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)10.0.19.128/25
network10.0.19.128/25
broadcast10.0.19.255
first host10.0.19.129
last host10.0.19.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.0.19.128/25
address00001010.00000000.00010011.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000000.00010011.10000000
broadcast00001010.00000000.00010011.11111111
green = network part, grey = host part
hex0x0a001380
decimal167777152
reverse dns128.19.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:1380

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.0.19.128/3210.0.19.128 – 10.0.19.12810.0.19.128
210.0.19.129/3210.0.19.129 – 10.0.19.12910.0.19.129
310.0.19.130/3210.0.19.130 – 10.0.19.13010.0.19.130
410.0.19.131/3210.0.19.131 – 10.0.19.13110.0.19.131
510.0.19.132/3210.0.19.132 – 10.0.19.13210.0.19.132
610.0.19.133/3210.0.19.133 – 10.0.19.13310.0.19.133
710.0.19.134/3210.0.19.134 – 10.0.19.13410.0.19.134
810.0.19.135/3210.0.19.135 – 10.0.19.13510.0.19.135
910.0.19.136/3210.0.19.136 – 10.0.19.13610.0.19.136
1010.0.19.137/3210.0.19.137 – 10.0.19.13710.0.19.137
1110.0.19.138/3210.0.19.138 – 10.0.19.13810.0.19.138
1210.0.19.139/3210.0.19.139 – 10.0.19.13910.0.19.139
1310.0.19.140/3210.0.19.140 – 10.0.19.14010.0.19.140
1410.0.19.141/3210.0.19.141 – 10.0.19.14110.0.19.141
1510.0.19.142/3210.0.19.142 – 10.0.19.14210.0.19.142
1610.0.19.143/3210.0.19.143 – 10.0.19.14310.0.19.143
1710.0.19.144/3210.0.19.144 – 10.0.19.14410.0.19.144
1810.0.19.145/3210.0.19.145 – 10.0.19.14510.0.19.145
1910.0.19.146/3210.0.19.146 – 10.0.19.14610.0.19.146
2010.0.19.147/3210.0.19.147 – 10.0.19.14710.0.19.147
2110.0.19.148/3210.0.19.148 – 10.0.19.14810.0.19.148
2210.0.19.149/3210.0.19.149 – 10.0.19.14910.0.19.149
2310.0.19.150/3210.0.19.150 – 10.0.19.15010.0.19.150
2410.0.19.151/3210.0.19.151 – 10.0.19.15110.0.19.151
2510.0.19.152/3210.0.19.152 – 10.0.19.15210.0.19.152
2610.0.19.153/3210.0.19.153 – 10.0.19.15310.0.19.153
2710.0.19.154/3210.0.19.154 – 10.0.19.15410.0.19.154
2810.0.19.155/3210.0.19.155 – 10.0.19.15510.0.19.155
2910.0.19.156/3210.0.19.156 – 10.0.19.15610.0.19.156
3010.0.19.157/3210.0.19.157 – 10.0.19.15710.0.19.157
3110.0.19.158/3210.0.19.158 – 10.0.19.15810.0.19.158
3210.0.19.159/3210.0.19.159 – 10.0.19.15910.0.19.159
3310.0.19.160/3210.0.19.160 – 10.0.19.16010.0.19.160
3410.0.19.161/3210.0.19.161 – 10.0.19.16110.0.19.161
3510.0.19.162/3210.0.19.162 – 10.0.19.16210.0.19.162
3610.0.19.163/3210.0.19.163 – 10.0.19.16310.0.19.163
