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
128.21.54.1 0:0:0:0:0:ffff:8015:3601
128.21.54.2 0:0:0:0:0:ffff:8015:3602
128.21.54.3 0:0:0:0:0:ffff:8015:3603
128.21.54.4 0:0:0:0:0:ffff:8015:3604
128.21.54.5 0:0:0:0:0:ffff:8015:3605
128.21.54.6 0:0:0:0:0:ffff:8015:3606
128.21.54.7 0:0:0:0:0:ffff:8015:3607
128.21.54.8 0:0:0:0:0:ffff:8015:3608
128.21.54.9 0:0:0:0:0:ffff:8015:3609
128.21.54.10 0:0:0:0:0:ffff:8015:360a
128.21.54.11 0:0:0:0:0:ffff:8015:360b
128.21.54.12 0:0:0:0:0:ffff:8015:360c
128.21.54.13 0:0:0:0:0:ffff:8015:360d
128.21.54.14 0:0:0:0:0:ffff:8015:360e
128.21.54.15 0:0:0:0:0:ffff:8015:360f
128.21.54.16 0:0:0:0:0:ffff:8015:3610
128.21.54.17 0:0:0:0:0:ffff:8015:3611
128.21.54.18 0:0:0:0:0:ffff:8015:3612
128.21.54.19 0:0:0:0:0:ffff:8015:3613
128.21.54.20 0:0:0:0:0:ffff:8015:3614
128.21.54.21 0:0:0:0:0:ffff:8015:3615
128.21.54.22 0:0:0:0:0:ffff:8015:3616
128.21.54.23 0:0:0:0:0:ffff:8015:3617
128.21.54.24 0:0:0:0:0:ffff:8015:3618
128.21.54.25 0:0:0:0:0:ffff:8015:3619
128.21.54.26 0:0:0:0:0:ffff:8015:361a
128.21.54.27 0:0:0:0:0:ffff:8015:361b
128.21.54.28 0:0:0:0:0:ffff:8015:361c
128.21.54.29 0:0:0:0:0:ffff:8015:361d
128.21.54.30 0:0:0:0:0:ffff:8015:361e
128.21.54.31 0:0:0:0:0:ffff:8015:361f
128.21.54.32 0:0:0:0:0:ffff:8015:3620
128.21.54.33 0:0:0:0:0:ffff:8015:3621
128.21.54.34 0:0:0:0:0:ffff:8015:3622
128.21.54.35 0:0:0:0:0:ffff:8015:3623
128.21.54.36 0:0:0:0:0:ffff:8015:3624
128.21.54.37 0:0:0:0:0:ffff:8015:3625
128.21.54.38 0:0:0:0:0:ffff:8015:3626
128.21.54.39 0:0:0:0:0:ffff:8015:3627
128.21.54.40 0:0:0:0:0:ffff:8015:3628
128.21.54.41 0:0:0:0:0:ffff:8015:3629
128.21.54.42 0:0:0:0:0:ffff:8015:362a
128.21.54.43 0:0:0:0:0:ffff:8015:362b
128.21.54.44 0:0:0:0:0:ffff:8015:362c
128.21.54.45 0:0:0:0:0:ffff:8015:362d
128.21.54.46 0:0:0:0:0:ffff:8015:362e
128.21.54.47 0:0:0:0:0:ffff:8015:362f
128.21.54.48 0:0:0:0:0:ffff:8015:3630
128.21.54.49 0:0:0:0:0:ffff:8015:3631
128.21.54.50 0:0:0:0:0:ffff:8015:3632
128.21.54.51 0:0:0:0:0:ffff:8015:3633
128.21.54.52 0:0:0:0:0:ffff:8015:3634
128.21.54.53 0:0:0:0:0:ffff:8015:3635
128.21.54.54 0:0:0:0:0:ffff:8015:3636
128.21.54.55 0:0:0:0:0:ffff:8015:3637
128.21.54.56 0:0:0:0:0:ffff:8015:3638
128.21.54.57 0:0:0:0:0:ffff:8015:3639
128.21.54.58 0:0:0:0:0:ffff:8015:363a
128.21.54.59 0:0:0:0:0:ffff:8015:363b
128.21.54.60 0:0:0:0:0:ffff:8015:363c


128.21.54.61 0:0:0:0:0:ffff:8015:363d
128.21.54.62 0:0:0:0:0:ffff:8015:363e
128.21.54.63 0:0:0:0:0:ffff:8015:363f
128.21.54.64 0:0:0:0:0:ffff:8015:3640
