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
18.21.38.1 0:0:0:0:0:ffff:1215:2601
18.21.38.2 0:0:0:0:0:ffff:1215:2602
18.21.38.3 0:0:0:0:0:ffff:1215:2603
18.21.38.4 0:0:0:0:0:ffff:1215:2604
18.21.38.5 0:0:0:0:0:ffff:1215:2605
18.21.38.6 0:0:0:0:0:ffff:1215:2606
18.21.38.7 0:0:0:0:0:ffff:1215:2607
18.21.38.8 0:0:0:0:0:ffff:1215:2608
18.21.38.9 0:0:0:0:0:ffff:1215:2609
18.21.38.10 0:0:0:0:0:ffff:1215:260a
18.21.38.11 0:0:0:0:0:ffff:1215:260b
18.21.38.12 0:0:0:0:0:ffff:1215:260c
18.21.38.13 0:0:0:0:0:ffff:1215:260d
18.21.38.14 0:0:0:0:0:ffff:1215:260e
18.21.38.15 0:0:0:0:0:ffff:1215:260f
18.21.38.16 0:0:0:0:0:ffff:1215:2610
18.21.38.17 0:0:0:0:0:ffff:1215:2611
18.21.38.18 0:0:0:0:0:ffff:1215:2612
18.21.38.19 0:0:0:0:0:ffff:1215:2613
18.21.38.20 0:0:0:0:0:ffff:1215:2614
18.21.38.21 0:0:0:0:0:ffff:1215:2615
18.21.38.22 0:0:0:0:0:ffff:1215:2616
18.21.38.23 0:0:0:0:0:ffff:1215:2617
18.21.38.24 0:0:0:0:0:ffff:1215:2618
18.21.38.25 0:0:0:0:0:ffff:1215:2619
18.21.38.26 0:0:0:0:0:ffff:1215:261a
18.21.38.27 0:0:0:0:0:ffff:1215:261b
18.21.38.28 0:0:0:0:0:ffff:1215:261c
18.21.38.29 0:0:0:0:0:ffff:1215:261d
18.21.38.30 0:0:0:0:0:ffff:1215:261e
18.21.38.31 0:0:0:0:0:ffff:1215:261f
18.21.38.32 0:0:0:0:0:ffff:1215:2620
18.21.38.33 0:0:0:0:0:ffff:1215:2621
18.21.38.34 0:0:0:0:0:ffff:1215:2622
18.21.38.35 0:0:0:0:0:ffff:1215:2623
18.21.38.36 0:0:0:0:0:ffff:1215:2624
18.21.38.37 0:0:0:0:0:ffff:1215:2625
18.21.38.38 0:0:0:0:0:ffff:1215:2626
18.21.38.39 0:0:0:0:0:ffff:1215:2627
18.21.38.40 0:0:0:0:0:ffff:1215:2628
18.21.38.41 0:0:0:0:0:ffff:1215:2629
18.21.38.42 0:0:0:0:0:ffff:1215:262a
18.21.38.43 0:0:0:0:0:ffff:1215:262b
18.21.38.44 0:0:0:0:0:ffff:1215:262c
18.21.38.45 0:0:0:0:0:ffff:1215:262d
18.21.38.46 0:0:0:0:0:ffff:1215:262e
18.21.38.47 0:0:0:0:0:ffff:1215:262f
18.21.38.48 0:0:0:0:0:ffff:1215:2630
18.21.38.49 0:0:0:0:0:ffff:1215:2631
18.21.38.50 0:0:0:0:0:ffff:1215:2632
18.21.38.51 0:0:0:0:0:ffff:1215:2633
18.21.38.52 0:0:0:0:0:ffff:1215:2634
18.21.38.53 0:0:0:0:0:ffff:1215:2635
18.21.38.54 0:0:0:0:0:ffff:1215:2636
18.21.38.55 0:0:0:0:0:ffff:1215:2637
18.21.38.56 0:0:0:0:0:ffff:1215:2638
18.21.38.57 0:0:0:0:0:ffff:1215:2639
18.21.38.58 0:0:0:0:0:ffff:1215:263a
18.21.38.59 0:0:0:0:0:ffff:1215:263b
18.21.38.60 0:0:0:0:0:ffff:1215:263c


18.21.38.61 0:0:0:0:0:ffff:1215:263d
18.21.38.62 0:0:0:0:0:ffff:1215:263e
18.21.38.63 0:0:0:0:0:ffff:1215:263f
18.21.38.64 0:0:0:0:0:ffff:1215:2640
