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)10.0.100.128/25
network10.0.100.128/25
broadcast10.0.100.255
first host10.0.100.129
last host10.0.100.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.0.100.128/25
address00001010.00000000.01100100.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000000.01100100.10000000
broadcast00001010.00000000.01100100.11111111
green = network part, grey = host part
hex0x0a006480
decimal167797888
reverse dns128.100.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:6480

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.0.100.128/3210.0.100.128 – 10.0.100.12810.0.100.128
210.0.100.129/3210.0.100.129 – 10.0.100.12910.0.100.129
310.0.100.130/3210.0.100.130 – 10.0.100.13010.0.100.130
410.0.100.131/3210.0.100.131 – 10.0.100.13110.0.100.131
510.0.100.132/3210.0.100.132 – 10.0.100.13210.0.100.132
610.0.100.133/3210.0.100.133 – 10.0.100.13310.0.100.133
710.0.100.134/3210.0.100.134 – 10.0.100.13410.0.100.134
810.0.100.135/3210.0.100.135 – 10.0.100.13510.0.100.135
910.0.100.136/3210.0.100.136 – 10.0.100.13610.0.100.136
1010.0.100.137/3210.0.100.137 – 10.0.100.13710.0.100.137
1110.0.100.138/3210.0.100.138 – 10.0.100.13810.0.100.138
1210.0.100.139/3210.0.100.139 – 10.0.100.13910.0.100.139
1310.0.100.140/3210.0.100.140 – 10.0.100.14010.0.100.140
1410.0.100.141/3210.0.100.141 – 10.0.100.14110.0.100.141
1510.0.100.142/3210.0.100.142 – 10.0.100.14210.0.100.142
1610.0.100.143/3210.0.100.143 – 10.0.100.14310.0.100.143
1710.0.100.144/3210.0.100.144 – 10.0.100.14410.0.100.144
1810.0.100.145/3210.0.100.145 – 10.0.100.14510.0.100.145
1910.0.100.146/3210.0.100.146 – 10.0.100.14610.0.100.146
2010.0.100.147/3210.0.100.147 – 10.0.100.14710.0.100.147
2110.0.100.148/3210.0.100.148 – 10.0.100.14810.0.100.148
2210.0.100.149/3210.0.100.149 – 10.0.100.14910.0.100.149
2310.0.100.150/3210.0.100.150 – 10.0.100.15010.0.100.150
2410.0.100.151/3210.0.100.151 – 10.0.100.15110.0.100.151
2510.0.100.152/3210.0.100.152 – 10.0.100.15210.0.100.152
2610.0.100.153/3210.0.100.153 – 10.0.100.15310.0.100.153
2710.0.100.154/3210.0.100.154 – 10.0.100.15410.0.100.154
2810.0.100.155/3210.0.100.155 – 10.0.100.15510.0.100.155
2910.0.100.156/3210.0.100.156 – 10.0.100.15610.0.100.156
3010.0.100.157/3210.0.100.157 – 10.0.100.15710.0.100.157
3110.0.100.158/3210.0.100.158 – 10.0.100.15810.0.100.158
3210.0.100.159/3210.0.100.159 – 10.0.100.15910.0.100.159
3310.0.100.160/3210.0.100.160 – 10.0.100.16010.0.100.160
3410.0.100.161/3210.0.100.161 – 10.0.100.16110.0.100.161
3510.0.100.162/3210.0.100.162 – 10.0.100.16210.0.100.162
3610.0.100.163/3210.0.100.163 – 10.0.100.16310.0.100.163
