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
65.121.100.1 0:0:0:0:0:ffff:4179:6401
65.121.100.2 0:0:0:0:0:ffff:4179:6402
65.121.100.3 0:0:0:0:0:ffff:4179:6403
65.121.100.4 0:0:0:0:0:ffff:4179:6404
65.121.100.5 0:0:0:0:0:ffff:4179:6405
65.121.100.6 0:0:0:0:0:ffff:4179:6406
65.121.100.7 0:0:0:0:0:ffff:4179:6407
65.121.100.8 0:0:0:0:0:ffff:4179:6408
65.121.100.9 0:0:0:0:0:ffff:4179:6409
65.121.100.10 0:0:0:0:0:ffff:4179:640a
65.121.100.11 0:0:0:0:0:ffff:4179:640b
65.121.100.12 0:0:0:0:0:ffff:4179:640c
65.121.100.13 0:0:0:0:0:ffff:4179:640d
65.121.100.14 0:0:0:0:0:ffff:4179:640e
65.121.100.15 0:0:0:0:0:ffff:4179:640f
65.121.100.16 0:0:0:0:0:ffff:4179:6410
65.121.100.17 0:0:0:0:0:ffff:4179:6411
65.121.100.18 0:0:0:0:0:ffff:4179:6412
65.121.100.19 0:0:0:0:0:ffff:4179:6413
65.121.100.20 0:0:0:0:0:ffff:4179:6414
65.121.100.21 0:0:0:0:0:ffff:4179:6415
65.121.100.22 0:0:0:0:0:ffff:4179:6416
65.121.100.23 0:0:0:0:0:ffff:4179:6417
65.121.100.24 0:0:0:0:0:ffff:4179:6418
65.121.100.25 0:0:0:0:0:ffff:4179:6419
65.121.100.26 0:0:0:0:0:ffff:4179:641a
65.121.100.27 0:0:0:0:0:ffff:4179:641b
65.121.100.28 0:0:0:0:0:ffff:4179:641c
65.121.100.29 0:0:0:0:0:ffff:4179:641d
65.121.100.30 0:0:0:0:0:ffff:4179:641e
65.121.100.31 0:0:0:0:0:ffff:4179:641f
65.121.100.32 0:0:0:0:0:ffff:4179:6420
65.121.100.33 0:0:0:0:0:ffff:4179:6421
65.121.100.34 0:0:0:0:0:ffff:4179:6422
65.121.100.35 0:0:0:0:0:ffff:4179:6423
65.121.100.36 0:0:0:0:0:ffff:4179:6424
65.121.100.37 0:0:0:0:0:ffff:4179:6425
65.121.100.38 0:0:0:0:0:ffff:4179:6426
65.121.100.39 0:0:0:0:0:ffff:4179:6427
65.121.100.40 0:0:0:0:0:ffff:4179:6428
65.121.100.41 0:0:0:0:0:ffff:4179:6429
65.121.100.42 0:0:0:0:0:ffff:4179:642a
65.121.100.43 0:0:0:0:0:ffff:4179:642b
65.121.100.44 0:0:0:0:0:ffff:4179:642c
65.121.100.45 0:0:0:0:0:ffff:4179:642d
65.121.100.46 0:0:0:0:0:ffff:4179:642e
65.121.100.47 0:0:0:0:0:ffff:4179:642f
65.121.100.48 0:0:0:0:0:ffff:4179:6430
65.121.100.49 0:0:0:0:0:ffff:4179:6431
65.121.100.50 0:0:0:0:0:ffff:4179:6432
65.121.100.51 0:0:0:0:0:ffff:4179:6433
65.121.100.52 0:0:0:0:0:ffff:4179:6434
65.121.100.53 0:0:0:0:0:ffff:4179:6435
65.121.100.54 0:0:0:0:0:ffff:4179:6436
65.121.100.55 0:0:0:0:0:ffff:4179:6437
65.121.100.56 0:0:0:0:0:ffff:4179:6438
65.121.100.57 0:0:0:0:0:ffff:4179:6439
65.121.100.58 0:0:0:0:0:ffff:4179:643a
65.121.100.59 0:0:0:0:0:ffff:4179:643b
65.121.100.60 0:0:0:0:0:ffff:4179:643c


65.121.100.61 0:0:0:0:0:ffff:4179:643d
65.121.100.62 0:0:0:0:0:ffff:4179:643e
65.121.100.63 0:0:0:0:0:ffff:4179:643f
65.121.100.64 0:0:0:0:0:ffff:4179:6440
