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
100.203.42.1 0:0:0:0:0:ffff:64cb:2a01
100.203.42.2 0:0:0:0:0:ffff:64cb:2a02
100.203.42.3 0:0:0:0:0:ffff:64cb:2a03
100.203.42.4 0:0:0:0:0:ffff:64cb:2a04
100.203.42.5 0:0:0:0:0:ffff:64cb:2a05
100.203.42.6 0:0:0:0:0:ffff:64cb:2a06
100.203.42.7 0:0:0:0:0:ffff:64cb:2a07
100.203.42.8 0:0:0:0:0:ffff:64cb:2a08
100.203.42.9 0:0:0:0:0:ffff:64cb:2a09
100.203.42.10 0:0:0:0:0:ffff:64cb:2a0a
100.203.42.11 0:0:0:0:0:ffff:64cb:2a0b
100.203.42.12 0:0:0:0:0:ffff:64cb:2a0c
100.203.42.13 0:0:0:0:0:ffff:64cb:2a0d
100.203.42.14 0:0:0:0:0:ffff:64cb:2a0e
100.203.42.15 0:0:0:0:0:ffff:64cb:2a0f
100.203.42.16 0:0:0:0:0:ffff:64cb:2a10
100.203.42.17 0:0:0:0:0:ffff:64cb:2a11
100.203.42.18 0:0:0:0:0:ffff:64cb:2a12
100.203.42.19 0:0:0:0:0:ffff:64cb:2a13
100.203.42.20 0:0:0:0:0:ffff:64cb:2a14
100.203.42.21 0:0:0:0:0:ffff:64cb:2a15
100.203.42.22 0:0:0:0:0:ffff:64cb:2a16
100.203.42.23 0:0:0:0:0:ffff:64cb:2a17
100.203.42.24 0:0:0:0:0:ffff:64cb:2a18
100.203.42.25 0:0:0:0:0:ffff:64cb:2a19
100.203.42.26 0:0:0:0:0:ffff:64cb:2a1a
100.203.42.27 0:0:0:0:0:ffff:64cb:2a1b
100.203.42.28 0:0:0:0:0:ffff:64cb:2a1c
100.203.42.29 0:0:0:0:0:ffff:64cb:2a1d
100.203.42.30 0:0:0:0:0:ffff:64cb:2a1e
100.203.42.31 0:0:0:0:0:ffff:64cb:2a1f
100.203.42.32 0:0:0:0:0:ffff:64cb:2a20
100.203.42.33 0:0:0:0:0:ffff:64cb:2a21
100.203.42.34 0:0:0:0:0:ffff:64cb:2a22
100.203.42.35 0:0:0:0:0:ffff:64cb:2a23
100.203.42.36 0:0:0:0:0:ffff:64cb:2a24
100.203.42.37 0:0:0:0:0:ffff:64cb:2a25
100.203.42.38 0:0:0:0:0:ffff:64cb:2a26
100.203.42.39 0:0:0:0:0:ffff:64cb:2a27
100.203.42.40 0:0:0:0:0:ffff:64cb:2a28
100.203.42.41 0:0:0:0:0:ffff:64cb:2a29
100.203.42.42 0:0:0:0:0:ffff:64cb:2a2a
100.203.42.43 0:0:0:0:0:ffff:64cb:2a2b
100.203.42.44 0:0:0:0:0:ffff:64cb:2a2c
100.203.42.45 0:0:0:0:0:ffff:64cb:2a2d
100.203.42.46 0:0:0:0:0:ffff:64cb:2a2e
100.203.42.47 0:0:0:0:0:ffff:64cb:2a2f
100.203.42.48 0:0:0:0:0:ffff:64cb:2a30
100.203.42.49 0:0:0:0:0:ffff:64cb:2a31
100.203.42.50 0:0:0:0:0:ffff:64cb:2a32
100.203.42.51 0:0:0:0:0:ffff:64cb:2a33
