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
21.15.2.1 0:0:0:0:0:ffff:150f:201
21.15.2.2 0:0:0:0:0:ffff:150f:202
21.15.2.3 0:0:0:0:0:ffff:150f:203
21.15.2.4 0:0:0:0:0:ffff:150f:204
21.15.2.5 0:0:0:0:0:ffff:150f:205
21.15.2.6 0:0:0:0:0:ffff:150f:206
21.15.2.7 0:0:0:0:0:ffff:150f:207
21.15.2.8 0:0:0:0:0:ffff:150f:208
21.15.2.9 0:0:0:0:0:ffff:150f:209
21.15.2.10 0:0:0:0:0:ffff:150f:20a
21.15.2.11 0:0:0:0:0:ffff:150f:20b
21.15.2.12 0:0:0:0:0:ffff:150f:20c
21.15.2.13 0:0:0:0:0:ffff:150f:20d
21.15.2.14 0:0:0:0:0:ffff:150f:20e
21.15.2.15 0:0:0:0:0:ffff:150f:20f
21.15.2.16 0:0:0:0:0:ffff:150f:210
21.15.2.17 0:0:0:0:0:ffff:150f:211
21.15.2.18 0:0:0:0:0:ffff:150f:212
21.15.2.19 0:0:0:0:0:ffff:150f:213
21.15.2.20 0:0:0:0:0:ffff:150f:214
21.15.2.21 0:0:0:0:0:ffff:150f:215
21.15.2.22 0:0:0:0:0:ffff:150f:216
21.15.2.23 0:0:0:0:0:ffff:150f:217
21.15.2.24 0:0:0:0:0:ffff:150f:218
21.15.2.25 0:0:0:0:0:ffff:150f:219
21.15.2.26 0:0:0:0:0:ffff:150f:21a
21.15.2.27 0:0:0:0:0:ffff:150f:21b
21.15.2.28 0:0:0:0:0:ffff:150f:21c
21.15.2.29 0:0:0:0:0:ffff:150f:21d
21.15.2.30 0:0:0:0:0:ffff:150f:21e
21.15.2.31 0:0:0:0:0:ffff:150f:21f
21.15.2.32 0:0:0:0:0:ffff:150f:220
21.15.2.33 0:0:0:0:0:ffff:150f:221
21.15.2.34 0:0:0:0:0:ffff:150f:222
21.15.2.35 0:0:0:0:0:ffff:150f:223
21.15.2.36 0:0:0:0:0:ffff:150f:224
21.15.2.37 0:0:0:0:0:ffff:150f:225
21.15.2.38 0:0:0:0:0:ffff:150f:226
21.15.2.39 0:0:0:0:0:ffff:150f:227
21.15.2.40 0:0:0:0:0:ffff:150f:228
21.15.2.41 0:0:0:0:0:ffff:150f:229
21.15.2.42 0:0:0:0:0:ffff:150f:22a
21.15.2.43 0:0:0:0:0:ffff:150f:22b
21.15.2.44 0:0:0:0:0:ffff:150f:22c
21.15.2.45 0:0:0:0:0:ffff:150f:22d
21.15.2.46 0:0:0:0:0:ffff:150f:22e
21.15.2.47 0:0:0:0:0:ffff:150f:22f
21.15.2.48 0:0:0:0:0:ffff:150f:230
21.15.2.49 0:0:0:0:0:ffff:150f:231
21.15.2.50 0:0:0:0:0:ffff:150f:232
21.15.2.51 0:0:0:0:0:ffff:150f:233
21.15.2.52 0:0:0:0:0:ffff:150f:234
21.15.2.53 0:0:0:0:0:ffff:150f:235
21.15.2.54 0:0:0:0:0:ffff:150f:236
21.15.2.55 0:0:0:0:0:ffff:150f:237
21.15.2.56 0:0:0:0:0:ffff:150f:238
21.15.2.57 0:0:0:0:0:ffff:150f:239
21.15.2.58 0:0:0:0:0:ffff:150f:23a
21.15.2.59 0:0:0:0:0:ffff:150f:23b
21.15.2.60 0:0:0:0:0:ffff:150f:23c


21.15.2.61 0:0:0:0:0:ffff:150f:23d
21.15.2.62 0:0:0:0:0:ffff:150f:23e
21.15.2.63 0:0:0:0:0:ffff:150f:23f
21.15.2.64 0:0:0:0:0:ffff:150f:240
