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)10.3.71.128/25
network10.3.71.128/25
broadcast10.3.71.255
first host10.3.71.129
last host10.3.71.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.3.71.128/25
address00001010.00000011.01000111.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000011.01000111.10000000
broadcast00001010.00000011.01000111.11111111
green = network part, grey = host part
hex0x0a034780
decimal167987072
reverse dns128.71.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:4780

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.3.71.128/3210.3.71.128 – 10.3.71.12810.3.71.128
210.3.71.129/3210.3.71.129 – 10.3.71.12910.3.71.129
310.3.71.130/3210.3.71.130 – 10.3.71.13010.3.71.130
410.3.71.131/3210.3.71.131 – 10.3.71.13110.3.71.131
510.3.71.132/3210.3.71.132 – 10.3.71.13210.3.71.132
610.3.71.133/3210.3.71.133 – 10.3.71.13310.3.71.133
710.3.71.134/3210.3.71.134 – 10.3.71.13410.3.71.134
810.3.71.135/3210.3.71.135 – 10.3.71.13510.3.71.135
910.3.71.136/3210.3.71.136 – 10.3.71.13610.3.71.136
1010.3.71.137/3210.3.71.137 – 10.3.71.13710.3.71.137
1110.3.71.138/3210.3.71.138 – 10.3.71.13810.3.71.138
1210.3.71.139/3210.3.71.139 – 10.3.71.13910.3.71.139
1310.3.71.140/3210.3.71.140 – 10.3.71.14010.3.71.140
1410.3.71.141/3210.3.71.141 – 10.3.71.14110.3.71.141
1510.3.71.142/3210.3.71.142 – 10.3.71.14210.3.71.142
1610.3.71.143/3210.3.71.143 – 10.3.71.14310.3.71.143
1710.3.71.144/3210.3.71.144 – 10.3.71.14410.3.71.144
1810.3.71.145/3210.3.71.145 – 10.3.71.14510.3.71.145
1910.3.71.146/3210.3.71.146 – 10.3.71.14610.3.71.146
2010.3.71.147/3210.3.71.147 – 10.3.71.14710.3.71.147
2110.3.71.148/3210.3.71.148 – 10.3.71.14810.3.71.148
2210.3.71.149/3210.3.71.149 – 10.3.71.14910.3.71.149
2310.3.71.150/3210.3.71.150 – 10.3.71.15010.3.71.150
2410.3.71.151/3210.3.71.151 – 10.3.71.15110.3.71.151
2510.3.71.152/3210.3.71.152 – 10.3.71.15210.3.71.152
2610.3.71.153/3210.3.71.153 – 10.3.71.15310.3.71.153
2710.3.71.154/3210.3.71.154 – 10.3.71.15410.3.71.154
2810.3.71.155/3210.3.71.155 – 10.3.71.15510.3.71.155
2910.3.71.156/3210.3.71.156 – 10.3.71.15610.3.71.156
3010.3.71.157/3210.3.71.157 – 10.3.71.15710.3.71.157
3110.3.71.158/3210.3.71.158 – 10.3.71.15810.3.71.158
3210.3.71.159/3210.3.71.159 – 10.3.71.15910.3.71.159
3310.3.71.160/3210.3.71.160 – 10.3.71.16010.3.71.160
3410.3.71.161/3210.3.71.161 – 10.3.71.16110.3.71.161
3510.3.71.162/3210.3.71.162 – 10.3.71.16210.3.71.162
3610.3.71.163/3210.3.71.163 – 10.3.71.16310.3.71.163
