Find IP IPv4 Network/Subnet and its host address ranges

What is an IPv4 IP address its network and host address ranges?

An IPv4 IP address is an address used in order to uniquely identify a device on an IP network. The address is made up of 32 binary bits, which can be divisible into a network portion and host portion with the help of a subnet mask. The 32 binary bits are broken into four octets (1 octet = 8 bits). Each octet is converted to decimal and separated by a period (dot).

How to Subnet IPv4? Its simple answer is that subnetting is the process of taking a network and splitting it into smaller networks, known as subnets. It's used to free up more public IPv4 addresses and segment networks for security and easier management.
Following are the ranges of IPv4 subnet/network address and their host addresses.

IPv4 AddressIPv6 Address
65.121.66.1 0:0:0:0:0:ffff:4179:4201
65.121.66.2 0:0:0:0:0:ffff:4179:4202
65.121.66.3 0:0:0:0:0:ffff:4179:4203
65.121.66.4 0:0:0:0:0:ffff:4179:4204
65.121.66.5 0:0:0:0:0:ffff:4179:4205
65.121.66.6 0:0:0:0:0:ffff:4179:4206
65.121.66.7 0:0:0:0:0:ffff:4179:4207
65.121.66.8 0:0:0:0:0:ffff:4179:4208
65.121.66.9 0:0:0:0:0:ffff:4179:4209
65.121.66.10 0:0:0:0:0:ffff:4179:420a
65.121.66.11 0:0:0:0:0:ffff:4179:420b
65.121.66.12 0:0:0:0:0:ffff:4179:420c
65.121.66.13 0:0:0:0:0:ffff:4179:420d
65.121.66.14 0:0:0:0:0:ffff:4179:420e
65.121.66.15 0:0:0:0:0:ffff:4179:420f
65.121.66.16 0:0:0:0:0:ffff:4179:4210
65.121.66.17 0:0:0:0:0:ffff:4179:4211
65.121.66.18 0:0:0:0:0:ffff:4179:4212
65.121.66.19 0:0:0:0:0:ffff:4179:4213
65.121.66.20 0:0:0:0:0:ffff:4179:4214
65.121.66.21 0:0:0:0:0:ffff:4179:4215
65.121.66.22 0:0:0:0:0:ffff:4179:4216
65.121.66.23 0:0:0:0:0:ffff:4179:4217
65.121.66.24 0:0:0:0:0:ffff:4179:4218
65.121.66.25 0:0:0:0:0:ffff:4179:4219
65.121.66.26 0:0:0:0:0:ffff:4179:421a
65.121.66.27 0:0:0:0:0:ffff:4179:421b
65.121.66.28 0:0:0:0:0:ffff:4179:421c
65.121.66.29 0:0:0:0:0:ffff:4179:421d
65.121.66.30 0:0:0:0:0:ffff:4179:421e
65.121.66.31 0:0:0:0:0:ffff:4179:421f
65.121.66.32 0:0:0:0:0:ffff:4179:4220
65.121.66.33 0:0:0:0:0:ffff:4179:4221
65.121.66.34 0:0:0:0:0:ffff:4179:4222
65.121.66.35 0:0:0:0:0:ffff:4179:4223
65.121.66.36 0:0:0:0:0:ffff:4179:4224
65.121.66.37 0:0:0:0:0:ffff:4179:4225
65.121.66.38 0:0:0:0:0:ffff:4179:4226
65.121.66.39 0:0:0:0:0:ffff:4179:4227
65.121.66.40 0:0:0:0:0:ffff:4179:4228
65.121.66.41 0:0:0:0:0:ffff:4179:4229
65.121.66.42 0:0:0:0:0:ffff:4179:422a
65.121.66.43 0:0:0:0:0:ffff:4179:422b
65.121.66.44 0:0:0:0:0:ffff:4179:422c
65.121.66.45 0:0:0:0:0:ffff:4179:422d
65.121.66.46 0:0:0:0:0:ffff:4179:422e
65.121.66.47 0:0:0:0:0:ffff:4179:422f
65.121.66.48 0:0:0:0:0:ffff:4179:4230
65.121.66.49 0:0:0:0:0:ffff:4179:4231
65.121.66.50 0:0:0:0:0:ffff:4179:4232
65.121.66.51 0:0:0:0:0:ffff:4179:4233
65.121.66.52 0:0:0:0:0:ffff:4179:4234
65.121.66.53 0:0:0:0:0:ffff:4179:4235
65.121.66.54 0:0:0:0:0:ffff:4179:4236
65.121.66.55 0:0:0:0:0:ffff:4179:4237
65.121.66.56 0:0:0:0:0:ffff:4179:4238
65.121.66.57 0:0:0:0:0:ffff:4179:4239
65.121.66.58 0:0:0:0:0:ffff:4179:423a
65.121.66.59 0:0:0:0:0:ffff:4179:423b
65.121.66.60 0:0:0:0:0:ffff:4179:423c


