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)10.2.255.128/25
network10.2.255.128/25
broadcast10.2.255.255
first host10.2.255.129
last host10.2.255.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.255.128/25
address00001010.00000010.11111111.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.11111111.10000000
broadcast00001010.00000010.11111111.11111111
green = network part, grey = host part
hex0x0a02ff80
decimal167968640
reverse dns128.255.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:ff80

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.2.255.128/3210.2.255.128 – 10.2.255.12810.2.255.128
210.2.255.129/3210.2.255.129 – 10.2.255.12910.2.255.129
310.2.255.130/3210.2.255.130 – 10.2.255.13010.2.255.130
410.2.255.131/3210.2.255.131 – 10.2.255.13110.2.255.131
510.2.255.132/3210.2.255.132 – 10.2.255.13210.2.255.132
610.2.255.133/3210.2.255.133 – 10.2.255.13310.2.255.133
710.2.255.134/3210.2.255.134 – 10.2.255.13410.2.255.134
810.2.255.135/3210.2.255.135 – 10.2.255.13510.2.255.135
910.2.255.136/3210.2.255.136 – 10.2.255.13610.2.255.136
1010.2.255.137/3210.2.255.137 – 10.2.255.13710.2.255.137
1110.2.255.138/3210.2.255.138 – 10.2.255.13810.2.255.138
1210.2.255.139/3210.2.255.139 – 10.2.255.13910.2.255.139
1310.2.255.140/3210.2.255.140 – 10.2.255.14010.2.255.140
1410.2.255.141/3210.2.255.141 – 10.2.255.14110.2.255.141
1510.2.255.142/3210.2.255.142 – 10.2.255.14210.2.255.142
1610.2.255.143/3210.2.255.143 – 10.2.255.14310.2.255.143
1710.2.255.144/3210.2.255.144 – 10.2.255.14410.2.255.144
1810.2.255.145/3210.2.255.145 – 10.2.255.14510.2.255.145
1910.2.255.146/3210.2.255.146 – 10.2.255.14610.2.255.146
2010.2.255.147/3210.2.255.147 – 10.2.255.14710.2.255.147
2110.2.255.148/3210.2.255.148 – 10.2.255.14810.2.255.148
2210.2.255.149/3210.2.255.149 – 10.2.255.14910.2.255.149
2310.2.255.150/3210.2.255.150 – 10.2.255.15010.2.255.150
2410.2.255.151/3210.2.255.151 – 10.2.255.15110.2.255.151
2510.2.255.152/3210.2.255.152 – 10.2.255.15210.2.255.152
2610.2.255.153/3210.2.255.153 – 10.2.255.15310.2.255.153
2710.2.255.154/3210.2.255.154 – 10.2.255.15410.2.255.154
2810.2.255.155/3210.2.255.155 – 10.2.255.15510.2.255.155
2910.2.255.156/3210.2.255.156 – 10.2.255.15610.2.255.156
3010.2.255.157/3210.2.255.157 – 10.2.255.15710.2.255.157
3110.2.255.158/3210.2.255.158 – 10.2.255.15810.2.255.158
3210.2.255.159/3210.2.255.159 – 10.2.255.15910.2.255.159
3310.2.255.160/3210.2.255.160 – 10.2.255.16010.2.255.160
3410.2.255.161/3210.2.255.161 – 10.2.255.16110.2.255.161
3510.2.255.162/3210.2.255.162 – 10.2.255.16210.2.255.162
3610.2.255.163/3210.2.255.163 – 10.2.255.16310.2.255.163
3710.2.255.164/3210.2.255.164 – 10.2.255.16410.2.255.164
