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
21.91.131.1 0:0:0:0:0:ffff:155b:8301
21.91.131.2 0:0:0:0:0:ffff:155b:8302
21.91.131.3 0:0:0:0:0:ffff:155b:8303
21.91.131.4 0:0:0:0:0:ffff:155b:8304
21.91.131.5 0:0:0:0:0:ffff:155b:8305
21.91.131.6 0:0:0:0:0:ffff:155b:8306
21.91.131.7 0:0:0:0:0:ffff:155b:8307
21.91.131.8 0:0:0:0:0:ffff:155b:8308
21.91.131.9 0:0:0:0:0:ffff:155b:8309
21.91.131.10 0:0:0:0:0:ffff:155b:830a
21.91.131.11 0:0:0:0:0:ffff:155b:830b
21.91.131.12 0:0:0:0:0:ffff:155b:830c
21.91.131.13 0:0:0:0:0:ffff:155b:830d
21.91.131.14 0:0:0:0:0:ffff:155b:830e
21.91.131.15 0:0:0:0:0:ffff:155b:830f
21.91.131.16 0:0:0:0:0:ffff:155b:8310
21.91.131.17 0:0:0:0:0:ffff:155b:8311
21.91.131.18 0:0:0:0:0:ffff:155b:8312
21.91.131.19 0:0:0:0:0:ffff:155b:8313
21.91.131.20 0:0:0:0:0:ffff:155b:8314
21.91.131.21 0:0:0:0:0:ffff:155b:8315
21.91.131.22 0:0:0:0:0:ffff:155b:8316
21.91.131.23 0:0:0:0:0:ffff:155b:8317
21.91.131.24 0:0:0:0:0:ffff:155b:8318
21.91.131.25 0:0:0:0:0:ffff:155b:8319
21.91.131.26 0:0:0:0:0:ffff:155b:831a
21.91.131.27 0:0:0:0:0:ffff:155b:831b
21.91.131.28 0:0:0:0:0:ffff:155b:831c
21.91.131.29 0:0:0:0:0:ffff:155b:831d
21.91.131.30 0:0:0:0:0:ffff:155b:831e
21.91.131.31 0:0:0:0:0:ffff:155b:831f
21.91.131.32 0:0:0:0:0:ffff:155b:8320
21.91.131.33 0:0:0:0:0:ffff:155b:8321
21.91.131.34 0:0:0:0:0:ffff:155b:8322
21.91.131.35 0:0:0:0:0:ffff:155b:8323
21.91.131.36 0:0:0:0:0:ffff:155b:8324
21.91.131.37 0:0:0:0:0:ffff:155b:8325
21.91.131.38 0:0:0:0:0:ffff:155b:8326
21.91.131.39 0:0:0:0:0:ffff:155b:8327
21.91.131.40 0:0:0:0:0:ffff:155b:8328
21.91.131.41 0:0:0:0:0:ffff:155b:8329
21.91.131.42 0:0:0:0:0:ffff:155b:832a
21.91.131.43 0:0:0:0:0:ffff:155b:832b
21.91.131.44 0:0:0:0:0:ffff:155b:832c
21.91.131.45 0:0:0:0:0:ffff:155b:832d
21.91.131.46 0:0:0:0:0:ffff:155b:832e
21.91.131.47 0:0:0:0:0:ffff:155b:832f
21.91.131.48 0:0:0:0:0:ffff:155b:8330
21.91.131.49 0:0:0:0:0:ffff:155b:8331
21.91.131.50 0:0:0:0:0:ffff:155b:8332
21.91.131.51 0:0:0:0:0:ffff:155b:8333
21.91.131.52 0:0:0:0:0:ffff:155b:8334
21.91.131.53 0:0:0:0:0:ffff:155b:8335
21.91.131.54 0:0:0:0:0:ffff:155b:8336
21.91.131.55 0:0:0:0:0:ffff:155b:8337
21.91.131.56 0:0:0:0:0:ffff:155b:8338
21.91.131.57 0:0:0:0:0:ffff:155b:8339
21.91.131.58 0:0:0:0:0:ffff:155b:833a
21.91.131.59 0:0:0:0:0:ffff:155b:833b
21.91.131.60 0:0:0:0:0:ffff:155b:833c


21.91.131.61 0:0:0:0:0:ffff:155b:833d
21.91.131.62 0:0:0:0:0:ffff:155b:833e
21.91.131.63 0:0:0:0:0:ffff:155b:833f
21.91.131.64 0:0:0:0:0:ffff:155b:8340
