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)10.3.131.128/25
network10.3.131.128/25
broadcast10.3.131.255
first host10.3.131.129
last host10.3.131.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.3.131.128/25
address00001010.00000011.10000011.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000011.10000011.10000000
broadcast00001010.00000011.10000011.11111111
green = network part, grey = host part
hex0x0a038380
decimal168002432
reverse dns128.131.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:8380

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.3.131.128/3210.3.131.128 – 10.3.131.12810.3.131.128
210.3.131.129/3210.3.131.129 – 10.3.131.12910.3.131.129
310.3.131.130/3210.3.131.130 – 10.3.131.13010.3.131.130
410.3.131.131/3210.3.131.131 – 10.3.131.13110.3.131.131
510.3.131.132/3210.3.131.132 – 10.3.131.13210.3.131.132
610.3.131.133/3210.3.131.133 – 10.3.131.13310.3.131.133
710.3.131.134/3210.3.131.134 – 10.3.131.13410.3.131.134
810.3.131.135/3210.3.131.135 – 10.3.131.13510.3.131.135
910.3.131.136/3210.3.131.136 – 10.3.131.13610.3.131.136
1010.3.131.137/3210.3.131.137 – 10.3.131.13710.3.131.137
1110.3.131.138/3210.3.131.138 – 10.3.131.13810.3.131.138
1210.3.131.139/3210.3.131.139 – 10.3.131.13910.3.131.139
1310.3.131.140/3210.3.131.140 – 10.3.131.14010.3.131.140
1410.3.131.141/3210.3.131.141 – 10.3.131.14110.3.131.141
1510.3.131.142/3210.3.131.142 – 10.3.131.14210.3.131.142
1610.3.131.143/3210.3.131.143 – 10.3.131.14310.3.131.143
1710.3.131.144/3210.3.131.144 – 10.3.131.14410.3.131.144
1810.3.131.145/3210.3.131.145 – 10.3.131.14510.3.131.145
1910.3.131.146/3210.3.131.146 – 10.3.131.14610.3.131.146
2010.3.131.147/3210.3.131.147 – 10.3.131.14710.3.131.147
2110.3.131.148/3210.3.131.148 – 10.3.131.14810.3.131.148
2210.3.131.149/3210.3.131.149 – 10.3.131.14910.3.131.149
2310.3.131.150/3210.3.131.150 – 10.3.131.15010.3.131.150
2410.3.131.151/3210.3.131.151 – 10.3.131.15110.3.131.151
2510.3.131.152/3210.3.131.152 – 10.3.131.15210.3.131.152
2610.3.131.153/3210.3.131.153 – 10.3.131.15310.3.131.153
2710.3.131.154/3210.3.131.154 – 10.3.131.15410.3.131.154
2810.3.131.155/3210.3.131.155 – 10.3.131.15510.3.131.155
2910.3.131.156/3210.3.131.156 – 10.3.131.15610.3.131.156
3010.3.131.157/3210.3.131.157 – 10.3.131.15710.3.131.157
3110.3.131.158/3210.3.131.158 – 10.3.131.15810.3.131.158
3210.3.131.159/3210.3.131.159 – 10.3.131.15910.3.131.159
3310.3.131.160/3210.3.131.160 – 10.3.131.16010.3.131.160
3410.3.131.161/3210.3.131.161 – 10.3.131.16110.3.131.161
3510.3.131.162/3210.3.131.162 – 10.3.131.16210.3.131.162
3610.3.131.163/3210.3.131.163 – 10.3.131.16310.3.131.163
