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
21.91.139.1 0:0:0:0:0:ffff:155b:8b01
21.91.139.2 0:0:0:0:0:ffff:155b:8b02
21.91.139.3 0:0:0:0:0:ffff:155b:8b03
21.91.139.4 0:0:0:0:0:ffff:155b:8b04
21.91.139.5 0:0:0:0:0:ffff:155b:8b05
21.91.139.6 0:0:0:0:0:ffff:155b:8b06
21.91.139.7 0:0:0:0:0:ffff:155b:8b07
21.91.139.8 0:0:0:0:0:ffff:155b:8b08
21.91.139.9 0:0:0:0:0:ffff:155b:8b09
21.91.139.10 0:0:0:0:0:ffff:155b:8b0a
21.91.139.11 0:0:0:0:0:ffff:155b:8b0b
21.91.139.12 0:0:0:0:0:ffff:155b:8b0c
21.91.139.13 0:0:0:0:0:ffff:155b:8b0d
21.91.139.14 0:0:0:0:0:ffff:155b:8b0e
21.91.139.15 0:0:0:0:0:ffff:155b:8b0f
21.91.139.16 0:0:0:0:0:ffff:155b:8b10
21.91.139.17 0:0:0:0:0:ffff:155b:8b11
21.91.139.18 0:0:0:0:0:ffff:155b:8b12
21.91.139.19 0:0:0:0:0:ffff:155b:8b13
21.91.139.20 0:0:0:0:0:ffff:155b:8b14
21.91.139.21 0:0:0:0:0:ffff:155b:8b15
21.91.139.22 0:0:0:0:0:ffff:155b:8b16
21.91.139.23 0:0:0:0:0:ffff:155b:8b17
21.91.139.24 0:0:0:0:0:ffff:155b:8b18
21.91.139.25 0:0:0:0:0:ffff:155b:8b19
21.91.139.26 0:0:0:0:0:ffff:155b:8b1a
21.91.139.27 0:0:0:0:0:ffff:155b:8b1b
21.91.139.28 0:0:0:0:0:ffff:155b:8b1c
21.91.139.29 0:0:0:0:0:ffff:155b:8b1d
21.91.139.30 0:0:0:0:0:ffff:155b:8b1e
21.91.139.31 0:0:0:0:0:ffff:155b:8b1f
21.91.139.32 0:0:0:0:0:ffff:155b:8b20
21.91.139.33 0:0:0:0:0:ffff:155b:8b21
21.91.139.34 0:0:0:0:0:ffff:155b:8b22
21.91.139.35 0:0:0:0:0:ffff:155b:8b23
21.91.139.36 0:0:0:0:0:ffff:155b:8b24
21.91.139.37 0:0:0:0:0:ffff:155b:8b25
21.91.139.38 0:0:0:0:0:ffff:155b:8b26
21.91.139.39 0:0:0:0:0:ffff:155b:8b27
21.91.139.40 0:0:0:0:0:ffff:155b:8b28
21.91.139.41 0:0:0:0:0:ffff:155b:8b29
21.91.139.42 0:0:0:0:0:ffff:155b:8b2a
21.91.139.43 0:0:0:0:0:ffff:155b:8b2b
21.91.139.44 0:0:0:0:0:ffff:155b:8b2c
21.91.139.45 0:0:0:0:0:ffff:155b:8b2d
21.91.139.46 0:0:0:0:0:ffff:155b:8b2e
21.91.139.47 0:0:0:0:0:ffff:155b:8b2f
21.91.139.48 0:0:0:0:0:ffff:155b:8b30
21.91.139.49 0:0:0:0:0:ffff:155b:8b31
21.91.139.50 0:0:0:0:0:ffff:155b:8b32
21.91.139.51 0:0:0:0:0:ffff:155b:8b33
21.91.139.52 0:0:0:0:0:ffff:155b:8b34
21.91.139.53 0:0:0:0:0:ffff:155b:8b35
21.91.139.54 0:0:0:0:0:ffff:155b:8b36
21.91.139.55 0:0:0:0:0:ffff:155b:8b37
21.91.139.56 0:0:0:0:0:ffff:155b:8b38
21.91.139.57 0:0:0:0:0:ffff:155b:8b39
21.91.139.58 0:0:0:0:0:ffff:155b:8b3a
21.91.139.59 0:0:0:0:0:ffff:155b:8b3b
21.91.139.60 0:0:0:0:0:ffff:155b:8b3c


21.91.139.61 0:0:0:0:0:ffff:155b:8b3d
21.91.139.62 0:0:0:0:0:ffff:155b:8b3e
21.91.139.63 0:0:0:0:0:ffff:155b:8b3f
21.91.139.64 0:0:0:0:0:ffff:155b:8b40
