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
100.203.123.1 0:0:0:0:0:ffff:64cb:7b01
100.203.123.2 0:0:0:0:0:ffff:64cb:7b02
100.203.123.3 0:0:0:0:0:ffff:64cb:7b03
100.203.123.4 0:0:0:0:0:ffff:64cb:7b04
100.203.123.5 0:0:0:0:0:ffff:64cb:7b05
100.203.123.6 0:0:0:0:0:ffff:64cb:7b06
100.203.123.7 0:0:0:0:0:ffff:64cb:7b07
100.203.123.8 0:0:0:0:0:ffff:64cb:7b08
100.203.123.9 0:0:0:0:0:ffff:64cb:7b09
100.203.123.10 0:0:0:0:0:ffff:64cb:7b0a
100.203.123.11 0:0:0:0:0:ffff:64cb:7b0b
100.203.123.12 0:0:0:0:0:ffff:64cb:7b0c
100.203.123.13 0:0:0:0:0:ffff:64cb:7b0d
100.203.123.14 0:0:0:0:0:ffff:64cb:7b0e
100.203.123.15 0:0:0:0:0:ffff:64cb:7b0f
100.203.123.16 0:0:0:0:0:ffff:64cb:7b10
100.203.123.17 0:0:0:0:0:ffff:64cb:7b11
100.203.123.18 0:0:0:0:0:ffff:64cb:7b12
100.203.123.19 0:0:0:0:0:ffff:64cb:7b13
100.203.123.20 0:0:0:0:0:ffff:64cb:7b14
100.203.123.21 0:0:0:0:0:ffff:64cb:7b15
100.203.123.22 0:0:0:0:0:ffff:64cb:7b16
100.203.123.23 0:0:0:0:0:ffff:64cb:7b17
100.203.123.24 0:0:0:0:0:ffff:64cb:7b18
100.203.123.25 0:0:0:0:0:ffff:64cb:7b19
100.203.123.26 0:0:0:0:0:ffff:64cb:7b1a
100.203.123.27 0:0:0:0:0:ffff:64cb:7b1b
100.203.123.28 0:0:0:0:0:ffff:64cb:7b1c
100.203.123.29 0:0:0:0:0:ffff:64cb:7b1d
100.203.123.30 0:0:0:0:0:ffff:64cb:7b1e
100.203.123.31 0:0:0:0:0:ffff:64cb:7b1f
100.203.123.32 0:0:0:0:0:ffff:64cb:7b20
100.203.123.33 0:0:0:0:0:ffff:64cb:7b21
100.203.123.34 0:0:0:0:0:ffff:64cb:7b22
100.203.123.35 0:0:0:0:0:ffff:64cb:7b23
100.203.123.36 0:0:0:0:0:ffff:64cb:7b24
100.203.123.37 0:0:0:0:0:ffff:64cb:7b25
100.203.123.38 0:0:0:0:0:ffff:64cb:7b26
100.203.123.39 0:0:0:0:0:ffff:64cb:7b27
100.203.123.40 0:0:0:0:0:ffff:64cb:7b28
100.203.123.41 0:0:0:0:0:ffff:64cb:7b29
100.203.123.42 0:0:0:0:0:ffff:64cb:7b2a
100.203.123.43 0:0:0:0:0:ffff:64cb:7b2b
100.203.123.44 0:0:0:0:0:ffff:64cb:7b2c
100.203.123.45 0:0:0:0:0:ffff:64cb:7b2d
100.203.123.46 0:0:0:0:0:ffff:64cb:7b2e
100.203.123.47 0:0:0:0:0:ffff:64cb:7b2f
100.203.123.48 0:0:0:0:0:ffff:64cb:7b30
100.203.123.49 0:0:0:0:0:ffff:64cb:7b31
100.203.123.50 0:0:0:0:0:ffff:64cb:7b32
100.203.123.51 0:0:0:0:0:ffff:64cb:7b33