3710.0.100.164/3210.0.100.164 – 10.0.100.16410.0.100.164
3810.0.100.165/3210.0.100.165 – 10.0.100.16510.0.100.165
3910.0.100.166/3210.0.100.166 – 10.0.100.16610.0.100.166
4010.0.100.167/3210.0.100.167 – 10.0.100.16710.0.100.167
4110.0.100.168/3210.0.100.168 – 10.0.100.16810.0.100.168
4210.0.100.169/3210.0.100.169 – 10.0.100.16910.0.100.169
4310.0.100.170/3210.0.100.170 – 10.0.100.17010.0.100.170
4410.0.100.171/3210.0.100.171 – 10.0.100.17110.0.100.171
4510.0.100.172/3210.0.100.172 – 10.0.100.17210.0.100.172
4610.0.100.173/3210.0.100.173 – 10.0.100.17310.0.100.173
4710.0.100.174/3210.0.100.174 – 10.0.100.17410.0.100.174
4810.0.100.175/3210.0.100.175 – 10.0.100.17510.0.100.175
4910.0.100.176/3210.0.100.176 – 10.0.100.17610.0.100.176
5010.0.100.177/3210.0.100.177 – 10.0.100.17710.0.100.177
5110.0.100.178/3210.0.100.178 – 10.0.100.17810.0.100.178
5210.0.100.179/3210.0.100.179 – 10.0.100.17910.0.100.179
5310.0.100.180/3210.0.100.180 – 10.0.100.18010.0.100.180
5410.0.100.181/3210.0.100.181 – 10.0.100.18110.0.100.181
5510.0.100.182/3210.0.100.182 – 10.0.100.18210.0.100.182
5610.0.100.183/3210.0.100.183 – 10.0.100.18310.0.100.183
5710.0.100.184/3210.0.100.184 – 10.0.100.18410.0.100.184
5810.0.100.185/3210.0.100.185 – 10.0.100.18510.0.100.185
5910.0.100.186/3210.0.100.186 – 10.0.100.18610.0.100.186
6010.0.100.187/3210.0.100.187 – 10.0.100.18710.0.100.187
6110.0.100.188/3210.0.100.188 – 10.0.100.18810.0.100.188
6210.0.100.189/3210.0.100.189 – 10.0.100.18910.0.100.189
6310.0.100.190/3210.0.100.190 – 10.0.100.19010.0.100.190
6410.0.100.191/3210.0.100.191 – 10.0.100.19110.0.100.191
6510.0.100.192/3210.0.100.192 – 10.0.100.19210.0.100.192
6610.0.100.193/3210.0.100.193 – 10.0.100.19310.0.100.193
6710.0.100.194/3210.0.100.194 – 10.0.100.19410.0.100.194
6810.0.100.195/3210.0.100.195 – 10.0.100.19510.0.100.195
6910.0.100.196/3210.0.100.196 – 10.0.100.19610.0.100.196
7010.0.100.197/3210.0.100.197 – 10.0.100.19710.0.100.197
7110.0.100.198/3210.0.100.198 – 10.0.100.19810.0.100.198
7210.0.100.199/3210.0.100.199 – 10.0.100.19910.0.100.199
7310.0.100.200/3210.0.100.200 – 10.0.100.20010.0.100.200
7410.0.100.201/3210.0.100.201 – 10.0.100.20110.0.100.201
7510.0.100.202/3210.0.100.202 – 10.0.100.20210.0.100.202
7610.0.100.203/3210.0.100.203 – 10.0.100.20310.0.100.203
7710.0.100.204/3210.0.100.204 – 10.0.100.20410.0.100.204
7810.0.100.205/3210.0.100.205 – 10.0.100.20510.0.100.205
7910.0.100.206/3210.0.100.206 – 10.0.100.20610.0.100.206
8010.0.100.207/3210.0.100.207 – 10.0.100.20710.0.100.207
8110.0.100.208/3210.0.100.208 – 10.0.100.20810.0.100.208
8210.0.100.209/3210.0.100.209 – 10.0.100.20910.0.100.209
8310.0.100.210/3210.0.100.210 – 10.0.100.21010.0.100.210