128.21.54.65 0:0:0:0:0:ffff:8015:3641
128.21.54.66 0:0:0:0:0:ffff:8015:3642
128.21.54.67 0:0:0:0:0:ffff:8015:3643
128.21.54.68 0:0:0:0:0:ffff:8015:3644
128.21.54.69 0:0:0:0:0:ffff:8015:3645
128.21.54.70 0:0:0:0:0:ffff:8015:3646
128.21.54.71 0:0:0:0:0:ffff:8015:3647
128.21.54.72 0:0:0:0:0:ffff:8015:3648
128.21.54.73 0:0:0:0:0:ffff:8015:3649
128.21.54.74 0:0:0:0:0:ffff:8015:364a
128.21.54.75 0:0:0:0:0:ffff:8015:364b
128.21.54.76 0:0:0:0:0:ffff:8015:364c
128.21.54.77 0:0:0:0:0:ffff:8015:364d
128.21.54.78 0:0:0:0:0:ffff:8015:364e
128.21.54.79 0:0:0:0:0:ffff:8015:364f
128.21.54.80 0:0:0:0:0:ffff:8015:3650
128.21.54.81 0:0:0:0:0:ffff:8015:3651
128.21.54.82 0:0:0:0:0:ffff:8015:3652
128.21.54.83 0:0:0:0:0:ffff:8015:3653
128.21.54.84 0:0:0:0:0:ffff:8015:3654
128.21.54.85 0:0:0:0:0:ffff:8015:3655
128.21.54.86 0:0:0:0:0:ffff:8015:3656
128.21.54.87 0:0:0:0:0:ffff:8015:3657
128.21.54.88 0:0:0:0:0:ffff:8015:3658
128.21.54.89 0:0:0:0:0:ffff:8015:3659
128.21.54.90 0:0:0:0:0:ffff:8015:365a
128.21.54.91 0:0:0:0:0:ffff:8015:365b
128.21.54.92 0:0:0:0:0:ffff:8015:365c
128.21.54.93 0:0:0:0:0:ffff:8015:365d
128.21.54.94 0:0:0:0:0:ffff:8015:365e
128.21.54.95 0:0:0:0:0:ffff:8015:365f
128.21.54.96 0:0:0:0:0:ffff:8015:3660
128.21.54.97 0:0:0:0:0:ffff:8015:3661
128.21.54.98 0:0:0:0:0:ffff:8015:3662
128.21.54.99 0:0:0:0:0:ffff:8015:3663
128.21.54.100 0:0:0:0:0:ffff:8015:3664
128.21.54.101 0:0:0:0:0:ffff:8015:3665
128.21.54.102 0:0:0:0:0:ffff:8015:3666
128.21.54.103 0:0:0:0:0:ffff:8015:3667
128.21.54.104 0:0:0:0:0:ffff:8015:3668
128.21.54.105 0:0:0:0:0:ffff:8015:3669
128.21.54.106 0:0:0:0:0:ffff:8015:366a
128.21.54.107 0:0:0:0:0:ffff:8015:366b
128.21.54.108 0:0:0:0:0:ffff:8015:366c
128.21.54.109 0:0:0:0:0:ffff:8015:366d
128.21.54.110 0:0:0:0:0:ffff:8015:366e
128.21.54.111 0:0:0:0:0:ffff:8015:366f
128.21.54.112 0:0:0:0:0:ffff:8015:3670
128.21.54.113 0:0:0:0:0:ffff:8015:3671
128.21.54.114 0:0:0:0:0:ffff:8015:3672
128.21.54.115 0:0:0:0:0:ffff:8015:3673
128.21.54.116 0:0:0:0:0:ffff:8015:3674
128.21.54.117 0:0:0:0:0:ffff:8015:3675
128.21.54.118 0:0:0:0:0:ffff:8015:3676
128.21.54.119 0:0:0:0:0:ffff:8015:3677
128.21.54.120 0:0:0:0:0:ffff:8015:3678


128.21.54.121 0:0:0:0:0:ffff:8015:3679
128.21.54.122 0:0:0:0:0:ffff:8015:367a
128.21.54.123 0:0:0:0:0:ffff:8015:367b
128.21.54.124 0:0:0:0:0:ffff:8015:367c
128.21.54.125 0:0:0:0:0:ffff:8015:367d
128.21.54.126 0:0:0:0:0:ffff:8015:367e
128.21.54.127 0:0:0:0:0:ffff:8015:367f
128.21.54.128 0:0:0:0:0:ffff:8015:3680
128.21.54.129 0:0:0:0:0:ffff:8015:3681
