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)10.2.56.128/25
network10.2.56.128/25
broadcast10.2.56.255
first host10.2.56.129
last host10.2.56.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.56.128/25
address00001010.00000010.00111000.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.00111000.10000000
broadcast00001010.00000010.00111000.11111111
green = network part, grey = host part
hex0x0a023880
decimal167917696
reverse dns128.56.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:3880

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.2.56.128/3210.2.56.128 – 10.2.56.12810.2.56.128
210.2.56.129/3210.2.56.129 – 10.2.56.12910.2.56.129
310.2.56.130/3210.2.56.130 – 10.2.56.13010.2.56.130
410.2.56.131/3210.2.56.131 – 10.2.56.13110.2.56.131
510.2.56.132/3210.2.56.132 – 10.2.56.13210.2.56.132
610.2.56.133/3210.2.56.133 – 10.2.56.13310.2.56.133
710.2.56.134/3210.2.56.134 – 10.2.56.13410.2.56.134
810.2.56.135/3210.2.56.135 – 10.2.56.13510.2.56.135
910.2.56.136/3210.2.56.136 – 10.2.56.13610.2.56.136
1010.2.56.137/3210.2.56.137 – 10.2.56.13710.2.56.137
1110.2.56.138/3210.2.56.138 – 10.2.56.13810.2.56.138
1210.2.56.139/3210.2.56.139 – 10.2.56.13910.2.56.139
1310.2.56.140/3210.2.56.140 – 10.2.56.14010.2.56.140
1410.2.56.141/3210.2.56.141 – 10.2.56.14110.2.56.141
1510.2.56.142/3210.2.56.142 – 10.2.56.14210.2.56.142
1610.2.56.143/3210.2.56.143 – 10.2.56.14310.2.56.143
1710.2.56.144/3210.2.56.144 – 10.2.56.14410.2.56.144
1810.2.56.145/3210.2.56.145 – 10.2.56.14510.2.56.145
1910.2.56.146/3210.2.56.146 – 10.2.56.14610.2.56.146
2010.2.56.147/3210.2.56.147 – 10.2.56.14710.2.56.147
2110.2.56.148/3210.2.56.148 – 10.2.56.14810.2.56.148
2210.2.56.149/3210.2.56.149 – 10.2.56.14910.2.56.149
2310.2.56.150/3210.2.56.150 – 10.2.56.15010.2.56.150
2410.2.56.151/3210.2.56.151 – 10.2.56.15110.2.56.151
2510.2.56.152/3210.2.56.152 – 10.2.56.15210.2.56.152
2610.2.56.153/3210.2.56.153 – 10.2.56.15310.2.56.153
2710.2.56.154/3210.2.56.154 – 10.2.56.15410.2.56.154
2810.2.56.155/3210.2.56.155 – 10.2.56.15510.2.56.155
2910.2.56.156/3210.2.56.156 – 10.2.56.15610.2.56.156
3010.2.56.157/3210.2.56.157 – 10.2.56.15710.2.56.157
3110.2.56.158/3210.2.56.158 – 10.2.56.15810.2.56.158
3210.2.56.159/3210.2.56.159 – 10.2.56.15910.2.56.159
3310.2.56.160/3210.2.56.160 – 10.2.56.16010.2.56.160
3410.2.56.161/3210.2.56.161 – 10.2.56.16110.2.56.161
3510.2.56.162/3210.2.56.162 – 10.2.56.16210.2.56.162
3610.2.56.163/3210.2.56.163 – 10.2.56.16310.2.56.163
