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)10.2.5.128/25
network10.2.5.128/25
broadcast10.2.5.255
first host10.2.5.129
last host10.2.5.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.5.128/25
address00001010.00000010.00000101.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.00000101.10000000
broadcast00001010.00000010.00000101.11111111
green = network part, grey = host part
hex0x0a020580
decimal167904640
reverse dns128.5.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:580

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.2.5.128/3210.2.5.128 – 10.2.5.12810.2.5.128
210.2.5.129/3210.2.5.129 – 10.2.5.12910.2.5.129
310.2.5.130/3210.2.5.130 – 10.2.5.13010.2.5.130
410.2.5.131/3210.2.5.131 – 10.2.5.13110.2.5.131
510.2.5.132/3210.2.5.132 – 10.2.5.13210.2.5.132
610.2.5.133/3210.2.5.133 – 10.2.5.13310.2.5.133
710.2.5.134/3210.2.5.134 – 10.2.5.13410.2.5.134
810.2.5.135/3210.2.5.135 – 10.2.5.13510.2.5.135
910.2.5.136/3210.2.5.136 – 10.2.5.13610.2.5.136
1010.2.5.137/3210.2.5.137 – 10.2.5.13710.2.5.137
1110.2.5.138/3210.2.5.138 – 10.2.5.13810.2.5.138
1210.2.5.139/3210.2.5.139 – 10.2.5.13910.2.5.139
1310.2.5.140/3210.2.5.140 – 10.2.5.14010.2.5.140
1410.2.5.141/3210.2.5.141 – 10.2.5.14110.2.5.141
1510.2.5.142/3210.2.5.142 – 10.2.5.14210.2.5.142
1610.2.5.143/3210.2.5.143 – 10.2.5.14310.2.5.143
1710.2.5.144/3210.2.5.144 – 10.2.5.14410.2.5.144
1810.2.5.145/3210.2.5.145 – 10.2.5.14510.2.5.145
1910.2.5.146/3210.2.5.146 – 10.2.5.14610.2.5.146
2010.2.5.147/3210.2.5.147 – 10.2.5.14710.2.5.147
2110.2.5.148/3210.2.5.148 – 10.2.5.14810.2.5.148
2210.2.5.149/3210.2.5.149 – 10.2.5.14910.2.5.149
2310.2.5.150/3210.2.5.150 – 10.2.5.15010.2.5.150
2410.2.5.151/3210.2.5.151 – 10.2.5.15110.2.5.151
2510.2.5.152/3210.2.5.152 – 10.2.5.15210.2.5.152
2610.2.5.153/3210.2.5.153 – 10.2.5.15310.2.5.153
2710.2.5.154/3210.2.5.154 – 10.2.5.15410.2.5.154
2810.2.5.155/3210.2.5.155 – 10.2.5.15510.2.5.155
2910.2.5.156/3210.2.5.156 – 10.2.5.15610.2.5.156
3010.2.5.157/3210.2.5.157 – 10.2.5.15710.2.5.157
3110.2.5.158/3210.2.5.158 – 10.2.5.15810.2.5.158
3210.2.5.159/3210.2.5.159 – 10.2.5.15910.2.5.159
3310.2.5.160/3210.2.5.160 – 10.2.5.16010.2.5.160
3410.2.5.161/3210.2.5.161 – 10.2.5.16110.2.5.161
3510.2.5.162/3210.2.5.162 – 10.2.5.16210.2.5.162
3610.2.5.163/3210.2.5.163 – 10.2.5.16310.2.5.163
