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
21.91.38.1 0:0:0:0:0:ffff:155b:2601
21.91.38.2 0:0:0:0:0:ffff:155b:2602
21.91.38.3 0:0:0:0:0:ffff:155b:2603
21.91.38.4 0:0:0:0:0:ffff:155b:2604
21.91.38.5 0:0:0:0:0:ffff:155b:2605
21.91.38.6 0:0:0:0:0:ffff:155b:2606
21.91.38.7 0:0:0:0:0:ffff:155b:2607
21.91.38.8 0:0:0:0:0:ffff:155b:2608
21.91.38.9 0:0:0:0:0:ffff:155b:2609
21.91.38.10 0:0:0:0:0:ffff:155b:260a
21.91.38.11 0:0:0:0:0:ffff:155b:260b
21.91.38.12 0:0:0:0:0:ffff:155b:260c
21.91.38.13 0:0:0:0:0:ffff:155b:260d
21.91.38.14 0:0:0:0:0:ffff:155b:260e
21.91.38.15 0:0:0:0:0:ffff:155b:260f
21.91.38.16 0:0:0:0:0:ffff:155b:2610
21.91.38.17 0:0:0:0:0:ffff:155b:2611
21.91.38.18 0:0:0:0:0:ffff:155b:2612
21.91.38.19 0:0:0:0:0:ffff:155b:2613
21.91.38.20 0:0:0:0:0:ffff:155b:2614
21.91.38.21 0:0:0:0:0:ffff:155b:2615
21.91.38.22 0:0:0:0:0:ffff:155b:2616
21.91.38.23 0:0:0:0:0:ffff:155b:2617
21.91.38.24 0:0:0:0:0:ffff:155b:2618
21.91.38.25 0:0:0:0:0:ffff:155b:2619
21.91.38.26 0:0:0:0:0:ffff:155b:261a
21.91.38.27 0:0:0:0:0:ffff:155b:261b
21.91.38.28 0:0:0:0:0:ffff:155b:261c
21.91.38.29 0:0:0:0:0:ffff:155b:261d
21.91.38.30 0:0:0:0:0:ffff:155b:261e
21.91.38.31 0:0:0:0:0:ffff:155b:261f
21.91.38.32 0:0:0:0:0:ffff:155b:2620
21.91.38.33 0:0:0:0:0:ffff:155b:2621
21.91.38.34 0:0:0:0:0:ffff:155b:2622
21.91.38.35 0:0:0:0:0:ffff:155b:2623
21.91.38.36 0:0:0:0:0:ffff:155b:2624
21.91.38.37 0:0:0:0:0:ffff:155b:2625
21.91.38.38 0:0:0:0:0:ffff:155b:2626
21.91.38.39 0:0:0:0:0:ffff:155b:2627
21.91.38.40 0:0:0:0:0:ffff:155b:2628
21.91.38.41 0:0:0:0:0:ffff:155b:2629
21.91.38.42 0:0:0:0:0:ffff:155b:262a
21.91.38.43 0:0:0:0:0:ffff:155b:262b
21.91.38.44 0:0:0:0:0:ffff:155b:262c
21.91.38.45 0:0:0:0:0:ffff:155b:262d
21.91.38.46 0:0:0:0:0:ffff:155b:262e
21.91.38.47 0:0:0:0:0:ffff:155b:262f
21.91.38.48 0:0:0:0:0:ffff:155b:2630
21.91.38.49 0:0:0:0:0:ffff:155b:2631
21.91.38.50 0:0:0:0:0:ffff:155b:2632
21.91.38.51 0:0:0:0:0:ffff:155b:2633
21.91.38.52 0:0:0:0:0:ffff:155b:2634
21.91.38.53 0:0:0:0:0:ffff:155b:2635
21.91.38.54 0:0:0:0:0:ffff:155b:2636
21.91.38.55 0:0:0:0:0:ffff:155b:2637
21.91.38.56 0:0:0:0:0:ffff:155b:2638
21.91.38.57 0:0:0:0:0:ffff:155b:2639
21.91.38.58 0:0:0:0:0:ffff:155b:263a
21.91.38.59 0:0:0:0:0:ffff:155b:263b
21.91.38.60 0:0:0:0:0:ffff:155b:263c


21.91.38.61 0:0:0:0:0:ffff:155b:263d
21.91.38.62 0:0:0:0:0:ffff:155b:263e
21.91.38.63 0:0:0:0:0:ffff:155b:263f
21.91.38.64 0:0:0:0:0:ffff:155b:2640