65.121.100.65 0:0:0:0:0:ffff:4179:6441
65.121.100.66 0:0:0:0:0:ffff:4179:6442
65.121.100.67 0:0:0:0:0:ffff:4179:6443
65.121.100.68 0:0:0:0:0:ffff:4179:6444
65.121.100.69 0:0:0:0:0:ffff:4179:6445
65.121.100.70 0:0:0:0:0:ffff:4179:6446
65.121.100.71 0:0:0:0:0:ffff:4179:6447
65.121.100.72 0:0:0:0:0:ffff:4179:6448
65.121.100.73 0:0:0:0:0:ffff:4179:6449
65.121.100.74 0:0:0:0:0:ffff:4179:644a
65.121.100.75 0:0:0:0:0:ffff:4179:644b
65.121.100.76 0:0:0:0:0:ffff:4179:644c
65.121.100.77 0:0:0:0:0:ffff:4179:644d
65.121.100.78 0:0:0:0:0:ffff:4179:644e
65.121.100.79 0:0:0:0:0:ffff:4179:644f
65.121.100.80 0:0:0:0:0:ffff:4179:6450
65.121.100.81 0:0:0:0:0:ffff:4179:6451
65.121.100.82 0:0:0:0:0:ffff:4179:6452
65.121.100.83 0:0:0:0:0:ffff:4179:6453
65.121.100.84 0:0:0:0:0:ffff:4179:6454
65.121.100.85 0:0:0:0:0:ffff:4179:6455
65.121.100.86 0:0:0:0:0:ffff:4179:6456
65.121.100.87 0:0:0:0:0:ffff:4179:6457
65.121.100.88 0:0:0:0:0:ffff:4179:6458
65.121.100.89 0:0:0:0:0:ffff:4179:6459
65.121.100.90 0:0:0:0:0:ffff:4179:645a
65.121.100.91 0:0:0:0:0:ffff:4179:645b
65.121.100.92 0:0:0:0:0:ffff:4179:645c
65.121.100.93 0:0:0:0:0:ffff:4179:645d
65.121.100.94 0:0:0:0:0:ffff:4179:645e
65.121.100.95 0:0:0:0:0:ffff:4179:645f
65.121.100.96 0:0:0:0:0:ffff:4179:6460
65.121.100.97 0:0:0:0:0:ffff:4179:6461
65.121.100.98 0:0:0:0:0:ffff:4179:6462
65.121.100.99 0:0:0:0:0:ffff:4179:6463
65.121.100.100 0:0:0:0:0:ffff:4179:6464
65.121.100.101 0:0:0:0:0:ffff:4179:6465
65.121.100.102 0:0:0:0:0:ffff:4179:6466
65.121.100.103 0:0:0:0:0:ffff:4179:6467
65.121.100.104 0:0:0:0:0:ffff:4179:6468
65.121.100.105 0:0:0:0:0:ffff:4179:6469
65.121.100.106 0:0:0:0:0:ffff:4179:646a
65.121.100.107 0:0:0:0:0:ffff:4179:646b
65.121.100.108 0:0:0:0:0:ffff:4179:646c
65.121.100.109 0:0:0:0:0:ffff:4179:646d
65.121.100.110 0:0:0:0:0:ffff:4179:646e
65.121.100.111 0:0:0:0:0:ffff:4179:646f
65.121.100.112 0:0:0:0:0:ffff:4179:6470
65.121.100.113 0:0:0:0:0:ffff:4179:6471
65.121.100.114 0:0:0:0:0:ffff:4179:6472
65.121.100.115 0:0:0:0:0:ffff:4179:6473
65.121.100.116 0:0:0:0:0:ffff:4179:6474
65.121.100.117 0:0:0:0:0:ffff:4179:6475
65.121.100.118 0:0:0:0:0:ffff:4179:6476
65.121.100.119 0:0:0:0:0:ffff:4179:6477
65.121.100.120 0:0:0:0:0:ffff:4179:6478


65.121.100.121 0:0:0:0:0:ffff:4179:6479
65.121.100.122 0:0:0:0:0:ffff:4179:647a
65.121.100.123 0:0:0:0:0:ffff:4179:647b
65.121.100.124 0:0:0:0:0:ffff:4179:647c
65.121.100.125 0:0:0:0:0:ffff:4179:647d
65.121.100.126 0:0:0:0:0:ffff:4179:647e
65.121.100.127 0:0:0:0:0:ffff:4179:647f
65.121.100.128 0:0:0:0:0:ffff:4179:6480
65.121.100.129 0:0:0:0:0:ffff:4179:6481