65.121.66.61 0:0:0:0:0:ffff:4179:423d
65.121.66.62 0:0:0:0:0:ffff:4179:423e
65.121.66.63 0:0:0:0:0:ffff:4179:423f
65.121.66.64 0:0:0:0:0:ffff:4179:4240
65.121.66.65 0:0:0:0:0:ffff:4179:4241
65.121.66.66 0:0:0:0:0:ffff:4179:4242
65.121.66.67 0:0:0:0:0:ffff:4179:4243
65.121.66.68 0:0:0:0:0:ffff:4179:4244
65.121.66.69 0:0:0:0:0:ffff:4179:4245
65.121.66.70 0:0:0:0:0:ffff:4179:4246
65.121.66.71 0:0:0:0:0:ffff:4179:4247
65.121.66.72 0:0:0:0:0:ffff:4179:4248
65.121.66.73 0:0:0:0:0:ffff:4179:4249
65.121.66.74 0:0:0:0:0:ffff:4179:424a
65.121.66.75 0:0:0:0:0:ffff:4179:424b
65.121.66.76 0:0:0:0:0:ffff:4179:424c
65.121.66.77 0:0:0:0:0:ffff:4179:424d
65.121.66.78 0:0:0:0:0:ffff:4179:424e
65.121.66.79 0:0:0:0:0:ffff:4179:424f
65.121.66.80 0:0:0:0:0:ffff:4179:4250
65.121.66.81 0:0:0:0:0:ffff:4179:4251
65.121.66.82 0:0:0:0:0:ffff:4179:4252
65.121.66.83 0:0:0:0:0:ffff:4179:4253
65.121.66.84 0:0:0:0:0:ffff:4179:4254
65.121.66.85 0:0:0:0:0:ffff:4179:4255
65.121.66.86 0:0:0:0:0:ffff:4179:4256
65.121.66.87 0:0:0:0:0:ffff:4179:4257
65.121.66.88 0:0:0:0:0:ffff:4179:4258
65.121.66.89 0:0:0:0:0:ffff:4179:4259
65.121.66.90 0:0:0:0:0:ffff:4179:425a
65.121.66.91 0:0:0:0:0:ffff:4179:425b
65.121.66.92 0:0:0:0:0:ffff:4179:425c
65.121.66.93 0:0:0:0:0:ffff:4179:425d
65.121.66.94 0:0:0:0:0:ffff:4179:425e
65.121.66.95 0:0:0:0:0:ffff:4179:425f
65.121.66.96 0:0:0:0:0:ffff:4179:4260
65.121.66.97 0:0:0:0:0:ffff:4179:4261
65.121.66.98 0:0:0:0:0:ffff:4179:4262
65.121.66.99 0:0:0:0:0:ffff:4179:4263
65.121.66.100 0:0:0:0:0:ffff:4179:4264
65.121.66.101 0:0:0:0:0:ffff:4179:4265
65.121.66.102 0:0:0:0:0:ffff:4179:4266
65.121.66.103 0:0:0:0:0:ffff:4179:4267
65.121.66.104 0:0:0:0:0:ffff:4179:4268
65.121.66.105 0:0:0:0:0:ffff:4179:4269
65.121.66.106 0:0:0:0:0:ffff:4179:426a
65.121.66.107 0:0:0:0:0:ffff:4179:426b
65.121.66.108 0:0:0:0:0:ffff:4179:426c
65.121.66.109 0:0:0:0:0:ffff:4179:426d
65.121.66.110 0:0:0:0:0:ffff:4179:426e
65.121.66.111 0:0:0:0:0:ffff:4179:426f
65.121.66.112 0:0:0:0:0:ffff:4179:4270
65.121.66.113 0:0:0:0:0:ffff:4179:4271
65.121.66.114 0:0:0:0:0:ffff:4179:4272
65.121.66.115 0:0:0:0:0:ffff:4179:4273
65.121.66.116 0:0:0:0:0:ffff:4179:4274
65.121.66.117 0:0:0:0:0:ffff:4179:4275
65.121.66.118 0:0:0:0:0:ffff:4179:4276
65.121.66.119 0:0:0:0:0:ffff:4179:4277
65.121.66.120 0:0:0:0:0:ffff:4179:4278