8410.0.100.211/3210.0.100.211 – 10.0.100.21110.0.100.211
8510.0.100.212/3210.0.100.212 – 10.0.100.21210.0.100.212
8610.0.100.213/3210.0.100.213 – 10.0.100.21310.0.100.213
8710.0.100.214/3210.0.100.214 – 10.0.100.21410.0.100.214
8810.0.100.215/3210.0.100.215 – 10.0.100.21510.0.100.215
8910.0.100.216/3210.0.100.216 – 10.0.100.21610.0.100.216
9010.0.100.217/3210.0.100.217 – 10.0.100.21710.0.100.217
9110.0.100.218/3210.0.100.218 – 10.0.100.21810.0.100.218
9210.0.100.219/3210.0.100.219 – 10.0.100.21910.0.100.219
9310.0.100.220/3210.0.100.220 – 10.0.100.22010.0.100.220
9410.0.100.221/3210.0.100.221 – 10.0.100.22110.0.100.221
9510.0.100.222/3210.0.100.222 – 10.0.100.22210.0.100.222
9610.0.100.223/3210.0.100.223 – 10.0.100.22310.0.100.223
9710.0.100.224/3210.0.100.224 – 10.0.100.22410.0.100.224
9810.0.100.225/3210.0.100.225 – 10.0.100.22510.0.100.225
9910.0.100.226/3210.0.100.226 – 10.0.100.22610.0.100.226
10010.0.100.227/3210.0.100.227 – 10.0.100.22710.0.100.227
10110.0.100.228/3210.0.100.228 – 10.0.100.22810.0.100.228
10210.0.100.229/3210.0.100.229 – 10.0.100.22910.0.100.229
10310.0.100.230/3210.0.100.230 – 10.0.100.23010.0.100.230
10410.0.100.231/3210.0.100.231 – 10.0.100.23110.0.100.231
10510.0.100.232/3210.0.100.232 – 10.0.100.23210.0.100.232
10610.0.100.233/3210.0.100.233 – 10.0.100.23310.0.100.233
10710.0.100.234/3210.0.100.234 – 10.0.100.23410.0.100.234
10810.0.100.235/3210.0.100.235 – 10.0.100.23510.0.100.235
10910.0.100.236/3210.0.100.236 – 10.0.100.23610.0.100.236
11010.0.100.237/3210.0.100.237 – 10.0.100.23710.0.100.237
11110.0.100.238/3210.0.100.238 – 10.0.100.23810.0.100.238
11210.0.100.239/3210.0.100.239 – 10.0.100.23910.0.100.239
11310.0.100.240/3210.0.100.240 – 10.0.100.24010.0.100.240
11410.0.100.241/3210.0.100.241 – 10.0.100.24110.0.100.241
11510.0.100.242/3210.0.100.242 – 10.0.100.24210.0.100.242
11610.0.100.243/3210.0.100.243 – 10.0.100.24310.0.100.243
11710.0.100.244/3210.0.100.244 – 10.0.100.24410.0.100.244
11810.0.100.245/3210.0.100.245 – 10.0.100.24510.0.100.245
11910.0.100.246/3210.0.100.246 – 10.0.100.24610.0.100.246
12010.0.100.247/3210.0.100.247 – 10.0.100.24710.0.100.247
12110.0.100.248/3210.0.100.248 – 10.0.100.24810.0.100.248
12210.0.100.249/3210.0.100.249 – 10.0.100.24910.0.100.249
12310.0.100.250/3210.0.100.250 – 10.0.100.25010.0.100.250
12410.0.100.251/3210.0.100.251 – 10.0.100.25110.0.100.251
12510.0.100.252/3210.0.100.252 – 10.0.100.25210.0.100.252
12610.0.100.253/3210.0.100.253 – 10.0.100.25310.0.100.253
12710.0.100.254/3210.0.100.254 – 10.0.100.25410.0.100.254
12810.0.100.255/3210.0.100.255 – 10.0.100.25510.0.100.255
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 →