21.91.139.65 0:0:0:0:0:ffff:155b:8b41
21.91.139.66 0:0:0:0:0:ffff:155b:8b42
21.91.139.67 0:0:0:0:0:ffff:155b:8b43
21.91.139.68 0:0:0:0:0:ffff:155b:8b44
21.91.139.69 0:0:0:0:0:ffff:155b:8b45
21.91.139.70 0:0:0:0:0:ffff:155b:8b46
21.91.139.71 0:0:0:0:0:ffff:155b:8b47
21.91.139.72 0:0:0:0:0:ffff:155b:8b48
21.91.139.73 0:0:0:0:0:ffff:155b:8b49
21.91.139.74 0:0:0:0:0:ffff:155b:8b4a
21.91.139.75 0:0:0:0:0:ffff:155b:8b4b
21.91.139.76 0:0:0:0:0:ffff:155b:8b4c
21.91.139.77 0:0:0:0:0:ffff:155b:8b4d
21.91.139.78 0:0:0:0:0:ffff:155b:8b4e
21.91.139.79 0:0:0:0:0:ffff:155b:8b4f
21.91.139.80 0:0:0:0:0:ffff:155b:8b50
21.91.139.81 0:0:0:0:0:ffff:155b:8b51
21.91.139.82 0:0:0:0:0:ffff:155b:8b52
21.91.139.83 0:0:0:0:0:ffff:155b:8b53
21.91.139.84 0:0:0:0:0:ffff:155b:8b54
21.91.139.85 0:0:0:0:0:ffff:155b:8b55
21.91.139.86 0:0:0:0:0:ffff:155b:8b56
21.91.139.87 0:0:0:0:0:ffff:155b:8b57
21.91.139.88 0:0:0:0:0:ffff:155b:8b58
21.91.139.89 0:0:0:0:0:ffff:155b:8b59
21.91.139.90 0:0:0:0:0:ffff:155b:8b5a
21.91.139.91 0:0:0:0:0:ffff:155b:8b5b
21.91.139.92 0:0:0:0:0:ffff:155b:8b5c
21.91.139.93 0:0:0:0:0:ffff:155b:8b5d
21.91.139.94 0:0:0:0:0:ffff:155b:8b5e
21.91.139.95 0:0:0:0:0:ffff:155b:8b5f
21.91.139.96 0:0:0:0:0:ffff:155b:8b60
21.91.139.97 0:0:0:0:0:ffff:155b:8b61
21.91.139.98 0:0:0:0:0:ffff:155b:8b62
21.91.139.99 0:0:0:0:0:ffff:155b:8b63
21.91.139.100 0:0:0:0:0:ffff:155b:8b64
21.91.139.101 0:0:0:0:0:ffff:155b:8b65
21.91.139.102 0:0:0:0:0:ffff:155b:8b66
21.91.139.103 0:0:0:0:0:ffff:155b:8b67
21.91.139.104 0:0:0:0:0:ffff:155b:8b68
21.91.139.105 0:0:0:0:0:ffff:155b:8b69
21.91.139.106 0:0:0:0:0:ffff:155b:8b6a
21.91.139.107 0:0:0:0:0:ffff:155b:8b6b
21.91.139.108 0:0:0:0:0:ffff:155b:8b6c
21.91.139.109 0:0:0:0:0:ffff:155b:8b6d
21.91.139.110 0:0:0:0:0:ffff:155b:8b6e
21.91.139.111 0:0:0:0:0:ffff:155b:8b6f
21.91.139.112 0:0:0:0:0:ffff:155b:8b70
21.91.139.113 0:0:0:0:0:ffff:155b:8b71
21.91.139.114 0:0:0:0:0:ffff:155b:8b72
21.91.139.115 0:0:0:0:0:ffff:155b:8b73
21.91.139.116 0:0:0:0:0:ffff:155b:8b74
21.91.139.117 0:0:0:0:0:ffff:155b:8b75
21.91.139.118 0:0:0:0:0:ffff:155b:8b76
21.91.139.119 0:0:0:0:0:ffff:155b:8b77
21.91.139.120 0:0:0:0:0:ffff:155b:8b78


21.91.139.121 0:0:0:0:0:ffff:155b:8b79
21.91.139.122 0:0:0:0:0:ffff:155b:8b7a
21.91.139.123 0:0:0:0:0:ffff:155b:8b7b
21.91.139.124 0:0:0:0:0:ffff:155b:8b7c
21.91.139.125 0:0:0:0:0:ffff:155b:8b7d
21.91.139.126 0:0:0:0:0:ffff:155b:8b7e
21.91.139.127 0:0:0:0:0:ffff:155b:8b7f
21.91.139.128 0:0:0:0:0:ffff:155b:8b80
21.91.139.129 0:0:0:0:0:ffff:155b:8b81
