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)10.0.31.128/25
network10.0.31.128/25
broadcast10.0.31.255
first host10.0.31.129
last host10.0.31.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.0.31.128/25
address00001010.00000000.00011111.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000000.00011111.10000000
broadcast00001010.00000000.00011111.11111111
green = network part, grey = host part
hex0x0a001f80
decimal167780224
reverse dns128.31.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:1f80

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.0.31.128/3210.0.31.128 – 10.0.31.12810.0.31.128
210.0.31.129/3210.0.31.129 – 10.0.31.12910.0.31.129
310.0.31.130/3210.0.31.130 – 10.0.31.13010.0.31.130
410.0.31.131/3210.0.31.131 – 10.0.31.13110.0.31.131
510.0.31.132/3210.0.31.132 – 10.0.31.13210.0.31.132
610.0.31.133/3210.0.31.133 – 10.0.31.13310.0.31.133
710.0.31.134/3210.0.31.134 – 10.0.31.13410.0.31.134
810.0.31.135/3210.0.31.135 – 10.0.31.13510.0.31.135
910.0.31.136/3210.0.31.136 – 10.0.31.13610.0.31.136
1010.0.31.137/3210.0.31.137 – 10.0.31.13710.0.31.137
1110.0.31.138/3210.0.31.138 – 10.0.31.13810.0.31.138
1210.0.31.139/3210.0.31.139 – 10.0.31.13910.0.31.139
1310.0.31.140/3210.0.31.140 – 10.0.31.14010.0.31.140
1410.0.31.141/3210.0.31.141 – 10.0.31.14110.0.31.141
1510.0.31.142/3210.0.31.142 – 10.0.31.14210.0.31.142
1610.0.31.143/3210.0.31.143 – 10.0.31.14310.0.31.143
1710.0.31.144/3210.0.31.144 – 10.0.31.14410.0.31.144
1810.0.31.145/3210.0.31.145 – 10.0.31.14510.0.31.145
1910.0.31.146/3210.0.31.146 – 10.0.31.14610.0.31.146
2010.0.31.147/3210.0.31.147 – 10.0.31.14710.0.31.147
2110.0.31.148/3210.0.31.148 – 10.0.31.14810.0.31.148
2210.0.31.149/3210.0.31.149 – 10.0.31.14910.0.31.149
2310.0.31.150/3210.0.31.150 – 10.0.31.15010.0.31.150
2410.0.31.151/3210.0.31.151 – 10.0.31.15110.0.31.151
2510.0.31.152/3210.0.31.152 – 10.0.31.15210.0.31.152
2610.0.31.153/3210.0.31.153 – 10.0.31.15310.0.31.153
2710.0.31.154/3210.0.31.154 – 10.0.31.15410.0.31.154
2810.0.31.155/3210.0.31.155 – 10.0.31.15510.0.31.155
2910.0.31.156/3210.0.31.156 – 10.0.31.15610.0.31.156
3010.0.31.157/3210.0.31.157 – 10.0.31.15710.0.31.157
3110.0.31.158/3210.0.31.158 – 10.0.31.15810.0.31.158
3210.0.31.159/3210.0.31.159 – 10.0.31.15910.0.31.159
3310.0.31.160/3210.0.31.160 – 10.0.31.16010.0.31.160
3410.0.31.161/3210.0.31.161 – 10.0.31.16110.0.31.161
3510.0.31.162/3210.0.31.162 – 10.0.31.16210.0.31.162
3610.0.31.163/3210.0.31.163 – 10.0.31.16310.0.31.163