100.203.42.52 0:0:0:0:0:ffff:64cb:2a34
100.203.42.53 0:0:0:0:0:ffff:64cb:2a35
100.203.42.54 0:0:0:0:0:ffff:64cb:2a36
100.203.42.55 0:0:0:0:0:ffff:64cb:2a37
100.203.42.56 0:0:0:0:0:ffff:64cb:2a38
100.203.42.57 0:0:0:0:0:ffff:64cb:2a39
100.203.42.58 0:0:0:0:0:ffff:64cb:2a3a
100.203.42.59 0:0:0:0:0:ffff:64cb:2a3b
100.203.42.60 0:0:0:0:0:ffff:64cb:2a3c


100.203.42.61 0:0:0:0:0:ffff:64cb:2a3d
100.203.42.62 0:0:0:0:0:ffff:64cb:2a3e
100.203.42.63 0:0:0:0:0:ffff:64cb:2a3f
100.203.42.64 0:0:0:0:0:ffff:64cb:2a40
100.203.42.65 0:0:0:0:0:ffff:64cb:2a41
100.203.42.66 0:0:0:0:0:ffff:64cb:2a42
100.203.42.67 0:0:0:0:0:ffff:64cb:2a43
100.203.42.68 0:0:0:0:0:ffff:64cb:2a44
100.203.42.69 0:0:0:0:0:ffff:64cb:2a45
100.203.42.70 0:0:0:0:0:ffff:64cb:2a46
100.203.42.71 0:0:0:0:0:ffff:64cb:2a47
100.203.42.72 0:0:0:0:0:ffff:64cb:2a48
100.203.42.73 0:0:0:0:0:ffff:64cb:2a49
100.203.42.74 0:0:0:0:0:ffff:64cb:2a4a
100.203.42.75 0:0:0:0:0:ffff:64cb:2a4b
100.203.42.76 0:0:0:0:0:ffff:64cb:2a4c
100.203.42.77 0:0:0:0:0:ffff:64cb:2a4d
100.203.42.78 0:0:0:0:0:ffff:64cb:2a4e
100.203.42.79 0:0:0:0:0:ffff:64cb:2a4f
100.203.42.80 0:0:0:0:0:ffff:64cb:2a50
100.203.42.81 0:0:0:0:0:ffff:64cb:2a51
100.203.42.82 0:0:0:0:0:ffff:64cb:2a52
100.203.42.83 0:0:0:0:0:ffff:64cb:2a53
100.203.42.84 0:0:0:0:0:ffff:64cb:2a54
100.203.42.85 0:0:0:0:0:ffff:64cb:2a55
100.203.42.86 0:0:0:0:0:ffff:64cb:2a56
100.203.42.87 0:0:0:0:0:ffff:64cb:2a57
100.203.42.88 0:0:0:0:0:ffff:64cb:2a58
100.203.42.89 0:0:0:0:0:ffff:64cb:2a59
100.203.42.90 0:0:0:0:0:ffff:64cb:2a5a
100.203.42.91 0:0:0:0:0:ffff:64cb:2a5b
100.203.42.92 0:0:0:0:0:ffff:64cb:2a5c
100.203.42.93 0:0:0:0:0:ffff:64cb:2a5d
100.203.42.94 0:0:0:0:0:ffff:64cb:2a5e
100.203.42.95 0:0:0:0:0:ffff:64cb:2a5f
100.203.42.96 0:0:0:0:0:ffff:64cb:2a60
100.203.42.97 0:0:0:0:0:ffff:64cb:2a61
100.203.42.98 0:0:0:0:0:ffff:64cb:2a62
100.203.42.99 0:0:0:0:0:ffff:64cb:2a63
100.203.42.100 0:0:0:0:0:ffff:64cb:2a64
100.203.42.101 0:0:0:0:0:ffff:64cb:2a65
100.203.42.102 0:0:0:0:0:ffff:64cb:2a66
100.203.42.103 0:0:0:0:0:ffff:64cb:2a67
