200 – 10.66.167.20010.66.167.200
7410.66.167.201/3210.66.167.201 – 10.66.167.20110.66.167.201
7510.66.167.202/3210.66.167.202 – 10.66.167.20210.66.167.202
7610.66.167.203/3210.66.167.203 – 10.66.167.20310.66.167.203
7710.66.167.204/3210.66.167.204 – 10.66.167.20410.66.167.204
7810.66.167.205/3210.66.167.205 – 10.66.167.20510.66.167.205
7910.66.167.206/3210.66.167.206 – 10.66.167.20610.66.167.206
8010.66.167.207/3210.66.167.207 – 10.66.167.20710.66.167.207
8110.66.167.208/3210.66.167.208 – 10.66.167.20810.66.167.208
8210.66.167.209/3210.66.167.209 – 10.66.167.20910.66.167.209
8310.66.167.210/3210.66.167.210 – 10.66.167.21010.66.167.210
8410.66.167.211/3210.66.167.211 – 10.66.167.21110.66.167.211
8510.66.167.212/3210.66.167.212 – 10.66.167.21210.66.167.212
8610.66.167.213/3210.66.167.213 – 10.66.167.21310.66.167.213
8710.66.167.214/3210.66.167.214 – 10.66.167.21410.66.167.214
8810.66.167.215/3210.66.167.215 – 10.66.167.21510.66.167.215
8910.66.167.216/3210.66.167.216 – 10.66.167.21610.66.167.216
9010.66.167.217/3210.66.167.217 – 10.66.167.21710.66.167.217
9110.66.167.218/3210.66.167.218 – 10.66.167.21810.66.167.218
9210.66.167.219/3210.66.167.219 – 10.66.167.21910.66.167.219
9310.66.167.220/3210.66.167.220 – 10.66.167.22010.66.167.220
9410.66.167.221/3210.66.167.221 – 10.66.167.22110.66.167.221
9510.66.167.222/3210.66.167.222 – 10.66.167.22210.66.167.222
9610.66.167.223/3210.66.167.223 – 10.66.167.22310.66.167.223
9710.66.167.224/3210.66.167.224 – 10.66.167.22410.66.167.224
9810.66.167.225/3210.66.167.225 – 10.66.167.22510.66.167.225
9910.66.167.226/3210.66.167.226 – 10.66.167.22610.66.167.226
10010.66.167.227/3210.66.167.227 – 10.66.167.22710.66.167.227
10110.66.167.228/3210.66.167.228 – 10.66.167.22810.66.167.228
10210.66.167.229/3210.66.167.229 – 10.66.167.22910.66.167.229
10310.66.167.230/3210.66.167.230 – 10.66.167.23010.66.167.230
10410.66.167.231/3210.66.167.231 – 10.66.167.23110.66.167.231
10510.66.167.232/3210.66.167.232 – 10.66.167.23210.66.167.232
10610.66.167.233/3210.66.167.233 – 10.66.167.23310.66.167.233
10710.66.167.234/3210.66.167.234 – 10.66.167.23410.66.167.234
10810.66.167.235/3210.66.167.235 – 10.66.167.23510.66.167.235
10910.66.167.236/3210.66.167.236 – 10.66.167.23610.66.167.236
11010.66.167.237/3210.66.167.237 – 10.66.167.23710.66.167.237
11110.66.167.238/3210.66.167.238 – 10.66.167.23810.66.167.238
11210.66.167.239/3210.66.167.239 – 10.66.167.23910.66.167.239
11310.66.167.240/3210.66.167.240 – 10.66.167.24010.66.167.240
11410.66.167.241/3210.66.167.241 – 10.66.167.24110.66.167.241
11510.66.167.242/3210.66.167.242 – 10.66.167.24210.66.167.242
11610.66.167.243/3210.66.167.243 – 10.66.167.24310.66.167.243
11710.66.167.244/3210.66.167.244 – 10.66.167.24410.66.167.244
11810.66.167.245/3210.66.167.245 – 10.66.167.24510.66.167.245
11910.66.167.246/3210.66.167.246 – 10.66.167.24610.66.167.246
12010.66.167.247/3210.66.167.247 – 10.66.167.24710.66.167.247
12110.66.167.248/3210.66.167.248 – 10.66.167.24810.66.167.248
12210.66.167.249/3210.66.167.249 – 10.66.167.24910.66.167.249
12310.66.167.250/3210.66.167.250 – 10.66.167.25010.66.167.250
12410.66.167.251/3210.66.167.251 – 10.66.167.25110.66.167.251
12510.66.167.252/3210.66.167.252 – 10.66.167.25210.66.167.252
12610.66.167.253/3210.66.167.253 – 10.66.167.25310.66.167.253
12710.66.167.254/3210.66.167.254 – 10.66.167.25410.66.167.254
12810.66.167.255/3210.66.167.255 – 10.66.167.25510.66.167.255
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 →