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
21.15.51.1 0:0:0:0:0:ffff:150f:3301
21.15.51.2 0:0:0:0:0:ffff:150f:3302
21.15.51.3 0:0:0:0:0:ffff:150f:3303
21.15.51.4 0:0:0:0:0:ffff:150f:3304
21.15.51.5 0:0:0:0:0:ffff:150f:3305
21.15.51.6 0:0:0:0:0:ffff:150f:3306
21.15.51.7 0:0:0:0:0:ffff:150f:3307
21.15.51.8 0:0:0:0:0:ffff:150f:3308
21.15.51.9 0:0:0:0:0:ffff:150f:3309
21.15.51.10 0:0:0:0:0:ffff:150f:330a
21.15.51.11 0:0:0:0:0:ffff:150f:330b
21.15.51.12 0:0:0:0:0:ffff:150f:330c
21.15.51.13 0:0:0:0:0:ffff:150f:330d
21.15.51.14 0:0:0:0:0:ffff:150f:330e
21.15.51.15 0:0:0:0:0:ffff:150f:330f
21.15.51.16 0:0:0:0:0:ffff:150f:3310
21.15.51.17 0:0:0:0:0:ffff:150f:3311
21.15.51.18 0:0:0:0:0:ffff:150f:3312
21.15.51.19 0:0:0:0:0:ffff:150f:3313
21.15.51.20 0:0:0:0:0:ffff:150f:3314
21.15.51.21 0:0:0:0:0:ffff:150f:3315
21.15.51.22 0:0:0:0:0:ffff:150f:3316
21.15.51.23 0:0:0:0:0:ffff:150f:3317
21.15.51.24 0:0:0:0:0:ffff:150f:3318
21.15.51.25 0:0:0:0:0:ffff:150f:3319
21.15.51.26 0:0:0:0:0:ffff:150f:331a
21.15.51.27 0:0:0:0:0:ffff:150f:331b
21.15.51.28 0:0:0:0:0:ffff:150f:331c
21.15.51.29 0:0:0:0:0:ffff:150f:331d
21.15.51.30 0:0:0:0:0:ffff:150f:331e
21.15.51.31 0:0:0:0:0:ffff:150f:331f
21.15.51.32 0:0:0:0:0:ffff:150f:3320
21.15.51.33 0:0:0:0:0:ffff:150f:3321
21.15.51.34 0:0:0:0:0:ffff:150f:3322
21.15.51.35 0:0:0:0:0:ffff:150f:3323
21.15.51.36 0:0:0:0:0:ffff:150f:3324
21.15.51.37 0:0:0:0:0:ffff:150f:3325
21.15.51.38 0:0:0:0:0:ffff:150f:3326
21.15.51.39 0:0:0:0:0:ffff:150f:3327
21.15.51.40 0:0:0:0:0:ffff:150f:3328
21.15.51.41 0:0:0:0:0:ffff:150f:3329
21.15.51.42 0:0:0:0:0:ffff:150f:332a
21.15.51.43 0:0:0:0:0:ffff:150f:332b
21.15.51.44 0:0:0:0:0:ffff:150f:332c
21.15.51.45 0:0:0:0:0:ffff:150f:332d
21.15.51.46 0:0:0:0:0:ffff:150f:332e
21.15.51.47 0:0:0:0:0:ffff:150f:332f
21.15.51.48 0:0:0:0:0:ffff:150f:3330
21.15.51.49 0:0:0:0:0:ffff:150f:3331
21.15.51.50 0:0:0:0:0:ffff:150f:3332
21.15.51.51 0:0:0:0:0:ffff:150f:3333
21.15.51.52 0:0:0:0:0:ffff:150f:3334
21.15.51.53 0:0:0:0:0:ffff:150f:3335
21.15.51.54 0:0:0:0:0:ffff:150f:3336
21.15.51.55 0:0:0:0:0:ffff:150f:3337
21.15.51.56 0:0:0:0:0:ffff:150f:3338
21.15.51.57 0:0:0:0:0:ffff:150f:3339
21.15.51.58 0:0:0:0:0:ffff:150f:333a
21.15.51.59 0:0:0:0:0:ffff:150f:333b
21.15.51.60 0:0:0:0:0:ffff:150f:333c


21.15.51.61 0:0:0:0:0:ffff:150f:333d
21.15.51.62 0:0:0:0:0:ffff:150f:333e
21.15.51.63 0:0:0:0:0:ffff:150f:333f
21.15.51.64 0:0:0:0:0:ffff:150f:3340
