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)10.2.28.128/25
network10.2.28.128/25
broadcast10.2.28.255
first host10.2.28.129
last host10.2.28.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.28.128/25
address00001010.00000010.00011100.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.00011100.10000000
broadcast00001010.00000010.00011100.11111111
green = network part, grey = host part
hex0x0a021c80
decimal167910528
reverse dns128.28.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:1c80

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.2.28.128/3210.2.28.128 – 10.2.28.12810.2.28.128
210.2.28.129/3210.2.28.129 – 10.2.28.12910.2.28.129
310.2.28.130/3210.2.28.130 – 10.2.28.13010.2.28.130
410.2.28.131/3210.2.28.131 – 10.2.28.13110.2.28.131
510.2.28.132/3210.2.28.132 – 10.2.28.13210.2.28.132
610.2.28.133/3210.2.28.133 – 10.2.28.13310.2.28.133
710.2.28.134/3210.2.28.134 – 10.2.28.13410.2.28.134
810.2.28.135/3210.2.28.135 – 10.2.28.13510.2.28.135
910.2.28.136/3210.2.28.136 – 10.2.28.13610.2.28.136
1010.2.28.137/3210.2.28.137 – 10.2.28.13710.2.28.137
1110.2.28.138/3210.2.28.138 – 10.2.28.13810.2.28.138
1210.2.28.139/3210.2.28.139 – 10.2.28.13910.2.28.139
1310.2.28.140/3210.2.28.140 – 10.2.28.14010.2.28.140
1410.2.28.141/3210.2.28.141 – 10.2.28.14110.2.28.141
1510.2.28.142/3210.2.28.142 – 10.2.28.14210.2.28.142
1610.2.28.143/3210.2.28.143 – 10.2.28.14310.2.28.143
1710.2.28.144/3210.2.28.144 – 10.2.28.14410.2.28.144
1810.2.28.145/3210.2.28.145 – 10.2.28.14510.2.28.145
1910.2.28.146/3210.2.28.146 – 10.2.28.14610.2.28.146
2010.2.28.147/3210.2.28.147 – 10.2.28.14710.2.28.147
2110.2.28.148/3210.2.28.148 – 10.2.28.14810.2.28.148
2210.2.28.149/3210.2.28.149 – 10.2.28.14910.2.28.149
2310.2.28.150/3210.2.28.150 – 10.2.28.15010.2.28.150
2410.2.28.151/3210.2.28.151 – 10.2.28.15110.2.28.151
2510.2.28.152/3210.2.28.152 – 10.2.28.15210.2.28.152
2610.2.28.153/3210.2.28.153 – 10.2.28.15310.2.28.153
2710.2.28.154/3210.2.28.154 – 10.2.28.15410.2.28.154
2810.2.28.155/3210.2.28.155 – 10.2.28.15510.2.28.155
2910.2.28.156/3210.2.28.156 – 10.2.28.15610.2.28.156
3010.2.28.157/3210.2.28.157 – 10.2.28.15710.2.28.157
3110.2.28.158/3210.2.28.158 – 10.2.28.15810.2.28.158
3210.2.28.159/3210.2.28.159 – 10.2.28.15910.2.28.159
3310.2.28.160/3210.2.28.160 – 10.2.28.16010.2.28.160
3410.2.28.161/3210.2.28.161 – 10.2.28.16110.2.28.161
3510.2.28.162/3210.2.28.162 – 10.2.28.16210.2.28.162
3610.2.28.163/3210.2.28.163 – 10.2.28.16310.2.28.163
