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
21.15.215.1 0:0:0:0:0:ffff:150f:d701
21.15.215.2 0:0:0:0:0:ffff:150f:d702
21.15.215.3 0:0:0:0:0:ffff:150f:d703
21.15.215.4 0:0:0:0:0:ffff:150f:d704
21.15.215.5 0:0:0:0:0:ffff:150f:d705
21.15.215.6 0:0:0:0:0:ffff:150f:d706
21.15.215.7 0:0:0:0:0:ffff:150f:d707
21.15.215.8 0:0:0:0:0:ffff:150f:d708
21.15.215.9 0:0:0:0:0:ffff:150f:d709
21.15.215.10 0:0:0:0:0:ffff:150f:d70a
21.15.215.11 0:0:0:0:0:ffff:150f:d70b
21.15.215.12 0:0:0:0:0:ffff:150f:d70c
21.15.215.13 0:0:0:0:0:ffff:150f:d70d
21.15.215.14 0:0:0:0:0:ffff:150f:d70e
21.15.215.15 0:0:0:0:0:ffff:150f:d70f
21.15.215.16 0:0:0:0:0:ffff:150f:d710
21.15.215.17 0:0:0:0:0:ffff:150f:d711
21.15.215.18 0:0:0:0:0:ffff:150f:d712
21.15.215.19 0:0:0:0:0:ffff:150f:d713
21.15.215.20 0:0:0:0:0:ffff:150f:d714
21.15.215.21 0:0:0:0:0:ffff:150f:d715
21.15.215.22 0:0:0:0:0:ffff:150f:d716
21.15.215.23 0:0:0:0:0:ffff:150f:d717
21.15.215.24 0:0:0:0:0:ffff:150f:d718
21.15.215.25 0:0:0:0:0:ffff:150f:d719
21.15.215.26 0:0:0:0:0:ffff:150f:d71a
21.15.215.27 0:0:0:0:0:ffff:150f:d71b
21.15.215.28 0:0:0:0:0:ffff:150f:d71c
21.15.215.29 0:0:0:0:0:ffff:150f:d71d
21.15.215.30 0:0:0:0:0:ffff:150f:d71e
21.15.215.31 0:0:0:0:0:ffff:150f:d71f
21.15.215.32 0:0:0:0:0:ffff:150f:d720
21.15.215.33 0:0:0:0:0:ffff:150f:d721
21.15.215.34 0:0:0:0:0:ffff:150f:d722
21.15.215.35 0:0:0:0:0:ffff:150f:d723
21.15.215.36 0:0:0:0:0:ffff:150f:d724
21.15.215.37 0:0:0:0:0:ffff:150f:d725
21.15.215.38 0:0:0:0:0:ffff:150f:d726
21.15.215.39 0:0:0:0:0:ffff:150f:d727
21.15.215.40 0:0:0:0:0:ffff:150f:d728
21.15.215.41 0:0:0:0:0:ffff:150f:d729
21.15.215.42 0:0:0:0:0:ffff:150f:d72a
21.15.215.43 0:0:0:0:0:ffff:150f:d72b
21.15.215.44 0:0:0:0:0:ffff:150f:d72c
21.15.215.45 0:0:0:0:0:ffff:150f:d72d
21.15.215.46 0:0:0:0:0:ffff:150f:d72e
21.15.215.47 0:0:0:0:0:ffff:150f:d72f
21.15.215.48 0:0:0:0:0:ffff:150f:d730
21.15.215.49 0:0:0:0:0:ffff:150f:d731
21.15.215.50 0:0:0:0:0:ffff:150f:d732
21.15.215.51 0:0:0:0:0:ffff:150f:d733
21.15.215.52 0:0:0:0:0:ffff:150f:d734
21.15.215.53 0:0:0:0:0:ffff:150f:d735
21.15.215.54 0:0:0:0:0:ffff:150f:d736
21.15.215.55 0:0:0:0:0:ffff:150f:d737
21.15.215.56 0:0:0:0:0:ffff:150f:d738
21.15.215.57 0:0:0:0:0:ffff:150f:d739
21.15.215.58 0:0:0:0:0:ffff:150f:d73a
21.15.215.59 0:0:0:0:0:ffff:150f:d73b
21.15.215.60 0:0:0:0:0:ffff:150f:d73c


21.15.215.61 0:0:0:0:0:ffff:150f:d73d
21.15.215.62 0:0:0:0:0:ffff:150f:d73e
21.15.215.63 0:0:0:0:0:ffff:150f:d73f
21.15.215.64 0:0:0:0:0:ffff:150f:d740