21.91.38.65 0:0:0:0:0:ffff:155b:2641
21.91.38.66 0:0:0:0:0:ffff:155b:2642
21.91.38.67 0:0:0:0:0:ffff:155b:2643
21.91.38.68 0:0:0:0:0:ffff:155b:2644
21.91.38.69 0:0:0:0:0:ffff:155b:2645
21.91.38.70 0:0:0:0:0:ffff:155b:2646
21.91.38.71 0:0:0:0:0:ffff:155b:2647
21.91.38.72 0:0:0:0:0:ffff:155b:2648
21.91.38.73 0:0:0:0:0:ffff:155b:2649
21.91.38.74 0:0:0:0:0:ffff:155b:264a
21.91.38.75 0:0:0:0:0:ffff:155b:264b
21.91.38.76 0:0:0:0:0:ffff:155b:264c
21.91.38.77 0:0:0:0:0:ffff:155b:264d
21.91.38.78 0:0:0:0:0:ffff:155b:264e
21.91.38.79 0:0:0:0:0:ffff:155b:264f
21.91.38.80 0:0:0:0:0:ffff:155b:2650
21.91.38.81 0:0:0:0:0:ffff:155b:2651
21.91.38.82 0:0:0:0:0:ffff:155b:2652
21.91.38.83 0:0:0:0:0:ffff:155b:2653
21.91.38.84 0:0:0:0:0:ffff:155b:2654
21.91.38.85 0:0:0:0:0:ffff:155b:2655
21.91.38.86 0:0:0:0:0:ffff:155b:2656
21.91.38.87 0:0:0:0:0:ffff:155b:2657
21.91.38.88 0:0:0:0:0:ffff:155b:2658
21.91.38.89 0:0:0:0:0:ffff:155b:2659
21.91.38.90 0:0:0:0:0:ffff:155b:265a
21.91.38.91 0:0:0:0:0:ffff:155b:265b
21.91.38.92 0:0:0:0:0:ffff:155b:265c
21.91.38.93 0:0:0:0:0:ffff:155b:265d
21.91.38.94 0:0:0:0:0:ffff:155b:265e
21.91.38.95 0:0:0:0:0:ffff:155b:265f
21.91.38.96 0:0:0:0:0:ffff:155b:2660
21.91.38.97 0:0:0:0:0:ffff:155b:2661
21.91.38.98 0:0:0:0:0:ffff:155b:2662
21.91.38.99 0:0:0:0:0:ffff:155b:2663
21.91.38.100 0:0:0:0:0:ffff:155b:2664
21.91.38.101 0:0:0:0:0:ffff:155b:2665
21.91.38.102 0:0:0:0:0:ffff:155b:2666
21.91.38.103 0:0:0:0:0:ffff:155b:2667
21.91.38.104 0:0:0:0:0:ffff:155b:2668
21.91.38.105 0:0:0:0:0:ffff:155b:2669
21.91.38.106 0:0:0:0:0:ffff:155b:266a
21.91.38.107 0:0:0:0:0:ffff:155b:266b
21.91.38.108 0:0:0:0:0:ffff:155b:266c
21.91.38.109 0:0:0:0:0:ffff:155b:266d
21.91.38.110 0:0:0:0:0:ffff:155b:266e
21.91.38.111 0:0:0:0:0:ffff:155b:266f
21.91.38.112 0:0:0:0:0:ffff:155b:2670
21.91.38.113 0:0:0:0:0:ffff:155b:2671
21.91.38.114 0:0:0:0:0:ffff:155b:2672
21.91.38.115 0:0:0:0:0:ffff:155b:2673
21.91.38.116 0:0:0:0:0:ffff:155b:2674
21.91.38.117 0:0:0:0:0:ffff:155b:2675
21.91.38.118 0:0:0:0:0:ffff:155b:2676
21.91.38.119 0:0:0:0:0:ffff:155b:2677
21.91.38.120 0:0:0:0:0:ffff:155b:2678


21.91.38.121 0:0:0:0:0:ffff:155b:2679
21.91.38.122 0:0:0:0:0:ffff:155b:267a
21.91.38.123 0:0:0:0:0:ffff:155b:267b
21.91.38.124 0:0:0:0:0:ffff:155b:267c
21.91.38.125 0:0:0:0:0:ffff:155b:267d
21.91.38.126 0:0:0:0:0:ffff:155b:267e
21.91.38.127 0:0:0:0:0:ffff:155b:267f
21.91.38.128 0:0:0:0:0:ffff:155b:2680
21.91.38.129 0:0:0:0:0:ffff:155b:2681
