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
18.21.78.1 0:0:0:0:0:ffff:1215:4e01
18.21.78.2 0:0:0:0:0:ffff:1215:4e02
18.21.78.3 0:0:0:0:0:ffff:1215:4e03
18.21.78.4 0:0:0:0:0:ffff:1215:4e04
18.21.78.5 0:0:0:0:0:ffff:1215:4e05
18.21.78.6 0:0:0:0:0:ffff:1215:4e06
18.21.78.7 0:0:0:0:0:ffff:1215:4e07
18.21.78.8 0:0:0:0:0:ffff:1215:4e08
18.21.78.9 0:0:0:0:0:ffff:1215:4e09
18.21.78.10 0:0:0:0:0:ffff:1215:4e0a
18.21.78.11 0:0:0:0:0:ffff:1215:4e0b
18.21.78.12 0:0:0:0:0:ffff:1215:4e0c
18.21.78.13 0:0:0:0:0:ffff:1215:4e0d
18.21.78.14 0:0:0:0:0:ffff:1215:4e0e
18.21.78.15 0:0:0:0:0:ffff:1215:4e0f
18.21.78.16 0:0:0:0:0:ffff:1215:4e10
18.21.78.17 0:0:0:0:0:ffff:1215:4e11
18.21.78.18 0:0:0:0:0:ffff:1215:4e12
18.21.78.19 0:0:0:0:0:ffff:1215:4e13
18.21.78.20 0:0:0:0:0:ffff:1215:4e14
18.21.78.21 0:0:0:0:0:ffff:1215:4e15
18.21.78.22 0:0:0:0:0:ffff:1215:4e16
18.21.78.23 0:0:0:0:0:ffff:1215:4e17
18.21.78.24 0:0:0:0:0:ffff:1215:4e18
18.21.78.25 0:0:0:0:0:ffff:1215:4e19
18.21.78.26 0:0:0:0:0:ffff:1215:4e1a
18.21.78.27 0:0:0:0:0:ffff:1215:4e1b
18.21.78.28 0:0:0:0:0:ffff:1215:4e1c
18.21.78.29 0:0:0:0:0:ffff:1215:4e1d
18.21.78.30 0:0:0:0:0:ffff:1215:4e1e
18.21.78.31 0:0:0:0:0:ffff:1215:4e1f
18.21.78.32 0:0:0:0:0:ffff:1215:4e20
18.21.78.33 0:0:0:0:0:ffff:1215:4e21
18.21.78.34 0:0:0:0:0:ffff:1215:4e22
18.21.78.35 0:0:0:0:0:ffff:1215:4e23
18.21.78.36 0:0:0:0:0:ffff:1215:4e24
18.21.78.37 0:0:0:0:0:ffff:1215:4e25
18.21.78.38 0:0:0:0:0:ffff:1215:4e26
18.21.78.39 0:0:0:0:0:ffff:1215:4e27
18.21.78.40 0:0:0:0:0:ffff:1215:4e28
18.21.78.41 0:0:0:0:0:ffff:1215:4e29
18.21.78.42 0:0:0:0:0:ffff:1215:4e2a
18.21.78.43 0:0:0:0:0:ffff:1215:4e2b
18.21.78.44 0:0:0:0:0:ffff:1215:4e2c
18.21.78.45 0:0:0:0:0:ffff:1215:4e2d
18.21.78.46 0:0:0:0:0:ffff:1215:4e2e
18.21.78.47 0:0:0:0:0:ffff:1215:4e2f
18.21.78.48 0:0:0:0:0:ffff:1215:4e30
18.21.78.49 0:0:0:0:0:ffff:1215:4e31
18.21.78.50 0:0:0:0:0:ffff:1215:4e32
18.21.78.51 0:0:0:0:0:ffff:1215:4e33
18.21.78.52 0:0:0:0:0:ffff:1215:4e34
18.21.78.53 0:0:0:0:0:ffff:1215:4e35
18.21.78.54 0:0:0:0:0:ffff:1215:4e36
18.21.78.55 0:0:0:0:0:ffff:1215:4e37
18.21.78.56 0:0:0:0:0:ffff:1215:4e38
18.21.78.57 0:0:0:0:0:ffff:1215:4e39
18.21.78.58 0:0:0:0:0:ffff:1215:4e3a
18.21.78.59 0:0:0:0:0:ffff:1215:4e3b
18.21.78.60 0:0:0:0:0:ffff:1215:4e3c


18.21.78.61 0:0:0:0:0:ffff:1215:4e3d
18.21.78.62 0:0:0:0:0:ffff:1215:4e3e
18.21.78.63 0:0:0:0:0:ffff:1215:4e3f
18.21.78.64 0:0:0:0:0:ffff:1215:4e40