21.15.215.65 0:0:0:0:0:ffff:150f:d741
21.15.215.66 0:0:0:0:0:ffff:150f:d742
21.15.215.67 0:0:0:0:0:ffff:150f:d743
21.15.215.68 0:0:0:0:0:ffff:150f:d744
21.15.215.69 0:0:0:0:0:ffff:150f:d745
21.15.215.70 0:0:0:0:0:ffff:150f:d746
21.15.215.71 0:0:0:0:0:ffff:150f:d747
21.15.215.72 0:0:0:0:0:ffff:150f:d748
21.15.215.73 0:0:0:0:0:ffff:150f:d749
21.15.215.74 0:0:0:0:0:ffff:150f:d74a
21.15.215.75 0:0:0:0:0:ffff:150f:d74b
21.15.215.76 0:0:0:0:0:ffff:150f:d74c
21.15.215.77 0:0:0:0:0:ffff:150f:d74d
21.15.215.78 0:0:0:0:0:ffff:150f:d74e
21.15.215.79 0:0:0:0:0:ffff:150f:d74f
21.15.215.80 0:0:0:0:0:ffff:150f:d750
21.15.215.81 0:0:0:0:0:ffff:150f:d751
21.15.215.82 0:0:0:0:0:ffff:150f:d752
21.15.215.83 0:0:0:0:0:ffff:150f:d753
21.15.215.84 0:0:0:0:0:ffff:150f:d754
21.15.215.85 0:0:0:0:0:ffff:150f:d755
21.15.215.86 0:0:0:0:0:ffff:150f:d756
21.15.215.87 0:0:0:0:0:ffff:150f:d757
21.15.215.88 0:0:0:0:0:ffff:150f:d758
21.15.215.89 0:0:0:0:0:ffff:150f:d759
21.15.215.90 0:0:0:0:0:ffff:150f:d75a
21.15.215.91 0:0:0:0:0:ffff:150f:d75b
21.15.215.92 0:0:0:0:0:ffff:150f:d75c
21.15.215.93 0:0:0:0:0:ffff:150f:d75d
21.15.215.94 0:0:0:0:0:ffff:150f:d75e
21.15.215.95 0:0:0:0:0:ffff:150f:d75f
21.15.215.96 0:0:0:0:0:ffff:150f:d760
21.15.215.97 0:0:0:0:0:ffff:150f:d761
21.15.215.98 0:0:0:0:0:ffff:150f:d762
21.15.215.99 0:0:0:0:0:ffff:150f:d763
21.15.215.100 0:0:0:0:0:ffff:150f:d764
21.15.215.101 0:0:0:0:0:ffff:150f:d765
21.15.215.102 0:0:0:0:0:ffff:150f:d766
21.15.215.103 0:0:0:0:0:ffff:150f:d767
21.15.215.104 0:0:0:0:0:ffff:150f:d768
21.15.215.105 0:0:0:0:0:ffff:150f:d769
21.15.215.106 0:0:0:0:0:ffff:150f:d76a
21.15.215.107 0:0:0:0:0:ffff:150f:d76b
21.15.215.108 0:0:0:0:0:ffff:150f:d76c
21.15.215.109 0:0:0:0:0:ffff:150f:d76d
21.15.215.110 0:0:0:0:0:ffff:150f:d76e
21.15.215.111 0:0:0:0:0:ffff:150f:d76f
21.15.215.112 0:0:0:0:0:ffff:150f:d770
21.15.215.113 0:0:0:0:0:ffff:150f:d771
21.15.215.114 0:0:0:0:0:ffff:150f:d772
21.15.215.115 0:0:0:0:0:ffff:150f:d773
21.15.215.116 0:0:0:0:0:ffff:150f:d774
21.15.215.117 0:0:0:0:0:ffff:150f:d775
21.15.215.118 0:0:0:0:0:ffff:150f:d776
21.15.215.119 0:0:0:0:0:ffff:150f:d777
21.15.215.120 0:0:0:0:0:ffff:150f:d778


21.15.215.121 0:0:0:0:0:ffff:150f:d779
21.15.215.122 0:0:0:0:0:ffff:150f:d77a
21.15.215.123 0:0:0:0:0:ffff:150f:d77b
21.15.215.124 0:0:0:0:0:ffff:150f:d77c
21.15.215.125 0:0:0:0:0:ffff:150f:d77d
21.15.215.126 0:0:0:0:0:ffff:150f:d77e
21.15.215.127 0:0:0:0:0:ffff:150f:d77f
21.15.215.128 0:0:0:0:0:ffff:150f:d780
21.15.215.129 0:0:0:0:0:ffff:150f:d781