100.203.123.52 0:0:0:0:0:ffff:64cb:7b34
100.203.123.53 0:0:0:0:0:ffff:64cb:7b35
100.203.123.54 0:0:0:0:0:ffff:64cb:7b36
100.203.123.55 0:0:0:0:0:ffff:64cb:7b37
100.203.123.56 0:0:0:0:0:ffff:64cb:7b38
100.203.123.57 0:0:0:0:0:ffff:64cb:7b39
100.203.123.58 0:0:0:0:0:ffff:64cb:7b3a
100.203.123.59 0:0:0:0:0:ffff:64cb:7b3b
100.203.123.60 0:0:0:0:0:ffff:64cb:7b3c


100.203.123.61 0:0:0:0:0:ffff:64cb:7b3d
100.203.123.62 0:0:0:0:0:ffff:64cb:7b3e
100.203.123.63 0:0:0:0:0:ffff:64cb:7b3f
100.203.123.64 0:0:0:0:0:ffff:64cb:7b40
100.203.123.65 0:0:0:0:0:ffff:64cb:7b41
100.203.123.66 0:0:0:0:0:ffff:64cb:7b42
100.203.123.67 0:0:0:0:0:ffff:64cb:7b43
100.203.123.68 0:0:0:0:0:ffff:64cb:7b44
100.203.123.69 0:0:0:0:0:ffff:64cb:7b45
100.203.123.70 0:0:0:0:0:ffff:64cb:7b46
100.203.123.71 0:0:0:0:0:ffff:64cb:7b47
100.203.123.72 0:0:0:0:0:ffff:64cb:7b48
100.203.123.73 0:0:0:0:0:ffff:64cb:7b49
100.203.123.74 0:0:0:0:0:ffff:64cb:7b4a
100.203.123.75 0:0:0:0:0:ffff:64cb:7b4b
100.203.123.76 0:0:0:0:0:ffff:64cb:7b4c
100.203.123.77 0:0:0:0:0:ffff:64cb:7b4d
100.203.123.78 0:0:0:0:0:ffff:64cb:7b4e
100.203.123.79 0:0:0:0:0:ffff:64cb:7b4f
100.203.123.80 0:0:0:0:0:ffff:64cb:7b50
100.203.123.81 0:0:0:0:0:ffff:64cb:7b51
100.203.123.82 0:0:0:0:0:ffff:64cb:7b52
100.203.123.83 0:0:0:0:0:ffff:64cb:7b53
100.203.123.84 0:0:0:0:0:ffff:64cb:7b54
100.203.123.85 0:0:0:0:0:ffff:64cb:7b55
100.203.123.86 0:0:0:0:0:ffff:64cb:7b56
100.203.123.87 0:0:0:0:0:ffff:64cb:7b57
100.203.123.88 0:0:0:0:0:ffff:64cb:7b58
100.203.123.89 0:0:0:0:0:ffff:64cb:7b59
100.203.123.90 0:0:0:0:0:ffff:64cb:7b5a
100.203.123.91 0:0:0:0:0:ffff:64cb:7b5b
100.203.123.92 0:0:0:0:0:ffff:64cb:7b5c
100.203.123.93 0:0:0:0:0:ffff:64cb:7b5d
100.203.123.94 0:0:0:0:0:ffff:64cb:7b5e
100.203.123.95 0:0:0:0:0:ffff:64cb:7b5f
100.203.123.96 0:0:0:0:0:ffff:64cb:7b60
100.203.123.97 0:0:0:0:0:ffff:64cb:7b61
100.203.123.98 0:0:0:0:0:ffff:64cb:7b62
100.203.123.99 0:0:0:0:0:ffff:64cb:7b63
100.203.123.100 0:0:0:0:0:ffff:64cb:7b64
100.203.123.101 0:0:0:0:0:ffff:64cb:7b65
100.203.123.102 0:0:0:0:0:ffff:64cb:7b66
100.203.123.103 0:0:0:0:0:ffff:64cb:7b67
