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)10.3.239.128/25
network10.3.239.128/25
broadcast10.3.239.255
first host10.3.239.129
last host10.3.239.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.3.239.128/25
address00001010.00000011.11101111.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000011.11101111.10000000
broadcast00001010.00000011.11101111.11111111
green = network part, grey = host part
hex0x0a03ef80
decimal168030080
reverse dns128.239.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:ef80

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.3.239.128/3210.3.239.128 – 10.3.239.12810.3.239.128
210.3.239.129/3210.3.239.129 – 10.3.239.12910.3.239.129
310.3.239.130/3210.3.239.130 – 10.3.239.13010.3.239.130
410.3.239.131/3210.3.239.131 – 10.3.239.13110.3.239.131
510.3.239.132/3210.3.239.132 – 10.3.239.13210.3.239.132
610.3.239.133/3210.3.239.133 – 10.3.239.13310.3.239.133
710.3.239.134/3210.3.239.134 – 10.3.239.13410.3.239.134
810.3.239.135/3210.3.239.135 – 10.3.239.13510.3.239.135
910.3.239.136/3210.3.239.136 – 10.3.239.13610.3.239.136
1010.3.239.137/3210.3.239.137 – 10.3.239.13710.3.239.137
1110.3.239.138/3210.3.239.138 – 10.3.239.13810.3.239.138
1210.3.239.139/3210.3.239.139 – 10.3.239.13910.3.239.139
1310.3.239.140/3210.3.239.140 – 10.3.239.14010.3.239.140
1410.3.239.141/3210.3.239.141 – 10.3.239.14110.3.239.141
1510.3.239.142/3210.3.239.142 – 10.3.239.14210.3.239.142
1610.3.239.143/3210.3.239.143 – 10.3.239.14310.3.239.143
1710.3.239.144/3210.3.239.144 – 10.3.239.14410.3.239.144
1810.3.239.145/3210.3.239.145 – 10.3.239.14510.3.239.145
1910.3.239.146/3210.3.239.146 – 10.3.239.14610.3.239.146
2010.3.239.147/3210.3.239.147 – 10.3.239.14710.3.239.147
2110.3.239.148/3210.3.239.148 – 10.3.239.14810.3.239.148
2210.3.239.149/3210.3.239.149 – 10.3.239.14910.3.239.149
2310.3.239.150/3210.3.239.150 – 10.3.239.15010.3.239.150
2410.3.239.151/3210.3.239.151 – 10.3.239.15110.3.239.151
2510.3.239.152/3210.3.239.152 – 10.3.239.15210.3.239.152
2610.3.239.153/3210.3.239.153 – 10.3.239.15310.3.239.153
2710.3.239.154/3210.3.239.154 – 10.3.239.15410.3.239.154
2810.3.239.155/3210.3.239.155 – 10.3.239.15510.3.239.155
2910.3.239.156/3210.3.239.156 – 10.3.239.15610.3.239.156
3010.3.239.157/3210.3.239.157 – 10.3.239.15710.3.239.157
3110.3.239.158/3210.3.239.158 – 10.3.239.15810.3.239.158
3210.3.239.159/3210.3.239.159 – 10.3.239.15910.3.239.159
3310.3.239.160/3210.3.239.160 – 10.3.239.16010.3.239.160
3410.3.239.161/3210.3.239.161 – 10.3.239.16110.3.239.161
3510.3.239.162/3210.3.239.162 – 10.3.239.16210.3.239.162
3610.3.239.163/3210.3.239.163 – 10.3.239.16310.3.239.163