100.203.42.104 0:0:0:0:0:ffff:64cb:2a68
100.203.42.105 0:0:0:0:0:ffff:64cb:2a69
100.203.42.106 0:0:0:0:0:ffff:64cb:2a6a
100.203.42.107 0:0:0:0:0:ffff:64cb:2a6b
100.203.42.108 0:0:0:0:0:ffff:64cb:2a6c
100.203.42.109 0:0:0:0:0:ffff:64cb:2a6d
100.203.42.110 0:0:0:0:0:ffff:64cb:2a6e
100.203.42.111 0:0:0:0:0:ffff:64cb:2a6f
100.203.42.112 0:0:0:0:0:ffff:64cb:2a70
100.203.42.113 0:0:0:0:0:ffff:64cb:2a71
100.203.42.114 0:0:0:0:0:ffff:64cb:2a72
100.203.42.115 0:0:0:0:0:ffff:64cb:2a73
100.203.42.116 0:0:0:0:0:ffff:64cb:2a74
100.203.42.117 0:0:0:0:0:ffff:64cb:2a75
100.203.42.118 0:0:0:0:0:ffff:64cb:2a76
100.203.42.119 0:0:0:0:0:ffff:64cb:2a77
100.203.42.120 0:0:0:0:0:ffff:64cb:2a78


100.203.42.121 0:0:0:0:0:ffff:64cb:2a79
100.203.42.122 0:0:0:0:0:ffff:64cb:2a7a
100.203.42.123 0:0:0:0:0:ffff:64cb:2a7b
100.203.42.124 0:0:0:0:0:ffff:64cb:2a7c
100.203.42.125 0:0:0:0:0:ffff:64cb:2a7d
100.203.42.126 0:0:0:0:0:ffff:64cb:2a7e
100.203.42.127 0:0:0:0:0:ffff:64cb:2a7f
100.203.42.128 0:0:0:0:0:ffff:64cb:2a80
100.203.42.129 0:0:0:0:0:ffff:64cb:2a81
100.203.42.130 0:0:0:0:0:ffff:64cb:2a82
100.203.42.131 0:0:0:0:0:ffff:64cb:2a83
100.203.42.132 0:0:0:0:0:ffff:64cb:2a84
100.203.42.133 0:0:0:0:0:ffff:64cb:2a85
100.203.42.134 0:0:0:0:0:ffff:64cb:2a86
100.203.42.135 0:0:0:0:0:ffff:64cb:2a87
100.203.42.136 0:0:0:0:0:ffff:64cb:2a88
100.203.42.137 0:0:0:0:0:ffff:64cb:2a89
100.203.42.138 0:0:0:0:0:ffff:64cb:2a8a
100.203.42.139 0:0:0:0:0:ffff:64cb:2a8b
100.203.42.140 0:0:0:0:0:ffff:64cb:2a8c
100.203.42.141 0:0:0:0:0:ffff:64cb:2a8d
100.203.42.142 0:0:0:0:0:ffff:64cb:2a8e
100.203.42.143 0:0:0:0:0:ffff:64cb:2a8f
100.203.42.144 0:0:0:0:0:ffff:64cb:2a90
100.203.42.145 0:0:0:0:0:ffff:64cb:2a91
100.203.42.146 0:0:0:0:0:ffff:64cb:2a92
100.203.42.147 0:0:0:0:0:ffff:64cb:2a93
100.203.42.148 0:0:0:0:0:ffff:64cb:2a94
100.203.42.149 0:0:0:0:0:ffff:64cb:2a95
100.203.42.150 0:0:0:0:0:ffff:64cb:2a96
100.203.42.151 0:0:0:0:0:ffff:64cb:2a97
100.203.42.152 0:0:0:0:0:ffff:64cb:2a98
100.203.42.153 0:0:0:0:0:ffff:64cb:2a99
100.203.42.154 0:0:0:0:0:ffff:64cb:2a9a