100.203.123.104 0:0:0:0:0:ffff:64cb:7b68
100.203.123.105 0:0:0:0:0:ffff:64cb:7b69
100.203.123.106 0:0:0:0:0:ffff:64cb:7b6a
100.203.123.107 0:0:0:0:0:ffff:64cb:7b6b
100.203.123.108 0:0:0:0:0:ffff:64cb:7b6c
100.203.123.109 0:0:0:0:0:ffff:64cb:7b6d
100.203.123.110 0:0:0:0:0:ffff:64cb:7b6e
100.203.123.111 0:0:0:0:0:ffff:64cb:7b6f
100.203.123.112 0:0:0:0:0:ffff:64cb:7b70
100.203.123.113 0:0:0:0:0:ffff:64cb:7b71
100.203.123.114 0:0:0:0:0:ffff:64cb:7b72
100.203.123.115 0:0:0:0:0:ffff:64cb:7b73
100.203.123.116 0:0:0:0:0:ffff:64cb:7b74
100.203.123.117 0:0:0:0:0:ffff:64cb:7b75
100.203.123.118 0:0:0:0:0:ffff:64cb:7b76
100.203.123.119 0:0:0:0:0:ffff:64cb:7b77
100.203.123.120 0:0:0:0:0:ffff:64cb:7b78


100.203.123.121 0:0:0:0:0:ffff:64cb:7b79
100.203.123.122 0:0:0:0:0:ffff:64cb:7b7a
100.203.123.123 0:0:0:0:0:ffff:64cb:7b7b
100.203.123.124 0:0:0:0:0:ffff:64cb:7b7c
100.203.123.125 0:0:0:0:0:ffff:64cb:7b7d
100.203.123.126 0:0:0:0:0:ffff:64cb:7b7e
100.203.123.127 0:0:0:0:0:ffff:64cb:7b7f
100.203.123.128 0:0:0:0:0:ffff:64cb:7b80
100.203.123.129 0:0:0:0:0:ffff:64cb:7b81
100.203.123.130 0:0:0:0:0:ffff:64cb:7b82
100.203.123.131 0:0:0:0:0:ffff:64cb:7b83
100.203.123.132 0:0:0:0:0:ffff:64cb:7b84
100.203.123.133 0:0:0:0:0:ffff:64cb:7b85
100.203.123.134 0:0:0:0:0:ffff:64cb:7b86
100.203.123.135 0:0:0:0:0:ffff:64cb:7b87
100.203.123.136 0:0:0:0:0:ffff:64cb:7b88
100.203.123.137 0:0:0:0:0:ffff:64cb:7b89
100.203.123.138 0:0:0:0:0:ffff:64cb:7b8a
100.203.123.139 0:0:0:0:0:ffff:64cb:7b8b
100.203.123.140 0:0:0:0:0:ffff:64cb:7b8c
100.203.123.141 0:0:0:0:0:ffff:64cb:7b8d
100.203.123.142 0:0:0:0:0:ffff:64cb:7b8e
100.203.123.143 0:0:0:0:0:ffff:64cb:7b8f
100.203.123.144 0:0:0:0:0:ffff:64cb:7b90
100.203.123.145 0:0:0:0:0:ffff:64cb:7b91
100.203.123.146 0:0:0:0:0:ffff:64cb:7b92
100.203.123.147 0:0:0:0:0:ffff:64cb:7b93
100.203.123.148 0:0:0:0:0:ffff:64cb:7b94
100.203.123.149 0:0:0:0:0:ffff:64cb:7b95
100.203.123.150 0:0:0:0:0:ffff:64cb:7b96
100.203.123.151 0:0:0:0:0:ffff:64cb:7b97
100.203.123.152 0:0:0:0:0:ffff:64cb:7b98
100.203.123.153 0:0:0:0:0:ffff:64cb:7b99
100.203.123.154 0:0:0:0:0:ffff:64cb:7b9a
