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
67.21.3.1 0:0:0:0:0:ffff:4315:301
67.21.3.2 0:0:0:0:0:ffff:4315:302
67.21.3.3 0:0:0:0:0:ffff:4315:303
67.21.3.4 0:0:0:0:0:ffff:4315:304
67.21.3.5 0:0:0:0:0:ffff:4315:305
67.21.3.6 0:0:0:0:0:ffff:4315:306
67.21.3.7 0:0:0:0:0:ffff:4315:307
67.21.3.8 0:0:0:0:0:ffff:4315:308
67.21.3.9 0:0:0:0:0:ffff:4315:309
67.21.3.10 0:0:0:0:0:ffff:4315:30a
67.21.3.11 0:0:0:0:0:ffff:4315:30b
67.21.3.12 0:0:0:0:0:ffff:4315:30c
67.21.3.13 0:0:0:0:0:ffff:4315:30d
67.21.3.14 0:0:0:0:0:ffff:4315:30e
67.21.3.15 0:0:0:0:0:ffff:4315:30f
67.21.3.16 0:0:0:0:0:ffff:4315:310
67.21.3.17 0:0:0:0:0:ffff:4315:311
67.21.3.18 0:0:0:0:0:ffff:4315:312
67.21.3.19 0:0:0:0:0:ffff:4315:313
67.21.3.20 0:0:0:0:0:ffff:4315:314
67.21.3.21 0:0:0:0:0:ffff:4315:315
67.21.3.22 0:0:0:0:0:ffff:4315:316
67.21.3.23 0:0:0:0:0:ffff:4315:317
67.21.3.24 0:0:0:0:0:ffff:4315:318
67.21.3.25 0:0:0:0:0:ffff:4315:319
67.21.3.26 0:0:0:0:0:ffff:4315:31a
67.21.3.27 0:0:0:0:0:ffff:4315:31b
67.21.3.28 0:0:0:0:0:ffff:4315:31c
67.21.3.29 0:0:0:0:0:ffff:4315:31d
67.21.3.30 0:0:0:0:0:ffff:4315:31e
67.21.3.31 0:0:0:0:0:ffff:4315:31f
67.21.3.32 0:0:0:0:0:ffff:4315:320
67.21.3.33 0:0:0:0:0:ffff:4315:321
67.21.3.34 0:0:0:0:0:ffff:4315:322
67.21.3.35 0:0:0:0:0:ffff:4315:323
67.21.3.36 0:0:0:0:0:ffff:4315:324
67.21.3.37 0:0:0:0:0:ffff:4315:325
67.21.3.38 0:0:0:0:0:ffff:4315:326
67.21.3.39 0:0:0:0:0:ffff:4315:327
67.21.3.40 0:0:0:0:0:ffff:4315:328
67.21.3.41 0:0:0:0:0:ffff:4315:329
67.21.3.42 0:0:0:0:0:ffff:4315:32a
67.21.3.43 0:0:0:0:0:ffff:4315:32b
67.21.3.44 0:0:0:0:0:ffff:4315:32c
67.21.3.45 0:0:0:0:0:ffff:4315:32d
67.21.3.46 0:0:0:0:0:ffff:4315:32e
67.21.3.47 0:0:0:0:0:ffff:4315:32f
67.21.3.48 0:0:0:0:0:ffff:4315:330
67.21.3.49 0:0:0:0:0:ffff:4315:331
67.21.3.50 0:0:0:0:0:ffff:4315:332
67.21.3.51 0:0:0:0:0:ffff:4315:333
67.21.3.52 0:0:0:0:0:ffff:4315:334
67.21.3.53 0:0:0:0:0:ffff:4315:335
67.21.3.54 0:0:0:0:0:ffff:4315:336
67.21.3.55 0:0:0:0:0:ffff:4315:337
67.21.3.56 0:0:0:0:0:ffff:4315:338
67.21.3.57 0:0:0:0:0:ffff:4315:339
67.21.3.58 0:0:0:0:0:ffff:4315:33a
67.21.3.59 0:0:0:0:0:ffff:4315:33b
67.21.3.60 0:0:0:0:0:ffff:4315:33c


67.21.3.61 0:0:0:0:0:ffff:4315:33d
67.21.3.62 0:0:0:0:0:ffff:4315:33e
67.21.3.63 0:0:0:0:0:ffff:4315:33f
67.21.3.64 0:0:0:0:0:ffff:4315:340
