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)10.2.18.128/25
network10.2.18.128/25
broadcast10.2.18.255
first host10.2.18.129
last host10.2.18.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.18.128/25
address00001010.00000010.00010010.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.00010010.10000000
broadcast00001010.00000010.00010010.11111111
green = network part, grey = host part
hex0x0a021280
decimal167907968
reverse dns128.18.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:1280

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.2.18.128/3210.2.18.128 – 10.2.18.12810.2.18.128
210.2.18.129/3210.2.18.129 – 10.2.18.12910.2.18.129
310.2.18.130/3210.2.18.130 – 10.2.18.13010.2.18.130
410.2.18.131/3210.2.18.131 – 10.2.18.13110.2.18.131
510.2.18.132/3210.2.18.132 – 10.2.18.13210.2.18.132
610.2.18.133/3210.2.18.133 – 10.2.18.13310.2.18.133
710.2.18.134/3210.2.18.134 – 10.2.18.13410.2.18.134
810.2.18.135/3210.2.18.135 – 10.2.18.13510.2.18.135
910.2.18.136/3210.2.18.136 – 10.2.18.13610.2.18.136
1010.2.18.137/3210.2.18.137 – 10.2.18.13710.2.18.137
1110.2.18.138/3210.2.18.138 – 10.2.18.13810.2.18.138
1210.2.18.139/3210.2.18.139 – 10.2.18.13910.2.18.139
1310.2.18.140/3210.2.18.140 – 10.2.18.14010.2.18.140
1410.2.18.141/3210.2.18.141 – 10.2.18.14110.2.18.141
1510.2.18.142/3210.2.18.142 – 10.2.18.14210.2.18.142
1610.2.18.143/3210.2.18.143 – 10.2.18.14310.2.18.143
1710.2.18.144/3210.2.18.144 – 10.2.18.14410.2.18.144
1810.2.18.145/3210.2.18.145 – 10.2.18.14510.2.18.145
1910.2.18.146/3210.2.18.146 – 10.2.18.14610.2.18.146
2010.2.18.147/3210.2.18.147 – 10.2.18.14710.2.18.147
2110.2.18.148/3210.2.18.148 – 10.2.18.14810.2.18.148
2210.2.18.149/3210.2.18.149 – 10.2.18.14910.2.18.149
2310.2.18.150/3210.2.18.150 – 10.2.18.15010.2.18.150
2410.2.18.151/3210.2.18.151 – 10.2.18.15110.2.18.151
2510.2.18.152/3210.2.18.152 – 10.2.18.15210.2.18.152
2610.2.18.153/3210.2.18.153 – 10.2.18.15310.2.18.153
2710.2.18.154/3210.2.18.154 – 10.2.18.15410.2.18.154
2810.2.18.155/3210.2.18.155 – 10.2.18.15510.2.18.155
2910.2.18.156/3210.2.18.156 – 10.2.18.15610.2.18.156
3010.2.18.157/3210.2.18.157 – 10.2.18.15710.2.18.157
3110.2.18.158/3210.2.18.158 – 10.2.18.15810.2.18.158
3210.2.18.159/3210.2.18.159 – 10.2.18.15910.2.18.159
3310.2.18.160/3210.2.18.160 – 10.2.18.16010.2.18.160
3410.2.18.161/3210.2.18.161 – 10.2.18.16110.2.18.161
3510.2.18.162/3210.2.18.162 – 10.2.18.16210.2.18.162
3610.2.18.163/3210.2.18.163 – 10.2.18.16310.2.18.163