18.21.78.65 0:0:0:0:0:ffff:1215:4e41
18.21.78.66 0:0:0:0:0:ffff:1215:4e42
18.21.78.67 0:0:0:0:0:ffff:1215:4e43
18.21.78.68 0:0:0:0:0:ffff:1215:4e44
18.21.78.69 0:0:0:0:0:ffff:1215:4e45
18.21.78.70 0:0:0:0:0:ffff:1215:4e46
18.21.78.71 0:0:0:0:0:ffff:1215:4e47
18.21.78.72 0:0:0:0:0:ffff:1215:4e48
18.21.78.73 0:0:0:0:0:ffff:1215:4e49
18.21.78.74 0:0:0:0:0:ffff:1215:4e4a
18.21.78.75 0:0:0:0:0:ffff:1215:4e4b
18.21.78.76 0:0:0:0:0:ffff:1215:4e4c
18.21.78.77 0:0:0:0:0:ffff:1215:4e4d
18.21.78.78 0:0:0:0:0:ffff:1215:4e4e
18.21.78.79 0:0:0:0:0:ffff:1215:4e4f
18.21.78.80 0:0:0:0:0:ffff:1215:4e50
18.21.78.81 0:0:0:0:0:ffff:1215:4e51
18.21.78.82 0:0:0:0:0:ffff:1215:4e52
18.21.78.83 0:0:0:0:0:ffff:1215:4e53
18.21.78.84 0:0:0:0:0:ffff:1215:4e54
18.21.78.85 0:0:0:0:0:ffff:1215:4e55
18.21.78.86 0:0:0:0:0:ffff:1215:4e56
18.21.78.87 0:0:0:0:0:ffff:1215:4e57
18.21.78.88 0:0:0:0:0:ffff:1215:4e58
18.21.78.89 0:0:0:0:0:ffff:1215:4e59
18.21.78.90 0:0:0:0:0:ffff:1215:4e5a
18.21.78.91 0:0:0:0:0:ffff:1215:4e5b
18.21.78.92 0:0:0:0:0:ffff:1215:4e5c
18.21.78.93 0:0:0:0:0:ffff:1215:4e5d
18.21.78.94 0:0:0:0:0:ffff:1215:4e5e
18.21.78.95 0:0:0:0:0:ffff:1215:4e5f
18.21.78.96 0:0:0:0:0:ffff:1215:4e60
18.21.78.97 0:0:0:0:0:ffff:1215:4e61
18.21.78.98 0:0:0:0:0:ffff:1215:4e62
18.21.78.99 0:0:0:0:0:ffff:1215:4e63
18.21.78.100 0:0:0:0:0:ffff:1215:4e64
18.21.78.101 0:0:0:0:0:ffff:1215:4e65
18.21.78.102 0:0:0:0:0:ffff:1215:4e66
18.21.78.103 0:0:0:0:0:ffff:1215:4e67
18.21.78.104 0:0:0:0:0:ffff:1215:4e68
18.21.78.105 0:0:0:0:0:ffff:1215:4e69
18.21.78.106 0:0:0:0:0:ffff:1215:4e6a
18.21.78.107 0:0:0:0:0:ffff:1215:4e6b
18.21.78.108 0:0:0:0:0:ffff:1215:4e6c
18.21.78.109 0:0:0:0:0:ffff:1215:4e6d
18.21.78.110 0:0:0:0:0:ffff:1215:4e6e
18.21.78.111 0:0:0:0:0:ffff:1215:4e6f
18.21.78.112 0:0:0:0:0:ffff:1215:4e70
18.21.78.113 0:0:0:0:0:ffff:1215:4e71
18.21.78.114 0:0:0:0:0:ffff:1215:4e72
18.21.78.115 0:0:0:0:0:ffff:1215:4e73
18.21.78.116 0:0:0:0:0:ffff:1215:4e74
18.21.78.117 0:0:0:0:0:ffff:1215:4e75
18.21.78.118 0:0:0:0:0:ffff:1215:4e76
18.21.78.119 0:0:0:0:0:ffff:1215:4e77
18.21.78.120 0:0:0:0:0:ffff:1215:4e78


18.21.78.121 0:0:0:0:0:ffff:1215:4e79
18.21.78.122 0:0:0:0:0:ffff:1215:4e7a
18.21.78.123 0:0:0:0:0:ffff:1215:4e7b
18.21.78.124 0:0:0:0:0:ffff:1215:4e7c
18.21.78.125 0:0:0:0:0:ffff:1215:4e7d
18.21.78.126 0:0:0:0:0:ffff:1215:4e7e
18.21.78.127 0:0:0:0:0:ffff:1215:4e7f
18.21.78.128 0:0:0:0:0:ffff:1215:4e80
18.21.78.129 0:0:0:0:0:ffff:1215:4e81