100.203.123.155 0:0:0:0:0:ffff:64cb:7b9b
100.203.123.156 0:0:0:0:0:ffff:64cb:7b9c
100.203.123.157 0:0:0:0:0:ffff:64cb:7b9d
100.203.123.158 0:0:0:0:0:ffff:64cb:7b9e
100.203.123.159 0:0:0:0:0:ffff:64cb:7b9f
100.203.123.160 0:0:0:0:0:ffff:64cb:7ba0
100.203.123.161 0:0:0:0:0:ffff:64cb:7ba1
100.203.123.162 0:0:0:0:0:ffff:64cb:7ba2
100.203.123.163 0:0:0:0:0:ffff:64cb:7ba3
100.203.123.164 0:0:0:0:0:ffff:64cb:7ba4
100.203.123.165 0:0:0:0:0:ffff:64cb:7ba5
100.203.123.166 0:0:0:0:0:ffff:64cb:7ba6
100.203.123.167 0:0:0:0:0:ffff:64cb:7ba7
100.203.123.168 0:0:0:0:0:ffff:64cb:7ba8
100.203.123.169 0:0:0:0:0:ffff:64cb:7ba9
100.203.123.170 0:0:0:0:0:ffff:64cb:7baa
100.203.123.171 0:0:0:0:0:ffff:64cb:7bab
100.203.123.172 0:0:0:0:0:ffff:64cb:7bac
100.203.123.173 0:0:0:0:0:ffff:64cb:7bad
100.203.123.174 0:0:0:0:0:ffff:64cb:7bae
100.203.123.175 0:0:0:0:0:ffff:64cb:7baf
100.203.123.176 0:0:0:0:0:ffff:64cb:7bb0
100.203.123.177 0:0:0:0:0:ffff:64cb:7bb1
100.203.123.178 0:0:0:0:0:ffff:64cb:7bb2
100.203.123.179 0:0:0:0:0:ffff:64cb:7bb3
100.203.123.180 0:0:0:0:0:ffff:64cb:7bb4


100.203.123.181 0:0:0:0:0:ffff:64cb:7bb5
100.203.123.182 0:0:0:0:0:ffff:64cb:7bb6
100.203.123.183 0:0:0:0:0:ffff:64cb:7bb7
100.203.123.184 0:0:0:0:0:ffff:64cb:7bb8
100.203.123.185 0:0:0:0:0:ffff:64cb:7bb9
100.203.123.186 0:0:0:0:0:ffff:64cb:7bba
100.203.123.187 0:0:0:0:0:ffff:64cb:7bbb
100.203.123.188 0:0:0:0:0:ffff:64cb:7bbc
100.203.123.189 0:0:0:0:0:ffff:64cb:7bbd
100.203.123.190 0:0:0:0:0:ffff:64cb:7bbe
100.203.123.191 0:0:0:0:0:ffff:64cb:7bbf
100.203.123.192 0:0:0:0:0:ffff:64cb:7bc0
100.203.123.193 0:0:0:0:0:ffff:64cb:7bc1
100.203.123.194 0:0:0:0:0:ffff:64cb:7bc2
100.203.123.195 0:0:0:0:0:ffff:64cb:7bc3
100.203.123.196 0:0:0:0:0:ffff:64cb:7bc4
100.203.123.197 0:0:0:0:0:ffff:64cb:7bc5
100.203.123.198 0:0:0:0:0:ffff:64cb:7bc6
100.203.123.199 0:0:0:0:0:ffff:64cb:7bc7
100.203.123.200 0:0:0:0:0:ffff:64cb:7bc8
100.203.123.201 0:0:0:0:0:ffff:64cb:7bc9
100.203.123.202 0:0:0:0:0:ffff:64cb:7bca
100.203.123.203 0:0:0:0:0:ffff:64cb:7bcb
100.203.123.204 0:0:0:0:0:ffff:64cb:7bcc
100.203.123.205 0:0:0:0:0:ffff:64cb:7bcd