21.91.139.130 0:0:0:0:0:ffff:155b:8b82
21.91.139.131 0:0:0:0:0:ffff:155b:8b83
21.91.139.132 0:0:0:0:0:ffff:155b:8b84
21.91.139.133 0:0:0:0:0:ffff:155b:8b85
21.91.139.134 0:0:0:0:0:ffff:155b:8b86
21.91.139.135 0:0:0:0:0:ffff:155b:8b87
21.91.139.136 0:0:0:0:0:ffff:155b:8b88
21.91.139.137 0:0:0:0:0:ffff:155b:8b89
21.91.139.138 0:0:0:0:0:ffff:155b:8b8a
21.91.139.139 0:0:0:0:0:ffff:155b:8b8b
21.91.139.140 0:0:0:0:0:ffff:155b:8b8c
21.91.139.141 0:0:0:0:0:ffff:155b:8b8d
21.91.139.142 0:0:0:0:0:ffff:155b:8b8e
21.91.139.143 0:0:0:0:0:ffff:155b:8b8f
21.91.139.144 0:0:0:0:0:ffff:155b:8b90
21.91.139.145 0:0:0:0:0:ffff:155b:8b91
21.91.139.146 0:0:0:0:0:ffff:155b:8b92
21.91.139.147 0:0:0:0:0:ffff:155b:8b93
21.91.139.148 0:0:0:0:0:ffff:155b:8b94
21.91.139.149 0:0:0:0:0:ffff:155b:8b95
21.91.139.150 0:0:0:0:0:ffff:155b:8b96
21.91.139.151 0:0:0:0:0:ffff:155b:8b97
21.91.139.152 0:0:0:0:0:ffff:155b:8b98
21.91.139.153 0:0:0:0:0:ffff:155b:8b99
21.91.139.154 0:0:0:0:0:ffff:155b:8b9a
21.91.139.155 0:0:0:0:0:ffff:155b:8b9b
21.91.139.156 0:0:0:0:0:ffff:155b:8b9c
21.91.139.157 0:0:0:0:0:ffff:155b:8b9d
21.91.139.158 0:0:0:0:0:ffff:155b:8b9e
21.91.139.159 0:0:0:0:0:ffff:155b:8b9f
21.91.139.160 0:0:0:0:0:ffff:155b:8ba0
21.91.139.161 0:0:0:0:0:ffff:155b:8ba1
21.91.139.162 0:0:0:0:0:ffff:155b:8ba2
21.91.139.163 0:0:0:0:0:ffff:155b:8ba3
21.91.139.164 0:0:0:0:0:ffff:155b:8ba4
21.91.139.165 0:0:0:0:0:ffff:155b:8ba5
21.91.139.166 0:0:0:0:0:ffff:155b:8ba6
21.91.139.167 0:0:0:0:0:ffff:155b:8ba7
21.91.139.168 0:0:0:0:0:ffff:155b:8ba8
21.91.139.169 0:0:0:0:0:ffff:155b:8ba9
21.91.139.170 0:0:0:0:0:ffff:155b:8baa
21.91.139.171 0:0:0:0:0:ffff:155b:8bab
21.91.139.172 0:0:0:0:0:ffff:155b:8bac
21.91.139.173 0:0:0:0:0:ffff:155b:8bad
21.91.139.174 0:0:0:0:0:ffff:155b:8bae
21.91.139.175 0:0:0:0:0:ffff:155b:8baf
21.91.139.176 0:0:0:0:0:ffff:155b:8bb0
21.91.139.177 0:0:0:0:0:ffff:155b:8bb1
21.91.139.178 0:0:0:0:0:ffff:155b:8bb2
21.91.139.179 0:0:0:0:0:ffff:155b:8bb3
21.91.139.180 0:0:0:0:0:ffff:155b:8bb4


21.91.139.181 0:0:0:0:0:ffff:155b:8bb5
21.91.139.182 0:0:0:0:0:ffff:155b:8bb6
21.91.139.183 0:0:0:0:0:ffff:155b:8bb7
21.91.139.184 0:0:0:0:0:ffff:155b:8bb8
21.91.139.185 0:0:0:0:0:ffff:155b:8bb9
21.91.139.186 0:0:0:0:0:ffff:155b:8bba
21.91.139.187 0:0:0:0:0:ffff:155b:8bbb
21.91.139.188 0:0:0:0:0:ffff:155b:8bbc
21.91.139.189 0:0:0:0:0:ffff:155b:8bbd
21.91.139.190 0:0:0:0:0:ffff:155b:8bbe
21.91.139.191 0:0:0:0:0:ffff:155b:8bbf
21.91.139.192 0:0:0:0:0:ffff:155b:8bc0
21.91.139.193 0:0:0:0:0:ffff:155b:8bc1