100.203.42.155 0:0:0:0:0:ffff:64cb:2a9b
100.203.42.156 0:0:0:0:0:ffff:64cb:2a9c
100.203.42.157 0:0:0:0:0:ffff:64cb:2a9d
100.203.42.158 0:0:0:0:0:ffff:64cb:2a9e
100.203.42.159 0:0:0:0:0:ffff:64cb:2a9f
100.203.42.160 0:0:0:0:0:ffff:64cb:2aa0
100.203.42.161 0:0:0:0:0:ffff:64cb:2aa1
100.203.42.162 0:0:0:0:0:ffff:64cb:2aa2
100.203.42.163 0:0:0:0:0:ffff:64cb:2aa3
100.203.42.164 0:0:0:0:0:ffff:64cb:2aa4
100.203.42.165 0:0:0:0:0:ffff:64cb:2aa5
100.203.42.166 0:0:0:0:0:ffff:64cb:2aa6
100.203.42.167 0:0:0:0:0:ffff:64cb:2aa7
100.203.42.168 0:0:0:0:0:ffff:64cb:2aa8
100.203.42.169 0:0:0:0:0:ffff:64cb:2aa9
100.203.42.170 0:0:0:0:0:ffff:64cb:2aaa
100.203.42.171 0:0:0:0:0:ffff:64cb:2aab
100.203.42.172 0:0:0:0:0:ffff:64cb:2aac
100.203.42.173 0:0:0:0:0:ffff:64cb:2aad
100.203.42.174 0:0:0:0:0:ffff:64cb:2aae
100.203.42.175 0:0:0:0:0:ffff:64cb:2aaf
100.203.42.176 0:0:0:0:0:ffff:64cb:2ab0
100.203.42.177 0:0:0:0:0:ffff:64cb:2ab1
100.203.42.178 0:0:0:0:0:ffff:64cb:2ab2
100.203.42.179 0:0:0:0:0:ffff:64cb:2ab3
100.203.42.180 0:0:0:0:0:ffff:64cb:2ab4


100.203.42.181 0:0:0:0:0:ffff:64cb:2ab5
100.203.42.182 0:0:0:0:0:ffff:64cb:2ab6
100.203.42.183 0:0:0:0:0:ffff:64cb:2ab7
100.203.42.184 0:0:0:0:0:ffff:64cb:2ab8
100.203.42.185 0:0:0:0:0:ffff:64cb:2ab9
100.203.42.186 0:0:0:0:0:ffff:64cb:2aba
100.203.42.187 0:0:0:0:0:ffff:64cb:2abb
100.203.42.188 0:0:0:0:0:ffff:64cb:2abc
100.203.42.189 0:0:0:0:0:ffff:64cb:2abd
100.203.42.190 0:0:0:0:0:ffff:64cb:2abe
100.203.42.191 0:0:0:0:0:ffff:64cb:2abf
100.203.42.192 0:0:0:0:0:ffff:64cb:2ac0
100.203.42.193 0:0:0:0:0:ffff:64cb:2ac1
100.203.42.194 0:0:0:0:0:ffff:64cb:2ac2
100.203.42.195 0:0:0:0:0:ffff:64cb:2ac3
100.203.42.196 0:0:0:0:0:ffff:64cb:2ac4
100.203.42.197 0:0:0:0:0:ffff:64cb:2ac5
100.203.42.198 0:0:0:0:0:ffff:64cb:2ac6
100.203.42.199 0:0:0:0:0:ffff:64cb:2ac7
100.203.42.200 0:0:0:0:0:ffff:64cb:2ac8
100.203.42.201 0:0:0:0:0:ffff:64cb:2ac9
100.203.42.202 0:0:0:0:0:ffff:64cb:2aca
100.203.42.203 0:0:0:0:0:ffff:64cb:2acb
100.203.42.204 0:0:0:0:0:ffff:64cb:2acc
100.203.42.205 0:0:0:0:0:ffff:64cb:2acd