18.21.38.65 0:0:0:0:0:ffff:1215:2641
18.21.38.66 0:0:0:0:0:ffff:1215:2642
18.21.38.67 0:0:0:0:0:ffff:1215:2643
18.21.38.68 0:0:0:0:0:ffff:1215:2644
18.21.38.69 0:0:0:0:0:ffff:1215:2645
18.21.38.70 0:0:0:0:0:ffff:1215:2646
18.21.38.71 0:0:0:0:0:ffff:1215:2647
18.21.38.72 0:0:0:0:0:ffff:1215:2648
18.21.38.73 0:0:0:0:0:ffff:1215:2649
18.21.38.74 0:0:0:0:0:ffff:1215:264a
18.21.38.75 0:0:0:0:0:ffff:1215:264b
18.21.38.76 0:0:0:0:0:ffff:1215:264c
18.21.38.77 0:0:0:0:0:ffff:1215:264d
18.21.38.78 0:0:0:0:0:ffff:1215:264e
18.21.38.79 0:0:0:0:0:ffff:1215:264f
18.21.38.80 0:0:0:0:0:ffff:1215:2650
18.21.38.81 0:0:0:0:0:ffff:1215:2651
18.21.38.82 0:0:0:0:0:ffff:1215:2652
18.21.38.83 0:0:0:0:0:ffff:1215:2653
18.21.38.84 0:0:0:0:0:ffff:1215:2654
18.21.38.85 0:0:0:0:0:ffff:1215:2655
18.21.38.86 0:0:0:0:0:ffff:1215:2656
18.21.38.87 0:0:0:0:0:ffff:1215:2657
18.21.38.88 0:0:0:0:0:ffff:1215:2658
18.21.38.89 0:0:0:0:0:ffff:1215:2659
18.21.38.90 0:0:0:0:0:ffff:1215:265a
18.21.38.91 0:0:0:0:0:ffff:1215:265b
18.21.38.92 0:0:0:0:0:ffff:1215:265c
18.21.38.93 0:0:0:0:0:ffff:1215:265d
18.21.38.94 0:0:0:0:0:ffff:1215:265e
18.21.38.95 0:0:0:0:0:ffff:1215:265f
18.21.38.96 0:0:0:0:0:ffff:1215:2660
18.21.38.97 0:0:0:0:0:ffff:1215:2661
18.21.38.98 0:0:0:0:0:ffff:1215:2662
18.21.38.99 0:0:0:0:0:ffff:1215:2663
18.21.38.100 0:0:0:0:0:ffff:1215:2664
18.21.38.101 0:0:0:0:0:ffff:1215:2665
18.21.38.102 0:0:0:0:0:ffff:1215:2666
18.21.38.103 0:0:0:0:0:ffff:1215:2667
18.21.38.104 0:0:0:0:0:ffff:1215:2668
18.21.38.105 0:0:0:0:0:ffff:1215:2669
18.21.38.106 0:0:0:0:0:ffff:1215:266a
18.21.38.107 0:0:0:0:0:ffff:1215:266b
18.21.38.108 0:0:0:0:0:ffff:1215:266c
18.21.38.109 0:0:0:0:0:ffff:1215:266d
18.21.38.110 0:0:0:0:0:ffff:1215:266e
18.21.38.111 0:0:0:0:0:ffff:1215:266f
18.21.38.112 0:0:0:0:0:ffff:1215:2670
18.21.38.113 0:0:0:0:0:ffff:1215:2671
18.21.38.114 0:0:0:0:0:ffff:1215:2672
18.21.38.115 0:0:0:0:0:ffff:1215:2673
18.21.38.116 0:0:0:0:0:ffff:1215:2674
18.21.38.117 0:0:0:0:0:ffff:1215:2675
18.21.38.118 0:0:0:0:0:ffff:1215:2676
18.21.38.119 0:0:0:0:0:ffff:1215:2677
18.21.38.120 0:0:0:0:0:ffff:1215:2678


18.21.38.121 0:0:0:0:0:ffff:1215:2679
18.21.38.122 0:0:0:0:0:ffff:1215:267a
18.21.38.123 0:0:0:0:0:ffff:1215:267b
18.21.38.124 0:0:0:0:0:ffff:1215:267c
18.21.38.125 0:0:0:0:0:ffff:1215:267d
18.21.38.126 0:0:0:0:0:ffff:1215:267e
18.21.38.127 0:0:0:0:0:ffff:1215:267f
18.21.38.128 0:0:0:0:0:ffff:1215:2680
18.21.38.129 0:0:0:0:0:ffff:1215:2681