21.91.139.194 0:0:0:0:0:ffff:155b:8bc2
21.91.139.195 0:0:0:0:0:ffff:155b:8bc3
21.91.139.196 0:0:0:0:0:ffff:155b:8bc4
21.91.139.197 0:0:0:0:0:ffff:155b:8bc5
21.91.139.198 0:0:0:0:0:ffff:155b:8bc6
21.91.139.199 0:0:0:0:0:ffff:155b:8bc7
21.91.139.200 0:0:0:0:0:ffff:155b:8bc8
21.91.139.201 0:0:0:0:0:ffff:155b:8bc9
21.91.139.202 0:0:0:0:0:ffff:155b:8bca
21.91.139.203 0:0:0:0:0:ffff:155b:8bcb
21.91.139.204 0:0:0:0:0:ffff:155b:8bcc
21.91.139.205 0:0:0:0:0:ffff:155b:8bcd
21.91.139.206 0:0:0:0:0:ffff:155b:8bce
21.91.139.207 0:0:0:0:0:ffff:155b:8bcf
21.91.139.208 0:0:0:0:0:ffff:155b:8bd0
21.91.139.209 0:0:0:0:0:ffff:155b:8bd1
21.91.139.210 0:0:0:0:0:ffff:155b:8bd2
21.91.139.211 0:0:0:0:0:ffff:155b:8bd3
21.91.139.212 0:0:0:0:0:ffff:155b:8bd4
21.91.139.213 0:0:0:0:0:ffff:155b:8bd5
21.91.139.214 0:0:0:0:0:ffff:155b:8bd6
21.91.139.215 0:0:0:0:0:ffff:155b:8bd7
21.91.139.216 0:0:0:0:0:ffff:155b:8bd8
21.91.139.217 0:0:0:0:0:ffff:155b:8bd9
21.91.139.218 0:0:0:0:0:ffff:155b:8bda
21.91.139.219 0:0:0:0:0:ffff:155b:8bdb
21.91.139.220 0:0:0:0:0:ffff:155b:8bdc
21.91.139.221 0:0:0:0:0:ffff:155b:8bdd
21.91.139.222 0:0:0:0:0:ffff:155b:8bde
21.91.139.223 0:0:0:0:0:ffff:155b:8bdf
21.91.139.224 0:0:0:0:0:ffff:155b:8be0
21.91.139.225 0:0:0:0:0:ffff:155b:8be1
21.91.139.226 0:0:0:0:0:ffff:155b:8be2
21.91.139.227 0:0:0:0:0:ffff:155b:8be3
21.91.139.228 0:0:0:0:0:ffff:155b:8be4
21.91.139.229 0:0:0:0:0:ffff:155b:8be5
21.91.139.230 0:0:0:0:0:ffff:155b:8be6
21.91.139.231 0:0:0:0:0:ffff:155b:8be7
21.91.139.232 0:0:0:0:0:ffff:155b:8be8
21.91.139.233 0:0:0:0:0:ffff:155b:8be9
21.91.139.234 0:0:0:0:0:ffff:155b:8bea
21.91.139.235 0:0:0:0:0:ffff:155b:8beb
21.91.139.236 0:0:0:0:0:ffff:155b:8bec
21.91.139.237 0:0:0:0:0:ffff:155b:8bed
21.91.139.238 0:0:0:0:0:ffff:155b:8bee
21.91.139.239 0:0:0:0:0:ffff:155b:8bef
21.91.139.240 0:0:0:0:0:ffff:155b:8bf0
21.91.139.241 0:0:0:0:0:ffff:155b:8bf1
21.91.139.242 0:0:0:0:0:ffff:155b:8bf2
21.91.139.243 0:0:0:0:0:ffff:155b:8bf3
21.91.139.244 0:0:0:0:0:ffff:155b:8bf4
21.91.139.245 0:0:0:0:0:ffff:155b:8bf5
21.91.139.246 0:0:0:0:0:ffff:155b:8bf6
21.91.139.247 0:0:0:0:0:ffff:155b:8bf7
21.91.139.248 0:0:0:0:0:ffff:155b:8bf8
21.91.139.249 0:0:0:0:0:ffff:155b:8bf9
21.91.139.250 0:0:0:0:0:ffff:155b:8bfa
21.91.139.251 0:0:0:0:0:ffff:155b:8bfb
21.91.139.252 0:0:0:0:0:ffff:155b:8bfc
21.91.139.253 0:0:0:0:0:ffff:155b:8bfd
21.91.139.254 0:0:0:0:0:ffff:155b:8bfe
21.91.139.255 0:0:0:0:0:ffff:155b:8bff


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.