3710.2.18.164/3210.2.18.164 – 10.2.18.16410.2.18.164
3810.2.18.165/3210.2.18.165 – 10.2.18.16510.2.18.165
3910.2.18.166/3210.2.18.166 – 10.2.18.16610.2.18.166
4010.2.18.167/3210.2.18.167 – 10.2.18.16710.2.18.167
4110.2.18.168/3210.2.18.168 – 10.2.18.16810.2.18.168
4210.2.18.169/3210.2.18.169 – 10.2.18.16910.2.18.169
4310.2.18.170/3210.2.18.170 – 10.2.18.17010.2.18.170
4410.2.18.171/3210.2.18.171 – 10.2.18.17110.2.18.171
4510.2.18.172/3210.2.18.172 – 10.2.18.17210.2.18.172
4610.2.18.173/3210.2.18.173 – 10.2.18.17310.2.18.173
4710.2.18.174/3210.2.18.174 – 10.2.18.17410.2.18.174
4810.2.18.175/3210.2.18.175 – 10.2.18.17510.2.18.175
4910.2.18.176/3210.2.18.176 – 10.2.18.17610.2.18.176
5010.2.18.177/3210.2.18.177 – 10.2.18.17710.2.18.177
5110.2.18.178/3210.2.18.178 – 10.2.18.17810.2.18.178
5210.2.18.179/3210.2.18.179 – 10.2.18.17910.2.18.179
5310.2.18.180/3210.2.18.180 – 10.2.18.18010.2.18.180
5410.2.18.181/3210.2.18.181 – 10.2.18.18110.2.18.181
5510.2.18.182/3210.2.18.182 – 10.2.18.18210.2.18.182
5610.2.18.183/3210.2.18.183 – 10.2.18.18310.2.18.183
5710.2.18.184/3210.2.18.184 – 10.2.18.18410.2.18.184
5810.2.18.185/3210.2.18.185 – 10.2.18.18510.2.18.185
5910.2.18.186/3210.2.18.186 – 10.2.18.18610.2.18.186
6010.2.18.187/3210.2.18.187 – 10.2.18.18710.2.18.187
6110.2.18.188/3210.2.18.188 – 10.2.18.18810.2.18.188
6210.2.18.189/3210.2.18.189 – 10.2.18.18910.2.18.189
6310.2.18.190/3210.2.18.190 – 10.2.18.19010.2.18.190
6410.2.18.191/3210.2.18.191 – 10.2.18.19110.2.18.191
6510.2.18.192/3210.2.18.192 – 10.2.18.19210.2.18.192
6610.2.18.193/3210.2.18.193 – 10.2.18.19310.2.18.193
6710.2.18.194/3210.2.18.194 – 10.2.18.19410.2.18.194
6810.2.18.195/3210.2.18.195 – 10.2.18.19510.2.18.195
6910.2.18.196/3210.2.18.196 – 10.2.18.19610.2.18.196
7010.2.18.197/3210.2.18.197 – 10.2.18.19710.2.18.197
7110.2.18.198/3210.2.18.198 – 10.2.18.19810.2.18.198
7210.2.18.199/3210.2.18.199 – 10.2.18.19910.2.18.199
7310.2.18.200/3210.2.18.200 – 10.2.18.20010.2.18.200
7410.2.18.201/3210.2.18.201 – 10.2.18.20110.2.18.201
7510.2.18.202/3210.2.18.202 – 10.2.18.20210.2.18.202
7610.2.18.203/3210.2.18.203 – 10.2.18.20310.2.18.203
7710.2.18.204/3210.2.18.204 – 10.2.18.20410.2.18.204
7810.2.18.205/3210.2.18.205 – 10.2.18.20510.2.18.205
7910.2.18.206/3210.2.18.206 – 10.2.18.20610.2.18.206
8010.2.18.207/3210.2.18.207 – 10.2.18.20710.2.18.207
8110.2.18.208/3210.2.18.208 – 10.2.18.20810.2.18.208
8210.2.18.209/3210.2.18.209 – 10.2.18.20910.2.18.209
8310.2.18.210/3210.2.18.210 – 10.2.18.21010.2.18.210