3710.3.239.164/3210.3.239.164 – 10.3.239.16410.3.239.164
3810.3.239.165/3210.3.239.165 – 10.3.239.16510.3.239.165
3910.3.239.166/3210.3.239.166 – 10.3.239.16610.3.239.166
4010.3.239.167/3210.3.239.167 – 10.3.239.16710.3.239.167
4110.3.239.168/3210.3.239.168 – 10.3.239.16810.3.239.168
4210.3.239.169/3210.3.239.169 – 10.3.239.16910.3.239.169
4310.3.239.170/3210.3.239.170 – 10.3.239.17010.3.239.170
4410.3.239.171/3210.3.239.171 – 10.3.239.17110.3.239.171
4510.3.239.172/3210.3.239.172 – 10.3.239.17210.3.239.172
4610.3.239.173/3210.3.239.173 – 10.3.239.17310.3.239.173
4710.3.239.174/3210.3.239.174 – 10.3.239.17410.3.239.174
4810.3.239.175/3210.3.239.175 – 10.3.239.17510.3.239.175
4910.3.239.176/3210.3.239.176 – 10.3.239.17610.3.239.176
5010.3.239.177/3210.3.239.177 – 10.3.239.17710.3.239.177
5110.3.239.178/3210.3.239.178 – 10.3.239.17810.3.239.178
5210.3.239.179/3210.3.239.179 – 10.3.239.17910.3.239.179
5310.3.239.180/3210.3.239.180 – 10.3.239.18010.3.239.180
5410.3.239.181/3210.3.239.181 – 10.3.239.18110.3.239.181
5510.3.239.182/3210.3.239.182 – 10.3.239.18210.3.239.182
5610.3.239.183/3210.3.239.183 – 10.3.239.18310.3.239.183
5710.3.239.184/3210.3.239.184 – 10.3.239.18410.3.239.184
5810.3.239.185/3210.3.239.185 – 10.3.239.18510.3.239.185
5910.3.239.186/3210.3.239.186 – 10.3.239.18610.3.239.186
6010.3.239.187/3210.3.239.187 – 10.3.239.18710.3.239.187
6110.3.239.188/3210.3.239.188 – 10.3.239.18810.3.239.188
6210.3.239.189/3210.3.239.189 – 10.3.239.18910.3.239.189
6310.3.239.190/3210.3.239.190 – 10.3.239.19010.3.239.190
6410.3.239.191/3210.3.239.191 – 10.3.239.19110.3.239.191
6510.3.239.192/3210.3.239.192 – 10.3.239.19210.3.239.192
6610.3.239.193/3210.3.239.193 – 10.3.239.19310.3.239.193
6710.3.239.194/3210.3.239.194 – 10.3.239.19410.3.239.194
6810.3.239.195/3210.3.239.195 – 10.3.239.19510.3.239.195
6910.3.239.196/3210.3.239.196 – 10.3.239.19610.3.239.196
7010.3.239.197/3210.3.239.197 – 10.3.239.19710.3.239.197
7110.3.239.198/3210.3.239.198 – 10.3.239.19810.3.239.198
7210.3.239.199/3210.3.239.199 – 10.3.239.19910.3.239.199
7310.3.239.200/3210.3.239.200 – 10.3.239.20010.3.239.200
7410.3.239.201/3210.3.239.201 – 10.3.239.20110.3.239.201
7510.3.239.202/3210.3.239.202 – 10.3.239.20210.3.239.202
7610.3.239.203/3210.3.239.203 – 10.3.239.20310.3.239.203
7710.3.239.204/3210.3.239.204 – 10.3.239.20410.3.239.204
7810.3.239.205/3210.3.239.205 – 10.3.239.20510.3.239.205
7910.3.239.206/3210.3.239.206 – 10.3.239.20610.3.239.206
8010.3.239.207/3210.3.239.207 – 10.3.239.20710.3.239.207
8110.3.239.208/3210.3.239.208 – 10.3.239.20810.3.239.208
8210.3.239.209/3210.3.239.209 – 10.3.239.20910.3.239.209
8310.3.239.210/3210.3.239.210 – 10.3.239.21010.3.239.210