3710.3.71.164/3210.3.71.164 – 10.3.71.16410.3.71.164
3810.3.71.165/3210.3.71.165 – 10.3.71.16510.3.71.165
3910.3.71.166/3210.3.71.166 – 10.3.71.16610.3.71.166
4010.3.71.167/3210.3.71.167 – 10.3.71.16710.3.71.167
4110.3.71.168/3210.3.71.168 – 10.3.71.16810.3.71.168
4210.3.71.169/3210.3.71.169 – 10.3.71.16910.3.71.169
4310.3.71.170/3210.3.71.170 – 10.3.71.17010.3.71.170
4410.3.71.171/3210.3.71.171 – 10.3.71.17110.3.71.171
4510.3.71.172/3210.3.71.172 – 10.3.71.17210.3.71.172
4610.3.71.173/3210.3.71.173 – 10.3.71.17310.3.71.173
4710.3.71.174/3210.3.71.174 – 10.3.71.17410.3.71.174
4810.3.71.175/3210.3.71.175 – 10.3.71.17510.3.71.175
4910.3.71.176/3210.3.71.176 – 10.3.71.17610.3.71.176
5010.3.71.177/3210.3.71.177 – 10.3.71.17710.3.71.177
5110.3.71.178/3210.3.71.178 – 10.3.71.17810.3.71.178
5210.3.71.179/3210.3.71.179 – 10.3.71.17910.3.71.179
5310.3.71.180/3210.3.71.180 – 10.3.71.18010.3.71.180
5410.3.71.181/3210.3.71.181 – 10.3.71.18110.3.71.181
5510.3.71.182/3210.3.71.182 – 10.3.71.18210.3.71.182
5610.3.71.183/3210.3.71.183 – 10.3.71.18310.3.71.183
5710.3.71.184/3210.3.71.184 – 10.3.71.18410.3.71.184
5810.3.71.185/3210.3.71.185 – 10.3.71.18510.3.71.185
5910.3.71.186/3210.3.71.186 – 10.3.71.18610.3.71.186
6010.3.71.187/3210.3.71.187 – 10.3.71.18710.3.71.187
6110.3.71.188/3210.3.71.188 – 10.3.71.18810.3.71.188
6210.3.71.189/3210.3.71.189 – 10.3.71.18910.3.71.189
6310.3.71.190/3210.3.71.190 – 10.3.71.19010.3.71.190
6410.3.71.191/3210.3.71.191 – 10.3.71.19110.3.71.191
6510.3.71.192/3210.3.71.192 – 10.3.71.19210.3.71.192
6610.3.71.193/3210.3.71.193 – 10.3.71.19310.3.71.193
6710.3.71.194/3210.3.71.194 – 10.3.71.19410.3.71.194
6810.3.71.195/3210.3.71.195 – 10.3.71.19510.3.71.195
6910.3.71.196/3210.3.71.196 – 10.3.71.19610.3.71.196
7010.3.71.197/3210.3.71.197 – 10.3.71.19710.3.71.197
7110.3.71.198/3210.3.71.198 – 10.3.71.19810.3.71.198
7210.3.71.199/3210.3.71.199 – 10.3.71.19910.3.71.199
7310.3.71.200/3210.3.71.200 – 10.3.71.20010.3.71.200
7410.3.71.201/3210.3.71.201 – 10.3.71.20110.3.71.201
7510.3.71.202/3210.3.71.202 – 10.3.71.20210.3.71.202
7610.3.71.203/3210.3.71.203 – 10.3.71.20310.3.71.203
7710.3.71.204/3210.3.71.204 – 10.3.71.20410.3.71.204
7810.3.71.205/3210.3.71.205 – 10.3.71.20510.3.71.205
7910.3.71.206/3210.3.71.206 – 10.3.71.20610.3.71.206
8010.3.71.207/3210.3.71.207 – 10.3.71.20710.3.71.207
8110.3.71.208/3210.3.71.208 – 10.3.71.20810.3.71.208
8210.3.71.209/3210.3.71.209 – 10.3.71.20910.3.71.209
8310.3.71.210/3210.3.71.210 – 10.3.71.21010.3.71.210
