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)10.2.91.128/25
network10.2.91.128/25
broadcast10.2.91.255
first host10.2.91.129
last host10.2.91.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.91.128/25
address00001010.00000010.01011011.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.01011011.10000000
broadcast00001010.00000010.01011011.11111111
green = network part, grey = host part
hex0x0a025b80
decimal167926656
reverse dns128.91.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:5b80

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.2.91.128/3210.2.91.128 – 10.2.91.12810.2.91.128
210.2.91.129/3210.2.91.129 – 10.2.91.12910.2.91.129
310.2.91.130/3210.2.91.130 – 10.2.91.13010.2.91.130
410.2.91.131/3210.2.91.131 – 10.2.91.13110.2.91.131
510.2.91.132/3210.2.91.132 – 10.2.91.13210.2.91.132
610.2.91.133/3210.2.91.133 – 10.2.91.13310.2.91.133
710.2.91.134/3210.2.91.134 – 10.2.91.13410.2.91.134
810.2.91.135/3210.2.91.135 – 10.2.91.13510.2.91.135
910.2.91.136/3210.2.91.136 – 10.2.91.13610.2.91.136
1010.2.91.137/3210.2.91.137 – 10.2.91.13710.2.91.137
1110.2.91.138/3210.2.91.138 – 10.2.91.13810.2.91.138
1210.2.91.139/3210.2.91.139 – 10.2.91.13910.2.91.139
1310.2.91.140/3210.2.91.140 – 10.2.91.14010.2.91.140
1410.2.91.141/3210.2.91.141 – 10.2.91.14110.2.91.141
1510.2.91.142/3210.2.91.142 – 10.2.91.14210.2.91.142
1610.2.91.143/3210.2.91.143 – 10.2.91.14310.2.91.143
1710.2.91.144/3210.2.91.144 – 10.2.91.14410.2.91.144
1810.2.91.145/3210.2.91.145 – 10.2.91.14510.2.91.145
1910.2.91.146/3210.2.91.146 – 10.2.91.14610.2.91.146
2010.2.91.147/3210.2.91.147 – 10.2.91.14710.2.91.147
2110.2.91.148/3210.2.91.148 – 10.2.91.14810.2.91.148
2210.2.91.149/3210.2.91.149 – 10.2.91.14910.2.91.149
2310.2.91.150/3210.2.91.150 – 10.2.91.15010.2.91.150
2410.2.91.151/3210.2.91.151 – 10.2.91.15110.2.91.151
2510.2.91.152/3210.2.91.152 – 10.2.91.15210.2.91.152
2610.2.91.153/3210.2.91.153 – 10.2.91.15310.2.91.153
2710.2.91.154/3210.2.91.154 – 10.2.91.15410.2.91.154
2810.2.91.155/3210.2.91.155 – 10.2.91.15510.2.91.155
2910.2.91.156/3210.2.91.156 – 10.2.91.15610.2.91.156
3010.2.91.157/3210.2.91.157 – 10.2.91.15710.2.91.157
3110.2.91.158/3210.2.91.158 – 10.2.91.15810.2.91.158
3210.2.91.159/3210.2.91.159 – 10.2.91.15910.2.91.159
3310.2.91.160/3210.2.91.160 – 10.2.91.16010.2.91.160
3410.2.91.161/3210.2.91.161 – 10.2.91.16110.2.91.161
3510.2.91.162/3210.2.91.162 – 10.2.91.16210.2.91.162
3610.2.91.163/3210.2.91.163 – 10.2.91.16310.2.91.163