100.203.123.206 0:0:0:0:0:ffff:64cb:7bce
100.203.123.207 0:0:0:0:0:ffff:64cb:7bcf
100.203.123.208 0:0:0:0:0:ffff:64cb:7bd0
100.203.123.209 0:0:0:0:0:ffff:64cb:7bd1
100.203.123.210 0:0:0:0:0:ffff:64cb:7bd2
100.203.123.211 0:0:0:0:0:ffff:64cb:7bd3
100.203.123.212 0:0:0:0:0:ffff:64cb:7bd4
100.203.123.213 0:0:0:0:0:ffff:64cb:7bd5
100.203.123.214 0:0:0:0:0:ffff:64cb:7bd6
100.203.123.215 0:0:0:0:0:ffff:64cb:7bd7
100.203.123.216 0:0:0:0:0:ffff:64cb:7bd8
100.203.123.217 0:0:0:0:0:ffff:64cb:7bd9
100.203.123.218 0:0:0:0:0:ffff:64cb:7bda
100.203.123.219 0:0:0:0:0:ffff:64cb:7bdb
100.203.123.220 0:0:0:0:0:ffff:64cb:7bdc
100.203.123.221 0:0:0:0:0:ffff:64cb:7bdd
100.203.123.222 0:0:0:0:0:ffff:64cb:7bde
100.203.123.223 0:0:0:0:0:ffff:64cb:7bdf
100.203.123.224 0:0:0:0:0:ffff:64cb:7be0
100.203.123.225 0:0:0:0:0:ffff:64cb:7be1
100.203.123.226 0:0:0:0:0:ffff:64cb:7be2
100.203.123.227 0:0:0:0:0:ffff:64cb:7be3
100.203.123.228 0:0:0:0:0:ffff:64cb:7be4
100.203.123.229 0:0:0:0:0:ffff:64cb:7be5
100.203.123.230 0:0:0:0:0:ffff:64cb:7be6
100.203.123.231 0:0:0:0:0:ffff:64cb:7be7
100.203.123.232 0:0:0:0:0:ffff:64cb:7be8
100.203.123.233 0:0:0:0:0:ffff:64cb:7be9
100.203.123.234 0:0:0:0:0:ffff:64cb:7bea
100.203.123.235 0:0:0:0:0:ffff:64cb:7beb
100.203.123.236 0:0:0:0:0:ffff:64cb:7bec
100.203.123.237 0:0:0:0:0:ffff:64cb:7bed
100.203.123.238 0:0:0:0:0:ffff:64cb:7bee
100.203.123.239 0:0:0:0:0:ffff:64cb:7bef
100.203.123.240 0:0:0:0:0:ffff:64cb:7bf0
100.203.123.241 0:0:0:0:0:ffff:64cb:7bf1
100.203.123.242 0:0:0:0:0:ffff:64cb:7bf2
100.203.123.243 0:0:0:0:0:ffff:64cb:7bf3
100.203.123.244 0:0:0:0:0:ffff:64cb:7bf4
100.203.123.245 0:0:0:0:0:ffff:64cb:7bf5
100.203.123.246 0:0:0:0:0:ffff:64cb:7bf6
100.203.123.247 0:0:0:0:0:ffff:64cb:7bf7
100.203.123.248 0:0:0:0:0:ffff:64cb:7bf8
100.203.123.249 0:0:0:0:0:ffff:64cb:7bf9
100.203.123.250 0:0:0:0:0:ffff:64cb:7bfa
100.203.123.251 0:0:0:0:0:ffff:64cb:7bfb
100.203.123.252 0:0:0:0:0:ffff:64cb:7bfc
100.203.123.253 0:0:0:0:0:ffff:64cb:7bfd
100.203.123.254 0:0:0:0:0:ffff:64cb:7bfe
100.203.123.255 0:0:0:0:0:ffff:64cb:7bff


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.