3710.3.131.164/3210.3.131.164 – 10.3.131.16410.3.131.164
3810.3.131.165/3210.3.131.165 – 10.3.131.16510.3.131.165
3910.3.131.166/3210.3.131.166 – 10.3.131.16610.3.131.166
4010.3.131.167/3210.3.131.167 – 10.3.131.16710.3.131.167
4110.3.131.168/3210.3.131.168 – 10.3.131.16810.3.131.168
4210.3.131.169/3210.3.131.169 – 10.3.131.16910.3.131.169
4310.3.131.170/3210.3.131.170 – 10.3.131.17010.3.131.170
4410.3.131.171/3210.3.131.171 – 10.3.131.17110.3.131.171
4510.3.131.172/3210.3.131.172 – 10.3.131.17210.3.131.172
4610.3.131.173/3210.3.131.173 – 10.3.131.17310.3.131.173
4710.3.131.174/3210.3.131.174 – 10.3.131.17410.3.131.174
4810.3.131.175/3210.3.131.175 – 10.3.131.17510.3.131.175
4910.3.131.176/3210.3.131.176 – 10.3.131.17610.3.131.176
5010.3.131.177/3210.3.131.177 – 10.3.131.17710.3.131.177
5110.3.131.178/3210.3.131.178 – 10.3.131.17810.3.131.178
5210.3.131.179/3210.3.131.179 – 10.3.131.17910.3.131.179
5310.3.131.180/3210.3.131.180 – 10.3.131.18010.3.131.180
5410.3.131.181/3210.3.131.181 – 10.3.131.18110.3.131.181
5510.3.131.182/3210.3.131.182 – 10.3.131.18210.3.131.182
5610.3.131.183/3210.3.131.183 – 10.3.131.18310.3.131.183
5710.3.131.184/3210.3.131.184 – 10.3.131.18410.3.131.184
5810.3.131.185/3210.3.131.185 – 10.3.131.18510.3.131.185
5910.3.131.186/3210.3.131.186 – 10.3.131.18610.3.131.186
6010.3.131.187/3210.3.131.187 – 10.3.131.18710.3.131.187
6110.3.131.188/3210.3.131.188 – 10.3.131.18810.3.131.188
6210.3.131.189/3210.3.131.189 – 10.3.131.18910.3.131.189
6310.3.131.190/3210.3.131.190 – 10.3.131.19010.3.131.190
6410.3.131.191/3210.3.131.191 – 10.3.131.19110.3.131.191
6510.3.131.192/3210.3.131.192 – 10.3.131.19210.3.131.192
6610.3.131.193/3210.3.131.193 – 10.3.131.19310.3.131.193
6710.3.131.194/3210.3.131.194 – 10.3.131.19410.3.131.194
6810.3.131.195/3210.3.131.195 – 10.3.131.19510.3.131.195
6910.3.131.196/3210.3.131.196 – 10.3.131.19610.3.131.196
7010.3.131.197/3210.3.131.197 – 10.3.131.19710.3.131.197
7110.3.131.198/3210.3.131.198 – 10.3.131.19810.3.131.198
7210.3.131.199/3210.3.131.199 – 10.3.131.19910.3.131.199
7310.3.131.200/3210.3.131.200 – 10.3.131.20010.3.131.200
7410.3.131.201/3210.3.131.201 – 10.3.131.20110.3.131.201
7510.3.131.202/3210.3.131.202 – 10.3.131.20210.3.131.202
7610.3.131.203/3210.3.131.203 – 10.3.131.20310.3.131.203
7710.3.131.204/3210.3.131.204 – 10.3.131.20410.3.131.204
7810.3.131.205/3210.3.131.205 – 10.3.131.20510.3.131.205
7910.3.131.206/3210.3.131.206 – 10.3.131.20610.3.131.206
8010.3.131.207/3210.3.131.207 – 10.3.131.20710.3.131.207
8110.3.131.208/3210.3.131.208 – 10.3.131.20810.3.131.208
8210.3.131.209/3210.3.131.209 – 10.3.131.20910.3.131.209
8310.3.131.210/3210.3.131.210 – 10.3.131.21010.3.131.210