21.91.131.65 0:0:0:0:0:ffff:155b:8341
21.91.131.66 0:0:0:0:0:ffff:155b:8342
21.91.131.67 0:0:0:0:0:ffff:155b:8343
21.91.131.68 0:0:0:0:0:ffff:155b:8344
21.91.131.69 0:0:0:0:0:ffff:155b:8345
21.91.131.70 0:0:0:0:0:ffff:155b:8346
21.91.131.71 0:0:0:0:0:ffff:155b:8347
21.91.131.72 0:0:0:0:0:ffff:155b:8348
21.91.131.73 0:0:0:0:0:ffff:155b:8349
21.91.131.74 0:0:0:0:0:ffff:155b:834a
21.91.131.75 0:0:0:0:0:ffff:155b:834b
21.91.131.76 0:0:0:0:0:ffff:155b:834c
21.91.131.77 0:0:0:0:0:ffff:155b:834d
21.91.131.78 0:0:0:0:0:ffff:155b:834e
21.91.131.79 0:0:0:0:0:ffff:155b:834f
21.91.131.80 0:0:0:0:0:ffff:155b:8350
21.91.131.81 0:0:0:0:0:ffff:155b:8351
21.91.131.82 0:0:0:0:0:ffff:155b:8352
21.91.131.83 0:0:0:0:0:ffff:155b:8353
21.91.131.84 0:0:0:0:0:ffff:155b:8354
21.91.131.85 0:0:0:0:0:ffff:155b:8355
21.91.131.86 0:0:0:0:0:ffff:155b:8356
21.91.131.87 0:0:0:0:0:ffff:155b:8357
21.91.131.88 0:0:0:0:0:ffff:155b:8358
21.91.131.89 0:0:0:0:0:ffff:155b:8359
21.91.131.90 0:0:0:0:0:ffff:155b:835a
21.91.131.91 0:0:0:0:0:ffff:155b:835b
21.91.131.92 0:0:0:0:0:ffff:155b:835c
21.91.131.93 0:0:0:0:0:ffff:155b:835d
21.91.131.94 0:0:0:0:0:ffff:155b:835e
21.91.131.95 0:0:0:0:0:ffff:155b:835f
21.91.131.96 0:0:0:0:0:ffff:155b:8360
21.91.131.97 0:0:0:0:0:ffff:155b:8361
21.91.131.98 0:0:0:0:0:ffff:155b:8362
21.91.131.99 0:0:0:0:0:ffff:155b:8363
21.91.131.100 0:0:0:0:0:ffff:155b:8364
21.91.131.101 0:0:0:0:0:ffff:155b:8365
21.91.131.102 0:0:0:0:0:ffff:155b:8366
21.91.131.103 0:0:0:0:0:ffff:155b:8367
21.91.131.104 0:0:0:0:0:ffff:155b:8368
21.91.131.105 0:0:0:0:0:ffff:155b:8369
21.91.131.106 0:0:0:0:0:ffff:155b:836a
21.91.131.107 0:0:0:0:0:ffff:155b:836b
21.91.131.108 0:0:0:0:0:ffff:155b:836c
21.91.131.109 0:0:0:0:0:ffff:155b:836d
21.91.131.110 0:0:0:0:0:ffff:155b:836e
21.91.131.111 0:0:0:0:0:ffff:155b:836f
21.91.131.112 0:0:0:0:0:ffff:155b:8370
21.91.131.113 0:0:0:0:0:ffff:155b:8371
21.91.131.114 0:0:0:0:0:ffff:155b:8372
21.91.131.115 0:0:0:0:0:ffff:155b:8373
21.91.131.116 0:0:0:0:0:ffff:155b:8374
21.91.131.117 0:0:0:0:0:ffff:155b:8375
21.91.131.118 0:0:0:0:0:ffff:155b:8376
21.91.131.119 0:0:0:0:0:ffff:155b:8377
21.91.131.120 0:0:0:0:0:ffff:155b:8378


21.91.131.121 0:0:0:0:0:ffff:155b:8379
21.91.131.122 0:0:0:0:0:ffff:155b:837a
21.91.131.123 0:0:0:0:0:ffff:155b:837b
21.91.131.124 0:0:0:0:0:ffff:155b:837c
21.91.131.125 0:0:0:0:0:ffff:155b:837d
21.91.131.126 0:0:0:0:0:ffff:155b:837e
21.91.131.127 0:0:0:0:0:ffff:155b:837f
21.91.131.128 0:0:0:0:0:ffff:155b:8380
21.91.131.129 0:0:0:0:0:ffff:155b:8381