100.203.42.206 0:0:0:0:0:ffff:64cb:2ace
100.203.42.207 0:0:0:0:0:ffff:64cb:2acf
100.203.42.208 0:0:0:0:0:ffff:64cb:2ad0
100.203.42.209 0:0:0:0:0:ffff:64cb:2ad1
100.203.42.210 0:0:0:0:0:ffff:64cb:2ad2
100.203.42.211 0:0:0:0:0:ffff:64cb:2ad3
100.203.42.212 0:0:0:0:0:ffff:64cb:2ad4
100.203.42.213 0:0:0:0:0:ffff:64cb:2ad5
100.203.42.214 0:0:0:0:0:ffff:64cb:2ad6
100.203.42.215 0:0:0:0:0:ffff:64cb:2ad7
100.203.42.216 0:0:0:0:0:ffff:64cb:2ad8
100.203.42.217 0:0:0:0:0:ffff:64cb:2ad9
100.203.42.218 0:0:0:0:0:ffff:64cb:2ada
100.203.42.219 0:0:0:0:0:ffff:64cb:2adb
100.203.42.220 0:0:0:0:0:ffff:64cb:2adc
100.203.42.221 0:0:0:0:0:ffff:64cb:2add
100.203.42.222 0:0:0:0:0:ffff:64cb:2ade
100.203.42.223 0:0:0:0:0:ffff:64cb:2adf
100.203.42.224 0:0:0:0:0:ffff:64cb:2ae0
100.203.42.225 0:0:0:0:0:ffff:64cb:2ae1
100.203.42.226 0:0:0:0:0:ffff:64cb:2ae2
100.203.42.227 0:0:0:0:0:ffff:64cb:2ae3
100.203.42.228 0:0:0:0:0:ffff:64cb:2ae4
100.203.42.229 0:0:0:0:0:ffff:64cb:2ae5
100.203.42.230 0:0:0:0:0:ffff:64cb:2ae6
100.203.42.231 0:0:0:0:0:ffff:64cb:2ae7
100.203.42.232 0:0:0:0:0:ffff:64cb:2ae8
100.203.42.233 0:0:0:0:0:ffff:64cb:2ae9
100.203.42.234 0:0:0:0:0:ffff:64cb:2aea
100.203.42.235 0:0:0:0:0:ffff:64cb:2aeb
100.203.42.236 0:0:0:0:0:ffff:64cb:2aec
100.203.42.237 0:0:0:0:0:ffff:64cb:2aed
100.203.42.238 0:0:0:0:0:ffff:64cb:2aee
100.203.42.239 0:0:0:0:0:ffff:64cb:2aef
100.203.42.240 0:0:0:0:0:ffff:64cb:2af0
100.203.42.241 0:0:0:0:0:ffff:64cb:2af1
100.203.42.242 0:0:0:0:0:ffff:64cb:2af2
100.203.42.243 0:0:0:0:0:ffff:64cb:2af3
100.203.42.244 0:0:0:0:0:ffff:64cb:2af4
100.203.42.245 0:0:0:0:0:ffff:64cb:2af5
100.203.42.246 0:0:0:0:0:ffff:64cb:2af6
100.203.42.247 0:0:0:0:0:ffff:64cb:2af7
100.203.42.248 0:0:0:0:0:ffff:64cb:2af8
100.203.42.249 0:0:0:0:0:ffff:64cb:2af9
100.203.42.250 0:0:0:0:0:ffff:64cb:2afa
100.203.42.251 0:0:0:0:0:ffff:64cb:2afb
100.203.42.252 0:0:0:0:0:ffff:64cb:2afc
100.203.42.253 0:0:0:0:0:ffff:64cb:2afd
100.203.42.254 0:0:0:0:0:ffff:64cb:2afe
100.203.42.255 0:0:0:0:0:ffff:64cb:2aff


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.