3710.2.91.164/3210.2.91.164 – 10.2.91.16410.2.91.164
3810.2.91.165/3210.2.91.165 – 10.2.91.16510.2.91.165
3910.2.91.166/3210.2.91.166 – 10.2.91.16610.2.91.166
4010.2.91.167/3210.2.91.167 – 10.2.91.16710.2.91.167
4110.2.91.168/3210.2.91.168 – 10.2.91.16810.2.91.168
4210.2.91.169/3210.2.91.169 – 10.2.91.16910.2.91.169
4310.2.91.170/3210.2.91.170 – 10.2.91.17010.2.91.170
4410.2.91.171/3210.2.91.171 – 10.2.91.17110.2.91.171
4510.2.91.172/3210.2.91.172 – 10.2.91.17210.2.91.172
4610.2.91.173/3210.2.91.173 – 10.2.91.17310.2.91.173
4710.2.91.174/3210.2.91.174 – 10.2.91.17410.2.91.174
4810.2.91.175/3210.2.91.175 – 10.2.91.17510.2.91.175
4910.2.91.176/3210.2.91.176 – 10.2.91.17610.2.91.176
5010.2.91.177/3210.2.91.177 – 10.2.91.17710.2.91.177
5110.2.91.178/3210.2.91.178 – 10.2.91.17810.2.91.178
5210.2.91.179/3210.2.91.179 – 10.2.91.17910.2.91.179
5310.2.91.180/3210.2.91.180 – 10.2.91.18010.2.91.180
5410.2.91.181/3210.2.91.181 – 10.2.91.18110.2.91.181
5510.2.91.182/3210.2.91.182 – 10.2.91.18210.2.91.182
5610.2.91.183/3210.2.91.183 – 10.2.91.18310.2.91.183
5710.2.91.184/3210.2.91.184 – 10.2.91.18410.2.91.184
5810.2.91.185/3210.2.91.185 – 10.2.91.18510.2.91.185
5910.2.91.186/3210.2.91.186 – 10.2.91.18610.2.91.186
6010.2.91.187/3210.2.91.187 – 10.2.91.18710.2.91.187
6110.2.91.188/3210.2.91.188 – 10.2.91.18810.2.91.188
6210.2.91.189/3210.2.91.189 – 10.2.91.18910.2.91.189
6310.2.91.190/3210.2.91.190 – 10.2.91.19010.2.91.190
6410.2.91.191/3210.2.91.191 – 10.2.91.19110.2.91.191
6510.2.91.192/3210.2.91.192 – 10.2.91.19210.2.91.192
6610.2.91.193/3210.2.91.193 – 10.2.91.19310.2.91.193
6710.2.91.194/3210.2.91.194 – 10.2.91.19410.2.91.194
6810.2.91.195/3210.2.91.195 – 10.2.91.19510.2.91.195
6910.2.91.196/3210.2.91.196 – 10.2.91.19610.2.91.196
7010.2.91.197/3210.2.91.197 – 10.2.91.19710.2.91.197
7110.2.91.198/3210.2.91.198 – 10.2.91.19810.2.91.198
7210.2.91.199/3210.2.91.199 – 10.2.91.19910.2.91.199
7310.2.91.200/3210.2.91.200 – 10.2.91.20010.2.91.200
7410.2.91.201/3210.2.91.201 – 10.2.91.20110.2.91.201
7510.2.91.202/3210.2.91.202 – 10.2.91.20210.2.91.202
7610.2.91.203/3210.2.91.203 – 10.2.91.20310.2.91.203
7710.2.91.204/3210.2.91.204 – 10.2.91.20410.2.91.204
7810.2.91.205/3210.2.91.205 – 10.2.91.20510.2.91.205
7910.2.91.206/3210.2.91.206 – 10.2.91.20610.2.91.206
8010.2.91.207/3210.2.91.207 – 10.2.91.20710.2.91.207
8110.2.91.208/3210.2.91.208 – 10.2.91.20810.2.91.208
8210.2.91.209/3210.2.91.209 – 10.2.91.20910.2.91.209
8310.2.91.210/3210.2.91.210 – 10.2.91.21010.2.91.210
