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
21.15.105.1 0:0:0:0:0:ffff:150f:6901
21.15.105.2 0:0:0:0:0:ffff:150f:6902
21.15.105.3 0:0:0:0:0:ffff:150f:6903
21.15.105.4 0:0:0:0:0:ffff:150f:6904
21.15.105.5 0:0:0:0:0:ffff:150f:6905
21.15.105.6 0:0:0:0:0:ffff:150f:6906
21.15.105.7 0:0:0:0:0:ffff:150f:6907
21.15.105.8 0:0:0:0:0:ffff:150f:6908
21.15.105.9 0:0:0:0:0:ffff:150f:6909
21.15.105.10 0:0:0:0:0:ffff:150f:690a
21.15.105.11 0:0:0:0:0:ffff:150f:690b
21.15.105.12 0:0:0:0:0:ffff:150f:690c
21.15.105.13 0:0:0:0:0:ffff:150f:690d
21.15.105.14 0:0:0:0:0:ffff:150f:690e
21.15.105.15 0:0:0:0:0:ffff:150f:690f
21.15.105.16 0:0:0:0:0:ffff:150f:6910
21.15.105.17 0:0:0:0:0:ffff:150f:6911
21.15.105.18 0:0:0:0:0:ffff:150f:6912
21.15.105.19 0:0:0:0:0:ffff:150f:6913
21.15.105.20 0:0:0:0:0:ffff:150f:6914
21.15.105.21 0:0:0:0:0:ffff:150f:6915
21.15.105.22 0:0:0:0:0:ffff:150f:6916
21.15.105.23 0:0:0:0:0:ffff:150f:6917
21.15.105.24 0:0:0:0:0:ffff:150f:6918
21.15.105.25 0:0:0:0:0:ffff:150f:6919
21.15.105.26 0:0:0:0:0:ffff:150f:691a
21.15.105.27 0:0:0:0:0:ffff:150f:691b
21.15.105.28 0:0:0:0:0:ffff:150f:691c
21.15.105.29 0:0:0:0:0:ffff:150f:691d
21.15.105.30 0:0:0:0:0:ffff:150f:691e
21.15.105.31 0:0:0:0:0:ffff:150f:691f
21.15.105.32 0:0:0:0:0:ffff:150f:6920
21.15.105.33 0:0:0:0:0:ffff:150f:6921
21.15.105.34 0:0:0:0:0:ffff:150f:6922
21.15.105.35 0:0:0:0:0:ffff:150f:6923
21.15.105.36 0:0:0:0:0:ffff:150f:6924
21.15.105.37 0:0:0:0:0:ffff:150f:6925
21.15.105.38 0:0:0:0:0:ffff:150f:6926
21.15.105.39 0:0:0:0:0:ffff:150f:6927
21.15.105.40 0:0:0:0:0:ffff:150f:6928
21.15.105.41 0:0:0:0:0:ffff:150f:6929
21.15.105.42 0:0:0:0:0:ffff:150f:692a
21.15.105.43 0:0:0:0:0:ffff:150f:692b
21.15.105.44 0:0:0:0:0:ffff:150f:692c
21.15.105.45 0:0:0:0:0:ffff:150f:692d
21.15.105.46 0:0:0:0:0:ffff:150f:692e
21.15.105.47 0:0:0:0:0:ffff:150f:692f
21.15.105.48 0:0:0:0:0:ffff:150f:6930
21.15.105.49 0:0:0:0:0:ffff:150f:6931
21.15.105.50 0:0:0:0:0:ffff:150f:6932
21.15.105.51 0:0:0:0:0:ffff:150f:6933
21.15.105.52 0:0:0:0:0:ffff:150f:6934
21.15.105.53 0:0:0:0:0:ffff:150f:6935
21.15.105.54 0:0:0:0:0:ffff:150f:6936
21.15.105.55 0:0:0:0:0:ffff:150f:6937
21.15.105.56 0:0:0:0:0:ffff:150f:6938
21.15.105.57 0:0:0:0:0:ffff:150f:6939
21.15.105.58 0:0:0:0:0:ffff:150f:693a
21.15.105.59 0:0:0:0:0:ffff:150f:693b
21.15.105.60 0:0:0:0:0:ffff:150f:693c


21.15.105.61 0:0:0:0:0:ffff:150f:693d
21.15.105.62 0:0:0:0:0:ffff:150f:693e
21.15.105.63 0:0:0:0:0:ffff:150f:693f
21.15.105.64 0:0:0:0:0:ffff:150f:6940