3710.0.19.164/3210.0.19.164 – 10.0.19.16410.0.19.164
3810.0.19.165/3210.0.19.165 – 10.0.19.16510.0.19.165
3910.0.19.166/3210.0.19.166 – 10.0.19.16610.0.19.166
4010.0.19.167/3210.0.19.167 – 10.0.19.16710.0.19.167
4110.0.19.168/3210.0.19.168 – 10.0.19.16810.0.19.168
4210.0.19.169/3210.0.19.169 – 10.0.19.16910.0.19.169
4310.0.19.170/3210.0.19.170 – 10.0.19.17010.0.19.170
4410.0.19.171/3210.0.19.171 – 10.0.19.17110.0.19.171
4510.0.19.172/3210.0.19.172 – 10.0.19.17210.0.19.172
4610.0.19.173/3210.0.19.173 – 10.0.19.17310.0.19.173
4710.0.19.174/3210.0.19.174 – 10.0.19.17410.0.19.174
4810.0.19.175/3210.0.19.175 – 10.0.19.17510.0.19.175
4910.0.19.176/3210.0.19.176 – 10.0.19.17610.0.19.176
5010.0.19.177/3210.0.19.177 – 10.0.19.17710.0.19.177
5110.0.19.178/3210.0.19.178 – 10.0.19.17810.0.19.178
5210.0.19.179/3210.0.19.179 – 10.0.19.17910.0.19.179
5310.0.19.180/3210.0.19.180 – 10.0.19.18010.0.19.180
5410.0.19.181/3210.0.19.181 – 10.0.19.18110.0.19.181
5510.0.19.182/3210.0.19.182 – 10.0.19.18210.0.19.182
5610.0.19.183/3210.0.19.183 – 10.0.19.18310.0.19.183
5710.0.19.184/3210.0.19.184 – 10.0.19.18410.0.19.184
5810.0.19.185/3210.0.19.185 – 10.0.19.18510.0.19.185
5910.0.19.186/3210.0.19.186 – 10.0.19.18610.0.19.186
6010.0.19.187/3210.0.19.187 – 10.0.19.18710.0.19.187
6110.0.19.188/3210.0.19.188 – 10.0.19.18810.0.19.188
6210.0.19.189/3210.0.19.189 – 10.0.19.18910.0.19.189
6310.0.19.190/3210.0.19.190 – 10.0.19.19010.0.19.190
6410.0.19.191/3210.0.19.191 – 10.0.19.19110.0.19.191
6510.0.19.192/3210.0.19.192 – 10.0.19.19210.0.19.192
6610.0.19.193/3210.0.19.193 – 10.0.19.19310.0.19.193
6710.0.19.194/3210.0.19.194 – 10.0.19.19410.0.19.194
6810.0.19.195/3210.0.19.195 – 10.0.19.19510.0.19.195
6910.0.19.196/3210.0.19.196 – 10.0.19.19610.0.19.196
7010.0.19.197/3210.0.19.197 – 10.0.19.19710.0.19.197
7110.0.19.198/3210.0.19.198 – 10.0.19.19810.0.19.198
7210.0.19.199/3210.0.19.199 – 10.0.19.19910.0.19.199
7310.0.19.200/3210.0.19.200 – 10.0.19.20010.0.19.200
7410.0.19.201/3210.0.19.201 – 10.0.19.20110.0.19.201
7510.0.19.202/3210.0.19.202 – 10.0.19.20210.0.19.202
7610.0.19.203/3210.0.19.203 – 10.0.19.20310.0.19.203
7710.0.19.204/3210.0.19.204 – 10.0.19.20410.0.19.204
7810.0.19.205/3210.0.19.205 – 10.0.19.20510.0.19.205
7910.0.19.206/3210.0.19.206 – 10.0.19.20610.0.19.206
8010.0.19.207/3210.0.19.207 – 10.0.19.20710.0.19.207
8110.0.19.208/3210.0.19.208 – 10.0.19.20810.0.19.208
8210.0.19.209/3210.0.19.209 – 10.0.19.20910.0.19.209
8310.0.19.210/3210.0.19.210 – 10.0.19.21010.0.19.210