3710.2.56.164/3210.2.56.164 – 10.2.56.16410.2.56.164
3810.2.56.165/3210.2.56.165 – 10.2.56.16510.2.56.165
3910.2.56.166/3210.2.56.166 – 10.2.56.16610.2.56.166
4010.2.56.167/3210.2.56.167 – 10.2.56.16710.2.56.167
4110.2.56.168/3210.2.56.168 – 10.2.56.16810.2.56.168
4210.2.56.169/3210.2.56.169 – 10.2.56.16910.2.56.169
4310.2.56.170/3210.2.56.170 – 10.2.56.17010.2.56.170
4410.2.56.171/3210.2.56.171 – 10.2.56.17110.2.56.171
4510.2.56.172/3210.2.56.172 – 10.2.56.17210.2.56.172
4610.2.56.173/3210.2.56.173 – 10.2.56.17310.2.56.173
4710.2.56.174/3210.2.56.174 – 10.2.56.17410.2.56.174
4810.2.56.175/3210.2.56.175 – 10.2.56.17510.2.56.175
4910.2.56.176/3210.2.56.176 – 10.2.56.17610.2.56.176
5010.2.56.177/3210.2.56.177 – 10.2.56.17710.2.56.177
5110.2.56.178/3210.2.56.178 – 10.2.56.17810.2.56.178
5210.2.56.179/3210.2.56.179 – 10.2.56.17910.2.56.179
5310.2.56.180/3210.2.56.180 – 10.2.56.18010.2.56.180
5410.2.56.181/3210.2.56.181 – 10.2.56.18110.2.56.181
5510.2.56.182/3210.2.56.182 – 10.2.56.18210.2.56.182
5610.2.56.183/3210.2.56.183 – 10.2.56.18310.2.56.183
5710.2.56.184/3210.2.56.184 – 10.2.56.18410.2.56.184
5810.2.56.185/3210.2.56.185 – 10.2.56.18510.2.56.185
5910.2.56.186/3210.2.56.186 – 10.2.56.18610.2.56.186
6010.2.56.187/3210.2.56.187 – 10.2.56.18710.2.56.187
6110.2.56.188/3210.2.56.188 – 10.2.56.18810.2.56.188
6210.2.56.189/3210.2.56.189 – 10.2.56.18910.2.56.189
6310.2.56.190/3210.2.56.190 – 10.2.56.19010.2.56.190
6410.2.56.191/3210.2.56.191 – 10.2.56.19110.2.56.191
6510.2.56.192/3210.2.56.192 – 10.2.56.19210.2.56.192
6610.2.56.193/3210.2.56.193 – 10.2.56.19310.2.56.193
6710.2.56.194/3210.2.56.194 – 10.2.56.19410.2.56.194
6810.2.56.195/3210.2.56.195 – 10.2.56.19510.2.56.195
6910.2.56.196/3210.2.56.196 – 10.2.56.19610.2.56.196
7010.2.56.197/3210.2.56.197 – 10.2.56.19710.2.56.197
7110.2.56.198/3210.2.56.198 – 10.2.56.19810.2.56.198
7210.2.56.199/3210.2.56.199 – 10.2.56.19910.2.56.199
7310.2.56.200/3210.2.56.200 – 10.2.56.20010.2.56.200
7410.2.56.201/3210.2.56.201 – 10.2.56.20110.2.56.201
7510.2.56.202/3210.2.56.202 – 10.2.56.20210.2.56.202
7610.2.56.203/3210.2.56.203 – 10.2.56.20310.2.56.203
7710.2.56.204/3210.2.56.204 – 10.2.56.20410.2.56.204
7810.2.56.205/3210.2.56.205 – 10.2.56.20510.2.56.205
7910.2.56.206/3210.2.56.206 – 10.2.56.20610.2.56.206
8010.2.56.207/3210.2.56.207 – 10.2.56.20710.2.56.207
8110.2.56.208/3210.2.56.208 – 10.2.56.20810.2.56.208
8210.2.56.209/3210.2.56.209 – 10.2.56.20910.2.56.209
8310.2.56.210/3210.2.56.210 – 10.2.56.21010.2.56.210