21.15.2.65 0:0:0:0:0:ffff:150f:241
21.15.2.66 0:0:0:0:0:ffff:150f:242
21.15.2.67 0:0:0:0:0:ffff:150f:243
21.15.2.68 0:0:0:0:0:ffff:150f:244
21.15.2.69 0:0:0:0:0:ffff:150f:245
21.15.2.70 0:0:0:0:0:ffff:150f:246
21.15.2.71 0:0:0:0:0:ffff:150f:247
21.15.2.72 0:0:0:0:0:ffff:150f:248
21.15.2.73 0:0:0:0:0:ffff:150f:249
21.15.2.74 0:0:0:0:0:ffff:150f:24a
21.15.2.75 0:0:0:0:0:ffff:150f:24b
21.15.2.76 0:0:0:0:0:ffff:150f:24c
21.15.2.77 0:0:0:0:0:ffff:150f:24d
21.15.2.78 0:0:0:0:0:ffff:150f:24e
21.15.2.79 0:0:0:0:0:ffff:150f:24f
21.15.2.80 0:0:0:0:0:ffff:150f:250
21.15.2.81 0:0:0:0:0:ffff:150f:251
21.15.2.82 0:0:0:0:0:ffff:150f:252
21.15.2.83 0:0:0:0:0:ffff:150f:253
21.15.2.84 0:0:0:0:0:ffff:150f:254
21.15.2.85 0:0:0:0:0:ffff:150f:255
21.15.2.86 0:0:0:0:0:ffff:150f:256
21.15.2.87 0:0:0:0:0:ffff:150f:257
21.15.2.88 0:0:0:0:0:ffff:150f:258
21.15.2.89 0:0:0:0:0:ffff:150f:259
21.15.2.90 0:0:0:0:0:ffff:150f:25a
21.15.2.91 0:0:0:0:0:ffff:150f:25b
21.15.2.92 0:0:0:0:0:ffff:150f:25c
21.15.2.93 0:0:0:0:0:ffff:150f:25d
21.15.2.94 0:0:0:0:0:ffff:150f:25e
21.15.2.95 0:0:0:0:0:ffff:150f:25f
21.15.2.96 0:0:0:0:0:ffff:150f:260
21.15.2.97 0:0:0:0:0:ffff:150f:261
21.15.2.98 0:0:0:0:0:ffff:150f:262
21.15.2.99 0:0:0:0:0:ffff:150f:263
21.15.2.100 0:0:0:0:0:ffff:150f:264
21.15.2.101 0:0:0:0:0:ffff:150f:265
21.15.2.102 0:0:0:0:0:ffff:150f:266
21.15.2.103 0:0:0:0:0:ffff:150f:267
21.15.2.104 0:0:0:0:0:ffff:150f:268
21.15.2.105 0:0:0:0:0:ffff:150f:269
21.15.2.106 0:0:0:0:0:ffff:150f:26a
21.15.2.107 0:0:0:0:0:ffff:150f:26b
21.15.2.108 0:0:0:0:0:ffff:150f:26c
21.15.2.109 0:0:0:0:0:ffff:150f:26d
21.15.2.110 0:0:0:0:0:ffff:150f:26e
21.15.2.111 0:0:0:0:0:ffff:150f:26f
21.15.2.112 0:0:0:0:0:ffff:150f:270
21.15.2.113 0:0:0:0:0:ffff:150f:271
21.15.2.114 0:0:0:0:0:ffff:150f:272
21.15.2.115 0:0:0:0:0:ffff:150f:273
21.15.2.116 0:0:0:0:0:ffff:150f:274
21.15.2.117 0:0:0:0:0:ffff:150f:275
21.15.2.118 0:0:0:0:0:ffff:150f:276
21.15.2.119 0:0:0:0:0:ffff:150f:277
21.15.2.120 0:0:0:0:0:ffff:150f:278


21.15.2.121 0:0:0:0:0:ffff:150f:279
21.15.2.122 0:0:0:0:0:ffff:150f:27a
21.15.2.123 0:0:0:0:0:ffff:150f:27b
21.15.2.124 0:0:0:0:0:ffff:150f:27c
21.15.2.125 0:0:0:0:0:ffff:150f:27d
21.15.2.126 0:0:0:0:0:ffff:150f:27e
21.15.2.127 0:0:0:0:0:ffff:150f:27f
21.15.2.128 0:0:0:0:0:ffff:150f:280
21.15.2.129 0:0:0:0:0:ffff:150f:281