21.91.38.130 0:0:0:0:0:ffff:155b:2682
21.91.38.131 0:0:0:0:0:ffff:155b:2683
21.91.38.132 0:0:0:0:0:ffff:155b:2684
21.91.38.133 0:0:0:0:0:ffff:155b:2685
21.91.38.134 0:0:0:0:0:ffff:155b:2686
21.91.38.135 0:0:0:0:0:ffff:155b:2687
21.91.38.136 0:0:0:0:0:ffff:155b:2688
21.91.38.137 0:0:0:0:0:ffff:155b:2689
21.91.38.138 0:0:0:0:0:ffff:155b:268a
21.91.38.139 0:0:0:0:0:ffff:155b:268b
21.91.38.140 0:0:0:0:0:ffff:155b:268c
21.91.38.141 0:0:0:0:0:ffff:155b:268d
21.91.38.142 0:0:0:0:0:ffff:155b:268e
21.91.38.143 0:0:0:0:0:ffff:155b:268f
21.91.38.144 0:0:0:0:0:ffff:155b:2690
21.91.38.145 0:0:0:0:0:ffff:155b:2691
21.91.38.146 0:0:0:0:0:ffff:155b:2692
21.91.38.147 0:0:0:0:0:ffff:155b:2693
21.91.38.148 0:0:0:0:0:ffff:155b:2694
21.91.38.149 0:0:0:0:0:ffff:155b:2695
21.91.38.150 0:0:0:0:0:ffff:155b:2696
21.91.38.151 0:0:0:0:0:ffff:155b:2697
21.91.38.152 0:0:0:0:0:ffff:155b:2698
21.91.38.153 0:0:0:0:0:ffff:155b:2699
21.91.38.154 0:0:0:0:0:ffff:155b:269a
21.91.38.155 0:0:0:0:0:ffff:155b:269b
21.91.38.156 0:0:0:0:0:ffff:155b:269c
21.91.38.157 0:0:0:0:0:ffff:155b:269d
21.91.38.158 0:0:0:0:0:ffff:155b:269e
21.91.38.159 0:0:0:0:0:ffff:155b:269f
21.91.38.160 0:0:0:0:0:ffff:155b:26a0
21.91.38.161 0:0:0:0:0:ffff:155b:26a1
21.91.38.162 0:0:0:0:0:ffff:155b:26a2
21.91.38.163 0:0:0:0:0:ffff:155b:26a3
21.91.38.164 0:0:0:0:0:ffff:155b:26a4
21.91.38.165 0:0:0:0:0:ffff:155b:26a5
21.91.38.166 0:0:0:0:0:ffff:155b:26a6
21.91.38.167 0:0:0:0:0:ffff:155b:26a7
21.91.38.168 0:0:0:0:0:ffff:155b:26a8
21.91.38.169 0:0:0:0:0:ffff:155b:26a9
21.91.38.170 0:0:0:0:0:ffff:155b:26aa
21.91.38.171 0:0:0:0:0:ffff:155b:26ab
21.91.38.172 0:0:0:0:0:ffff:155b:26ac
21.91.38.173 0:0:0:0:0:ffff:155b:26ad
21.91.38.174 0:0:0:0:0:ffff:155b:26ae
21.91.38.175 0:0:0:0:0:ffff:155b:26af
21.91.38.176 0:0:0:0:0:ffff:155b:26b0
21.91.38.177 0:0:0:0:0:ffff:155b:26b1
21.91.38.178 0:0:0:0:0:ffff:155b:26b2
21.91.38.179 0:0:0:0:0:ffff:155b:26b3
21.91.38.180 0:0:0:0:0:ffff:155b:26b4


21.91.38.181 0:0:0:0:0:ffff:155b:26b5
21.91.38.182 0:0:0:0:0:ffff:155b:26b6
21.91.38.183 0:0:0:0:0:ffff:155b:26b7
21.91.38.184 0:0:0:0:0:ffff:155b:26b8
21.91.38.185 0:0:0:0:0:ffff:155b:26b9
21.91.38.186 0:0:0:0:0:ffff:155b:26ba
21.91.38.187 0:0:0:0:0:ffff:155b:26bb
21.91.38.188 0:0:0:0:0:ffff:155b:26bc
21.91.38.189 0:0:0:0:0:ffff:155b:26bd
21.91.38.190 0:0:0:0:0:ffff:155b:26be
21.91.38.191 0:0:0:0:0:ffff:155b:26bf
21.91.38.192 0:0:0:0:0:ffff:155b:26c0
21.91.38.193 0:0:0:0:0:ffff:155b:26c1