21.91.131.130 0:0:0:0:0:ffff:155b:8382
21.91.131.131 0:0:0:0:0:ffff:155b:8383
21.91.131.132 0:0:0:0:0:ffff:155b:8384
21.91.131.133 0:0:0:0:0:ffff:155b:8385
21.91.131.134 0:0:0:0:0:ffff:155b:8386
21.91.131.135 0:0:0:0:0:ffff:155b:8387
21.91.131.136 0:0:0:0:0:ffff:155b:8388
21.91.131.137 0:0:0:0:0:ffff:155b:8389
21.91.131.138 0:0:0:0:0:ffff:155b:838a
21.91.131.139 0:0:0:0:0:ffff:155b:838b
21.91.131.140 0:0:0:0:0:ffff:155b:838c
21.91.131.141 0:0:0:0:0:ffff:155b:838d
21.91.131.142 0:0:0:0:0:ffff:155b:838e
21.91.131.143 0:0:0:0:0:ffff:155b:838f
21.91.131.144 0:0:0:0:0:ffff:155b:8390
21.91.131.145 0:0:0:0:0:ffff:155b:8391
21.91.131.146 0:0:0:0:0:ffff:155b:8392
21.91.131.147 0:0:0:0:0:ffff:155b:8393
21.91.131.148 0:0:0:0:0:ffff:155b:8394
21.91.131.149 0:0:0:0:0:ffff:155b:8395
21.91.131.150 0:0:0:0:0:ffff:155b:8396
21.91.131.151 0:0:0:0:0:ffff:155b:8397
21.91.131.152 0:0:0:0:0:ffff:155b:8398
21.91.131.153 0:0:0:0:0:ffff:155b:8399
21.91.131.154 0:0:0:0:0:ffff:155b:839a
21.91.131.155 0:0:0:0:0:ffff:155b:839b
21.91.131.156 0:0:0:0:0:ffff:155b:839c
21.91.131.157 0:0:0:0:0:ffff:155b:839d
21.91.131.158 0:0:0:0:0:ffff:155b:839e
21.91.131.159 0:0:0:0:0:ffff:155b:839f
21.91.131.160 0:0:0:0:0:ffff:155b:83a0
21.91.131.161 0:0:0:0:0:ffff:155b:83a1
21.91.131.162 0:0:0:0:0:ffff:155b:83a2
21.91.131.163 0:0:0:0:0:ffff:155b:83a3
21.91.131.164 0:0:0:0:0:ffff:155b:83a4
21.91.131.165 0:0:0:0:0:ffff:155b:83a5
21.91.131.166 0:0:0:0:0:ffff:155b:83a6
21.91.131.167 0:0:0:0:0:ffff:155b:83a7
21.91.131.168 0:0:0:0:0:ffff:155b:83a8
21.91.131.169 0:0:0:0:0:ffff:155b:83a9
21.91.131.170 0:0:0:0:0:ffff:155b:83aa
21.91.131.171 0:0:0:0:0:ffff:155b:83ab
21.91.131.172 0:0:0:0:0:ffff:155b:83ac
21.91.131.173 0:0:0:0:0:ffff:155b:83ad
21.91.131.174 0:0:0:0:0:ffff:155b:83ae
21.91.131.175 0:0:0:0:0:ffff:155b:83af
21.91.131.176 0:0:0:0:0:ffff:155b:83b0
21.91.131.177 0:0:0:0:0:ffff:155b:83b1
21.91.131.178 0:0:0:0:0:ffff:155b:83b2
21.91.131.179 0:0:0:0:0:ffff:155b:83b3
21.91.131.180 0:0:0:0:0:ffff:155b:83b4


21.91.131.181 0:0:0:0:0:ffff:155b:83b5
21.91.131.182 0:0:0:0:0:ffff:155b:83b6
21.91.131.183 0:0:0:0:0:ffff:155b:83b7
21.91.131.184 0:0:0:0:0:ffff:155b:83b8
21.91.131.185 0:0:0:0:0:ffff:155b:83b9
21.91.131.186 0:0:0:0:0:ffff:155b:83ba
21.91.131.187 0:0:0:0:0:ffff:155b:83bb
21.91.131.188 0:0:0:0:0:ffff:155b:83bc
21.91.131.189 0:0:0:0:0:ffff:155b:83bd
21.91.131.190 0:0:0:0:0:ffff:155b:83be
21.91.131.191 0:0:0:0:0:ffff:155b:83bf
21.91.131.192 0:0:0:0:0:ffff:155b:83c0
21.91.131.193 0:0:0:0:0:ffff:155b:83c1