21.15.2.130 0:0:0:0:0:ffff:150f:282
21.15.2.131 0:0:0:0:0:ffff:150f:283
21.15.2.132 0:0:0:0:0:ffff:150f:284
21.15.2.133 0:0:0:0:0:ffff:150f:285
21.15.2.134 0:0:0:0:0:ffff:150f:286
21.15.2.135 0:0:0:0:0:ffff:150f:287
21.15.2.136 0:0:0:0:0:ffff:150f:288
21.15.2.137 0:0:0:0:0:ffff:150f:289
21.15.2.138 0:0:0:0:0:ffff:150f:28a
21.15.2.139 0:0:0:0:0:ffff:150f:28b
21.15.2.140 0:0:0:0:0:ffff:150f:28c
21.15.2.141 0:0:0:0:0:ffff:150f:28d
21.15.2.142 0:0:0:0:0:ffff:150f:28e
21.15.2.143 0:0:0:0:0:ffff:150f:28f
21.15.2.144 0:0:0:0:0:ffff:150f:290
21.15.2.145 0:0:0:0:0:ffff:150f:291
21.15.2.146 0:0:0:0:0:ffff:150f:292
21.15.2.147 0:0:0:0:0:ffff:150f:293
21.15.2.148 0:0:0:0:0:ffff:150f:294
21.15.2.149 0:0:0:0:0:ffff:150f:295
21.15.2.150 0:0:0:0:0:ffff:150f:296
21.15.2.151 0:0:0:0:0:ffff:150f:297
21.15.2.152 0:0:0:0:0:ffff:150f:298
21.15.2.153 0:0:0:0:0:ffff:150f:299
21.15.2.154 0:0:0:0:0:ffff:150f:29a
21.15.2.155 0:0:0:0:0:ffff:150f:29b
21.15.2.156 0:0:0:0:0:ffff:150f:29c
21.15.2.157 0:0:0:0:0:ffff:150f:29d
21.15.2.158 0:0:0:0:0:ffff:150f:29e
21.15.2.159 0:0:0:0:0:ffff:150f:29f
21.15.2.160 0:0:0:0:0:ffff:150f:2a0
21.15.2.161 0:0:0:0:0:ffff:150f:2a1
21.15.2.162 0:0:0:0:0:ffff:150f:2a2
21.15.2.163 0:0:0:0:0:ffff:150f:2a3
21.15.2.164 0:0:0:0:0:ffff:150f:2a4
21.15.2.165 0:0:0:0:0:ffff:150f:2a5
21.15.2.166 0:0:0:0:0:ffff:150f:2a6
21.15.2.167 0:0:0:0:0:ffff:150f:2a7
21.15.2.168 0:0:0:0:0:ffff:150f:2a8
21.15.2.169 0:0:0:0:0:ffff:150f:2a9
21.15.2.170 0:0:0:0:0:ffff:150f:2aa
21.15.2.171 0:0:0:0:0:ffff:150f:2ab
21.15.2.172 0:0:0:0:0:ffff:150f:2ac
21.15.2.173 0:0:0:0:0:ffff:150f:2ad
21.15.2.174 0:0:0:0:0:ffff:150f:2ae
21.15.2.175 0:0:0:0:0:ffff:150f:2af
21.15.2.176 0:0:0:0:0:ffff:150f:2b0
21.15.2.177 0:0:0:0:0:ffff:150f:2b1
21.15.2.178 0:0:0:0:0:ffff:150f:2b2
21.15.2.179 0:0:0:0:0:ffff:150f:2b3
21.15.2.180 0:0:0:0:0:ffff:150f:2b4


21.15.2.181 0:0:0:0:0:ffff:150f:2b5
21.15.2.182 0:0:0:0:0:ffff:150f:2b6
21.15.2.183 0:0:0:0:0:ffff:150f:2b7
21.15.2.184 0:0:0:0:0:ffff:150f:2b8
21.15.2.185 0:0:0:0:0:ffff:150f:2b9
21.15.2.186 0:0:0:0:0:ffff:150f:2ba
21.15.2.187 0:0:0:0:0:ffff:150f:2bb
21.15.2.188 0:0:0:0:0:ffff:150f:2bc
21.15.2.189 0:0:0:0:0:ffff:150f:2bd
21.15.2.190 0:0:0:0:0:ffff:150f:2be
21.15.2.191 0:0:0:0:0:ffff:150f:2bf
21.15.2.192 0:0:0:0:0:ffff:150f:2c0
21.15.2.193 0:0:0:0:0:ffff:150f:2c1