18.21.78.130 0:0:0:0:0:ffff:1215:4e82
18.21.78.131 0:0:0:0:0:ffff:1215:4e83
18.21.78.132 0:0:0:0:0:ffff:1215:4e84
18.21.78.133 0:0:0:0:0:ffff:1215:4e85
18.21.78.134 0:0:0:0:0:ffff:1215:4e86
18.21.78.135 0:0:0:0:0:ffff:1215:4e87
18.21.78.136 0:0:0:0:0:ffff:1215:4e88
18.21.78.137 0:0:0:0:0:ffff:1215:4e89
18.21.78.138 0:0:0:0:0:ffff:1215:4e8a
18.21.78.139 0:0:0:0:0:ffff:1215:4e8b
18.21.78.140 0:0:0:0:0:ffff:1215:4e8c
18.21.78.141 0:0:0:0:0:ffff:1215:4e8d
18.21.78.142 0:0:0:0:0:ffff:1215:4e8e
18.21.78.143 0:0:0:0:0:ffff:1215:4e8f
18.21.78.144 0:0:0:0:0:ffff:1215:4e90
18.21.78.145 0:0:0:0:0:ffff:1215:4e91
18.21.78.146 0:0:0:0:0:ffff:1215:4e92
18.21.78.147 0:0:0:0:0:ffff:1215:4e93
18.21.78.148 0:0:0:0:0:ffff:1215:4e94
18.21.78.149 0:0:0:0:0:ffff:1215:4e95
18.21.78.150 0:0:0:0:0:ffff:1215:4e96
18.21.78.151 0:0:0:0:0:ffff:1215:4e97
18.21.78.152 0:0:0:0:0:ffff:1215:4e98
18.21.78.153 0:0:0:0:0:ffff:1215:4e99
18.21.78.154 0:0:0:0:0:ffff:1215:4e9a
18.21.78.155 0:0:0:0:0:ffff:1215:4e9b
18.21.78.156 0:0:0:0:0:ffff:1215:4e9c
18.21.78.157 0:0:0:0:0:ffff:1215:4e9d
18.21.78.158 0:0:0:0:0:ffff:1215:4e9e
18.21.78.159 0:0:0:0:0:ffff:1215:4e9f
18.21.78.160 0:0:0:0:0:ffff:1215:4ea0
18.21.78.161 0:0:0:0:0:ffff:1215:4ea1
18.21.78.162 0:0:0:0:0:ffff:1215:4ea2
18.21.78.163 0:0:0:0:0:ffff:1215:4ea3
18.21.78.164 0:0:0:0:0:ffff:1215:4ea4
18.21.78.165 0:0:0:0:0:ffff:1215:4ea5
18.21.78.166 0:0:0:0:0:ffff:1215:4ea6
18.21.78.167 0:0:0:0:0:ffff:1215:4ea7
18.21.78.168 0:0:0:0:0:ffff:1215:4ea8
18.21.78.169 0:0:0:0:0:ffff:1215:4ea9
18.21.78.170 0:0:0:0:0:ffff:1215:4eaa
18.21.78.171 0:0:0:0:0:ffff:1215:4eab
18.21.78.172 0:0:0:0:0:ffff:1215:4eac
18.21.78.173 0:0:0:0:0:ffff:1215:4ead
18.21.78.174 0:0:0:0:0:ffff:1215:4eae
18.21.78.175 0:0:0:0:0:ffff:1215:4eaf
18.21.78.176 0:0:0:0:0:ffff:1215:4eb0
18.21.78.177 0:0:0:0:0:ffff:1215:4eb1
18.21.78.178 0:0:0:0:0:ffff:1215:4eb2
18.21.78.179 0:0:0:0:0:ffff:1215:4eb3
18.21.78.180 0:0:0:0:0:ffff:1215:4eb4


18.21.78.181 0:0:0:0:0:ffff:1215:4eb5
18.21.78.182 0:0:0:0:0:ffff:1215:4eb6
18.21.78.183 0:0:0:0:0:ffff:1215:4eb7
18.21.78.184 0:0:0:0:0:ffff:1215:4eb8
18.21.78.185 0:0:0:0:0:ffff:1215:4eb9
18.21.78.186 0:0:0:0:0:ffff:1215:4eba
18.21.78.187 0:0:0:0:0:ffff:1215:4ebb
18.21.78.188 0:0:0:0:0:ffff:1215:4ebc
18.21.78.189 0:0:0:0:0:ffff:1215:4ebd
18.21.78.190 0:0:0:0:0:ffff:1215:4ebe
18.21.78.191 0:0:0:0:0:ffff:1215:4ebf
18.21.78.192 0:0:0:0:0:ffff:1215:4ec0
18.21.78.193 0:0:0:0:0:ffff:1215:4ec1