21.91.38.194 0:0:0:0:0:ffff:155b:26c2
21.91.38.195 0:0:0:0:0:ffff:155b:26c3
21.91.38.196 0:0:0:0:0:ffff:155b:26c4
21.91.38.197 0:0:0:0:0:ffff:155b:26c5
21.91.38.198 0:0:0:0:0:ffff:155b:26c6
21.91.38.199 0:0:0:0:0:ffff:155b:26c7
21.91.38.200 0:0:0:0:0:ffff:155b:26c8
21.91.38.201 0:0:0:0:0:ffff:155b:26c9
21.91.38.202 0:0:0:0:0:ffff:155b:26ca
21.91.38.203 0:0:0:0:0:ffff:155b:26cb
21.91.38.204 0:0:0:0:0:ffff:155b:26cc
21.91.38.205 0:0:0:0:0:ffff:155b:26cd
21.91.38.206 0:0:0:0:0:ffff:155b:26ce
21.91.38.207 0:0:0:0:0:ffff:155b:26cf
21.91.38.208 0:0:0:0:0:ffff:155b:26d0
21.91.38.209 0:0:0:0:0:ffff:155b:26d1
21.91.38.210 0:0:0:0:0:ffff:155b:26d2
21.91.38.211 0:0:0:0:0:ffff:155b:26d3
21.91.38.212 0:0:0:0:0:ffff:155b:26d4
21.91.38.213 0:0:0:0:0:ffff:155b:26d5
21.91.38.214 0:0:0:0:0:ffff:155b:26d6
21.91.38.215 0:0:0:0:0:ffff:155b:26d7
21.91.38.216 0:0:0:0:0:ffff:155b:26d8
21.91.38.217 0:0:0:0:0:ffff:155b:26d9
21.91.38.218 0:0:0:0:0:ffff:155b:26da
21.91.38.219 0:0:0:0:0:ffff:155b:26db
21.91.38.220 0:0:0:0:0:ffff:155b:26dc
21.91.38.221 0:0:0:0:0:ffff:155b:26dd
21.91.38.222 0:0:0:0:0:ffff:155b:26de
21.91.38.223 0:0:0:0:0:ffff:155b:26df
21.91.38.224 0:0:0:0:0:ffff:155b:26e0
21.91.38.225 0:0:0:0:0:ffff:155b:26e1
21.91.38.226 0:0:0:0:0:ffff:155b:26e2
21.91.38.227 0:0:0:0:0:ffff:155b:26e3
21.91.38.228 0:0:0:0:0:ffff:155b:26e4
21.91.38.229 0:0:0:0:0:ffff:155b:26e5
21.91.38.230 0:0:0:0:0:ffff:155b:26e6
21.91.38.231 0:0:0:0:0:ffff:155b:26e7
21.91.38.232 0:0:0:0:0:ffff:155b:26e8
21.91.38.233 0:0:0:0:0:ffff:155b:26e9
21.91.38.234 0:0:0:0:0:ffff:155b:26ea
21.91.38.235 0:0:0:0:0:ffff:155b:26eb
21.91.38.236 0:0:0:0:0:ffff:155b:26ec
21.91.38.237 0:0:0:0:0:ffff:155b:26ed
21.91.38.238 0:0:0:0:0:ffff:155b:26ee
21.91.38.239 0:0:0:0:0:ffff:155b:26ef
21.91.38.240 0:0:0:0:0:ffff:155b:26f0
21.91.38.241 0:0:0:0:0:ffff:155b:26f1
21.91.38.242 0:0:0:0:0:ffff:155b:26f2
21.91.38.243 0:0:0:0:0:ffff:155b:26f3
21.91.38.244 0:0:0:0:0:ffff:155b:26f4
21.91.38.245 0:0:0:0:0:ffff:155b:26f5
21.91.38.246 0:0:0:0:0:ffff:155b:26f6
21.91.38.247 0:0:0:0:0:ffff:155b:26f7
21.91.38.248 0:0:0:0:0:ffff:155b:26f8
21.91.38.249 0:0:0:0:0:ffff:155b:26f9
21.91.38.250 0:0:0:0:0:ffff:155b:26fa
21.91.38.251 0:0:0:0:0:ffff:155b:26fb
21.91.38.252 0:0:0:0:0:ffff:155b:26fc
21.91.38.253 0:0:0:0:0:ffff:155b:26fd
21.91.38.254 0:0:0:0:0:ffff:155b:26fe
21.91.38.255 0:0:0:0:0:ffff:155b: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.