65.121.66.121 0:0:0:0:0:ffff:4179:4279
65.121.66.122 0:0:0:0:0:ffff:4179:427a
65.121.66.123 0:0:0:0:0:ffff:4179:427b
65.121.66.124 0:0:0:0:0:ffff:4179:427c
65.121.66.125 0:0:0:0:0:ffff:4179:427d
65.121.66.126 0:0:0:0:0:ffff:4179:427e
65.121.66.127 0:0:0:0:0:ffff:4179:427f
65.121.66.128 0:0:0:0:0:ffff:4179:4280
65.121.66.129 0:0:0:0:0:ffff:4179:4281
65.121.66.130 0:0:0:0:0:ffff:4179:4282
65.121.66.131 0:0:0:0:0:ffff:4179:4283
65.121.66.132 0:0:0:0:0:ffff:4179:4284
65.121.66.133 0:0:0:0:0:ffff:4179:4285
65.121.66.134 0:0:0:0:0:ffff:4179:4286
65.121.66.135 0:0:0:0:0:ffff:4179:4287
65.121.66.136 0:0:0:0:0:ffff:4179:4288
65.121.66.137 0:0:0:0:0:ffff:4179:4289
65.121.66.138 0:0:0:0:0:ffff:4179:428a
65.121.66.139 0:0:0:0:0:ffff:4179:428b
65.121.66.140 0:0:0:0:0:ffff:4179:428c
65.121.66.141 0:0:0:0:0:ffff:4179:428d
65.121.66.142 0:0:0:0:0:ffff:4179:428e
65.121.66.143 0:0:0:0:0:ffff:4179:428f
65.121.66.144 0:0:0:0:0:ffff:4179:4290
65.121.66.145 0:0:0:0:0:ffff:4179:4291
65.121.66.146 0:0:0:0:0:ffff:4179:4292
65.121.66.147 0:0:0:0:0:ffff:4179:4293
65.121.66.148 0:0:0:0:0:ffff:4179:4294
65.121.66.149 0:0:0:0:0:ffff:4179:4295
65.121.66.150 0:0:0:0:0:ffff:4179:4296
65.121.66.151 0:0:0:0:0:ffff:4179:4297
65.121.66.152 0:0:0:0:0:ffff:4179:4298
65.121.66.153 0:0:0:0:0:ffff:4179:4299
65.121.66.154 0:0:0:0:0:ffff:4179:429a
65.121.66.155 0:0:0:0:0:ffff:4179:429b
65.121.66.156 0:0:0:0:0:ffff:4179:429c
65.121.66.157 0:0:0:0:0:ffff:4179:429d
65.121.66.158 0:0:0:0:0:ffff:4179:429e
65.121.66.159 0:0:0:0:0:ffff:4179:429f
65.121.66.160 0:0:0:0:0:ffff:4179:42a0
65.121.66.161 0:0:0:0:0:ffff:4179:42a1
65.121.66.162 0:0:0:0:0:ffff:4179:42a2
65.121.66.163 0:0:0:0:0:ffff:4179:42a3
65.121.66.164 0:0:0:0:0:ffff:4179:42a4
65.121.66.165 0:0:0:0:0:ffff:4179:42a5
65.121.66.166 0:0:0:0:0:ffff:4179:42a6
65.121.66.167 0:0:0:0:0:ffff:4179:42a7
65.121.66.168 0:0:0:0:0:ffff:4179:42a8
65.121.66.169 0:0:0:0:0:ffff:4179:42a9
65.121.66.170 0:0:0:0:0:ffff:4179:42aa
65.121.66.171 0:0:0:0:0:ffff:4179:42ab
65.121.66.172 0:0:0:0:0:ffff:4179:42ac
65.121.66.173 0:0:0:0:0:ffff:4179:42ad
65.121.66.174 0:0:0:0:0:ffff:4179:42ae
65.121.66.175 0:0:0:0:0:ffff:4179:42af
65.121.66.176 0:0:0:0:0:ffff:4179:42b0
65.121.66.177 0:0:0:0:0:ffff:4179:42b1
65.121.66.178 0:0:0:0:0:ffff:4179:42b2
65.121.66.179 0:0:0:0:0:ffff:4179:42b3
65.121.66.180 0:0:0:0:0:ffff:4179:42b4


