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)10.2.37.128/25
network10.2.37.128/25
broadcast10.2.37.255
first host10.2.37.129
last host10.2.37.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.37.128/25
address00001010.00000010.00100101.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.00100101.10000000
broadcast00001010.00000010.00100101.11111111
green = network part, grey = host part
hex0x0a022580
decimal167912832
reverse dns128.37.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:2580

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.2.37.128/3210.2.37.128 – 10.2.37.12810.2.37.128
210.2.37.129/3210.2.37.129 – 10.2.37.12910.2.37.129
310.2.37.130/3210.2.37.130 – 10.2.37.13010.2.37.130
410.2.37.131/3210.2.37.131 – 10.2.37.13110.2.37.131
510.2.37.132/3210.2.37.132 – 10.2.37.13210.2.37.132
610.2.37.133/3210.2.37.133 – 10.2.37.13310.2.37.133
710.2.37.134/3210.2.37.134 – 10.2.37.13410.2.37.134
810.2.37.135/3210.2.37.135 – 10.2.37.13510.2.37.135
910.2.37.136/3210.2.37.136 – 10.2.37.13610.2.37.136
1010.2.37.137/3210.2.37.137 – 10.2.37.13710.2.37.137
1110.2.37.138/3210.2.37.138 – 10.2.37.13810.2.37.138
1210.2.37.139/3210.2.37.139 – 10.2.37.13910.2.37.139
1310.2.37.140/3210.2.37.140 – 10.2.37.14010.2.37.140
1410.2.37.141/3210.2.37.141 – 10.2.37.14110.2.37.141
1510.2.37.142/3210.2.37.142 – 10.2.37.14210.2.37.142
1610.2.37.143/3210.2.37.143 – 10.2.37.14310.2.37.143
1710.2.37.144/3210.2.37.144 – 10.2.37.14410.2.37.144
1810.2.37.145/3210.2.37.145 – 10.2.37.14510.2.37.145
1910.2.37.146/3210.2.37.146 – 10.2.37.14610.2.37.146
2010.2.37.147/3210.2.37.147 – 10.2.37.14710.2.37.147
2110.2.37.148/3210.2.37.148 – 10.2.37.14810.2.37.148
2210.2.37.149/3210.2.37.149 – 10.2.37.14910.2.37.149
2310.2.37.150/3210.2.37.150 – 10.2.37.15010.2.37.150
2410.2.37.151/3210.2.37.151 – 10.2.37.15110.2.37.151
2510.2.37.152/3210.2.37.152 – 10.2.37.15210.2.37.152
2610.2.37.153/3210.2.37.153 – 10.2.37.15310.2.37.153
2710.2.37.154/3210.2.37.154 – 10.2.37.15410.2.37.154
2810.2.37.155/3210.2.37.155 – 10.2.37.15510.2.37.155
2910.2.37.156/3210.2.37.156 – 10.2.37.15610.2.37.156
3010.2.37.157/3210.2.37.157 – 10.2.37.15710.2.37.157
3110.2.37.158/3210.2.37.158 – 10.2.37.15810.2.37.158
3210.2.37.159/3210.2.37.159 – 10.2.37.15910.2.37.159
3310.2.37.160/3210.2.37.160 – 10.2.37.16010.2.37.160
3410.2.37.161/3210.2.37.161 – 10.2.37.16110.2.37.161
3510.2.37.162/3210.2.37.162 – 10.2.37.16210.2.37.162
3610.2.37.163/3210.2.37.163 – 10.2.37.16310.2.37.163