21.15.51.65 0:0:0:0:0:ffff:150f:3341
21.15.51.66 0:0:0:0:0:ffff:150f:3342
21.15.51.67 0:0:0:0:0:ffff:150f:3343
21.15.51.68 0:0:0:0:0:ffff:150f:3344
21.15.51.69 0:0:0:0:0:ffff:150f:3345
21.15.51.70 0:0:0:0:0:ffff:150f:3346
21.15.51.71 0:0:0:0:0:ffff:150f:3347
21.15.51.72 0:0:0:0:0:ffff:150f:3348
21.15.51.73 0:0:0:0:0:ffff:150f:3349
21.15.51.74 0:0:0:0:0:ffff:150f:334a
21.15.51.75 0:0:0:0:0:ffff:150f:334b
21.15.51.76 0:0:0:0:0:ffff:150f:334c
21.15.51.77 0:0:0:0:0:ffff:150f:334d
21.15.51.78 0:0:0:0:0:ffff:150f:334e
21.15.51.79 0:0:0:0:0:ffff:150f:334f
21.15.51.80 0:0:0:0:0:ffff:150f:3350
21.15.51.81 0:0:0:0:0:ffff:150f:3351
21.15.51.82 0:0:0:0:0:ffff:150f:3352
21.15.51.83 0:0:0:0:0:ffff:150f:3353
21.15.51.84 0:0:0:0:0:ffff:150f:3354
21.15.51.85 0:0:0:0:0:ffff:150f:3355
21.15.51.86 0:0:0:0:0:ffff:150f:3356
21.15.51.87 0:0:0:0:0:ffff:150f:3357
21.15.51.88 0:0:0:0:0:ffff:150f:3358
21.15.51.89 0:0:0:0:0:ffff:150f:3359
21.15.51.90 0:0:0:0:0:ffff:150f:335a
21.15.51.91 0:0:0:0:0:ffff:150f:335b
21.15.51.92 0:0:0:0:0:ffff:150f:335c
21.15.51.93 0:0:0:0:0:ffff:150f:335d
21.15.51.94 0:0:0:0:0:ffff:150f:335e
21.15.51.95 0:0:0:0:0:ffff:150f:335f
21.15.51.96 0:0:0:0:0:ffff:150f:3360
21.15.51.97 0:0:0:0:0:ffff:150f:3361
21.15.51.98 0:0:0:0:0:ffff:150f:3362
21.15.51.99 0:0:0:0:0:ffff:150f:3363
21.15.51.100 0:0:0:0:0:ffff:150f:3364
21.15.51.101 0:0:0:0:0:ffff:150f:3365
21.15.51.102 0:0:0:0:0:ffff:150f:3366
21.15.51.103 0:0:0:0:0:ffff:150f:3367
21.15.51.104 0:0:0:0:0:ffff:150f:3368
21.15.51.105 0:0:0:0:0:ffff:150f:3369
21.15.51.106 0:0:0:0:0:ffff:150f:336a
21.15.51.107 0:0:0:0:0:ffff:150f:336b
21.15.51.108 0:0:0:0:0:ffff:150f:336c
21.15.51.109 0:0:0:0:0:ffff:150f:336d
21.15.51.110 0:0:0:0:0:ffff:150f:336e
21.15.51.111 0:0:0:0:0:ffff:150f:336f
21.15.51.112 0:0:0:0:0:ffff:150f:3370
21.15.51.113 0:0:0:0:0:ffff:150f:3371
21.15.51.114 0:0:0:0:0:ffff:150f:3372
21.15.51.115 0:0:0:0:0:ffff:150f:3373
21.15.51.116 0:0:0:0:0:ffff:150f:3374
21.15.51.117 0:0:0:0:0:ffff:150f:3375
21.15.51.118 0:0:0:0:0:ffff:150f:3376
21.15.51.119 0:0:0:0:0:ffff:150f:3377
21.15.51.120 0:0:0:0:0:ffff:150f:3378


21.15.51.121 0:0:0:0:0:ffff:150f:3379
21.15.51.122 0:0:0:0:0:ffff:150f:337a
21.15.51.123 0:0:0:0:0:ffff:150f:337b
21.15.51.124 0:0:0:0:0:ffff:150f:337c
21.15.51.125 0:0:0:0:0:ffff:150f:337d
21.15.51.126 0:0:0:0:0:ffff:150f:337e
21.15.51.127 0:0:0:0:0:ffff:150f:337f
21.15.51.128 0:0:0:0:0:ffff:150f:3380
21.15.51.129 0:0:0:0:0:ffff:150f:3381