3810.2.255.165/3210.2.255.165 – 10.2.255.16510.2.255.165
3910.2.255.166/3210.2.255.166 – 10.2.255.16610.2.255.166
4010.2.255.167/3210.2.255.167 – 10.2.255.16710.2.255.167
4110.2.255.168/3210.2.255.168 – 10.2.255.16810.2.255.168
4210.2.255.169/3210.2.255.169 – 10.2.255.16910.2.255.169
4310.2.255.170/3210.2.255.170 – 10.2.255.17010.2.255.170
4410.2.255.171/3210.2.255.171 – 10.2.255.17110.2.255.171
4510.2.255.172/3210.2.255.172 – 10.2.255.17210.2.255.172
4610.2.255.173/3210.2.255.173 – 10.2.255.17310.2.255.173
4710.2.255.174/3210.2.255.174 – 10.2.255.17410.2.255.174
4810.2.255.175/3210.2.255.175 – 10.2.255.17510.2.255.175
4910.2.255.176/3210.2.255.176 – 10.2.255.17610.2.255.176
5010.2.255.177/3210.2.255.177 – 10.2.255.17710.2.255.177
5110.2.255.178/3210.2.255.178 – 10.2.255.17810.2.255.178
5210.2.255.179/3210.2.255.179 – 10.2.255.17910.2.255.179
5310.2.255.180/3210.2.255.180 – 10.2.255.18010.2.255.180
5410.2.255.181/3210.2.255.181 – 10.2.255.18110.2.255.181
5510.2.255.182/3210.2.255.182 – 10.2.255.18210.2.255.182
5610.2.255.183/3210.2.255.183 – 10.2.255.18310.2.255.183
5710.2.255.184/3210.2.255.184 – 10.2.255.18410.2.255.184
5810.2.255.185/3210.2.255.185 – 10.2.255.18510.2.255.185
5910.2.255.186/3210.2.255.186 – 10.2.255.18610.2.255.186
6010.2.255.187/3210.2.255.187 – 10.2.255.18710.2.255.187
6110.2.255.188/3210.2.255.188 – 10.2.255.18810.2.255.188
6210.2.255.189/3210.2.255.189 – 10.2.255.18910.2.255.189
6310.2.255.190/3210.2.255.190 – 10.2.255.19010.2.255.190
6410.2.255.191/3210.2.255.191 – 10.2.255.19110.2.255.191
6510.2.255.192/3210.2.255.192 – 10.2.255.19210.2.255.192
6610.2.255.193/3210.2.255.193 – 10.2.255.19310.2.255.193
6710.2.255.194/3210.2.255.194 – 10.2.255.19410.2.255.194
6810.2.255.195/3210.2.255.195 – 10.2.255.19510.2.255.195
6910.2.255.196/3210.2.255.196 – 10.2.255.19610.2.255.196
7010.2.255.197/3210.2.255.197 – 10.2.255.19710.2.255.197
7110.2.255.198/3210.2.255.198 – 10.2.255.19810.2.255.198
7210.2.255.199/3210.2.255.199 – 10.2.255.19910.2.255.199
7310.2.255.200/3210.2.255.200 – 10.2.255.20010.2.255.200
7410.2.255.201/3210.2.255.201 – 10.2.255.20110.2.255.201
7510.2.255.202/3210.2.255.202 – 10.2.255.20210.2.255.202
7610.2.255.203/3210.2.255.203 – 10.2.255.20310.2.255.203
7710.2.255.204/3210.2.255.204 – 10.2.255.20410.2.255.204
7810.2.255.205/3210.2.255.205 – 10.2.255.20510.2.255.205
7910.2.255.206/3210.2.255.206 – 10.2.255.20610.2.255.206
8010.2.255.207/3210.2.255.207 – 10.2.255.20710.2.255.207
8110.2.255.208/3210.2.255.208 – 10.2.255.20810.2.255.208
8210.2.255.209/3210.2.255.209 – 10.2.255.20910.2.255.209
8310.2.255.210/3210.2.255.210 – 10.2.255.21010.2.255.210