21.15.105.65 0:0:0:0:0:ffff:150f:6941
21.15.105.66 0:0:0:0:0:ffff:150f:6942
21.15.105.67 0:0:0:0:0:ffff:150f:6943
21.15.105.68 0:0:0:0:0:ffff:150f:6944
21.15.105.69 0:0:0:0:0:ffff:150f:6945
21.15.105.70 0:0:0:0:0:ffff:150f:6946
21.15.105.71 0:0:0:0:0:ffff:150f:6947
21.15.105.72 0:0:0:0:0:ffff:150f:6948
21.15.105.73 0:0:0:0:0:ffff:150f:6949
21.15.105.74 0:0:0:0:0:ffff:150f:694a
21.15.105.75 0:0:0:0:0:ffff:150f:694b
21.15.105.76 0:0:0:0:0:ffff:150f:694c
21.15.105.77 0:0:0:0:0:ffff:150f:694d
21.15.105.78 0:0:0:0:0:ffff:150f:694e
21.15.105.79 0:0:0:0:0:ffff:150f:694f
21.15.105.80 0:0:0:0:0:ffff:150f:6950
21.15.105.81 0:0:0:0:0:ffff:150f:6951
21.15.105.82 0:0:0:0:0:ffff:150f:6952
21.15.105.83 0:0:0:0:0:ffff:150f:6953
21.15.105.84 0:0:0:0:0:ffff:150f:6954
21.15.105.85 0:0:0:0:0:ffff:150f:6955
21.15.105.86 0:0:0:0:0:ffff:150f:6956
21.15.105.87 0:0:0:0:0:ffff:150f:6957
21.15.105.88 0:0:0:0:0:ffff:150f:6958
21.15.105.89 0:0:0:0:0:ffff:150f:6959
21.15.105.90 0:0:0:0:0:ffff:150f:695a
21.15.105.91 0:0:0:0:0:ffff:150f:695b
21.15.105.92 0:0:0:0:0:ffff:150f:695c
21.15.105.93 0:0:0:0:0:ffff:150f:695d
21.15.105.94 0:0:0:0:0:ffff:150f:695e
21.15.105.95 0:0:0:0:0:ffff:150f:695f
21.15.105.96 0:0:0:0:0:ffff:150f:6960
21.15.105.97 0:0:0:0:0:ffff:150f:6961
21.15.105.98 0:0:0:0:0:ffff:150f:6962
21.15.105.99 0:0:0:0:0:ffff:150f:6963
21.15.105.100 0:0:0:0:0:ffff:150f:6964
21.15.105.101 0:0:0:0:0:ffff:150f:6965
21.15.105.102 0:0:0:0:0:ffff:150f:6966
21.15.105.103 0:0:0:0:0:ffff:150f:6967
21.15.105.104 0:0:0:0:0:ffff:150f:6968
21.15.105.105 0:0:0:0:0:ffff:150f:6969
21.15.105.106 0:0:0:0:0:ffff:150f:696a
21.15.105.107 0:0:0:0:0:ffff:150f:696b
21.15.105.108 0:0:0:0:0:ffff:150f:696c
21.15.105.109 0:0:0:0:0:ffff:150f:696d
21.15.105.110 0:0:0:0:0:ffff:150f:696e
21.15.105.111 0:0:0:0:0:ffff:150f:696f
21.15.105.112 0:0:0:0:0:ffff:150f:6970
21.15.105.113 0:0:0:0:0:ffff:150f:6971
21.15.105.114 0:0:0:0:0:ffff:150f:6972
21.15.105.115 0:0:0:0:0:ffff:150f:6973
21.15.105.116 0:0:0:0:0:ffff:150f:6974
21.15.105.117 0:0:0:0:0:ffff:150f:6975
21.15.105.118 0:0:0:0:0:ffff:150f:6976
21.15.105.119 0:0:0:0:0:ffff:150f:6977
21.15.105.120 0:0:0:0:0:ffff:150f:6978


21.15.105.121 0:0:0:0:0:ffff:150f:6979
21.15.105.122 0:0:0:0:0:ffff:150f:697a
21.15.105.123 0:0:0:0:0:ffff:150f:697b
21.15.105.124 0:0:0:0:0:ffff:150f:697c
21.15.105.125 0:0:0:0:0:ffff:150f:697d
21.15.105.126 0:0:0:0:0:ffff:150f:697e
21.15.105.127 0:0:0:0:0:ffff:150f:697f
21.15.105.128 0:0:0:0:0:ffff:150f:6980
21.15.105.129 0:0:0:0:0:ffff:150f:6981