21.91.131.194 0:0:0:0:0:ffff:155b:83c2
21.91.131.195 0:0:0:0:0:ffff:155b:83c3
21.91.131.196 0:0:0:0:0:ffff:155b:83c4
21.91.131.197 0:0:0:0:0:ffff:155b:83c5
21.91.131.198 0:0:0:0:0:ffff:155b:83c6
21.91.131.199 0:0:0:0:0:ffff:155b:83c7
21.91.131.200 0:0:0:0:0:ffff:155b:83c8
21.91.131.201 0:0:0:0:0:ffff:155b:83c9
21.91.131.202 0:0:0:0:0:ffff:155b:83ca
21.91.131.203 0:0:0:0:0:ffff:155b:83cb
21.91.131.204 0:0:0:0:0:ffff:155b:83cc
21.91.131.205 0:0:0:0:0:ffff:155b:83cd
21.91.131.206 0:0:0:0:0:ffff:155b:83ce
21.91.131.207 0:0:0:0:0:ffff:155b:83cf
21.91.131.208 0:0:0:0:0:ffff:155b:83d0
21.91.131.209 0:0:0:0:0:ffff:155b:83d1
21.91.131.210 0:0:0:0:0:ffff:155b:83d2
21.91.131.211 0:0:0:0:0:ffff:155b:83d3
21.91.131.212 0:0:0:0:0:ffff:155b:83d4
21.91.131.213 0:0:0:0:0:ffff:155b:83d5
21.91.131.214 0:0:0:0:0:ffff:155b:83d6
21.91.131.215 0:0:0:0:0:ffff:155b:83d7
21.91.131.216 0:0:0:0:0:ffff:155b:83d8
21.91.131.217 0:0:0:0:0:ffff:155b:83d9
21.91.131.218 0:0:0:0:0:ffff:155b:83da
21.91.131.219 0:0:0:0:0:ffff:155b:83db
21.91.131.220 0:0:0:0:0:ffff:155b:83dc
21.91.131.221 0:0:0:0:0:ffff:155b:83dd
21.91.131.222 0:0:0:0:0:ffff:155b:83de
21.91.131.223 0:0:0:0:0:ffff:155b:83df
21.91.131.224 0:0:0:0:0:ffff:155b:83e0
21.91.131.225 0:0:0:0:0:ffff:155b:83e1
21.91.131.226 0:0:0:0:0:ffff:155b:83e2
21.91.131.227 0:0:0:0:0:ffff:155b:83e3
21.91.131.228 0:0:0:0:0:ffff:155b:83e4
21.91.131.229 0:0:0:0:0:ffff:155b:83e5
21.91.131.230 0:0:0:0:0:ffff:155b:83e6
21.91.131.231 0:0:0:0:0:ffff:155b:83e7
21.91.131.232 0:0:0:0:0:ffff:155b:83e8
21.91.131.233 0:0:0:0:0:ffff:155b:83e9
21.91.131.234 0:0:0:0:0:ffff:155b:83ea
21.91.131.235 0:0:0:0:0:ffff:155b:83eb
21.91.131.236 0:0:0:0:0:ffff:155b:83ec
21.91.131.237 0:0:0:0:0:ffff:155b:83ed
21.91.131.238 0:0:0:0:0:ffff:155b:83ee
21.91.131.239 0:0:0:0:0:ffff:155b:83ef
21.91.131.240 0:0:0:0:0:ffff:155b:83f0
21.91.131.241 0:0:0:0:0:ffff:155b:83f1
21.91.131.242 0:0:0:0:0:ffff:155b:83f2
21.91.131.243 0:0:0:0:0:ffff:155b:83f3
21.91.131.244 0:0:0:0:0:ffff:155b:83f4
21.91.131.245 0:0:0:0:0:ffff:155b:83f5
21.91.131.246 0:0:0:0:0:ffff:155b:83f6
21.91.131.247 0:0:0:0:0:ffff:155b:83f7
21.91.131.248 0:0:0:0:0:ffff:155b:83f8
21.91.131.249 0:0:0:0:0:ffff:155b:83f9
21.91.131.250 0:0:0:0:0:ffff:155b:83fa
21.91.131.251 0:0:0:0:0:ffff:155b:83fb
21.91.131.252 0:0:0:0:0:ffff:155b:83fc
21.91.131.253 0:0:0:0:0:ffff:155b:83fd
21.91.131.254 0:0:0:0:0:ffff:155b:83fe
21.91.131.255 0:0:0:0:0:ffff:155b:83ff


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.