21.15.51.130 0:0:0:0:0:ffff:150f:3382
21.15.51.131 0:0:0:0:0:ffff:150f:3383
21.15.51.132 0:0:0:0:0:ffff:150f:3384
21.15.51.133 0:0:0:0:0:ffff:150f:3385
21.15.51.134 0:0:0:0:0:ffff:150f:3386
21.15.51.135 0:0:0:0:0:ffff:150f:3387
21.15.51.136 0:0:0:0:0:ffff:150f:3388
21.15.51.137 0:0:0:0:0:ffff:150f:3389
21.15.51.138 0:0:0:0:0:ffff:150f:338a
21.15.51.139 0:0:0:0:0:ffff:150f:338b
21.15.51.140 0:0:0:0:0:ffff:150f:338c
21.15.51.141 0:0:0:0:0:ffff:150f:338d
21.15.51.142 0:0:0:0:0:ffff:150f:338e
21.15.51.143 0:0:0:0:0:ffff:150f:338f
21.15.51.144 0:0:0:0:0:ffff:150f:3390
21.15.51.145 0:0:0:0:0:ffff:150f:3391
21.15.51.146 0:0:0:0:0:ffff:150f:3392
21.15.51.147 0:0:0:0:0:ffff:150f:3393
21.15.51.148 0:0:0:0:0:ffff:150f:3394
21.15.51.149 0:0:0:0:0:ffff:150f:3395
21.15.51.150 0:0:0:0:0:ffff:150f:3396
21.15.51.151 0:0:0:0:0:ffff:150f:3397
21.15.51.152 0:0:0:0:0:ffff:150f:3398
21.15.51.153 0:0:0:0:0:ffff:150f:3399
21.15.51.154 0:0:0:0:0:ffff:150f:339a
21.15.51.155 0:0:0:0:0:ffff:150f:339b
21.15.51.156 0:0:0:0:0:ffff:150f:339c
21.15.51.157 0:0:0:0:0:ffff:150f:339d
21.15.51.158 0:0:0:0:0:ffff:150f:339e
21.15.51.159 0:0:0:0:0:ffff:150f:339f
21.15.51.160 0:0:0:0:0:ffff:150f:33a0
21.15.51.161 0:0:0:0:0:ffff:150f:33a1
21.15.51.162 0:0:0:0:0:ffff:150f:33a2
21.15.51.163 0:0:0:0:0:ffff:150f:33a3
21.15.51.164 0:0:0:0:0:ffff:150f:33a4
21.15.51.165 0:0:0:0:0:ffff:150f:33a5
21.15.51.166 0:0:0:0:0:ffff:150f:33a6
21.15.51.167 0:0:0:0:0:ffff:150f:33a7
21.15.51.168 0:0:0:0:0:ffff:150f:33a8
21.15.51.169 0:0:0:0:0:ffff:150f:33a9
21.15.51.170 0:0:0:0:0:ffff:150f:33aa
21.15.51.171 0:0:0:0:0:ffff:150f:33ab
21.15.51.172 0:0:0:0:0:ffff:150f:33ac
21.15.51.173 0:0:0:0:0:ffff:150f:33ad
21.15.51.174 0:0:0:0:0:ffff:150f:33ae
21.15.51.175 0:0:0:0:0:ffff:150f:33af
21.15.51.176 0:0:0:0:0:ffff:150f:33b0
21.15.51.177 0:0:0:0:0:ffff:150f:33b1
21.15.51.178 0:0:0:0:0:ffff:150f:33b2
21.15.51.179 0:0:0:0:0:ffff:150f:33b3
21.15.51.180 0:0:0:0:0:ffff:150f:33b4


21.15.51.181 0:0:0:0:0:ffff:150f:33b5
21.15.51.182 0:0:0:0:0:ffff:150f:33b6
21.15.51.183 0:0:0:0:0:ffff:150f:33b7
21.15.51.184 0:0:0:0:0:ffff:150f:33b8
21.15.51.185 0:0:0:0:0:ffff:150f:33b9
21.15.51.186 0:0:0:0:0:ffff:150f:33ba
21.15.51.187 0:0:0:0:0:ffff:150f:33bb
21.15.51.188 0:0:0:0:0:ffff:150f:33bc
21.15.51.189 0:0:0:0:0:ffff:150f:33bd
21.15.51.190 0:0:0:0:0:ffff:150f:33be
21.15.51.191 0:0:0:0:0:ffff:150f:33bf
21.15.51.192 0:0:0:0:0:ffff:150f:33c0
21.15.51.193 0:0:0:0:0:ffff:150f:33c1