18.21.38.130 0:0:0:0:0:ffff:1215:2682
18.21.38.131 0:0:0:0:0:ffff:1215:2683
18.21.38.132 0:0:0:0:0:ffff:1215:2684
18.21.38.133 0:0:0:0:0:ffff:1215:2685
18.21.38.134 0:0:0:0:0:ffff:1215:2686
18.21.38.135 0:0:0:0:0:ffff:1215:2687
18.21.38.136 0:0:0:0:0:ffff:1215:2688
18.21.38.137 0:0:0:0:0:ffff:1215:2689
18.21.38.138 0:0:0:0:0:ffff:1215:268a
18.21.38.139 0:0:0:0:0:ffff:1215:268b
18.21.38.140 0:0:0:0:0:ffff:1215:268c
18.21.38.141 0:0:0:0:0:ffff:1215:268d
18.21.38.142 0:0:0:0:0:ffff:1215:268e
18.21.38.143 0:0:0:0:0:ffff:1215:268f
18.21.38.144 0:0:0:0:0:ffff:1215:2690
18.21.38.145 0:0:0:0:0:ffff:1215:2691
18.21.38.146 0:0:0:0:0:ffff:1215:2692
18.21.38.147 0:0:0:0:0:ffff:1215:2693
18.21.38.148 0:0:0:0:0:ffff:1215:2694
18.21.38.149 0:0:0:0:0:ffff:1215:2695
18.21.38.150 0:0:0:0:0:ffff:1215:2696
18.21.38.151 0:0:0:0:0:ffff:1215:2697
18.21.38.152 0:0:0:0:0:ffff:1215:2698
18.21.38.153 0:0:0:0:0:ffff:1215:2699
18.21.38.154 0:0:0:0:0:ffff:1215:269a
18.21.38.155 0:0:0:0:0:ffff:1215:269b
18.21.38.156 0:0:0:0:0:ffff:1215:269c
18.21.38.157 0:0:0:0:0:ffff:1215:269d
18.21.38.158 0:0:0:0:0:ffff:1215:269e
18.21.38.159 0:0:0:0:0:ffff:1215:269f
18.21.38.160 0:0:0:0:0:ffff:1215:26a0
18.21.38.161 0:0:0:0:0:ffff:1215:26a1
18.21.38.162 0:0:0:0:0:ffff:1215:26a2
18.21.38.163 0:0:0:0:0:ffff:1215:26a3
18.21.38.164 0:0:0:0:0:ffff:1215:26a4
18.21.38.165 0:0:0:0:0:ffff:1215:26a5
18.21.38.166 0:0:0:0:0:ffff:1215:26a6
18.21.38.167 0:0:0:0:0:ffff:1215:26a7
18.21.38.168 0:0:0:0:0:ffff:1215:26a8
18.21.38.169 0:0:0:0:0:ffff:1215:26a9
18.21.38.170 0:0:0:0:0:ffff:1215:26aa
18.21.38.171 0:0:0:0:0:ffff:1215:26ab
18.21.38.172 0:0:0:0:0:ffff:1215:26ac
18.21.38.173 0:0:0:0:0:ffff:1215:26ad
18.21.38.174 0:0:0:0:0:ffff:1215:26ae
18.21.38.175 0:0:0:0:0:ffff:1215:26af
18.21.38.176 0:0:0:0:0:ffff:1215:26b0
18.21.38.177 0:0:0:0:0:ffff:1215:26b1
18.21.38.178 0:0:0:0:0:ffff:1215:26b2
18.21.38.179 0:0:0:0:0:ffff:1215:26b3
18.21.38.180 0:0:0:0:0:ffff:1215:26b4


18.21.38.181 0:0:0:0:0:ffff:1215:26b5
18.21.38.182 0:0:0:0:0:ffff:1215:26b6
18.21.38.183 0:0:0:0:0:ffff:1215:26b7
18.21.38.184 0:0:0:0:0:ffff:1215:26b8
18.21.38.185 0:0:0:0:0:ffff:1215:26b9
18.21.38.186 0:0:0:0:0:ffff:1215:26ba
18.21.38.187 0:0:0:0:0:ffff:1215:26bb
18.21.38.188 0:0:0:0:0:ffff:1215:26bc
18.21.38.189 0:0:0:0:0:ffff:1215:26bd
18.21.38.190 0:0:0:0:0:ffff:1215:26be
18.21.38.191 0:0:0:0:0:ffff:1215:26bf
18.21.38.192 0:0:0:0:0:ffff:1215:26c0
18.21.38.193 0:0:0:0:0:ffff:1215:26c1
