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)10.0.64.128/25
network10.0.64.128/25
broadcast10.0.64.255
first host10.0.64.129
last host10.0.64.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.0.64.128/25
address00001010.00000000.01000000.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000000.01000000.10000000
broadcast00001010.00000000.01000000.11111111
green = network part, grey = host part
hex0x0a004080
decimal167788672
reverse dns128.64.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:4080

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.0.64.128/3210.0.64.128 – 10.0.64.12810.0.64.128
210.0.64.129/3210.0.64.129 – 10.0.64.12910.0.64.129
310.0.64.130/3210.0.64.130 – 10.0.64.13010.0.64.130
410.0.64.131/3210.0.64.131 – 10.0.64.13110.0.64.131
510.0.64.132/3210.0.64.132 – 10.0.64.13210.0.64.132
610.0.64.133/3210.0.64.133 – 10.0.64.13310.0.64.133
710.0.64.134/3210.0.64.134 – 10.0.64.13410.0.64.134
810.0.64.135/3210.0.64.135 – 10.0.64.13510.0.64.135
910.0.64.136/3210.0.64.136 – 10.0.64.13610.0.64.136
1010.0.64.137/3210.0.64.137 – 10.0.64.13710.0.64.137
1110.0.64.138/3210.0.64.138 – 10.0.64.13810.0.64.138
1210.0.64.139/3210.0.64.139 – 10.0.64.13910.0.64.139
1310.0.64.140/3210.0.64.140 – 10.0.64.14010.0.64.140
1410.0.64.141/3210.0.64.141 – 10.0.64.14110.0.64.141
1510.0.64.142/3210.0.64.142 – 10.0.64.14210.0.64.142
1610.0.64.143/3210.0.64.143 – 10.0.64.14310.0.64.143
1710.0.64.144/3210.0.64.144 – 10.0.64.14410.0.64.144
1810.0.64.145/3210.0.64.145 – 10.0.64.14510.0.64.145
1910.0.64.146/3210.0.64.146 – 10.0.64.14610.0.64.146
2010.0.64.147/3210.0.64.147 – 10.0.64.14710.0.64.147
2110.0.64.148/3210.0.64.148 – 10.0.64.14810.0.64.148
2210.0.64.149/3210.0.64.149 – 10.0.64.14910.0.64.149
2310.0.64.150/3210.0.64.150 – 10.0.64.15010.0.64.150
2410.0.64.151/3210.0.64.151 – 10.0.64.15110.0.64.151
2510.0.64.152/3210.0.64.152 – 10.0.64.15210.0.64.152
2610.0.64.153/3210.0.64.153 – 10.0.64.15310.0.64.153
2710.0.64.154/3210.0.64.154 – 10.0.64.15410.0.64.154
2810.0.64.155/3210.0.64.155 – 10.0.64.15510.0.64.155
2910.0.64.156/3210.0.64.156 – 10.0.64.15610.0.64.156
3010.0.64.157/3210.0.64.157 – 10.0.64.15710.0.64.157
3110.0.64.158/3210.0.64.158 – 10.0.64.15810.0.64.158
3210.0.64.159/3210.0.64.159 – 10.0.64.15910.0.64.159
3310.0.64.160/3210.0.64.160 – 10.0.64.16010.0.64.160
3410.0.64.161/3210.0.64.161 – 10.0.64.16110.0.64.161
3510.0.64.162/3210.0.64.162 – 10.0.64.16210.0.64.162
3610.0.64.163/3210.0.64.163 – 10.0.64.16310.0.64.163