8410.3.131.211/3210.3.131.211 – 10.3.131.21110.3.131.211
8510.3.131.212/3210.3.131.212 – 10.3.131.21210.3.131.212
8610.3.131.213/3210.3.131.213 – 10.3.131.21310.3.131.213
8710.3.131.214/3210.3.131.214 – 10.3.131.21410.3.131.214
8810.3.131.215/3210.3.131.215 – 10.3.131.21510.3.131.215
8910.3.131.216/3210.3.131.216 – 10.3.131.21610.3.131.216
9010.3.131.217/3210.3.131.217 – 10.3.131.21710.3.131.217
9110.3.131.218/3210.3.131.218 – 10.3.131.21810.3.131.218
9210.3.131.219/3210.3.131.219 – 10.3.131.21910.3.131.219
9310.3.131.220/3210.3.131.220 – 10.3.131.22010.3.131.220
9410.3.131.221/3210.3.131.221 – 10.3.131.22110.3.131.221
9510.3.131.222/3210.3.131.222 – 10.3.131.22210.3.131.222
9610.3.131.223/3210.3.131.223 – 10.3.131.22310.3.131.223
9710.3.131.224/3210.3.131.224 – 10.3.131.22410.3.131.224
9810.3.131.225/3210.3.131.225 – 10.3.131.22510.3.131.225
9910.3.131.226/3210.3.131.226 – 10.3.131.22610.3.131.226
10010.3.131.227/3210.3.131.227 – 10.3.131.22710.3.131.227
10110.3.131.228/3210.3.131.228 – 10.3.131.22810.3.131.228
10210.3.131.229/3210.3.131.229 – 10.3.131.22910.3.131.229
10310.3.131.230/3210.3.131.230 – 10.3.131.23010.3.131.230
10410.3.131.231/3210.3.131.231 – 10.3.131.23110.3.131.231
10510.3.131.232/3210.3.131.232 – 10.3.131.23210.3.131.232
10610.3.131.233/3210.3.131.233 – 10.3.131.23310.3.131.233
10710.3.131.234/3210.3.131.234 – 10.3.131.23410.3.131.234
10810.3.131.235/3210.3.131.235 – 10.3.131.23510.3.131.235
10910.3.131.236/3210.3.131.236 – 10.3.131.23610.3.131.236
11010.3.131.237/3210.3.131.237 – 10.3.131.23710.3.131.237
11110.3.131.238/3210.3.131.238 – 10.3.131.23810.3.131.238
11210.3.131.239/3210.3.131.239 – 10.3.131.23910.3.131.239
11310.3.131.240/3210.3.131.240 – 10.3.131.24010.3.131.240
11410.3.131.241/3210.3.131.241 – 10.3.131.24110.3.131.241
11510.3.131.242/3210.3.131.242 – 10.3.131.24210.3.131.242
11610.3.131.243/3210.3.131.243 – 10.3.131.24310.3.131.243
11710.3.131.244/3210.3.131.244 – 10.3.131.24410.3.131.244
11810.3.131.245/3210.3.131.245 – 10.3.131.24510.3.131.245
11910.3.131.246/3210.3.131.246 – 10.3.131.24610.3.131.246
12010.3.131.247/3210.3.131.247 – 10.3.131.24710.3.131.247
12110.3.131.248/3210.3.131.248 – 10.3.131.24810.3.131.248
12210.3.131.249/3210.3.131.249 – 10.3.131.24910.3.131.249
12310.3.131.250/3210.3.131.250 – 10.3.131.25010.3.131.250
12410.3.131.251/3210.3.131.251 – 10.3.131.25110.3.131.251
12510.3.131.252/3210.3.131.252 – 10.3.131.25210.3.131.252
12610.3.131.253/3210.3.131.253 – 10.3.131.25310.3.131.253
12710.3.131.254/3210.3.131.254 – 10.3.131.25410.3.131.254
12810.3.131.255/3210.3.131.255 – 10.3.131.25510.3.131.255
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 →