8410.2.18.211/3210.2.18.211 – 10.2.18.21110.2.18.211
8510.2.18.212/3210.2.18.212 – 10.2.18.21210.2.18.212
8610.2.18.213/3210.2.18.213 – 10.2.18.21310.2.18.213
8710.2.18.214/3210.2.18.214 – 10.2.18.21410.2.18.214
8810.2.18.215/3210.2.18.215 – 10.2.18.21510.2.18.215
8910.2.18.216/3210.2.18.216 – 10.2.18.21610.2.18.216
9010.2.18.217/3210.2.18.217 – 10.2.18.21710.2.18.217
9110.2.18.218/3210.2.18.218 – 10.2.18.21810.2.18.218
9210.2.18.219/3210.2.18.219 – 10.2.18.21910.2.18.219
9310.2.18.220/3210.2.18.220 – 10.2.18.22010.2.18.220
9410.2.18.221/3210.2.18.221 – 10.2.18.22110.2.18.221
9510.2.18.222/3210.2.18.222 – 10.2.18.22210.2.18.222
9610.2.18.223/3210.2.18.223 – 10.2.18.22310.2.18.223
9710.2.18.224/3210.2.18.224 – 10.2.18.22410.2.18.224
9810.2.18.225/3210.2.18.225 – 10.2.18.22510.2.18.225
9910.2.18.226/3210.2.18.226 – 10.2.18.22610.2.18.226
10010.2.18.227/3210.2.18.227 – 10.2.18.22710.2.18.227
10110.2.18.228/3210.2.18.228 – 10.2.18.22810.2.18.228
10210.2.18.229/3210.2.18.229 – 10.2.18.22910.2.18.229
10310.2.18.230/3210.2.18.230 – 10.2.18.23010.2.18.230
10410.2.18.231/3210.2.18.231 – 10.2.18.23110.2.18.231
10510.2.18.232/3210.2.18.232 – 10.2.18.23210.2.18.232
10610.2.18.233/3210.2.18.233 – 10.2.18.23310.2.18.233
10710.2.18.234/3210.2.18.234 – 10.2.18.23410.2.18.234
10810.2.18.235/3210.2.18.235 – 10.2.18.23510.2.18.235
10910.2.18.236/3210.2.18.236 – 10.2.18.23610.2.18.236
11010.2.18.237/3210.2.18.237 – 10.2.18.23710.2.18.237
11110.2.18.238/3210.2.18.238 – 10.2.18.23810.2.18.238
11210.2.18.239/3210.2.18.239 – 10.2.18.23910.2.18.239
11310.2.18.240/3210.2.18.240 – 10.2.18.24010.2.18.240
11410.2.18.241/3210.2.18.241 – 10.2.18.24110.2.18.241
11510.2.18.242/3210.2.18.242 – 10.2.18.24210.2.18.242
11610.2.18.243/3210.2.18.243 – 10.2.18.24310.2.18.243
11710.2.18.244/3210.2.18.244 – 10.2.18.24410.2.18.244
11810.2.18.245/3210.2.18.245 – 10.2.18.24510.2.18.245
11910.2.18.246/3210.2.18.246 – 10.2.18.24610.2.18.246
12010.2.18.247/3210.2.18.247 – 10.2.18.24710.2.18.247
12110.2.18.248/3210.2.18.248 – 10.2.18.24810.2.18.248
12210.2.18.249/3210.2.18.249 – 10.2.18.24910.2.18.249
12310.2.18.250/3210.2.18.250 – 10.2.18.25010.2.18.250
12410.2.18.251/3210.2.18.251 – 10.2.18.25110.2.18.251
12510.2.18.252/3210.2.18.252 – 10.2.18.25210.2.18.252
12610.2.18.253/3210.2.18.253 – 10.2.18.25310.2.18.253
12710.2.18.254/3210.2.18.254 – 10.2.18.25410.2.18.254
12810.2.18.255/3210.2.18.255 – 10.2.18.25510.2.18.255
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 →