65.121.100.130 0:0:0:0:0:ffff:4179:6482
65.121.100.131 0:0:0:0:0:ffff:4179:6483
65.121.100.132 0:0:0:0:0:ffff:4179:6484
65.121.100.133 0:0:0:0:0:ffff:4179:6485
65.121.100.134 0:0:0:0:0:ffff:4179:6486
65.121.100.135 0:0:0:0:0:ffff:4179:6487
65.121.100.136 0:0:0:0:0:ffff:4179:6488
65.121.100.137 0:0:0:0:0:ffff:4179:6489
65.121.100.138 0:0:0:0:0:ffff:4179:648a
65.121.100.139 0:0:0:0:0:ffff:4179:648b
65.121.100.140 0:0:0:0:0:ffff:4179:648c
65.121.100.141 0:0:0:0:0:ffff:4179:648d
65.121.100.142 0:0:0:0:0:ffff:4179:648e
65.121.100.143 0:0:0:0:0:ffff:4179:648f
65.121.100.144 0:0:0:0:0:ffff:4179:6490
65.121.100.145 0:0:0:0:0:ffff:4179:6491
65.121.100.146 0:0:0:0:0:ffff:4179:6492
65.121.100.147 0:0:0:0:0:ffff:4179:6493
65.121.100.148 0:0:0:0:0:ffff:4179:6494
65.121.100.149 0:0:0:0:0:ffff:4179:6495
65.121.100.150 0:0:0:0:0:ffff:4179:6496
65.121.100.151 0:0:0:0:0:ffff:4179:6497
65.121.100.152 0:0:0:0:0:ffff:4179:6498
65.121.100.153 0:0:0:0:0:ffff:4179:6499
65.121.100.154 0:0:0:0:0:ffff:4179:649a
65.121.100.155 0:0:0:0:0:ffff:4179:649b
65.121.100.156 0:0:0:0:0:ffff:4179:649c
65.121.100.157 0:0:0:0:0:ffff:4179:649d
65.121.100.158 0:0:0:0:0:ffff:4179:649e
65.121.100.159 0:0:0:0:0:ffff:4179:649f
65.121.100.160 0:0:0:0:0:ffff:4179:64a0
65.121.100.161 0:0:0:0:0:ffff:4179:64a1
65.121.100.162 0:0:0:0:0:ffff:4179:64a2
65.121.100.163 0:0:0:0:0:ffff:4179:64a3
65.121.100.164 0:0:0:0:0:ffff:4179:64a4
65.121.100.165 0:0:0:0:0:ffff:4179:64a5
65.121.100.166 0:0:0:0:0:ffff:4179:64a6
65.121.100.167 0:0:0:0:0:ffff:4179:64a7
65.121.100.168 0:0:0:0:0:ffff:4179:64a8
65.121.100.169 0:0:0:0:0:ffff:4179:64a9
65.121.100.170 0:0:0:0:0:ffff:4179:64aa
65.121.100.171 0:0:0:0:0:ffff:4179:64ab
65.121.100.172 0:0:0:0:0:ffff:4179:64ac
65.121.100.173 0:0:0:0:0:ffff:4179:64ad
65.121.100.174 0:0:0:0:0:ffff:4179:64ae
65.121.100.175 0:0:0:0:0:ffff:4179:64af
65.121.100.176 0:0:0:0:0:ffff:4179:64b0
65.121.100.177 0:0:0:0:0:ffff:4179:64b1
65.121.100.178 0:0:0:0:0:ffff:4179:64b2
65.121.100.179 0:0:0:0:0:ffff:4179:64b3
65.121.100.180 0:0:0:0:0:ffff:4179:64b4


65.121.100.181 0:0:0:0:0:ffff:4179:64b5
65.121.100.182 0:0:0:0:0:ffff:4179:64b6
65.121.100.183 0:0:0:0:0:ffff:4179:64b7
65.121.100.184 0:0:0:0:0:ffff:4179:64b8
65.121.100.185 0:0:0:0:0:ffff:4179:64b9
65.121.100.186 0:0:0:0:0:ffff:4179:64ba
65.121.100.187 0:0:0:0:0:ffff:4179:64bb
65.121.100.188 0:0:0:0:0:ffff:4179:64bc
65.121.100.189 0:0:0:0:0:ffff:4179:64bd
65.121.100.190 0:0:0:0:0:ffff:4179:64be
65.121.100.191 0:0:0:0:0:ffff:4179:64bf
65.121.100.192 0:0:0:0:0:ffff:4179:64c0
65.121.100.193 0:0:0:0:0:ffff:4179:64c1