3710.2.37.164/3210.2.37.164 – 10.2.37.16410.2.37.164
3810.2.37.165/3210.2.37.165 – 10.2.37.16510.2.37.165
3910.2.37.166/3210.2.37.166 – 10.2.37.16610.2.37.166
4010.2.37.167/3210.2.37.167 – 10.2.37.16710.2.37.167
4110.2.37.168/3210.2.37.168 – 10.2.37.16810.2.37.168
4210.2.37.169/3210.2.37.169 – 10.2.37.16910.2.37.169
4310.2.37.170/3210.2.37.170 – 10.2.37.17010.2.37.170
4410.2.37.171/3210.2.37.171 – 10.2.37.17110.2.37.171
4510.2.37.172/3210.2.37.172 – 10.2.37.17210.2.37.172
4610.2.37.173/3210.2.37.173 – 10.2.37.17310.2.37.173
4710.2.37.174/3210.2.37.174 – 10.2.37.17410.2.37.174
4810.2.37.175/3210.2.37.175 – 10.2.37.17510.2.37.175
4910.2.37.176/3210.2.37.176 – 10.2.37.17610.2.37.176
5010.2.37.177/3210.2.37.177 – 10.2.37.17710.2.37.177
5110.2.37.178/3210.2.37.178 – 10.2.37.17810.2.37.178
5210.2.37.179/3210.2.37.179 – 10.2.37.17910.2.37.179
5310.2.37.180/3210.2.37.180 – 10.2.37.18010.2.37.180
5410.2.37.181/3210.2.37.181 – 10.2.37.18110.2.37.181
5510.2.37.182/3210.2.37.182 – 10.2.37.18210.2.37.182
5610.2.37.183/3210.2.37.183 – 10.2.37.18310.2.37.183
5710.2.37.184/3210.2.37.184 – 10.2.37.18410.2.37.184
5810.2.37.185/3210.2.37.185 – 10.2.37.18510.2.37.185
5910.2.37.186/3210.2.37.186 – 10.2.37.18610.2.37.186
6010.2.37.187/3210.2.37.187 – 10.2.37.18710.2.37.187
6110.2.37.188/3210.2.37.188 – 10.2.37.18810.2.37.188
6210.2.37.189/3210.2.37.189 – 10.2.37.18910.2.37.189
6310.2.37.190/3210.2.37.190 – 10.2.37.19010.2.37.190
6410.2.37.191/3210.2.37.191 – 10.2.37.19110.2.37.191
6510.2.37.192/3210.2.37.192 – 10.2.37.19210.2.37.192
6610.2.37.193/3210.2.37.193 – 10.2.37.19310.2.37.193
6710.2.37.194/3210.2.37.194 – 10.2.37.19410.2.37.194
6810.2.37.195/3210.2.37.195 – 10.2.37.19510.2.37.195
6910.2.37.196/3210.2.37.196 – 10.2.37.19610.2.37.196
7010.2.37.197/3210.2.37.197 – 10.2.37.19710.2.37.197
7110.2.37.198/3210.2.37.198 – 10.2.37.19810.2.37.198
7210.2.37.199/3210.2.37.199 – 10.2.37.19910.2.37.199
7310.2.37.200/3210.2.37.200 – 10.2.37.20010.2.37.200
7410.2.37.201/3210.2.37.201 – 10.2.37.20110.2.37.201
7510.2.37.202/3210.2.37.202 – 10.2.37.20210.2.37.202
7610.2.37.203/3210.2.37.203 – 10.2.37.20310.2.37.203
7710.2.37.204/3210.2.37.204 – 10.2.37.20410.2.37.204
7810.2.37.205/3210.2.37.205 – 10.2.37.20510.2.37.205
7910.2.37.206/3210.2.37.206 – 10.2.37.20610.2.37.206
8010.2.37.207/3210.2.37.207 – 10.2.37.20710.2.37.207
8110.2.37.208/3210.2.37.208 – 10.2.37.20810.2.37.208
8210.2.37.209/3210.2.37.209 – 10.2.37.20910.2.37.209
8310.2.37.210/3210.2.37.210 – 10.2.37.21010.2.37.210