3710.0.64.164/3210.0.64.164 – 10.0.64.16410.0.64.164
3810.0.64.165/3210.0.64.165 – 10.0.64.16510.0.64.165
3910.0.64.166/3210.0.64.166 – 10.0.64.16610.0.64.166
4010.0.64.167/3210.0.64.167 – 10.0.64.16710.0.64.167
4110.0.64.168/3210.0.64.168 – 10.0.64.16810.0.64.168
4210.0.64.169/3210.0.64.169 – 10.0.64.16910.0.64.169
4310.0.64.170/3210.0.64.170 – 10.0.64.17010.0.64.170
4410.0.64.171/3210.0.64.171 – 10.0.64.17110.0.64.171
4510.0.64.172/3210.0.64.172 – 10.0.64.17210.0.64.172
4610.0.64.173/3210.0.64.173 – 10.0.64.17310.0.64.173
4710.0.64.174/3210.0.64.174 – 10.0.64.17410.0.64.174
4810.0.64.175/3210.0.64.175 – 10.0.64.17510.0.64.175
4910.0.64.176/3210.0.64.176 – 10.0.64.17610.0.64.176
5010.0.64.177/3210.0.64.177 – 10.0.64.17710.0.64.177
5110.0.64.178/3210.0.64.178 – 10.0.64.17810.0.64.178
5210.0.64.179/3210.0.64.179 – 10.0.64.17910.0.64.179
5310.0.64.180/3210.0.64.180 – 10.0.64.18010.0.64.180
5410.0.64.181/3210.0.64.181 – 10.0.64.18110.0.64.181
5510.0.64.182/3210.0.64.182 – 10.0.64.18210.0.64.182
5610.0.64.183/3210.0.64.183 – 10.0.64.18310.0.64.183
5710.0.64.184/3210.0.64.184 – 10.0.64.18410.0.64.184
5810.0.64.185/3210.0.64.185 – 10.0.64.18510.0.64.185
5910.0.64.186/3210.0.64.186 – 10.0.64.18610.0.64.186
6010.0.64.187/3210.0.64.187 – 10.0.64.18710.0.64.187
6110.0.64.188/3210.0.64.188 – 10.0.64.18810.0.64.188
6210.0.64.189/3210.0.64.189 – 10.0.64.18910.0.64.189
6310.0.64.190/3210.0.64.190 – 10.0.64.19010.0.64.190
6410.0.64.191/3210.0.64.191 – 10.0.64.19110.0.64.191
6510.0.64.192/3210.0.64.192 – 10.0.64.19210.0.64.192
6610.0.64.193/3210.0.64.193 – 10.0.64.19310.0.64.193
6710.0.64.194/3210.0.64.194 – 10.0.64.19410.0.64.194
6810.0.64.195/3210.0.64.195 – 10.0.64.19510.0.64.195
6910.0.64.196/3210.0.64.196 – 10.0.64.19610.0.64.196
7010.0.64.197/3210.0.64.197 – 10.0.64.19710.0.64.197
7110.0.64.198/3210.0.64.198 – 10.0.64.19810.0.64.198
7210.0.64.199/3210.0.64.199 – 10.0.64.19910.0.64.199
7310.0.64.200/3210.0.64.200 – 10.0.64.20010.0.64.200
7410.0.64.201/3210.0.64.201 – 10.0.64.20110.0.64.201
7510.0.64.202/3210.0.64.202 – 10.0.64.20210.0.64.202
7610.0.64.203/3210.0.64.203 – 10.0.64.20310.0.64.203
7710.0.64.204/3210.0.64.204 – 10.0.64.20410.0.64.204
7810.0.64.205/3210.0.64.205 – 10.0.64.20510.0.64.205
7910.0.64.206/3210.0.64.206 – 10.0.64.20610.0.64.206
8010.0.64.207/3210.0.64.207 – 10.0.64.20710.0.64.207
8110.0.64.208/3210.0.64.208 – 10.0.64.20810.0.64.208
8210.0.64.209/3210.0.64.209 – 10.0.64.20910.0.64.209
8310.0.64.210/3210.0.64.210 – 10.0.64.21010.0.64.210