18.21.78.194 0:0:0:0:0:ffff:1215:4ec2
18.21.78.195 0:0:0:0:0:ffff:1215:4ec3
18.21.78.196 0:0:0:0:0:ffff:1215:4ec4
18.21.78.197 0:0:0:0:0:ffff:1215:4ec5
18.21.78.198 0:0:0:0:0:ffff:1215:4ec6
18.21.78.199 0:0:0:0:0:ffff:1215:4ec7
18.21.78.200 0:0:0:0:0:ffff:1215:4ec8
18.21.78.201 0:0:0:0:0:ffff:1215:4ec9
18.21.78.202 0:0:0:0:0:ffff:1215:4eca
18.21.78.203 0:0:0:0:0:ffff:1215:4ecb
18.21.78.204 0:0:0:0:0:ffff:1215:4ecc
18.21.78.205 0:0:0:0:0:ffff:1215:4ecd
18.21.78.206 0:0:0:0:0:ffff:1215:4ece
18.21.78.207 0:0:0:0:0:ffff:1215:4ecf
18.21.78.208 0:0:0:0:0:ffff:1215:4ed0
18.21.78.209 0:0:0:0:0:ffff:1215:4ed1
18.21.78.210 0:0:0:0:0:ffff:1215:4ed2
18.21.78.211 0:0:0:0:0:ffff:1215:4ed3
18.21.78.212 0:0:0:0:0:ffff:1215:4ed4
18.21.78.213 0:0:0:0:0:ffff:1215:4ed5
18.21.78.214 0:0:0:0:0:ffff:1215:4ed6
18.21.78.215 0:0:0:0:0:ffff:1215:4ed7
18.21.78.216 0:0:0:0:0:ffff:1215:4ed8
18.21.78.217 0:0:0:0:0:ffff:1215:4ed9
18.21.78.218 0:0:0:0:0:ffff:1215:4eda
18.21.78.219 0:0:0:0:0:ffff:1215:4edb
18.21.78.220 0:0:0:0:0:ffff:1215:4edc
18.21.78.221 0:0:0:0:0:ffff:1215:4edd
18.21.78.222 0:0:0:0:0:ffff:1215:4ede
18.21.78.223 0:0:0:0:0:ffff:1215:4edf
18.21.78.224 0:0:0:0:0:ffff:1215:4ee0
18.21.78.225 0:0:0:0:0:ffff:1215:4ee1
18.21.78.226 0:0:0:0:0:ffff:1215:4ee2
18.21.78.227 0:0:0:0:0:ffff:1215:4ee3
18.21.78.228 0:0:0:0:0:ffff:1215:4ee4
18.21.78.229 0:0:0:0:0:ffff:1215:4ee5
18.21.78.230 0:0:0:0:0:ffff:1215:4ee6
18.21.78.231 0:0:0:0:0:ffff:1215:4ee7
18.21.78.232 0:0:0:0:0:ffff:1215:4ee8
18.21.78.233 0:0:0:0:0:ffff:1215:4ee9
18.21.78.234 0:0:0:0:0:ffff:1215:4eea
18.21.78.235 0:0:0:0:0:ffff:1215:4eeb
18.21.78.236 0:0:0:0:0:ffff:1215:4eec
18.21.78.237 0:0:0:0:0:ffff:1215:4eed
18.21.78.238 0:0:0:0:0:ffff:1215:4eee
18.21.78.239 0:0:0:0:0:ffff:1215:4eef
18.21.78.240 0:0:0:0:0:ffff:1215:4ef0
18.21.78.241 0:0:0:0:0:ffff:1215:4ef1
18.21.78.242 0:0:0:0:0:ffff:1215:4ef2
18.21.78.243 0:0:0:0:0:ffff:1215:4ef3
18.21.78.244 0:0:0:0:0:ffff:1215:4ef4
18.21.78.245 0:0:0:0:0:ffff:1215:4ef5
18.21.78.246 0:0:0:0:0:ffff:1215:4ef6
18.21.78.247 0:0:0:0:0:ffff:1215:4ef7
18.21.78.248 0:0:0:0:0:ffff:1215:4ef8
18.21.78.249 0:0:0:0:0:ffff:1215:4ef9
18.21.78.250 0:0:0:0:0:ffff:1215:4efa
18.21.78.251 0:0:0:0:0:ffff:1215:4efb
18.21.78.252 0:0:0:0:0:ffff:1215:4efc
18.21.78.253 0:0:0:0:0:ffff:1215:4efd
18.21.78.254 0:0:0:0:0:ffff:1215:4efe
18.21.78.255 0:0:0:0:0:ffff:1215:4eff


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.