3710.0.31.164/3210.0.31.164 – 10.0.31.16410.0.31.164
3810.0.31.165/3210.0.31.165 – 10.0.31.16510.0.31.165
3910.0.31.166/3210.0.31.166 – 10.0.31.16610.0.31.166
4010.0.31.167/3210.0.31.167 – 10.0.31.16710.0.31.167
4110.0.31.168/3210.0.31.168 – 10.0.31.16810.0.31.168
4210.0.31.169/3210.0.31.169 – 10.0.31.16910.0.31.169
4310.0.31.170/3210.0.31.170 – 10.0.31.17010.0.31.170
4410.0.31.171/3210.0.31.171 – 10.0.31.17110.0.31.171
4510.0.31.172/3210.0.31.172 – 10.0.31.17210.0.31.172
4610.0.31.173/3210.0.31.173 – 10.0.31.17310.0.31.173
4710.0.31.174/3210.0.31.174 – 10.0.31.17410.0.31.174
4810.0.31.175/3210.0.31.175 – 10.0.31.17510.0.31.175
4910.0.31.176/3210.0.31.176 – 10.0.31.17610.0.31.176
5010.0.31.177/3210.0.31.177 – 10.0.31.17710.0.31.177
5110.0.31.178/3210.0.31.178 – 10.0.31.17810.0.31.178
5210.0.31.179/3210.0.31.179 – 10.0.31.17910.0.31.179
5310.0.31.180/3210.0.31.180 – 10.0.31.18010.0.31.180
5410.0.31.181/3210.0.31.181 – 10.0.31.18110.0.31.181
5510.0.31.182/3210.0.31.182 – 10.0.31.18210.0.31.182
5610.0.31.183/3210.0.31.183 – 10.0.31.18310.0.31.183
5710.0.31.184/3210.0.31.184 – 10.0.31.18410.0.31.184
5810.0.31.185/3210.0.31.185 – 10.0.31.18510.0.31.185
5910.0.31.186/3210.0.31.186 – 10.0.31.18610.0.31.186
6010.0.31.187/3210.0.31.187 – 10.0.31.18710.0.31.187
6110.0.31.188/3210.0.31.188 – 10.0.31.18810.0.31.188
6210.0.31.189/3210.0.31.189 – 10.0.31.18910.0.31.189
6310.0.31.190/3210.0.31.190 – 10.0.31.19010.0.31.190
6410.0.31.191/3210.0.31.191 – 10.0.31.19110.0.31.191
6510.0.31.192/3210.0.31.192 – 10.0.31.19210.0.31.192
6610.0.31.193/3210.0.31.193 – 10.0.31.19310.0.31.193
6710.0.31.194/3210.0.31.194 – 10.0.31.19410.0.31.194
6810.0.31.195/3210.0.31.195 – 10.0.31.19510.0.31.195
6910.0.31.196/3210.0.31.196 – 10.0.31.19610.0.31.196
7010.0.31.197/3210.0.31.197 – 10.0.31.19710.0.31.197
7110.0.31.198/3210.0.31.198 – 10.0.31.19810.0.31.198
7210.0.31.199/3210.0.31.199 – 10.0.31.19910.0.31.199
7310.0.31.200/3210.0.31.200 – 10.0.31.20010.0.31.200
7410.0.31.201/3210.0.31.201 – 10.0.31.20110.0.31.201
7510.0.31.202/3210.0.31.202 – 10.0.31.20210.0.31.202
7610.0.31.203/3210.0.31.203 – 10.0.31.20310.0.31.203
7710.0.31.204/3210.0.31.204 – 10.0.31.20410.0.31.204
7810.0.31.205/3210.0.31.205 – 10.0.31.20510.0.31.205
7910.0.31.206/3210.0.31.206 – 10.0.31.20610.0.31.206
8010.0.31.207/3210.0.31.207 – 10.0.31.20710.0.31.207
8110.0.31.208/3210.0.31.208 – 10.0.31.20810.0.31.208
8210.0.31.209/3210.0.31.209 – 10.0.31.20910.0.31.209
8310.0.31.210/3210.0.31.210 – 10.0.31.21010.0.31.210