3710.2.5.164/3210.2.5.164 – 10.2.5.16410.2.5.164
3810.2.5.165/3210.2.5.165 – 10.2.5.16510.2.5.165
3910.2.5.166/3210.2.5.166 – 10.2.5.16610.2.5.166
4010.2.5.167/3210.2.5.167 – 10.2.5.16710.2.5.167
4110.2.5.168/3210.2.5.168 – 10.2.5.16810.2.5.168
4210.2.5.169/3210.2.5.169 – 10.2.5.16910.2.5.169
4310.2.5.170/3210.2.5.170 – 10.2.5.17010.2.5.170
4410.2.5.171/3210.2.5.171 – 10.2.5.17110.2.5.171
4510.2.5.172/3210.2.5.172 – 10.2.5.17210.2.5.172
4610.2.5.173/3210.2.5.173 – 10.2.5.17310.2.5.173
4710.2.5.174/3210.2.5.174 – 10.2.5.17410.2.5.174
4810.2.5.175/3210.2.5.175 – 10.2.5.17510.2.5.175
4910.2.5.176/3210.2.5.176 – 10.2.5.17610.2.5.176
5010.2.5.177/3210.2.5.177 – 10.2.5.17710.2.5.177
5110.2.5.178/3210.2.5.178 – 10.2.5.17810.2.5.178
5210.2.5.179/3210.2.5.179 – 10.2.5.17910.2.5.179
5310.2.5.180/3210.2.5.180 – 10.2.5.18010.2.5.180
5410.2.5.181/3210.2.5.181 – 10.2.5.18110.2.5.181
5510.2.5.182/3210.2.5.182 – 10.2.5.18210.2.5.182
5610.2.5.183/3210.2.5.183 – 10.2.5.18310.2.5.183
5710.2.5.184/3210.2.5.184 – 10.2.5.18410.2.5.184
5810.2.5.185/3210.2.5.185 – 10.2.5.18510.2.5.185
5910.2.5.186/3210.2.5.186 – 10.2.5.18610.2.5.186
6010.2.5.187/3210.2.5.187 – 10.2.5.18710.2.5.187
6110.2.5.188/3210.2.5.188 – 10.2.5.18810.2.5.188
6210.2.5.189/3210.2.5.189 – 10.2.5.18910.2.5.189
6310.2.5.190/3210.2.5.190 – 10.2.5.19010.2.5.190
6410.2.5.191/3210.2.5.191 – 10.2.5.19110.2.5.191
6510.2.5.192/3210.2.5.192 – 10.2.5.19210.2.5.192
6610.2.5.193/3210.2.5.193 – 10.2.5.19310.2.5.193
6710.2.5.194/3210.2.5.194 – 10.2.5.19410.2.5.194
6810.2.5.195/3210.2.5.195 – 10.2.5.19510.2.5.195
6910.2.5.196/3210.2.5.196 – 10.2.5.19610.2.5.196
7010.2.5.197/3210.2.5.197 – 10.2.5.19710.2.5.197
7110.2.5.198/3210.2.5.198 – 10.2.5.19810.2.5.198
7210.2.5.199/3210.2.5.199 – 10.2.5.19910.2.5.199
7310.2.5.200/3210.2.5.200 – 10.2.5.20010.2.5.200
7410.2.5.201/3210.2.5.201 – 10.2.5.20110.2.5.201
7510.2.5.202/3210.2.5.202 – 10.2.5.20210.2.5.202
7610.2.5.203/3210.2.5.203 – 10.2.5.20310.2.5.203
7710.2.5.204/3210.2.5.204 – 10.2.5.20410.2.5.204
7810.2.5.205/3210.2.5.205 – 10.2.5.20510.2.5.205
7910.2.5.206/3210.2.5.206 – 10.2.5.20610.2.5.206
8010.2.5.207/3210.2.5.207 – 10.2.5.20710.2.5.207
8110.2.5.208/3210.2.5.208 – 10.2.5.20810.2.5.208
8210.2.5.209/3210.2.5.209 – 10.2.5.20910.2.5.209
8310.2.5.210/3210.2.5.210 – 10.2.5.21010.2.5.210