21.15.215.130 0:0:0:0:0:ffff:150f:d782
21.15.215.131 0:0:0:0:0:ffff:150f:d783
21.15.215.132 0:0:0:0:0:ffff:150f:d784
21.15.215.133 0:0:0:0:0:ffff:150f:d785
21.15.215.134 0:0:0:0:0:ffff:150f:d786
21.15.215.135 0:0:0:0:0:ffff:150f:d787
21.15.215.136 0:0:0:0:0:ffff:150f:d788
21.15.215.137 0:0:0:0:0:ffff:150f:d789
21.15.215.138 0:0:0:0:0:ffff:150f:d78a
21.15.215.139 0:0:0:0:0:ffff:150f:d78b
21.15.215.140 0:0:0:0:0:ffff:150f:d78c
21.15.215.141 0:0:0:0:0:ffff:150f:d78d
21.15.215.142 0:0:0:0:0:ffff:150f:d78e
21.15.215.143 0:0:0:0:0:ffff:150f:d78f
21.15.215.144 0:0:0:0:0:ffff:150f:d790
21.15.215.145 0:0:0:0:0:ffff:150f:d791
21.15.215.146 0:0:0:0:0:ffff:150f:d792
21.15.215.147 0:0:0:0:0:ffff:150f:d793
21.15.215.148 0:0:0:0:0:ffff:150f:d794
21.15.215.149 0:0:0:0:0:ffff:150f:d795
21.15.215.150 0:0:0:0:0:ffff:150f:d796
21.15.215.151 0:0:0:0:0:ffff:150f:d797
21.15.215.152 0:0:0:0:0:ffff:150f:d798
21.15.215.153 0:0:0:0:0:ffff:150f:d799
21.15.215.154 0:0:0:0:0:ffff:150f:d79a
21.15.215.155 0:0:0:0:0:ffff:150f:d79b
21.15.215.156 0:0:0:0:0:ffff:150f:d79c
21.15.215.157 0:0:0:0:0:ffff:150f:d79d
21.15.215.158 0:0:0:0:0:ffff:150f:d79e
21.15.215.159 0:0:0:0:0:ffff:150f:d79f
21.15.215.160 0:0:0:0:0:ffff:150f:d7a0
21.15.215.161 0:0:0:0:0:ffff:150f:d7a1
21.15.215.162 0:0:0:0:0:ffff:150f:d7a2
21.15.215.163 0:0:0:0:0:ffff:150f:d7a3
21.15.215.164 0:0:0:0:0:ffff:150f:d7a4
21.15.215.165 0:0:0:0:0:ffff:150f:d7a5
21.15.215.166 0:0:0:0:0:ffff:150f:d7a6
21.15.215.167 0:0:0:0:0:ffff:150f:d7a7
21.15.215.168 0:0:0:0:0:ffff:150f:d7a8
21.15.215.169 0:0:0:0:0:ffff:150f:d7a9
21.15.215.170 0:0:0:0:0:ffff:150f:d7aa
21.15.215.171 0:0:0:0:0:ffff:150f:d7ab
21.15.215.172 0:0:0:0:0:ffff:150f:d7ac
21.15.215.173 0:0:0:0:0:ffff:150f:d7ad
21.15.215.174 0:0:0:0:0:ffff:150f:d7ae
21.15.215.175 0:0:0:0:0:ffff:150f:d7af
21.15.215.176 0:0:0:0:0:ffff:150f:d7b0
21.15.215.177 0:0:0:0:0:ffff:150f:d7b1
21.15.215.178 0:0:0:0:0:ffff:150f:d7b2
21.15.215.179 0:0:0:0:0:ffff:150f:d7b3
21.15.215.180 0:0:0:0:0:ffff:150f:d7b4


21.15.215.181 0:0:0:0:0:ffff:150f:d7b5
21.15.215.182 0:0:0:0:0:ffff:150f:d7b6
21.15.215.183 0:0:0:0:0:ffff:150f:d7b7
21.15.215.184 0:0:0:0:0:ffff:150f:d7b8
21.15.215.185 0:0:0:0:0:ffff:150f:d7b9
21.15.215.186 0:0:0:0:0:ffff:150f:d7ba
21.15.215.187 0:0:0:0:0:ffff:150f:d7bb
21.15.215.188 0:0:0:0:0:ffff:150f:d7bc
21.15.215.189 0:0:0:0:0:ffff:150f:d7bd
21.15.215.190 0:0:0:0:0:ffff:150f:d7be
21.15.215.191 0:0:0:0:0:ffff:150f:d7bf
21.15.215.192 0:0:0:0:0:ffff:150f:d7c0
21.15.215.193 0:0:0:0:0:ffff:150f:d7c1