8410.0.19.211/3210.0.19.211 – 10.0.19.21110.0.19.211
8510.0.19.212/3210.0.19.212 – 10.0.19.21210.0.19.212
8610.0.19.213/3210.0.19.213 – 10.0.19.21310.0.19.213
8710.0.19.214/3210.0.19.214 – 10.0.19.21410.0.19.214
8810.0.19.215/3210.0.19.215 – 10.0.19.21510.0.19.215
8910.0.19.216/3210.0.19.216 – 10.0.19.21610.0.19.216
9010.0.19.217/3210.0.19.217 – 10.0.19.21710.0.19.217
9110.0.19.218/3210.0.19.218 – 10.0.19.21810.0.19.218
9210.0.19.219/3210.0.19.219 – 10.0.19.21910.0.19.219
9310.0.19.220/3210.0.19.220 – 10.0.19.22010.0.19.220
9410.0.19.221/3210.0.19.221 – 10.0.19.22110.0.19.221
9510.0.19.222/3210.0.19.222 – 10.0.19.22210.0.19.222
9610.0.19.223/3210.0.19.223 – 10.0.19.22310.0.19.223
9710.0.19.224/3210.0.19.224 – 10.0.19.22410.0.19.224
9810.0.19.225/3210.0.19.225 – 10.0.19.22510.0.19.225
9910.0.19.226/3210.0.19.226 – 10.0.19.22610.0.19.226
10010.0.19.227/3210.0.19.227 – 10.0.19.22710.0.19.227
10110.0.19.228/3210.0.19.228 – 10.0.19.22810.0.19.228
10210.0.19.229/3210.0.19.229 – 10.0.19.22910.0.19.229
10310.0.19.230/3210.0.19.230 – 10.0.19.23010.0.19.230
10410.0.19.231/3210.0.19.231 – 10.0.19.23110.0.19.231
10510.0.19.232/3210.0.19.232 – 10.0.19.23210.0.19.232
10610.0.19.233/3210.0.19.233 – 10.0.19.23310.0.19.233
10710.0.19.234/3210.0.19.234 – 10.0.19.23410.0.19.234
10810.0.19.235/3210.0.19.235 – 10.0.19.23510.0.19.235
10910.0.19.236/3210.0.19.236 – 10.0.19.23610.0.19.236
11010.0.19.237/3210.0.19.237 – 10.0.19.23710.0.19.237
11110.0.19.238/3210.0.19.238 – 10.0.19.23810.0.19.238
11210.0.19.239/3210.0.19.239 – 10.0.19.23910.0.19.239
11310.0.19.240/3210.0.19.240 – 10.0.19.24010.0.19.240
11410.0.19.241/3210.0.19.241 – 10.0.19.24110.0.19.241
11510.0.19.242/3210.0.19.242 – 10.0.19.24210.0.19.242
11610.0.19.243/3210.0.19.243 – 10.0.19.24310.0.19.243
11710.0.19.244/3210.0.19.244 – 10.0.19.24410.0.19.244
11810.0.19.245/3210.0.19.245 – 10.0.19.24510.0.19.245
11910.0.19.246/3210.0.19.246 – 10.0.19.24610.0.19.246
12010.0.19.247/3210.0.19.247 – 10.0.19.24710.0.19.247
12110.0.19.248/3210.0.19.248 – 10.0.19.24810.0.19.248
12210.0.19.249/3210.0.19.249 – 10.0.19.24910.0.19.249
12310.0.19.250/3210.0.19.250 – 10.0.19.25010.0.19.250
12410.0.19.251/3210.0.19.251 – 10.0.19.25110.0.19.251
12510.0.19.252/3210.0.19.252 – 10.0.19.25210.0.19.252
12610.0.19.253/3210.0.19.253 – 10.0.19.25310.0.19.253
12710.0.19.254/3210.0.19.254 – 10.0.19.25410.0.19.254
12810.0.19.255/3210.0.19.255 – 10.0.19.25510.0.19.255
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 →