67.21.3.65 0:0:0:0:0:ffff:4315:341
67.21.3.66 0:0:0:0:0:ffff:4315:342
67.21.3.67 0:0:0:0:0:ffff:4315:343
67.21.3.68 0:0:0:0:0:ffff:4315:344
67.21.3.69 0:0:0:0:0:ffff:4315:345
67.21.3.70 0:0:0:0:0:ffff:4315:346
67.21.3.71 0:0:0:0:0:ffff:4315:347
67.21.3.72 0:0:0:0:0:ffff:4315:348
67.21.3.73 0:0:0:0:0:ffff:4315:349
67.21.3.74 0:0:0:0:0:ffff:4315:34a
67.21.3.75 0:0:0:0:0:ffff:4315:34b
67.21.3.76 0:0:0:0:0:ffff:4315:34c
67.21.3.77 0:0:0:0:0:ffff:4315:34d
67.21.3.78 0:0:0:0:0:ffff:4315:34e
67.21.3.79 0:0:0:0:0:ffff:4315:34f
67.21.3.80 0:0:0:0:0:ffff:4315:350
67.21.3.81 0:0:0:0:0:ffff:4315:351
67.21.3.82 0:0:0:0:0:ffff:4315:352
67.21.3.83 0:0:0:0:0:ffff:4315:353
67.21.3.84 0:0:0:0:0:ffff:4315:354
67.21.3.85 0:0:0:0:0:ffff:4315:355
67.21.3.86 0:0:0:0:0:ffff:4315:356
67.21.3.87 0:0:0:0:0:ffff:4315:357
67.21.3.88 0:0:0:0:0:ffff:4315:358
67.21.3.89 0:0:0:0:0:ffff:4315:359
67.21.3.90 0:0:0:0:0:ffff:4315:35a
67.21.3.91 0:0:0:0:0:ffff:4315:35b
67.21.3.92 0:0:0:0:0:ffff:4315:35c
67.21.3.93 0:0:0:0:0:ffff:4315:35d
67.21.3.94 0:0:0:0:0:ffff:4315:35e
67.21.3.95 0:0:0:0:0:ffff:4315:35f
67.21.3.96 0:0:0:0:0:ffff:4315:360
67.21.3.97 0:0:0:0:0:ffff:4315:361
67.21.3.98 0:0:0:0:0:ffff:4315:362
67.21.3.99 0:0:0:0:0:ffff:4315:363
67.21.3.100 0:0:0:0:0:ffff:4315:364
67.21.3.101 0:0:0:0:0:ffff:4315:365
67.21.3.102 0:0:0:0:0:ffff:4315:366
67.21.3.103 0:0:0:0:0:ffff:4315:367
67.21.3.104 0:0:0:0:0:ffff:4315:368
67.21.3.105 0:0:0:0:0:ffff:4315:369
67.21.3.106 0:0:0:0:0:ffff:4315:36a
67.21.3.107 0:0:0:0:0:ffff:4315:36b
67.21.3.108 0:0:0:0:0:ffff:4315:36c
67.21.3.109 0:0:0:0:0:ffff:4315:36d
67.21.3.110 0:0:0:0:0:ffff:4315:36e
67.21.3.111 0:0:0:0:0:ffff:4315:36f
67.21.3.112 0:0:0:0:0:ffff:4315:370
67.21.3.113 0:0:0:0:0:ffff:4315:371
67.21.3.114 0:0:0:0:0:ffff:4315:372
67.21.3.115 0:0:0:0:0:ffff:4315:373
67.21.3.116 0:0:0:0:0:ffff:4315:374
67.21.3.117 0:0:0:0:0:ffff:4315:375
67.21.3.118 0:0:0:0:0:ffff:4315:376
67.21.3.119 0:0:0:0:0:ffff:4315:377
67.21.3.120 0:0:0:0:0:ffff:4315:378


67.21.3.121 0:0:0:0:0:ffff:4315:379
67.21.3.122 0:0:0:0:0:ffff:4315:37a
67.21.3.123 0:0:0:0:0:ffff:4315:37b
67.21.3.124 0:0:0:0:0:ffff:4315:37c
67.21.3.125 0:0:0:0:0:ffff:4315:37d
67.21.3.126 0:0:0:0:0:ffff:4315:37e
67.21.3.127 0:0:0:0:0:ffff:4315:37f
67.21.3.128 0:0:0:0:0:ffff:4315:380
67.21.3.129 0:0:0:0:0:ffff:4315:381