8410.0.64.211/3210.0.64.211 – 10.0.64.21110.0.64.211
8510.0.64.212/3210.0.64.212 – 10.0.64.21210.0.64.212
8610.0.64.213/3210.0.64.213 – 10.0.64.21310.0.64.213
8710.0.64.214/3210.0.64.214 – 10.0.64.21410.0.64.214
8810.0.64.215/3210.0.64.215 – 10.0.64.21510.0.64.215
8910.0.64.216/3210.0.64.216 – 10.0.64.21610.0.64.216
9010.0.64.217/3210.0.64.217 – 10.0.64.21710.0.64.217
9110.0.64.218/3210.0.64.218 – 10.0.64.21810.0.64.218
9210.0.64.219/3210.0.64.219 – 10.0.64.21910.0.64.219
9310.0.64.220/3210.0.64.220 – 10.0.64.22010.0.64.220
9410.0.64.221/3210.0.64.221 – 10.0.64.22110.0.64.221
9510.0.64.222/3210.0.64.222 – 10.0.64.22210.0.64.222
9610.0.64.223/3210.0.64.223 – 10.0.64.22310.0.64.223
9710.0.64.224/3210.0.64.224 – 10.0.64.22410.0.64.224
9810.0.64.225/3210.0.64.225 – 10.0.64.22510.0.64.225
9910.0.64.226/3210.0.64.226 – 10.0.64.22610.0.64.226
10010.0.64.227/3210.0.64.227 – 10.0.64.22710.0.64.227
10110.0.64.228/3210.0.64.228 – 10.0.64.22810.0.64.228
10210.0.64.229/3210.0.64.229 – 10.0.64.22910.0.64.229
10310.0.64.230/3210.0.64.230 – 10.0.64.23010.0.64.230
10410.0.64.231/3210.0.64.231 – 10.0.64.23110.0.64.231
10510.0.64.232/3210.0.64.232 – 10.0.64.23210.0.64.232
10610.0.64.233/3210.0.64.233 – 10.0.64.23310.0.64.233
10710.0.64.234/3210.0.64.234 – 10.0.64.23410.0.64.234
10810.0.64.235/3210.0.64.235 – 10.0.64.23510.0.64.235
10910.0.64.236/3210.0.64.236 – 10.0.64.23610.0.64.236
11010.0.64.237/3210.0.64.237 – 10.0.64.23710.0.64.237
11110.0.64.238/3210.0.64.238 – 10.0.64.23810.0.64.238
11210.0.64.239/3210.0.64.239 – 10.0.64.23910.0.64.239
11310.0.64.240/3210.0.64.240 – 10.0.64.24010.0.64.240
11410.0.64.241/3210.0.64.241 – 10.0.64.24110.0.64.241
11510.0.64.242/3210.0.64.242 – 10.0.64.24210.0.64.242
11610.0.64.243/3210.0.64.243 – 10.0.64.24310.0.64.243
11710.0.64.244/3210.0.64.244 – 10.0.64.24410.0.64.244
11810.0.64.245/3210.0.64.245 – 10.0.64.24510.0.64.245
11910.0.64.246/3210.0.64.246 – 10.0.64.24610.0.64.246
12010.0.64.247/3210.0.64.247 – 10.0.64.24710.0.64.247
12110.0.64.248/3210.0.64.248 – 10.0.64.24810.0.64.248
12210.0.64.249/3210.0.64.249 – 10.0.64.24910.0.64.249
12310.0.64.250/3210.0.64.250 – 10.0.64.25010.0.64.250
12410.0.64.251/3210.0.64.251 – 10.0.64.25110.0.64.251
12510.0.64.252/3210.0.64.252 – 10.0.64.25210.0.64.252
12610.0.64.253/3210.0.64.253 – 10.0.64.25310.0.64.253
12710.0.64.254/3210.0.64.254 – 10.0.64.25410.0.64.254
12810.0.64.255/3210.0.64.255 – 10.0.64.25510.0.64.255
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 →