18.21.38.194 0:0:0:0:0:ffff:1215:26c2
18.21.38.195 0:0:0:0:0:ffff:1215:26c3
18.21.38.196 0:0:0:0:0:ffff:1215:26c4
18.21.38.197 0:0:0:0:0:ffff:1215:26c5
18.21.38.198 0:0:0:0:0:ffff:1215:26c6
18.21.38.199 0:0:0:0:0:ffff:1215:26c7
18.21.38.200 0:0:0:0:0:ffff:1215:26c8
18.21.38.201 0:0:0:0:0:ffff:1215:26c9
18.21.38.202 0:0:0:0:0:ffff:1215:26ca
18.21.38.203 0:0:0:0:0:ffff:1215:26cb
18.21.38.204 0:0:0:0:0:ffff:1215:26cc
18.21.38.205 0:0:0:0:0:ffff:1215:26cd
18.21.38.206 0:0:0:0:0:ffff:1215:26ce
18.21.38.207 0:0:0:0:0:ffff:1215:26cf
18.21.38.208 0:0:0:0:0:ffff:1215:26d0
18.21.38.209 0:0:0:0:0:ffff:1215:26d1
18.21.38.210 0:0:0:0:0:ffff:1215:26d2
18.21.38.211 0:0:0:0:0:ffff:1215:26d3
18.21.38.212 0:0:0:0:0:ffff:1215:26d4
18.21.38.213 0:0:0:0:0:ffff:1215:26d5
18.21.38.214 0:0:0:0:0:ffff:1215:26d6
18.21.38.215 0:0:0:0:0:ffff:1215:26d7
18.21.38.216 0:0:0:0:0:ffff:1215:26d8
18.21.38.217 0:0:0:0:0:ffff:1215:26d9
18.21.38.218 0:0:0:0:0:ffff:1215:26da
18.21.38.219 0:0:0:0:0:ffff:1215:26db
18.21.38.220 0:0:0:0:0:ffff:1215:26dc
18.21.38.221 0:0:0:0:0:ffff:1215:26dd
18.21.38.222 0:0:0:0:0:ffff:1215:26de
18.21.38.223 0:0:0:0:0:ffff:1215:26df
18.21.38.224 0:0:0:0:0:ffff:1215:26e0
18.21.38.225 0:0:0:0:0:ffff:1215:26e1
18.21.38.226 0:0:0:0:0:ffff:1215:26e2
18.21.38.227 0:0:0:0:0:ffff:1215:26e3
18.21.38.228 0:0:0:0:0:ffff:1215:26e4
18.21.38.229 0:0:0:0:0:ffff:1215:26e5
18.21.38.230 0:0:0:0:0:ffff:1215:26e6
18.21.38.231 0:0:0:0:0:ffff:1215:26e7
18.21.38.232 0:0:0:0:0:ffff:1215:26e8
18.21.38.233 0:0:0:0:0:ffff:1215:26e9
18.21.38.234 0:0:0:0:0:ffff:1215:26ea
18.21.38.235 0:0:0:0:0:ffff:1215:26eb
18.21.38.236 0:0:0:0:0:ffff:1215:26ec
18.21.38.237 0:0:0:0:0:ffff:1215:26ed
18.21.38.238 0:0:0:0:0:ffff:1215:26ee
18.21.38.239 0:0:0:0:0:ffff:1215:26ef
18.21.38.240 0:0:0:0:0:ffff:1215:26f0
18.21.38.241 0:0:0:0:0:ffff:1215:26f1
18.21.38.242 0:0:0:0:0:ffff:1215:26f2
18.21.38.243 0:0:0:0:0:ffff:1215:26f3
18.21.38.244 0:0:0:0:0:ffff:1215:26f4
18.21.38.245 0:0:0:0:0:ffff:1215:26f5
18.21.38.246 0:0:0:0:0:ffff:1215:26f6
18.21.38.247 0:0:0:0:0:ffff:1215:26f7
18.21.38.248 0:0:0:0:0:ffff:1215:26f8
18.21.38.249 0:0:0:0:0:ffff:1215:26f9
18.21.38.250 0:0:0:0:0:ffff:1215:26fa
18.21.38.251 0:0:0:0:0:ffff:1215:26fb
18.21.38.252 0:0:0:0:0:ffff:1215:26fc
18.21.38.253 0:0:0:0:0:ffff:1215:26fd
18.21.38.254 0:0:0:0:0:ffff:1215:26fe
18.21.38.255 0:0:0:0:0:ffff:1215:26ff


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.