67.21.3.130 0:0:0:0:0:ffff:4315:382
67.21.3.131 0:0:0:0:0:ffff:4315:383
67.21.3.132 0:0:0:0:0:ffff:4315:384
67.21.3.133 0:0:0:0:0:ffff:4315:385
67.21.3.134 0:0:0:0:0:ffff:4315:386
67.21.3.135 0:0:0:0:0:ffff:4315:387
67.21.3.136 0:0:0:0:0:ffff:4315:388
67.21.3.137 0:0:0:0:0:ffff:4315:389
67.21.3.138 0:0:0:0:0:ffff:4315:38a
67.21.3.139 0:0:0:0:0:ffff:4315:38b
67.21.3.140 0:0:0:0:0:ffff:4315:38c
67.21.3.141 0:0:0:0:0:ffff:4315:38d
67.21.3.142 0:0:0:0:0:ffff:4315:38e
67.21.3.143 0:0:0:0:0:ffff:4315:38f
67.21.3.144 0:0:0:0:0:ffff:4315:390
67.21.3.145 0:0:0:0:0:ffff:4315:391
67.21.3.146 0:0:0:0:0:ffff:4315:392
67.21.3.147 0:0:0:0:0:ffff:4315:393
67.21.3.148 0:0:0:0:0:ffff:4315:394
67.21.3.149 0:0:0:0:0:ffff:4315:395
67.21.3.150 0:0:0:0:0:ffff:4315:396
67.21.3.151 0:0:0:0:0:ffff:4315:397
67.21.3.152 0:0:0:0:0:ffff:4315:398
67.21.3.153 0:0:0:0:0:ffff:4315:399
67.21.3.154 0:0:0:0:0:ffff:4315:39a
67.21.3.155 0:0:0:0:0:ffff:4315:39b
67.21.3.156 0:0:0:0:0:ffff:4315:39c
67.21.3.157 0:0:0:0:0:ffff:4315:39d
67.21.3.158 0:0:0:0:0:ffff:4315:39e
67.21.3.159 0:0:0:0:0:ffff:4315:39f
67.21.3.160 0:0:0:0:0:ffff:4315:3a0
67.21.3.161 0:0:0:0:0:ffff:4315:3a1
67.21.3.162 0:0:0:0:0:ffff:4315:3a2
67.21.3.163 0:0:0:0:0:ffff:4315:3a3
67.21.3.164 0:0:0:0:0:ffff:4315:3a4
67.21.3.165 0:0:0:0:0:ffff:4315:3a5
67.21.3.166 0:0:0:0:0:ffff:4315:3a6
67.21.3.167 0:0:0:0:0:ffff:4315:3a7
67.21.3.168 0:0:0:0:0:ffff:4315:3a8
67.21.3.169 0:0:0:0:0:ffff:4315:3a9
67.21.3.170 0:0:0:0:0:ffff:4315:3aa
67.21.3.171 0:0:0:0:0:ffff:4315:3ab
67.21.3.172 0:0:0:0:0:ffff:4315:3ac
67.21.3.173 0:0:0:0:0:ffff:4315:3ad
67.21.3.174 0:0:0:0:0:ffff:4315:3ae
67.21.3.175 0:0:0:0:0:ffff:4315:3af
67.21.3.176 0:0:0:0:0:ffff:4315:3b0
67.21.3.177 0:0:0:0:0:ffff:4315:3b1
67.21.3.178 0:0:0:0:0:ffff:4315:3b2
67.21.3.179 0:0:0:0:0:ffff:4315:3b3
67.21.3.180 0:0:0:0:0:ffff:4315:3b4


67.21.3.181 0:0:0:0:0:ffff:4315:3b5
67.21.3.182 0:0:0:0:0:ffff:4315:3b6
67.21.3.183 0:0:0:0:0:ffff:4315:3b7
67.21.3.184 0:0:0:0:0:ffff:4315:3b8
67.21.3.185 0:0:0:0:0:ffff:4315:3b9
67.21.3.186 0:0:0:0:0:ffff:4315:3ba
67.21.3.187 0:0:0:0:0:ffff:4315:3bb
67.21.3.188 0:0:0:0:0:ffff:4315:3bc
67.21.3.189 0:0:0:0:0:ffff:4315:3bd
67.21.3.190 0:0:0:0:0:ffff:4315:3be
67.21.3.191 0:0:0:0:0:ffff:4315:3bf
67.21.3.192 0:0:0:0:0:ffff:4315:3c0
67.21.3.193 0:0:0:0:0:ffff:4315:3c1