128.21.54.130 0:0:0:0:0:ffff:8015:3682
128.21.54.131 0:0:0:0:0:ffff:8015:3683
128.21.54.132 0:0:0:0:0:ffff:8015:3684
128.21.54.133 0:0:0:0:0:ffff:8015:3685
128.21.54.134 0:0:0:0:0:ffff:8015:3686
128.21.54.135 0:0:0:0:0:ffff:8015:3687
128.21.54.136 0:0:0:0:0:ffff:8015:3688
128.21.54.137 0:0:0:0:0:ffff:8015:3689
128.21.54.138 0:0:0:0:0:ffff:8015:368a
128.21.54.139 0:0:0:0:0:ffff:8015:368b
128.21.54.140 0:0:0:0:0:ffff:8015:368c
128.21.54.141 0:0:0:0:0:ffff:8015:368d
128.21.54.142 0:0:0:0:0:ffff:8015:368e
128.21.54.143 0:0:0:0:0:ffff:8015:368f
128.21.54.144 0:0:0:0:0:ffff:8015:3690
128.21.54.145 0:0:0:0:0:ffff:8015:3691
128.21.54.146 0:0:0:0:0:ffff:8015:3692
128.21.54.147 0:0:0:0:0:ffff:8015:3693
128.21.54.148 0:0:0:0:0:ffff:8015:3694
128.21.54.149 0:0:0:0:0:ffff:8015:3695
128.21.54.150 0:0:0:0:0:ffff:8015:3696
128.21.54.151 0:0:0:0:0:ffff:8015:3697
128.21.54.152 0:0:0:0:0:ffff:8015:3698
128.21.54.153 0:0:0:0:0:ffff:8015:3699
128.21.54.154 0:0:0:0:0:ffff:8015:369a
128.21.54.155 0:0:0:0:0:ffff:8015:369b
128.21.54.156 0:0:0:0:0:ffff:8015:369c
128.21.54.157 0:0:0:0:0:ffff:8015:369d
128.21.54.158 0:0:0:0:0:ffff:8015:369e
128.21.54.159 0:0:0:0:0:ffff:8015:369f
128.21.54.160 0:0:0:0:0:ffff:8015:36a0
128.21.54.161 0:0:0:0:0:ffff:8015:36a1
128.21.54.162 0:0:0:0:0:ffff:8015:36a2
128.21.54.163 0:0:0:0:0:ffff:8015:36a3
128.21.54.164 0:0:0:0:0:ffff:8015:36a4
128.21.54.165 0:0:0:0:0:ffff:8015:36a5
128.21.54.166 0:0:0:0:0:ffff:8015:36a6
128.21.54.167 0:0:0:0:0:ffff:8015:36a7
128.21.54.168 0:0:0:0:0:ffff:8015:36a8
128.21.54.169 0:0:0:0:0:ffff:8015:36a9
128.21.54.170 0:0:0:0:0:ffff:8015:36aa
128.21.54.171 0:0:0:0:0:ffff:8015:36ab
128.21.54.172 0:0:0:0:0:ffff:8015:36ac
128.21.54.173 0:0:0:0:0:ffff:8015:36ad
128.21.54.174 0:0:0:0:0:ffff:8015:36ae
128.21.54.175 0:0:0:0:0:ffff:8015:36af
128.21.54.176 0:0:0:0:0:ffff:8015:36b0
128.21.54.177 0:0:0:0:0:ffff:8015:36b1
128.21.54.178 0:0:0:0:0:ffff:8015:36b2
128.21.54.179 0:0:0:0:0:ffff:8015:36b3
128.21.54.180 0:0:0:0:0:ffff:8015:36b4


128.21.54.181 0:0:0:0:0:ffff:8015:36b5
128.21.54.182 0:0:0:0:0:ffff:8015:36b6
128.21.54.183 0:0:0:0:0:ffff:8015:36b7
128.21.54.184 0:0:0:0:0:ffff:8015:36b8
128.21.54.185 0:0:0:0:0:ffff:8015:36b9
128.21.54.186 0:0:0:0:0:ffff:8015:36ba
128.21.54.187 0:0:0:0:0:ffff:8015:36bb
128.21.54.188 0:0:0:0:0:ffff:8015:36bc
128.21.54.189 0:0:0:0:0:ffff:8015:36bd
128.21.54.190 0:0:0:0:0:ffff:8015:36be
128.21.54.191 0:0:0:0:0:ffff:8015:36bf
128.21.54.192 0:0:0:0:0:ffff:8015:36c0
128.21.54.193 0:0:0:0:0:ffff:8015:36c1