3710.2.28.164/3210.2.28.164 – 10.2.28.16410.2.28.164
3810.2.28.165/3210.2.28.165 – 10.2.28.16510.2.28.165
3910.2.28.166/3210.2.28.166 – 10.2.28.16610.2.28.166
4010.2.28.167/3210.2.28.167 – 10.2.28.16710.2.28.167
4110.2.28.168/3210.2.28.168 – 10.2.28.16810.2.28.168
4210.2.28.169/3210.2.28.169 – 10.2.28.16910.2.28.169
4310.2.28.170/3210.2.28.170 – 10.2.28.17010.2.28.170
4410.2.28.171/3210.2.28.171 – 10.2.28.17110.2.28.171
4510.2.28.172/3210.2.28.172 – 10.2.28.17210.2.28.172
4610.2.28.173/3210.2.28.173 – 10.2.28.17310.2.28.173
4710.2.28.174/3210.2.28.174 – 10.2.28.17410.2.28.174
4810.2.28.175/3210.2.28.175 – 10.2.28.17510.2.28.175
4910.2.28.176/3210.2.28.176 – 10.2.28.17610.2.28.176
5010.2.28.177/3210.2.28.177 – 10.2.28.17710.2.28.177
5110.2.28.178/3210.2.28.178 – 10.2.28.17810.2.28.178
5210.2.28.179/3210.2.28.179 – 10.2.28.17910.2.28.179
5310.2.28.180/3210.2.28.180 – 10.2.28.18010.2.28.180
5410.2.28.181/3210.2.28.181 – 10.2.28.18110.2.28.181
5510.2.28.182/3210.2.28.182 – 10.2.28.18210.2.28.182
5610.2.28.183/3210.2.28.183 – 10.2.28.18310.2.28.183
5710.2.28.184/3210.2.28.184 – 10.2.28.18410.2.28.184
5810.2.28.185/3210.2.28.185 – 10.2.28.18510.2.28.185
5910.2.28.186/3210.2.28.186 – 10.2.28.18610.2.28.186
6010.2.28.187/3210.2.28.187 – 10.2.28.18710.2.28.187
6110.2.28.188/3210.2.28.188 – 10.2.28.18810.2.28.188
6210.2.28.189/3210.2.28.189 – 10.2.28.18910.2.28.189
6310.2.28.190/3210.2.28.190 – 10.2.28.19010.2.28.190
6410.2.28.191/3210.2.28.191 – 10.2.28.19110.2.28.191
6510.2.28.192/3210.2.28.192 – 10.2.28.19210.2.28.192
6610.2.28.193/3210.2.28.193 – 10.2.28.19310.2.28.193
6710.2.28.194/3210.2.28.194 – 10.2.28.19410.2.28.194
6810.2.28.195/3210.2.28.195 – 10.2.28.19510.2.28.195
6910.2.28.196/3210.2.28.196 – 10.2.28.19610.2.28.196
7010.2.28.197/3210.2.28.197 – 10.2.28.19710.2.28.197
7110.2.28.198/3210.2.28.198 – 10.2.28.19810.2.28.198
7210.2.28.199/3210.2.28.199 – 10.2.28.19910.2.28.199
7310.2.28.200/3210.2.28.200 – 10.2.28.20010.2.28.200
7410.2.28.201/3210.2.28.201 – 10.2.28.20110.2.28.201
7510.2.28.202/3210.2.28.202 – 10.2.28.20210.2.28.202
7610.2.28.203/3210.2.28.203 – 10.2.28.20310.2.28.203
7710.2.28.204/3210.2.28.204 – 10.2.28.20410.2.28.204
7810.2.28.205/3210.2.28.205 – 10.2.28.20510.2.28.205
7910.2.28.206/3210.2.28.206 – 10.2.28.20610.2.28.206
8010.2.28.207/3210.2.28.207 – 10.2.28.20710.2.28.207
8110.2.28.208/3210.2.28.208 – 10.2.28.20810.2.28.208
8210.2.28.209/3210.2.28.209 – 10.2.28.20910.2.28.209
8310.2.28.210/3210.2.28.210 – 10.2.28.21010.2.28.210