67.21.3.194 0:0:0:0:0:ffff:4315:3c2
67.21.3.195 0:0:0:0:0:ffff:4315:3c3
67.21.3.196 0:0:0:0:0:ffff:4315:3c4
67.21.3.197 0:0:0:0:0:ffff:4315:3c5
67.21.3.198 0:0:0:0:0:ffff:4315:3c6
67.21.3.199 0:0:0:0:0:ffff:4315:3c7
67.21.3.200 0:0:0:0:0:ffff:4315:3c8
67.21.3.201 0:0:0:0:0:ffff:4315:3c9
67.21.3.202 0:0:0:0:0:ffff:4315:3ca
67.21.3.203 0:0:0:0:0:ffff:4315:3cb
67.21.3.204 0:0:0:0:0:ffff:4315:3cc
67.21.3.205 0:0:0:0:0:ffff:4315:3cd
67.21.3.206 0:0:0:0:0:ffff:4315:3ce
67.21.3.207 0:0:0:0:0:ffff:4315:3cf
67.21.3.208 0:0:0:0:0:ffff:4315:3d0
67.21.3.209 0:0:0:0:0:ffff:4315:3d1
67.21.3.210 0:0:0:0:0:ffff:4315:3d2
67.21.3.211 0:0:0:0:0:ffff:4315:3d3
67.21.3.212 0:0:0:0:0:ffff:4315:3d4
67.21.3.213 0:0:0:0:0:ffff:4315:3d5
67.21.3.214 0:0:0:0:0:ffff:4315:3d6
67.21.3.215 0:0:0:0:0:ffff:4315:3d7
67.21.3.216 0:0:0:0:0:ffff:4315:3d8
67.21.3.217 0:0:0:0:0:ffff:4315:3d9
67.21.3.218 0:0:0:0:0:ffff:4315:3da
67.21.3.219 0:0:0:0:0:ffff:4315:3db
67.21.3.220 0:0:0:0:0:ffff:4315:3dc
67.21.3.221 0:0:0:0:0:ffff:4315:3dd
67.21.3.222 0:0:0:0:0:ffff:4315:3de
67.21.3.223 0:0:0:0:0:ffff:4315:3df
67.21.3.224 0:0:0:0:0:ffff:4315:3e0
67.21.3.225 0:0:0:0:0:ffff:4315:3e1
67.21.3.226 0:0:0:0:0:ffff:4315:3e2
67.21.3.227 0:0:0:0:0:ffff:4315:3e3
67.21.3.228 0:0:0:0:0:ffff:4315:3e4
67.21.3.229 0:0:0:0:0:ffff:4315:3e5
67.21.3.230 0:0:0:0:0:ffff:4315:3e6
67.21.3.231 0:0:0:0:0:ffff:4315:3e7
67.21.3.232 0:0:0:0:0:ffff:4315:3e8
67.21.3.233 0:0:0:0:0:ffff:4315:3e9
67.21.3.234 0:0:0:0:0:ffff:4315:3ea
67.21.3.235 0:0:0:0:0:ffff:4315:3eb
67.21.3.236 0:0:0:0:0:ffff:4315:3ec
67.21.3.237 0:0:0:0:0:ffff:4315:3ed
67.21.3.238 0:0:0:0:0:ffff:4315:3ee
67.21.3.239 0:0:0:0:0:ffff:4315:3ef
67.21.3.240 0:0:0:0:0:ffff:4315:3f0
67.21.3.241 0:0:0:0:0:ffff:4315:3f1
67.21.3.242 0:0:0:0:0:ffff:4315:3f2
67.21.3.243 0:0:0:0:0:ffff:4315:3f3
67.21.3.244 0:0:0:0:0:ffff:4315:3f4
67.21.3.245 0:0:0:0:0:ffff:4315:3f5
67.21.3.246 0:0:0:0:0:ffff:4315:3f6
67.21.3.247 0:0:0:0:0:ffff:4315:3f7
67.21.3.248 0:0:0:0:0:ffff:4315:3f8
67.21.3.249 0:0:0:0:0:ffff:4315:3f9
67.21.3.250 0:0:0:0:0:ffff:4315:3fa
67.21.3.251 0:0:0:0:0:ffff:4315:3fb
67.21.3.252 0:0:0:0:0:ffff:4315:3fc
67.21.3.253 0:0:0:0:0:ffff:4315:3fd
67.21.3.254 0:0:0:0:0:ffff:4315:3fe
67.21.3.255 0:0:0:0:0:ffff:4315:3ff


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.