128.21.54.194 0:0:0:0:0:ffff:8015:36c2
128.21.54.195 0:0:0:0:0:ffff:8015:36c3
128.21.54.196 0:0:0:0:0:ffff:8015:36c4
128.21.54.197 0:0:0:0:0:ffff:8015:36c5
128.21.54.198 0:0:0:0:0:ffff:8015:36c6
128.21.54.199 0:0:0:0:0:ffff:8015:36c7
128.21.54.200 0:0:0:0:0:ffff:8015:36c8
128.21.54.201 0:0:0:0:0:ffff:8015:36c9
128.21.54.202 0:0:0:0:0:ffff:8015:36ca
128.21.54.203 0:0:0:0:0:ffff:8015:36cb
128.21.54.204 0:0:0:0:0:ffff:8015:36cc
128.21.54.205 0:0:0:0:0:ffff:8015:36cd
128.21.54.206 0:0:0:0:0:ffff:8015:36ce
128.21.54.207 0:0:0:0:0:ffff:8015:36cf
128.21.54.208 0:0:0:0:0:ffff:8015:36d0
128.21.54.209 0:0:0:0:0:ffff:8015:36d1
128.21.54.210 0:0:0:0:0:ffff:8015:36d2
128.21.54.211 0:0:0:0:0:ffff:8015:36d3
128.21.54.212 0:0:0:0:0:ffff:8015:36d4
128.21.54.213 0:0:0:0:0:ffff:8015:36d5
128.21.54.214 0:0:0:0:0:ffff:8015:36d6
128.21.54.215 0:0:0:0:0:ffff:8015:36d7
128.21.54.216 0:0:0:0:0:ffff:8015:36d8
128.21.54.217 0:0:0:0:0:ffff:8015:36d9
128.21.54.218 0:0:0:0:0:ffff:8015:36da
128.21.54.219 0:0:0:0:0:ffff:8015:36db
128.21.54.220 0:0:0:0:0:ffff:8015:36dc
128.21.54.221 0:0:0:0:0:ffff:8015:36dd
128.21.54.222 0:0:0:0:0:ffff:8015:36de
128.21.54.223 0:0:0:0:0:ffff:8015:36df
128.21.54.224 0:0:0:0:0:ffff:8015:36e0
128.21.54.225 0:0:0:0:0:ffff:8015:36e1
128.21.54.226 0:0:0:0:0:ffff:8015:36e2
128.21.54.227 0:0:0:0:0:ffff:8015:36e3
128.21.54.228 0:0:0:0:0:ffff:8015:36e4
128.21.54.229 0:0:0:0:0:ffff:8015:36e5
128.21.54.230 0:0:0:0:0:ffff:8015:36e6
128.21.54.231 0:0:0:0:0:ffff:8015:36e7
128.21.54.232 0:0:0:0:0:ffff:8015:36e8
128.21.54.233 0:0:0:0:0:ffff:8015:36e9
128.21.54.234 0:0:0:0:0:ffff:8015:36ea
128.21.54.235 0:0:0:0:0:ffff:8015:36eb
128.21.54.236 0:0:0:0:0:ffff:8015:36ec
128.21.54.237 0:0:0:0:0:ffff:8015:36ed
128.21.54.238 0:0:0:0:0:ffff:8015:36ee
128.21.54.239 0:0:0:0:0:ffff:8015:36ef
128.21.54.240 0:0:0:0:0:ffff:8015:36f0
128.21.54.241 0:0:0:0:0:ffff:8015:36f1
128.21.54.242 0:0:0:0:0:ffff:8015:36f2
128.21.54.243 0:0:0:0:0:ffff:8015:36f3
128.21.54.244 0:0:0:0:0:ffff:8015:36f4
128.21.54.245 0:0:0:0:0:ffff:8015:36f5
128.21.54.246 0:0:0:0:0:ffff:8015:36f6
128.21.54.247 0:0:0:0:0:ffff:8015:36f7
128.21.54.248 0:0:0:0:0:ffff:8015:36f8
128.21.54.249 0:0:0:0:0:ffff:8015:36f9
128.21.54.250 0:0:0:0:0:ffff:8015:36fa
128.21.54.251 0:0:0:0:0:ffff:8015:36fb
128.21.54.252 0:0:0:0:0:ffff:8015:36fc
128.21.54.253 0:0:0:0:0:ffff:8015:36fd
128.21.54.254 0:0:0:0:0:ffff:8015:36fe
128.21.54.255 0:0:0:0:0:ffff:8015:36ff


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.