8410.2.91.211/3210.2.91.211 – 10.2.91.21110.2.91.211
8510.2.91.212/3210.2.91.212 – 10.2.91.21210.2.91.212
8610.2.91.213/3210.2.91.213 – 10.2.91.21310.2.91.213
8710.2.91.214/3210.2.91.214 – 10.2.91.21410.2.91.214
8810.2.91.215/3210.2.91.215 – 10.2.91.21510.2.91.215
8910.2.91.216/3210.2.91.216 – 10.2.91.21610.2.91.216
9010.2.91.217/3210.2.91.217 – 10.2.91.21710.2.91.217
9110.2.91.218/3210.2.91.218 – 10.2.91.21810.2.91.218
9210.2.91.219/3210.2.91.219 – 10.2.91.21910.2.91.219
9310.2.91.220/3210.2.91.220 – 10.2.91.22010.2.91.220
9410.2.91.221/3210.2.91.221 – 10.2.91.22110.2.91.221
9510.2.91.222/3210.2.91.222 – 10.2.91.22210.2.91.222
9610.2.91.223/3210.2.91.223 – 10.2.91.22310.2.91.223
9710.2.91.224/3210.2.91.224 – 10.2.91.22410.2.91.224
9810.2.91.225/3210.2.91.225 – 10.2.91.22510.2.91.225
9910.2.91.226/3210.2.91.226 – 10.2.91.22610.2.91.226
10010.2.91.227/3210.2.91.227 – 10.2.91.22710.2.91.227
10110.2.91.228/3210.2.91.228 – 10.2.91.22810.2.91.228
10210.2.91.229/3210.2.91.229 – 10.2.91.22910.2.91.229
10310.2.91.230/3210.2.91.230 – 10.2.91.23010.2.91.230
10410.2.91.231/3210.2.91.231 – 10.2.91.23110.2.91.231
10510.2.91.232/3210.2.91.232 – 10.2.91.23210.2.91.232
10610.2.91.233/3210.2.91.233 – 10.2.91.23310.2.91.233
10710.2.91.234/3210.2.91.234 – 10.2.91.23410.2.91.234
10810.2.91.235/3210.2.91.235 – 10.2.91.23510.2.91.235
10910.2.91.236/3210.2.91.236 – 10.2.91.23610.2.91.236
11010.2.91.237/3210.2.91.237 – 10.2.91.23710.2.91.237
11110.2.91.238/3210.2.91.238 – 10.2.91.23810.2.91.238
11210.2.91.239/3210.2.91.239 – 10.2.91.23910.2.91.239
11310.2.91.240/3210.2.91.240 – 10.2.91.24010.2.91.240
11410.2.91.241/3210.2.91.241 – 10.2.91.24110.2.91.241
11510.2.91.242/3210.2.91.242 – 10.2.91.24210.2.91.242
11610.2.91.243/3210.2.91.243 – 10.2.91.24310.2.91.243
11710.2.91.244/3210.2.91.244 – 10.2.91.24410.2.91.244
11810.2.91.245/3210.2.91.245 – 10.2.91.24510.2.91.245
11910.2.91.246/3210.2.91.246 – 10.2.91.24610.2.91.246
12010.2.91.247/3210.2.91.247 – 10.2.91.24710.2.91.247
12110.2.91.248/3210.2.91.248 – 10.2.91.24810.2.91.248
12210.2.91.249/3210.2.91.249 – 10.2.91.24910.2.91.249
12310.2.91.250/3210.2.91.250 – 10.2.91.25010.2.91.250
12410.2.91.251/3210.2.91.251 – 10.2.91.25110.2.91.251
12510.2.91.252/3210.2.91.252 – 10.2.91.25210.2.91.252
12610.2.91.253/3210.2.91.253 – 10.2.91.25310.2.91.253
12710.2.91.254/3210.2.91.254 – 10.2.91.25410.2.91.254
12810.2.91.255/3210.2.91.255 – 10.2.91.25510.2.91.255
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 →