21.15.215.194 0:0:0:0:0:ffff:150f:d7c2
21.15.215.195 0:0:0:0:0:ffff:150f:d7c3
21.15.215.196 0:0:0:0:0:ffff:150f:d7c4
21.15.215.197 0:0:0:0:0:ffff:150f:d7c5
21.15.215.198 0:0:0:0:0:ffff:150f:d7c6
21.15.215.199 0:0:0:0:0:ffff:150f:d7c7
21.15.215.200 0:0:0:0:0:ffff:150f:d7c8
21.15.215.201 0:0:0:0:0:ffff:150f:d7c9
21.15.215.202 0:0:0:0:0:ffff:150f:d7ca
21.15.215.203 0:0:0:0:0:ffff:150f:d7cb
21.15.215.204 0:0:0:0:0:ffff:150f:d7cc
21.15.215.205 0:0:0:0:0:ffff:150f:d7cd
21.15.215.206 0:0:0:0:0:ffff:150f:d7ce
21.15.215.207 0:0:0:0:0:ffff:150f:d7cf
21.15.215.208 0:0:0:0:0:ffff:150f:d7d0
21.15.215.209 0:0:0:0:0:ffff:150f:d7d1
21.15.215.210 0:0:0:0:0:ffff:150f:d7d2
21.15.215.211 0:0:0:0:0:ffff:150f:d7d3
21.15.215.212 0:0:0:0:0:ffff:150f:d7d4
21.15.215.213 0:0:0:0:0:ffff:150f:d7d5
21.15.215.214 0:0:0:0:0:ffff:150f:d7d6
21.15.215.215 0:0:0:0:0:ffff:150f:d7d7
21.15.215.216 0:0:0:0:0:ffff:150f:d7d8
21.15.215.217 0:0:0:0:0:ffff:150f:d7d9
21.15.215.218 0:0:0:0:0:ffff:150f:d7da
21.15.215.219 0:0:0:0:0:ffff:150f:d7db
21.15.215.220 0:0:0:0:0:ffff:150f:d7dc
21.15.215.221 0:0:0:0:0:ffff:150f:d7dd
21.15.215.222 0:0:0:0:0:ffff:150f:d7de
21.15.215.223 0:0:0:0:0:ffff:150f:d7df
21.15.215.224 0:0:0:0:0:ffff:150f:d7e0
21.15.215.225 0:0:0:0:0:ffff:150f:d7e1
21.15.215.226 0:0:0:0:0:ffff:150f:d7e2
21.15.215.227 0:0:0:0:0:ffff:150f:d7e3
21.15.215.228 0:0:0:0:0:ffff:150f:d7e4
21.15.215.229 0:0:0:0:0:ffff:150f:d7e5
21.15.215.230 0:0:0:0:0:ffff:150f:d7e6
21.15.215.231 0:0:0:0:0:ffff:150f:d7e7
21.15.215.232 0:0:0:0:0:ffff:150f:d7e8
21.15.215.233 0:0:0:0:0:ffff:150f:d7e9
21.15.215.234 0:0:0:0:0:ffff:150f:d7ea
21.15.215.235 0:0:0:0:0:ffff:150f:d7eb
21.15.215.236 0:0:0:0:0:ffff:150f:d7ec
21.15.215.237 0:0:0:0:0:ffff:150f:d7ed
21.15.215.238 0:0:0:0:0:ffff:150f:d7ee
21.15.215.239 0:0:0:0:0:ffff:150f:d7ef
21.15.215.240 0:0:0:0:0:ffff:150f:d7f0
21.15.215.241 0:0:0:0:0:ffff:150f:d7f1
21.15.215.242 0:0:0:0:0:ffff:150f:d7f2
21.15.215.243 0:0:0:0:0:ffff:150f:d7f3
21.15.215.244 0:0:0:0:0:ffff:150f:d7f4
21.15.215.245 0:0:0:0:0:ffff:150f:d7f5
21.15.215.246 0:0:0:0:0:ffff:150f:d7f6
21.15.215.247 0:0:0:0:0:ffff:150f:d7f7
21.15.215.248 0:0:0:0:0:ffff:150f:d7f8
21.15.215.249 0:0:0:0:0:ffff:150f:d7f9
21.15.215.250 0:0:0:0:0:ffff:150f:d7fa
21.15.215.251 0:0:0:0:0:ffff:150f:d7fb
21.15.215.252 0:0:0:0:0:ffff:150f:d7fc
21.15.215.253 0:0:0:0:0:ffff:150f:d7fd
21.15.215.254 0:0:0:0:0:ffff:150f:d7fe
21.15.215.255 0:0:0:0:0:ffff:150f:d7ff


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.