65.121.66.181 0:0:0:0:0:ffff:4179:42b5
65.121.66.182 0:0:0:0:0:ffff:4179:42b6
65.121.66.183 0:0:0:0:0:ffff:4179:42b7
65.121.66.184 0:0:0:0:0:ffff:4179:42b8
65.121.66.185 0:0:0:0:0:ffff:4179:42b9
65.121.66.186 0:0:0:0:0:ffff:4179:42ba
65.121.66.187 0:0:0:0:0:ffff:4179:42bb
65.121.66.188 0:0:0:0:0:ffff:4179:42bc
65.121.66.189 0:0:0:0:0:ffff:4179:42bd
65.121.66.190 0:0:0:0:0:ffff:4179:42be
65.121.66.191 0:0:0:0:0:ffff:4179:42bf
65.121.66.192 0:0:0:0:0:ffff:4179:42c0
65.121.66.193 0:0:0:0:0:ffff:4179:42c1
65.121.66.194 0:0:0:0:0:ffff:4179:42c2
65.121.66.195 0:0:0:0:0:ffff:4179:42c3
65.121.66.196 0:0:0:0:0:ffff:4179:42c4
65.121.66.197 0:0:0:0:0:ffff:4179:42c5
65.121.66.198 0:0:0:0:0:ffff:4179:42c6
65.121.66.199 0:0:0:0:0:ffff:4179:42c7
65.121.66.200 0:0:0:0:0:ffff:4179:42c8
65.121.66.201 0:0:0:0:0:ffff:4179:42c9
65.121.66.202 0:0:0:0:0:ffff:4179:42ca
65.121.66.203 0:0:0:0:0:ffff:4179:42cb
65.121.66.204 0:0:0:0:0:ffff:4179:42cc
65.121.66.205 0:0:0:0:0:ffff:4179:42cd
65.121.66.206 0:0:0:0:0:ffff:4179:42ce
65.121.66.207 0:0:0:0:0:ffff:4179:42cf
65.121.66.208 0:0:0:0:0:ffff:4179:42d0
65.121.66.209 0:0:0:0:0:ffff:4179:42d1
65.121.66.210 0:0:0:0:0:ffff:4179:42d2
65.121.66.211 0:0:0:0:0:ffff:4179:42d3
65.121.66.212 0:0:0:0:0:ffff:4179:42d4
65.121.66.213 0:0:0:0:0:ffff:4179:42d5
65.121.66.214 0:0:0:0:0:ffff:4179:42d6
65.121.66.215 0:0:0:0:0:ffff:4179:42d7
65.121.66.216 0:0:0:0:0:ffff:4179:42d8
65.121.66.217 0:0:0:0:0:ffff:4179:42d9
65.121.66.218 0:0:0:0:0:ffff:4179:42da
65.121.66.219 0:0:0:0:0:ffff:4179:42db
65.121.66.220 0:0:0:0:0:ffff:4179:42dc
65.121.66.221 0:0:0:0:0:ffff:4179:42dd
65.121.66.222 0:0:0:0:0:ffff:4179:42de
65.121.66.223 0:0:0:0:0:ffff:4179:42df
65.121.66.224 0:0:0:0:0:ffff:4179:42e0
65.121.66.225 0:0:0:0:0:ffff:4179:42e1
65.121.66.226 0:0:0:0:0:ffff:4179:42e2
65.121.66.227 0:0:0:0:0:ffff:4179:42e3
65.121.66.228 0:0:0:0:0:ffff:4179:42e4
65.121.66.229 0:0:0:0:0:ffff:4179:42e5
65.121.66.230 0:0:0:0:0:ffff:4179:42e6
65.121.66.231 0:0:0:0:0:ffff:4179:42e7
65.121.66.232 0:0:0:0:0:ffff:4179:42e8
65.121.66.233 0:0:0:0:0:ffff:4179:42e9
65.121.66.234 0:0:0:0:0:ffff:4179:42ea
65.121.66.235 0:0:0:0:0:ffff:4179:42eb
65.121.66.236 0:0:0:0:0:ffff:4179:42ec
65.121.66.237 0:0:0:0:0:ffff:4179:42ed
65.121.66.238 0:0:0:0:0:ffff:4179:42ee
65.121.66.239 0:0:0:0:0:ffff:4179:42ef
65.121.66.240 0:0:0:0:0:ffff:4179:42f0
65.121.66.241 0:0:0:0:0:ffff:4179:42f1
65.121.66.242 0:0:0:0:0:ffff:4179:42f2
65.121.66.243 0:0:0:0:0:ffff:4179:42f3
65.121.66.244 0:0:0:0:0:ffff:4179:42f4
65.121.66.245 0:0:0:0:0:ffff:4179:42f5
65.121.66.246 0:0:0:0:0:ffff:4179:42f6
65.121.66.247 0:0:0:0:0:ffff:4179:42f7
65.121.66.248 0:0:0:0:0:ffff:4179:42f8
65.121.66.249 0:0:0:0:0:ffff:4179:42f9
65.121.66.250 0:0:0:0:0:ffff:4179:42fa
65.121.66.251 0:0:0:0:0:ffff:4179:42fb
65.121.66.252 0:0:0:0:0:ffff:4179:42fc
65.121.66.253 0:0:0:0:0:ffff:4179:42fd
65.121.66.254 0:0:0:0:0:ffff:4179:42fe
65.121.66.255 0:0:0:0:0:ffff:4179:42ff


How we got IPv4 subnet masks?

An IPv4 subnet mask consists of 32 bits; it is a sequence of ones (1) followed by a block of zeros (0). The ones indicate bits in the address used for the network prefix and the trailing block of zeros designates that part as being the host identifier.