65.121.100.194 0:0:0:0:0:ffff:4179:64c2
65.121.100.195 0:0:0:0:0:ffff:4179:64c3
65.121.100.196 0:0:0:0:0:ffff:4179:64c4
65.121.100.197 0:0:0:0:0:ffff:4179:64c5
65.121.100.198 0:0:0:0:0:ffff:4179:64c6
65.121.100.199 0:0:0:0:0:ffff:4179:64c7
65.121.100.200 0:0:0:0:0:ffff:4179:64c8
65.121.100.201 0:0:0:0:0:ffff:4179:64c9
65.121.100.202 0:0:0:0:0:ffff:4179:64ca
65.121.100.203 0:0:0:0:0:ffff:4179:64cb
65.121.100.204 0:0:0:0:0:ffff:4179:64cc
65.121.100.205 0:0:0:0:0:ffff:4179:64cd
65.121.100.206 0:0:0:0:0:ffff:4179:64ce
65.121.100.207 0:0:0:0:0:ffff:4179:64cf
65.121.100.208 0:0:0:0:0:ffff:4179:64d0
65.121.100.209 0:0:0:0:0:ffff:4179:64d1
65.121.100.210 0:0:0:0:0:ffff:4179:64d2
65.121.100.211 0:0:0:0:0:ffff:4179:64d3
65.121.100.212 0:0:0:0:0:ffff:4179:64d4
65.121.100.213 0:0:0:0:0:ffff:4179:64d5
65.121.100.214 0:0:0:0:0:ffff:4179:64d6
65.121.100.215 0:0:0:0:0:ffff:4179:64d7
65.121.100.216 0:0:0:0:0:ffff:4179:64d8
65.121.100.217 0:0:0:0:0:ffff:4179:64d9
65.121.100.218 0:0:0:0:0:ffff:4179:64da
65.121.100.219 0:0:0:0:0:ffff:4179:64db
65.121.100.220 0:0:0:0:0:ffff:4179:64dc
65.121.100.221 0:0:0:0:0:ffff:4179:64dd
65.121.100.222 0:0:0:0:0:ffff:4179:64de
65.121.100.223 0:0:0:0:0:ffff:4179:64df
65.121.100.224 0:0:0:0:0:ffff:4179:64e0
65.121.100.225 0:0:0:0:0:ffff:4179:64e1
65.121.100.226 0:0:0:0:0:ffff:4179:64e2
65.121.100.227 0:0:0:0:0:ffff:4179:64e3
65.121.100.228 0:0:0:0:0:ffff:4179:64e4
65.121.100.229 0:0:0:0:0:ffff:4179:64e5
65.121.100.230 0:0:0:0:0:ffff:4179:64e6
65.121.100.231 0:0:0:0:0:ffff:4179:64e7
65.121.100.232 0:0:0:0:0:ffff:4179:64e8
65.121.100.233 0:0:0:0:0:ffff:4179:64e9
65.121.100.234 0:0:0:0:0:ffff:4179:64ea
65.121.100.235 0:0:0:0:0:ffff:4179:64eb
65.121.100.236 0:0:0:0:0:ffff:4179:64ec
65.121.100.237 0:0:0:0:0:ffff:4179:64ed
65.121.100.238 0:0:0:0:0:ffff:4179:64ee
65.121.100.239 0:0:0:0:0:ffff:4179:64ef
65.121.100.240 0:0:0:0:0:ffff:4179:64f0
65.121.100.241 0:0:0:0:0:ffff:4179:64f1
65.121.100.242 0:0:0:0:0:ffff:4179:64f2
65.121.100.243 0:0:0:0:0:ffff:4179:64f3
65.121.100.244 0:0:0:0:0:ffff:4179:64f4
65.121.100.245 0:0:0:0:0:ffff:4179:64f5
65.121.100.246 0:0:0:0:0:ffff:4179:64f6
65.121.100.247 0:0:0:0:0:ffff:4179:64f7
65.121.100.248 0:0:0:0:0:ffff:4179:64f8
65.121.100.249 0:0:0:0:0:ffff:4179:64f9
65.121.100.250 0:0:0:0:0:ffff:4179:64fa
65.121.100.251 0:0:0:0:0:ffff:4179:64fb
65.121.100.252 0:0:0:0:0:ffff:4179:64fc
65.121.100.253 0:0:0:0:0:ffff:4179:64fd
65.121.100.254 0:0:0:0:0:ffff:4179:64fe
65.121.100.255 0:0:0:0:0:ffff:4179:64ff


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.