8410.2.255.211/3210.2.255.211 – 10.2.255.21110.2.255.211
8510.2.255.212/3210.2.255.212 – 10.2.255.21210.2.255.212
8610.2.255.213/3210.2.255.213 – 10.2.255.21310.2.255.213
8710.2.255.214/3210.2.255.214 – 10.2.255.21410.2.255.214
8810.2.255.215/3210.2.255.215 – 10.2.255.21510.2.255.215
8910.2.255.216/3210.2.255.216 – 10.2.255.21610.2.255.216
9010.2.255.217/3210.2.255.217 – 10.2.255.21710.2.255.217
9110.2.255.218/3210.2.255.218 – 10.2.255.21810.2.255.218
9210.2.255.219/3210.2.255.219 – 10.2.255.21910.2.255.219
9310.2.255.220/3210.2.255.220 – 10.2.255.22010.2.255.220
9410.2.255.221/3210.2.255.221 – 10.2.255.22110.2.255.221
9510.2.255.222/3210.2.255.222 – 10.2.255.22210.2.255.222
9610.2.255.223/3210.2.255.223 – 10.2.255.22310.2.255.223
9710.2.255.224/3210.2.255.224 – 10.2.255.22410.2.255.224
9810.2.255.225/3210.2.255.225 – 10.2.255.22510.2.255.225
9910.2.255.226/3210.2.255.226 – 10.2.255.22610.2.255.226
10010.2.255.227/3210.2.255.227 – 10.2.255.22710.2.255.227
10110.2.255.228/3210.2.255.228 – 10.2.255.22810.2.255.228
10210.2.255.229/3210.2.255.229 – 10.2.255.22910.2.255.229
10310.2.255.230/3210.2.255.230 – 10.2.255.23010.2.255.230
10410.2.255.231/3210.2.255.231 – 10.2.255.23110.2.255.231
10510.2.255.232/3210.2.255.232 – 10.2.255.23210.2.255.232
10610.2.255.233/3210.2.255.233 – 10.2.255.23310.2.255.233
10710.2.255.234/3210.2.255.234 – 10.2.255.23410.2.255.234
10810.2.255.235/3210.2.255.235 – 10.2.255.23510.2.255.235
10910.2.255.236/3210.2.255.236 – 10.2.255.23610.2.255.236
11010.2.255.237/3210.2.255.237 – 10.2.255.23710.2.255.237
11110.2.255.238/3210.2.255.238 – 10.2.255.23810.2.255.238
11210.2.255.239/3210.2.255.239 – 10.2.255.23910.2.255.239
11310.2.255.240/3210.2.255.240 – 10.2.255.24010.2.255.240
11410.2.255.241/3210.2.255.241 – 10.2.255.24110.2.255.241
11510.2.255.242/3210.2.255.242 – 10.2.255.24210.2.255.242
11610.2.255.243/3210.2.255.243 – 10.2.255.24310.2.255.243
11710.2.255.244/3210.2.255.244 – 10.2.255.24410.2.255.244
11810.2.255.245/3210.2.255.245 – 10.2.255.24510.2.255.245
11910.2.255.246/3210.2.255.246 – 10.2.255.24610.2.255.246
12010.2.255.247/3210.2.255.247 – 10.2.255.24710.2.255.247
12110.2.255.248/3210.2.255.248 – 10.2.255.24810.2.255.248
12210.2.255.249/3210.2.255.249 – 10.2.255.24910.2.255.249
12310.2.255.250/3210.2.255.250 – 10.2.255.25010.2.255.250
12410.2.255.251/3210.2.255.251 – 10.2.255.25110.2.255.251
12510.2.255.252/3210.2.255.252 – 10.2.255.25210.2.255.252
12610.2.255.253/3210.2.255.253 – 10.2.255.25310.2.255.253
12710.2.255.254/3210.2.255.254 – 10.2.255.25410.2.255.254
12810.2.255.255/3210.2.255.255 – 10.2.255.25510.2.255.255
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 →