8410.2.28.211/3210.2.28.211 – 10.2.28.21110.2.28.211
8510.2.28.212/3210.2.28.212 – 10.2.28.21210.2.28.212
8610.2.28.213/3210.2.28.213 – 10.2.28.21310.2.28.213
8710.2.28.214/3210.2.28.214 – 10.2.28.21410.2.28.214
8810.2.28.215/3210.2.28.215 – 10.2.28.21510.2.28.215
8910.2.28.216/3210.2.28.216 – 10.2.28.21610.2.28.216
9010.2.28.217/3210.2.28.217 – 10.2.28.21710.2.28.217
9110.2.28.218/3210.2.28.218 – 10.2.28.21810.2.28.218
9210.2.28.219/3210.2.28.219 – 10.2.28.21910.2.28.219
9310.2.28.220/3210.2.28.220 – 10.2.28.22010.2.28.220
9410.2.28.221/3210.2.28.221 – 10.2.28.22110.2.28.221
9510.2.28.222/3210.2.28.222 – 10.2.28.22210.2.28.222
9610.2.28.223/3210.2.28.223 – 10.2.28.22310.2.28.223
9710.2.28.224/3210.2.28.224 – 10.2.28.22410.2.28.224
9810.2.28.225/3210.2.28.225 – 10.2.28.22510.2.28.225
9910.2.28.226/3210.2.28.226 – 10.2.28.22610.2.28.226
10010.2.28.227/3210.2.28.227 – 10.2.28.22710.2.28.227
10110.2.28.228/3210.2.28.228 – 10.2.28.22810.2.28.228
10210.2.28.229/3210.2.28.229 – 10.2.28.22910.2.28.229
10310.2.28.230/3210.2.28.230 – 10.2.28.23010.2.28.230
10410.2.28.231/3210.2.28.231 – 10.2.28.23110.2.28.231
10510.2.28.232/3210.2.28.232 – 10.2.28.23210.2.28.232
10610.2.28.233/3210.2.28.233 – 10.2.28.23310.2.28.233
10710.2.28.234/3210.2.28.234 – 10.2.28.23410.2.28.234
10810.2.28.235/3210.2.28.235 – 10.2.28.23510.2.28.235
10910.2.28.236/3210.2.28.236 – 10.2.28.23610.2.28.236
11010.2.28.237/3210.2.28.237 – 10.2.28.23710.2.28.237
11110.2.28.238/3210.2.28.238 – 10.2.28.23810.2.28.238
11210.2.28.239/3210.2.28.239 – 10.2.28.23910.2.28.239
11310.2.28.240/3210.2.28.240 – 10.2.28.24010.2.28.240
11410.2.28.241/3210.2.28.241 – 10.2.28.24110.2.28.241
11510.2.28.242/3210.2.28.242 – 10.2.28.24210.2.28.242
11610.2.28.243/3210.2.28.243 – 10.2.28.24310.2.28.243
11710.2.28.244/3210.2.28.244 – 10.2.28.24410.2.28.244
11810.2.28.245/3210.2.28.245 – 10.2.28.24510.2.28.245
11910.2.28.246/3210.2.28.246 – 10.2.28.24610.2.28.246
12010.2.28.247/3210.2.28.247 – 10.2.28.24710.2.28.247
12110.2.28.248/3210.2.28.248 – 10.2.28.24810.2.28.248
12210.2.28.249/3210.2.28.249 – 10.2.28.24910.2.28.249
12310.2.28.250/3210.2.28.250 – 10.2.28.25010.2.28.250
12410.2.28.251/3210.2.28.251 – 10.2.28.25110.2.28.251
12510.2.28.252/3210.2.28.252 – 10.2.28.25210.2.28.252
12610.2.28.253/3210.2.28.253 – 10.2.28.25310.2.28.253
12710.2.28.254/3210.2.28.254 – 10.2.28.25410.2.28.254
12810.2.28.255/3210.2.28.255 – 10.2.28.25510.2.28.255
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 →