21.15.105.130 0:0:0:0:0:ffff:150f:6982
21.15.105.131 0:0:0:0:0:ffff:150f:6983
21.15.105.132 0:0:0:0:0:ffff:150f:6984
21.15.105.133 0:0:0:0:0:ffff:150f:6985
21.15.105.134 0:0:0:0:0:ffff:150f:6986
21.15.105.135 0:0:0:0:0:ffff:150f:6987
21.15.105.136 0:0:0:0:0:ffff:150f:6988
21.15.105.137 0:0:0:0:0:ffff:150f:6989
21.15.105.138 0:0:0:0:0:ffff:150f:698a
21.15.105.139 0:0:0:0:0:ffff:150f:698b
21.15.105.140 0:0:0:0:0:ffff:150f:698c
21.15.105.141 0:0:0:0:0:ffff:150f:698d
21.15.105.142 0:0:0:0:0:ffff:150f:698e
21.15.105.143 0:0:0:0:0:ffff:150f:698f
21.15.105.144 0:0:0:0:0:ffff:150f:6990
21.15.105.145 0:0:0:0:0:ffff:150f:6991
21.15.105.146 0:0:0:0:0:ffff:150f:6992
21.15.105.147 0:0:0:0:0:ffff:150f:6993
21.15.105.148 0:0:0:0:0:ffff:150f:6994
21.15.105.149 0:0:0:0:0:ffff:150f:6995
21.15.105.150 0:0:0:0:0:ffff:150f:6996
21.15.105.151 0:0:0:0:0:ffff:150f:6997
21.15.105.152 0:0:0:0:0:ffff:150f:6998
21.15.105.153 0:0:0:0:0:ffff:150f:6999
21.15.105.154 0:0:0:0:0:ffff:150f:699a
21.15.105.155 0:0:0:0:0:ffff:150f:699b
21.15.105.156 0:0:0:0:0:ffff:150f:699c
21.15.105.157 0:0:0:0:0:ffff:150f:699d
21.15.105.158 0:0:0:0:0:ffff:150f:699e
21.15.105.159 0:0:0:0:0:ffff:150f:699f
21.15.105.160 0:0:0:0:0:ffff:150f:69a0
21.15.105.161 0:0:0:0:0:ffff:150f:69a1
21.15.105.162 0:0:0:0:0:ffff:150f:69a2
21.15.105.163 0:0:0:0:0:ffff:150f:69a3
21.15.105.164 0:0:0:0:0:ffff:150f:69a4
21.15.105.165 0:0:0:0:0:ffff:150f:69a5
21.15.105.166 0:0:0:0:0:ffff:150f:69a6
21.15.105.167 0:0:0:0:0:ffff:150f:69a7
21.15.105.168 0:0:0:0:0:ffff:150f:69a8
21.15.105.169 0:0:0:0:0:ffff:150f:69a9
21.15.105.170 0:0:0:0:0:ffff:150f:69aa
21.15.105.171 0:0:0:0:0:ffff:150f:69ab
21.15.105.172 0:0:0:0:0:ffff:150f:69ac
21.15.105.173 0:0:0:0:0:ffff:150f:69ad
21.15.105.174 0:0:0:0:0:ffff:150f:69ae
21.15.105.175 0:0:0:0:0:ffff:150f:69af
21.15.105.176 0:0:0:0:0:ffff:150f:69b0
21.15.105.177 0:0:0:0:0:ffff:150f:69b1
21.15.105.178 0:0:0:0:0:ffff:150f:69b2
21.15.105.179 0:0:0:0:0:ffff:150f:69b3
21.15.105.180 0:0:0:0:0:ffff:150f:69b4


21.15.105.181 0:0:0:0:0:ffff:150f:69b5
21.15.105.182 0:0:0:0:0:ffff:150f:69b6
21.15.105.183 0:0:0:0:0:ffff:150f:69b7
21.15.105.184 0:0:0:0:0:ffff:150f:69b8
21.15.105.185 0:0:0:0:0:ffff:150f:69b9
21.15.105.186 0:0:0:0:0:ffff:150f:69ba
21.15.105.187 0:0:0:0:0:ffff:150f:69bb
21.15.105.188 0:0:0:0:0:ffff:150f:69bc
21.15.105.189 0:0:0:0:0:ffff:150f:69bd
21.15.105.190 0:0:0:0:0:ffff:150f:69be
21.15.105.191 0:0:0:0:0:ffff:150f:69bf
21.15.105.192 0:0:0:0:0:ffff:150f:69c0
21.15.105.193 0:0:0:0:0:ffff:150f:69c1