8410.2.37.211/3210.2.37.211 – 10.2.37.21110.2.37.211
8510.2.37.212/3210.2.37.212 – 10.2.37.21210.2.37.212
8610.2.37.213/3210.2.37.213 – 10.2.37.21310.2.37.213
8710.2.37.214/3210.2.37.214 – 10.2.37.21410.2.37.214
8810.2.37.215/3210.2.37.215 – 10.2.37.21510.2.37.215
8910.2.37.216/3210.2.37.216 – 10.2.37.21610.2.37.216
9010.2.37.217/3210.2.37.217 – 10.2.37.21710.2.37.217
9110.2.37.218/3210.2.37.218 – 10.2.37.21810.2.37.218
9210.2.37.219/3210.2.37.219 – 10.2.37.21910.2.37.219
9310.2.37.220/3210.2.37.220 – 10.2.37.22010.2.37.220
9410.2.37.221/3210.2.37.221 – 10.2.37.22110.2.37.221
9510.2.37.222/3210.2.37.222 – 10.2.37.22210.2.37.222
9610.2.37.223/3210.2.37.223 – 10.2.37.22310.2.37.223
9710.2.37.224/3210.2.37.224 – 10.2.37.22410.2.37.224
9810.2.37.225/3210.2.37.225 – 10.2.37.22510.2.37.225
9910.2.37.226/3210.2.37.226 – 10.2.37.22610.2.37.226
10010.2.37.227/3210.2.37.227 – 10.2.37.22710.2.37.227
10110.2.37.228/3210.2.37.228 – 10.2.37.22810.2.37.228
10210.2.37.229/3210.2.37.229 – 10.2.37.22910.2.37.229
10310.2.37.230/3210.2.37.230 – 10.2.37.23010.2.37.230
10410.2.37.231/3210.2.37.231 – 10.2.37.23110.2.37.231
10510.2.37.232/3210.2.37.232 – 10.2.37.23210.2.37.232
10610.2.37.233/3210.2.37.233 – 10.2.37.23310.2.37.233
10710.2.37.234/3210.2.37.234 – 10.2.37.23410.2.37.234
10810.2.37.235/3210.2.37.235 – 10.2.37.23510.2.37.235
10910.2.37.236/3210.2.37.236 – 10.2.37.23610.2.37.236
11010.2.37.237/3210.2.37.237 – 10.2.37.23710.2.37.237
11110.2.37.238/3210.2.37.238 – 10.2.37.23810.2.37.238
11210.2.37.239/3210.2.37.239 – 10.2.37.23910.2.37.239
11310.2.37.240/3210.2.37.240 – 10.2.37.24010.2.37.240
11410.2.37.241/3210.2.37.241 – 10.2.37.24110.2.37.241
11510.2.37.242/3210.2.37.242 – 10.2.37.24210.2.37.242
11610.2.37.243/3210.2.37.243 – 10.2.37.24310.2.37.243
11710.2.37.244/3210.2.37.244 – 10.2.37.24410.2.37.244
11810.2.37.245/3210.2.37.245 – 10.2.37.24510.2.37.245
11910.2.37.246/3210.2.37.246 – 10.2.37.24610.2.37.246
12010.2.37.247/3210.2.37.247 – 10.2.37.24710.2.37.247
12110.2.37.248/3210.2.37.248 – 10.2.37.24810.2.37.248
12210.2.37.249/3210.2.37.249 – 10.2.37.24910.2.37.249
12310.2.37.250/3210.2.37.250 – 10.2.37.25010.2.37.250
12410.2.37.251/3210.2.37.251 – 10.2.37.25110.2.37.251
12510.2.37.252/3210.2.37.252 – 10.2.37.25210.2.37.252
12610.2.37.253/3210.2.37.253 – 10.2.37.25310.2.37.253
12710.2.37.254/3210.2.37.254 – 10.2.37.25410.2.37.254
12810.2.37.255/3210.2.37.255 – 10.2.37.25510.2.37.255
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 →