21.15.51.194 0:0:0:0:0:ffff:150f:33c2
21.15.51.195 0:0:0:0:0:ffff:150f:33c3
21.15.51.196 0:0:0:0:0:ffff:150f:33c4
21.15.51.197 0:0:0:0:0:ffff:150f:33c5
21.15.51.198 0:0:0:0:0:ffff:150f:33c6
21.15.51.199 0:0:0:0:0:ffff:150f:33c7
21.15.51.200 0:0:0:0:0:ffff:150f:33c8
21.15.51.201 0:0:0:0:0:ffff:150f:33c9
21.15.51.202 0:0:0:0:0:ffff:150f:33ca
21.15.51.203 0:0:0:0:0:ffff:150f:33cb
21.15.51.204 0:0:0:0:0:ffff:150f:33cc
21.15.51.205 0:0:0:0:0:ffff:150f:33cd
21.15.51.206 0:0:0:0:0:ffff:150f:33ce
21.15.51.207 0:0:0:0:0:ffff:150f:33cf
21.15.51.208 0:0:0:0:0:ffff:150f:33d0
21.15.51.209 0:0:0:0:0:ffff:150f:33d1
21.15.51.210 0:0:0:0:0:ffff:150f:33d2
21.15.51.211 0:0:0:0:0:ffff:150f:33d3
21.15.51.212 0:0:0:0:0:ffff:150f:33d4
21.15.51.213 0:0:0:0:0:ffff:150f:33d5
21.15.51.214 0:0:0:0:0:ffff:150f:33d6
21.15.51.215 0:0:0:0:0:ffff:150f:33d7
21.15.51.216 0:0:0:0:0:ffff:150f:33d8
21.15.51.217 0:0:0:0:0:ffff:150f:33d9
21.15.51.218 0:0:0:0:0:ffff:150f:33da
21.15.51.219 0:0:0:0:0:ffff:150f:33db
21.15.51.220 0:0:0:0:0:ffff:150f:33dc
21.15.51.221 0:0:0:0:0:ffff:150f:33dd
21.15.51.222 0:0:0:0:0:ffff:150f:33de
21.15.51.223 0:0:0:0:0:ffff:150f:33df
21.15.51.224 0:0:0:0:0:ffff:150f:33e0
21.15.51.225 0:0:0:0:0:ffff:150f:33e1
21.15.51.226 0:0:0:0:0:ffff:150f:33e2
21.15.51.227 0:0:0:0:0:ffff:150f:33e3
21.15.51.228 0:0:0:0:0:ffff:150f:33e4
21.15.51.229 0:0:0:0:0:ffff:150f:33e5
21.15.51.230 0:0:0:0:0:ffff:150f:33e6
21.15.51.231 0:0:0:0:0:ffff:150f:33e7
21.15.51.232 0:0:0:0:0:ffff:150f:33e8
21.15.51.233 0:0:0:0:0:ffff:150f:33e9
21.15.51.234 0:0:0:0:0:ffff:150f:33ea
21.15.51.235 0:0:0:0:0:ffff:150f:33eb
21.15.51.236 0:0:0:0:0:ffff:150f:33ec
21.15.51.237 0:0:0:0:0:ffff:150f:33ed
21.15.51.238 0:0:0:0:0:ffff:150f:33ee
21.15.51.239 0:0:0:0:0:ffff:150f:33ef
21.15.51.240 0:0:0:0:0:ffff:150f:33f0
21.15.51.241 0:0:0:0:0:ffff:150f:33f1
21.15.51.242 0:0:0:0:0:ffff:150f:33f2
21.15.51.243 0:0:0:0:0:ffff:150f:33f3
21.15.51.244 0:0:0:0:0:ffff:150f:33f4
21.15.51.245 0:0:0:0:0:ffff:150f:33f5
21.15.51.246 0:0:0:0:0:ffff:150f:33f6
21.15.51.247 0:0:0:0:0:ffff:150f:33f7
21.15.51.248 0:0:0:0:0:ffff:150f:33f8
21.15.51.249 0:0:0:0:0:ffff:150f:33f9
21.15.51.250 0:0:0:0:0:ffff:150f:33fa
21.15.51.251 0:0:0:0:0:ffff:150f:33fb
21.15.51.252 0:0:0:0:0:ffff:150f:33fc
21.15.51.253 0:0:0:0:0:ffff:150f:33fd
21.15.51.254 0:0:0:0:0:ffff:150f:33fe
21.15.51.255 0:0:0:0:0:ffff:150f:33ff


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.