8410.0.31.211/3210.0.31.211 – 10.0.31.21110.0.31.211
8510.0.31.212/3210.0.31.212 – 10.0.31.21210.0.31.212
8610.0.31.213/3210.0.31.213 – 10.0.31.21310.0.31.213
8710.0.31.214/3210.0.31.214 – 10.0.31.21410.0.31.214
8810.0.31.215/3210.0.31.215 – 10.0.31.21510.0.31.215
8910.0.31.216/3210.0.31.216 – 10.0.31.21610.0.31.216
9010.0.31.217/3210.0.31.217 – 10.0.31.21710.0.31.217
9110.0.31.218/3210.0.31.218 – 10.0.31.21810.0.31.218
9210.0.31.219/3210.0.31.219 – 10.0.31.21910.0.31.219
9310.0.31.220/3210.0.31.220 – 10.0.31.22010.0.31.220
9410.0.31.221/3210.0.31.221 – 10.0.31.22110.0.31.221
9510.0.31.222/3210.0.31.222 – 10.0.31.22210.0.31.222
9610.0.31.223/3210.0.31.223 – 10.0.31.22310.0.31.223
9710.0.31.224/3210.0.31.224 – 10.0.31.22410.0.31.224
9810.0.31.225/3210.0.31.225 – 10.0.31.22510.0.31.225
9910.0.31.226/3210.0.31.226 – 10.0.31.22610.0.31.226
10010.0.31.227/3210.0.31.227 – 10.0.31.22710.0.31.227
10110.0.31.228/3210.0.31.228 – 10.0.31.22810.0.31.228
10210.0.31.229/3210.0.31.229 – 10.0.31.22910.0.31.229
10310.0.31.230/3210.0.31.230 – 10.0.31.23010.0.31.230
10410.0.31.231/3210.0.31.231 – 10.0.31.23110.0.31.231
10510.0.31.232/3210.0.31.232 – 10.0.31.23210.0.31.232
10610.0.31.233/3210.0.31.233 – 10.0.31.23310.0.31.233
10710.0.31.234/3210.0.31.234 – 10.0.31.23410.0.31.234
10810.0.31.235/3210.0.31.235 – 10.0.31.23510.0.31.235
10910.0.31.236/3210.0.31.236 – 10.0.31.23610.0.31.236
11010.0.31.237/3210.0.31.237 – 10.0.31.23710.0.31.237
11110.0.31.238/3210.0.31.238 – 10.0.31.23810.0.31.238
11210.0.31.239/3210.0.31.239 – 10.0.31.23910.0.31.239
11310.0.31.240/3210.0.31.240 – 10.0.31.24010.0.31.240
11410.0.31.241/3210.0.31.241 – 10.0.31.24110.0.31.241
11510.0.31.242/3210.0.31.242 – 10.0.31.24210.0.31.242
11610.0.31.243/3210.0.31.243 – 10.0.31.24310.0.31.243
11710.0.31.244/3210.0.31.244 – 10.0.31.24410.0.31.244
11810.0.31.245/3210.0.31.245 – 10.0.31.24510.0.31.245
11910.0.31.246/3210.0.31.246 – 10.0.31.24610.0.31.246
12010.0.31.247/3210.0.31.247 – 10.0.31.24710.0.31.247
12110.0.31.248/3210.0.31.248 – 10.0.31.24810.0.31.248
12210.0.31.249/3210.0.31.249 – 10.0.31.24910.0.31.249
12310.0.31.250/3210.0.31.250 – 10.0.31.25010.0.31.250
12410.0.31.251/3210.0.31.251 – 10.0.31.25110.0.31.251
12510.0.31.252/3210.0.31.252 – 10.0.31.25210.0.31.252
12610.0.31.253/3210.0.31.253 – 10.0.31.25310.0.31.253
12710.0.31.254/3210.0.31.254 – 10.0.31.25410.0.31.254
12810.0.31.255/3210.0.31.255 – 10.0.31.25510.0.31.255
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 →