8410.2.5.211/3210.2.5.211 – 10.2.5.21110.2.5.211
8510.2.5.212/3210.2.5.212 – 10.2.5.21210.2.5.212
8610.2.5.213/3210.2.5.213 – 10.2.5.21310.2.5.213
8710.2.5.214/3210.2.5.214 – 10.2.5.21410.2.5.214
8810.2.5.215/3210.2.5.215 – 10.2.5.21510.2.5.215
8910.2.5.216/3210.2.5.216 – 10.2.5.21610.2.5.216
9010.2.5.217/3210.2.5.217 – 10.2.5.21710.2.5.217
9110.2.5.218/3210.2.5.218 – 10.2.5.21810.2.5.218
9210.2.5.219/3210.2.5.219 – 10.2.5.21910.2.5.219
9310.2.5.220/3210.2.5.220 – 10.2.5.22010.2.5.220
9410.2.5.221/3210.2.5.221 – 10.2.5.22110.2.5.221
9510.2.5.222/3210.2.5.222 – 10.2.5.22210.2.5.222
9610.2.5.223/3210.2.5.223 – 10.2.5.22310.2.5.223
9710.2.5.224/3210.2.5.224 – 10.2.5.22410.2.5.224
9810.2.5.225/3210.2.5.225 – 10.2.5.22510.2.5.225
9910.2.5.226/3210.2.5.226 – 10.2.5.22610.2.5.226
10010.2.5.227/3210.2.5.227 – 10.2.5.22710.2.5.227
10110.2.5.228/3210.2.5.228 – 10.2.5.22810.2.5.228
10210.2.5.229/3210.2.5.229 – 10.2.5.22910.2.5.229
10310.2.5.230/3210.2.5.230 – 10.2.5.23010.2.5.230
10410.2.5.231/3210.2.5.231 – 10.2.5.23110.2.5.231
10510.2.5.232/3210.2.5.232 – 10.2.5.23210.2.5.232
10610.2.5.233/3210.2.5.233 – 10.2.5.23310.2.5.233
10710.2.5.234/3210.2.5.234 – 10.2.5.23410.2.5.234
10810.2.5.235/3210.2.5.235 – 10.2.5.23510.2.5.235
10910.2.5.236/3210.2.5.236 – 10.2.5.23610.2.5.236
11010.2.5.237/3210.2.5.237 – 10.2.5.23710.2.5.237
11110.2.5.238/3210.2.5.238 – 10.2.5.23810.2.5.238
11210.2.5.239/3210.2.5.239 – 10.2.5.23910.2.5.239
11310.2.5.240/3210.2.5.240 – 10.2.5.24010.2.5.240
11410.2.5.241/3210.2.5.241 – 10.2.5.24110.2.5.241
11510.2.5.242/3210.2.5.242 – 10.2.5.24210.2.5.242
11610.2.5.243/3210.2.5.243 – 10.2.5.24310.2.5.243
11710.2.5.244/3210.2.5.244 – 10.2.5.24410.2.5.244
11810.2.5.245/3210.2.5.245 – 10.2.5.24510.2.5.245
11910.2.5.246/3210.2.5.246 – 10.2.5.24610.2.5.246
12010.2.5.247/3210.2.5.247 – 10.2.5.24710.2.5.247
12110.2.5.248/3210.2.5.248 – 10.2.5.24810.2.5.248
12210.2.5.249/3210.2.5.249 – 10.2.5.24910.2.5.249
12310.2.5.250/3210.2.5.250 – 10.2.5.25010.2.5.250
12410.2.5.251/3210.2.5.251 – 10.2.5.25110.2.5.251
12510.2.5.252/3210.2.5.252 – 10.2.5.25210.2.5.252
12610.2.5.253/3210.2.5.253 – 10.2.5.25310.2.5.253
12710.2.5.254/3210.2.5.254 – 10.2.5.25410.2.5.254
12810.2.5.255/3210.2.5.255 – 10.2.5.25510.2.5.255
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 →