21.15.2.194 0:0:0:0:0:ffff:150f:2c2
21.15.2.195 0:0:0:0:0:ffff:150f:2c3
21.15.2.196 0:0:0:0:0:ffff:150f:2c4
21.15.2.197 0:0:0:0:0:ffff:150f:2c5
21.15.2.198 0:0:0:0:0:ffff:150f:2c6
21.15.2.199 0:0:0:0:0:ffff:150f:2c7
21.15.2.200 0:0:0:0:0:ffff:150f:2c8
21.15.2.201 0:0:0:0:0:ffff:150f:2c9
21.15.2.202 0:0:0:0:0:ffff:150f:2ca
21.15.2.203 0:0:0:0:0:ffff:150f:2cb
21.15.2.204 0:0:0:0:0:ffff:150f:2cc
21.15.2.205 0:0:0:0:0:ffff:150f:2cd
21.15.2.206 0:0:0:0:0:ffff:150f:2ce
21.15.2.207 0:0:0:0:0:ffff:150f:2cf
21.15.2.208 0:0:0:0:0:ffff:150f:2d0
21.15.2.209 0:0:0:0:0:ffff:150f:2d1
21.15.2.210 0:0:0:0:0:ffff:150f:2d2
21.15.2.211 0:0:0:0:0:ffff:150f:2d3
21.15.2.212 0:0:0:0:0:ffff:150f:2d4
21.15.2.213 0:0:0:0:0:ffff:150f:2d5
21.15.2.214 0:0:0:0:0:ffff:150f:2d6
21.15.2.215 0:0:0:0:0:ffff:150f:2d7
21.15.2.216 0:0:0:0:0:ffff:150f:2d8
21.15.2.217 0:0:0:0:0:ffff:150f:2d9
21.15.2.218 0:0:0:0:0:ffff:150f:2da
21.15.2.219 0:0:0:0:0:ffff:150f:2db
21.15.2.220 0:0:0:0:0:ffff:150f:2dc
21.15.2.221 0:0:0:0:0:ffff:150f:2dd
21.15.2.222 0:0:0:0:0:ffff:150f:2de
21.15.2.223 0:0:0:0:0:ffff:150f:2df
21.15.2.224 0:0:0:0:0:ffff:150f:2e0
21.15.2.225 0:0:0:0:0:ffff:150f:2e1
21.15.2.226 0:0:0:0:0:ffff:150f:2e2
21.15.2.227 0:0:0:0:0:ffff:150f:2e3
21.15.2.228 0:0:0:0:0:ffff:150f:2e4
21.15.2.229 0:0:0:0:0:ffff:150f:2e5
21.15.2.230 0:0:0:0:0:ffff:150f:2e6
21.15.2.231 0:0:0:0:0:ffff:150f:2e7
21.15.2.232 0:0:0:0:0:ffff:150f:2e8
21.15.2.233 0:0:0:0:0:ffff:150f:2e9
21.15.2.234 0:0:0:0:0:ffff:150f:2ea
21.15.2.235 0:0:0:0:0:ffff:150f:2eb
21.15.2.236 0:0:0:0:0:ffff:150f:2ec
21.15.2.237 0:0:0:0:0:ffff:150f:2ed
21.15.2.238 0:0:0:0:0:ffff:150f:2ee
21.15.2.239 0:0:0:0:0:ffff:150f:2ef
21.15.2.240 0:0:0:0:0:ffff:150f:2f0
21.15.2.241 0:0:0:0:0:ffff:150f:2f1
21.15.2.242 0:0:0:0:0:ffff:150f:2f2
21.15.2.243 0:0:0:0:0:ffff:150f:2f3
21.15.2.244 0:0:0:0:0:ffff:150f:2f4
21.15.2.245 0:0:0:0:0:ffff:150f:2f5
21.15.2.246 0:0:0:0:0:ffff:150f:2f6
21.15.2.247 0:0:0:0:0:ffff:150f:2f7
21.15.2.248 0:0:0:0:0:ffff:150f:2f8
21.15.2.249 0:0:0:0:0:ffff:150f:2f9
21.15.2.250 0:0:0:0:0:ffff:150f:2fa
21.15.2.251 0:0:0:0:0:ffff:150f:2fb
21.15.2.252 0:0:0:0:0:ffff:150f:2fc
21.15.2.253 0:0:0:0:0:ffff:150f:2fd
21.15.2.254 0:0:0:0:0:ffff:150f:2fe
21.15.2.255 0:0:0:0:0:ffff:150f:2ff


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.