21.15.105.194 0:0:0:0:0:ffff:150f:69c2
21.15.105.195 0:0:0:0:0:ffff:150f:69c3
21.15.105.196 0:0:0:0:0:ffff:150f:69c4
21.15.105.197 0:0:0:0:0:ffff:150f:69c5
21.15.105.198 0:0:0:0:0:ffff:150f:69c6
21.15.105.199 0:0:0:0:0:ffff:150f:69c7
21.15.105.200 0:0:0:0:0:ffff:150f:69c8
21.15.105.201 0:0:0:0:0:ffff:150f:69c9
21.15.105.202 0:0:0:0:0:ffff:150f:69ca
21.15.105.203 0:0:0:0:0:ffff:150f:69cb
21.15.105.204 0:0:0:0:0:ffff:150f:69cc
21.15.105.205 0:0:0:0:0:ffff:150f:69cd
21.15.105.206 0:0:0:0:0:ffff:150f:69ce
21.15.105.207 0:0:0:0:0:ffff:150f:69cf
21.15.105.208 0:0:0:0:0:ffff:150f:69d0
21.15.105.209 0:0:0:0:0:ffff:150f:69d1
21.15.105.210 0:0:0:0:0:ffff:150f:69d2
21.15.105.211 0:0:0:0:0:ffff:150f:69d3
21.15.105.212 0:0:0:0:0:ffff:150f:69d4
21.15.105.213 0:0:0:0:0:ffff:150f:69d5
21.15.105.214 0:0:0:0:0:ffff:150f:69d6
21.15.105.215 0:0:0:0:0:ffff:150f:69d7
21.15.105.216 0:0:0:0:0:ffff:150f:69d8
21.15.105.217 0:0:0:0:0:ffff:150f:69d9
21.15.105.218 0:0:0:0:0:ffff:150f:69da
21.15.105.219 0:0:0:0:0:ffff:150f:69db
21.15.105.220 0:0:0:0:0:ffff:150f:69dc
21.15.105.221 0:0:0:0:0:ffff:150f:69dd
21.15.105.222 0:0:0:0:0:ffff:150f:69de
21.15.105.223 0:0:0:0:0:ffff:150f:69df
21.15.105.224 0:0:0:0:0:ffff:150f:69e0
21.15.105.225 0:0:0:0:0:ffff:150f:69e1
21.15.105.226 0:0:0:0:0:ffff:150f:69e2
21.15.105.227 0:0:0:0:0:ffff:150f:69e3
21.15.105.228 0:0:0:0:0:ffff:150f:69e4
21.15.105.229 0:0:0:0:0:ffff:150f:69e5
21.15.105.230 0:0:0:0:0:ffff:150f:69e6
21.15.105.231 0:0:0:0:0:ffff:150f:69e7
21.15.105.232 0:0:0:0:0:ffff:150f:69e8
21.15.105.233 0:0:0:0:0:ffff:150f:69e9
21.15.105.234 0:0:0:0:0:ffff:150f:69ea
21.15.105.235 0:0:0:0:0:ffff:150f:69eb
21.15.105.236 0:0:0:0:0:ffff:150f:69ec
21.15.105.237 0:0:0:0:0:ffff:150f:69ed
21.15.105.238 0:0:0:0:0:ffff:150f:69ee
21.15.105.239 0:0:0:0:0:ffff:150f:69ef
21.15.105.240 0:0:0:0:0:ffff:150f:69f0
21.15.105.241 0:0:0:0:0:ffff:150f:69f1
21.15.105.242 0:0:0:0:0:ffff:150f:69f2
21.15.105.243 0:0:0:0:0:ffff:150f:69f3
21.15.105.244 0:0:0:0:0:ffff:150f:69f4
21.15.105.245 0:0:0:0:0:ffff:150f:69f5
21.15.105.246 0:0:0:0:0:ffff:150f:69f6
21.15.105.247 0:0:0:0:0:ffff:150f:69f7
21.15.105.248 0:0:0:0:0:ffff:150f:69f8
21.15.105.249 0:0:0:0:0:ffff:150f:69f9
21.15.105.250 0:0:0:0:0:ffff:150f:69fa
21.15.105.251 0:0:0:0:0:ffff:150f:69fb
21.15.105.252 0:0:0:0:0:ffff:150f:69fc
21.15.105.253 0:0:0:0:0:ffff:150f:69fd
21.15.105.254 0:0:0:0:0:ffff:150f:69fe
21.15.105.255 0:0:0:0:0:ffff:150f:69ff


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.