8410.3.239.211/3210.3.239.211 – 10.3.239.21110.3.239.211
8510.3.239.212/3210.3.239.212 – 10.3.239.21210.3.239.212
8610.3.239.213/3210.3.239.213 – 10.3.239.21310.3.239.213
8710.3.239.214/3210.3.239.214 – 10.3.239.21410.3.239.214
8810.3.239.215/3210.3.239.215 – 10.3.239.21510.3.239.215
8910.3.239.216/3210.3.239.216 – 10.3.239.21610.3.239.216
9010.3.239.217/3210.3.239.217 – 10.3.239.21710.3.239.217
9110.3.239.218/3210.3.239.218 – 10.3.239.21810.3.239.218
9210.3.239.219/3210.3.239.219 – 10.3.239.21910.3.239.219
9310.3.239.220/3210.3.239.220 – 10.3.239.22010.3.239.220
9410.3.239.221/3210.3.239.221 – 10.3.239.22110.3.239.221
9510.3.239.222/3210.3.239.222 – 10.3.239.22210.3.239.222
9610.3.239.223/3210.3.239.223 – 10.3.239.22310.3.239.223
9710.3.239.224/3210.3.239.224 – 10.3.239.22410.3.239.224
9810.3.239.225/3210.3.239.225 – 10.3.239.22510.3.239.225
9910.3.239.226/3210.3.239.226 – 10.3.239.22610.3.239.226
10010.3.239.227/3210.3.239.227 – 10.3.239.22710.3.239.227
10110.3.239.228/3210.3.239.228 – 10.3.239.22810.3.239.228
10210.3.239.229/3210.3.239.229 – 10.3.239.22910.3.239.229
10310.3.239.230/3210.3.239.230 – 10.3.239.23010.3.239.230
10410.3.239.231/3210.3.239.231 – 10.3.239.23110.3.239.231
10510.3.239.232/3210.3.239.232 – 10.3.239.23210.3.239.232
10610.3.239.233/3210.3.239.233 – 10.3.239.23310.3.239.233
10710.3.239.234/3210.3.239.234 – 10.3.239.23410.3.239.234
10810.3.239.235/3210.3.239.235 – 10.3.239.23510.3.239.235
10910.3.239.236/3210.3.239.236 – 10.3.239.23610.3.239.236
11010.3.239.237/3210.3.239.237 – 10.3.239.23710.3.239.237
11110.3.239.238/3210.3.239.238 – 10.3.239.23810.3.239.238
11210.3.239.239/3210.3.239.239 – 10.3.239.23910.3.239.239
11310.3.239.240/3210.3.239.240 – 10.3.239.24010.3.239.240
11410.3.239.241/3210.3.239.241 – 10.3.239.24110.3.239.241
11510.3.239.242/3210.3.239.242 – 10.3.239.24210.3.239.242
11610.3.239.243/3210.3.239.243 – 10.3.239.24310.3.239.243
11710.3.239.244/3210.3.239.244 – 10.3.239.24410.3.239.244
11810.3.239.245/3210.3.239.245 – 10.3.239.24510.3.239.245
11910.3.239.246/3210.3.239.246 – 10.3.239.24610.3.239.246
12010.3.239.247/3210.3.239.247 – 10.3.239.24710.3.239.247
12110.3.239.248/3210.3.239.248 – 10.3.239.24810.3.239.248
12210.3.239.249/3210.3.239.249 – 10.3.239.24910.3.239.249
12310.3.239.250/3210.3.239.250 – 10.3.239.25010.3.239.250
12410.3.239.251/3210.3.239.251 – 10.3.239.25110.3.239.251
12510.3.239.252/3210.3.239.252 – 10.3.239.25210.3.239.252
12610.3.239.253/3210.3.239.253 – 10.3.239.25310.3.239.253
12710.3.239.254/3210.3.239.254 – 10.3.239.25410.3.239.254
12810.3.239.255/3210.3.239.255 – 10.3.239.25510.3.239.255
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 →