8410.3.71.211/3210.3.71.211 – 10.3.71.21110.3.71.211
8510.3.71.212/3210.3.71.212 – 10.3.71.21210.3.71.212
8610.3.71.213/3210.3.71.213 – 10.3.71.21310.3.71.213
8710.3.71.214/3210.3.71.214 – 10.3.71.21410.3.71.214
8810.3.71.215/3210.3.71.215 – 10.3.71.21510.3.71.215
8910.3.71.216/3210.3.71.216 – 10.3.71.21610.3.71.216
9010.3.71.217/3210.3.71.217 – 10.3.71.21710.3.71.217
9110.3.71.218/3210.3.71.218 – 10.3.71.21810.3.71.218
9210.3.71.219/3210.3.71.219 – 10.3.71.21910.3.71.219
9310.3.71.220/3210.3.71.220 – 10.3.71.22010.3.71.220
9410.3.71.221/3210.3.71.221 – 10.3.71.22110.3.71.221
9510.3.71.222/3210.3.71.222 – 10.3.71.22210.3.71.222
9610.3.71.223/3210.3.71.223 – 10.3.71.22310.3.71.223
9710.3.71.224/3210.3.71.224 – 10.3.71.22410.3.71.224
9810.3.71.225/3210.3.71.225 – 10.3.71.22510.3.71.225
9910.3.71.226/3210.3.71.226 – 10.3.71.22610.3.71.226
10010.3.71.227/3210.3.71.227 – 10.3.71.22710.3.71.227
10110.3.71.228/3210.3.71.228 – 10.3.71.22810.3.71.228
10210.3.71.229/3210.3.71.229 – 10.3.71.22910.3.71.229
10310.3.71.230/3210.3.71.230 – 10.3.71.23010.3.71.230
10410.3.71.231/3210.3.71.231 – 10.3.71.23110.3.71.231
10510.3.71.232/3210.3.71.232 – 10.3.71.23210.3.71.232
10610.3.71.233/3210.3.71.233 – 10.3.71.23310.3.71.233
10710.3.71.234/3210.3.71.234 – 10.3.71.23410.3.71.234
10810.3.71.235/3210.3.71.235 – 10.3.71.23510.3.71.235
10910.3.71.236/3210.3.71.236 – 10.3.71.23610.3.71.236
11010.3.71.237/3210.3.71.237 – 10.3.71.23710.3.71.237
11110.3.71.238/3210.3.71.238 – 10.3.71.23810.3.71.238
11210.3.71.239/3210.3.71.239 – 10.3.71.23910.3.71.239
11310.3.71.240/3210.3.71.240 – 10.3.71.24010.3.71.240
11410.3.71.241/3210.3.71.241 – 10.3.71.24110.3.71.241
11510.3.71.242/3210.3.71.242 – 10.3.71.24210.3.71.242
11610.3.71.243/3210.3.71.243 – 10.3.71.24310.3.71.243
11710.3.71.244/3210.3.71.244 – 10.3.71.24410.3.71.244
11810.3.71.245/3210.3.71.245 – 10.3.71.24510.3.71.245
11910.3.71.246/3210.3.71.246 – 10.3.71.24610.3.71.246
12010.3.71.247/3210.3.71.247 – 10.3.71.24710.3.71.247
12110.3.71.248/3210.3.71.248 – 10.3.71.24810.3.71.248
12210.3.71.249/3210.3.71.249 – 10.3.71.24910.3.71.249
12310.3.71.250/3210.3.71.250 – 10.3.71.25010.3.71.250
12410.3.71.251/3210.3.71.251 – 10.3.71.25110.3.71.251
12510.3.71.252/3210.3.71.252 – 10.3.71.25210.3.71.252
12610.3.71.253/3210.3.71.253 – 10.3.71.25310.3.71.253
12710.3.71.254/3210.3.71.254 – 10.3.71.25410.3.71.254
12810.3.71.255/3210.3.71.255 – 10.3.71.25510.3.71.255
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 →