8410.2.56.211/3210.2.56.211 – 10.2.56.21110.2.56.211
8510.2.56.212/3210.2.56.212 – 10.2.56.21210.2.56.212
8610.2.56.213/3210.2.56.213 – 10.2.56.21310.2.56.213
8710.2.56.214/3210.2.56.214 – 10.2.56.21410.2.56.214
8810.2.56.215/3210.2.56.215 – 10.2.56.21510.2.56.215
8910.2.56.216/3210.2.56.216 – 10.2.56.21610.2.56.216
9010.2.56.217/3210.2.56.217 – 10.2.56.21710.2.56.217
9110.2.56.218/3210.2.56.218 – 10.2.56.21810.2.56.218
9210.2.56.219/3210.2.56.219 – 10.2.56.21910.2.56.219
9310.2.56.220/3210.2.56.220 – 10.2.56.22010.2.56.220
9410.2.56.221/3210.2.56.221 – 10.2.56.22110.2.56.221
9510.2.56.222/3210.2.56.222 – 10.2.56.22210.2.56.222
9610.2.56.223/3210.2.56.223 – 10.2.56.22310.2.56.223
9710.2.56.224/3210.2.56.224 – 10.2.56.22410.2.56.224
9810.2.56.225/3210.2.56.225 – 10.2.56.22510.2.56.225
9910.2.56.226/3210.2.56.226 – 10.2.56.22610.2.56.226
10010.2.56.227/3210.2.56.227 – 10.2.56.22710.2.56.227
10110.2.56.228/3210.2.56.228 – 10.2.56.22810.2.56.228
10210.2.56.229/3210.2.56.229 – 10.2.56.22910.2.56.229
10310.2.56.230/3210.2.56.230 – 10.2.56.23010.2.56.230
10410.2.56.231/3210.2.56.231 – 10.2.56.23110.2.56.231
10510.2.56.232/3210.2.56.232 – 10.2.56.23210.2.56.232
10610.2.56.233/3210.2.56.233 – 10.2.56.23310.2.56.233
10710.2.56.234/3210.2.56.234 – 10.2.56.23410.2.56.234
10810.2.56.235/3210.2.56.235 – 10.2.56.23510.2.56.235
10910.2.56.236/3210.2.56.236 – 10.2.56.23610.2.56.236
11010.2.56.237/3210.2.56.237 – 10.2.56.23710.2.56.237
11110.2.56.238/3210.2.56.238 – 10.2.56.23810.2.56.238
11210.2.56.239/3210.2.56.239 – 10.2.56.23910.2.56.239
11310.2.56.240/3210.2.56.240 – 10.2.56.24010.2.56.240
11410.2.56.241/3210.2.56.241 – 10.2.56.24110.2.56.241
11510.2.56.242/3210.2.56.242 – 10.2.56.24210.2.56.242
11610.2.56.243/3210.2.56.243 – 10.2.56.24310.2.56.243
11710.2.56.244/3210.2.56.244 – 10.2.56.24410.2.56.244
11810.2.56.245/3210.2.56.245 – 10.2.56.24510.2.56.245
11910.2.56.246/3210.2.56.246 – 10.2.56.24610.2.56.246
12010.2.56.247/3210.2.56.247 – 10.2.56.24710.2.56.247
12110.2.56.248/3210.2.56.248 – 10.2.56.24810.2.56.248
12210.2.56.249/3210.2.56.249 – 10.2.56.24910.2.56.249
12310.2.56.250/3210.2.56.250 – 10.2.56.25010.2.56.250
12410.2.56.251/3210.2.56.251 – 10.2.56.25110.2.56.251
12510.2.56.252/3210.2.56.252 – 10.2.56.25210.2.56.252
12610.2.56.253/3210.2.56.253 – 10.2.56.25310.2.56.253
12710.2.56.254/3210.2.56.254 – 10.2.56.25410.2.56.254
12810.2.56.255/3210.2.56.255 – 10.2.56.25510.2.56.255
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 →