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
123.255.18.1 0:0:0:0:0:ffff:7bff:1201
123.255.18.2 0:0:0:0:0:ffff:7bff:1202
123.255.18.3 0:0:0:0:0:ffff:7bff:1203
123.255.18.4 0:0:0:0:0:ffff:7bff:1204
123.255.18.5 0:0:0:0:0:ffff:7bff:1205
123.255.18.6 0:0:0:0:0:ffff:7bff:1206
123.255.18.7 0:0:0:0:0:ffff:7bff:1207
123.255.18.8 0:0:0:0:0:ffff:7bff:1208
123.255.18.9 0:0:0:0:0:ffff:7bff:1209
123.255.18.10 0:0:0:0:0:ffff:7bff:120a
123.255.18.11 0:0:0:0:0:ffff:7bff:120b
123.255.18.12 0:0:0:0:0:ffff:7bff:120c
123.255.18.13 0:0:0:0:0:ffff:7bff:120d
123.255.18.14 0:0:0:0:0:ffff:7bff:120e
123.255.18.15 0:0:0:0:0:ffff:7bff:120f
123.255.18.16 0:0:0:0:0:ffff:7bff:1210
123.255.18.17 0:0:0:0:0:ffff:7bff:1211
123.255.18.18 0:0:0:0:0:ffff:7bff:1212
123.255.18.19 0:0:0:0:0:ffff:7bff:1213
123.255.18.20 0:0:0:0:0:ffff:7bff:1214
123.255.18.21 0:0:0:0:0:ffff:7bff:1215
123.255.18.22 0:0:0:0:0:ffff:7bff:1216
123.255.18.23 0:0:0:0:0:ffff:7bff:1217
123.255.18.24 0:0:0:0:0:ffff:7bff:1218
123.255.18.25 0:0:0:0:0:ffff:7bff:1219
123.255.18.26 0:0:0:0:0:ffff:7bff:121a
123.255.18.27 0:0:0:0:0:ffff:7bff:121b
123.255.18.28 0:0:0:0:0:ffff:7bff:121c
123.255.18.29 0:0:0:0:0:ffff:7bff:121d
123.255.18.30 0:0:0:0:0:ffff:7bff:121e
123.255.18.31 0:0:0:0:0:ffff:7bff:121f
123.255.18.32 0:0:0:0:0:ffff:7bff:1220
123.255.18.33 0:0:0:0:0:ffff:7bff:1221
123.255.18.34 0:0:0:0:0:ffff:7bff:1222
123.255.18.35 0:0:0:0:0:ffff:7bff:1223
123.255.18.36 0:0:0:0:0:ffff:7bff:1224
123.255.18.37 0:0:0:0:0:ffff:7bff:1225
123.255.18.38 0:0:0:0:0:ffff:7bff:1226
123.255.18.39 0:0:0:0:0:ffff:7bff:1227
123.255.18.40 0:0:0:0:0:ffff:7bff:1228
123.255.18.41 0:0:0:0:0:ffff:7bff:1229
123.255.18.42 0:0:0:0:0:ffff:7bff:122a
123.255.18.43 0:0:0:0:0:ffff:7bff:122b
123.255.18.44 0:0:0:0:0:ffff:7bff:122c
123.255.18.45 0:0:0:0:0:ffff:7bff:122d
123.255.18.46 0:0:0:0:0:ffff:7bff:122e
123.255.18.47 0:0:0:0:0:ffff:7bff:122f
123.255.18.48 0:0:0:0:0:ffff:7bff:1230
123.255.18.49 0:0:0:0:0:ffff:7bff:1231
123.255.18.50 0:0:0:0:0:ffff:7bff:1232
123.255.18.51 0:0:0:0:0:ffff:7bff:1233
123.255.18.52 0:0:0:0:0:ffff:7bff:1234
123.255.18.53 0:0:0:0:0:ffff:7bff:1235
123.255.18.54 0:0:0:0:0:ffff:7bff:1236
123.255.18.55 0:0:0:0:0:ffff:7bff:1237
123.255.18.56 0:0:0:0:0:ffff:7bff:1238
123.255.18.57 0:0:0:0:0:ffff:7bff:1239
123.255.18.58 0:0:0:0:0:ffff:7bff:123a
123.255.18.59 0:0:0:0:0:ffff:7bff:123b
123.255.18.60 0:0:0:0:0:ffff:7bff:123c


123.255.18.61 0:0:0:0:0:ffff:7bff:123d
123.255.18.62 0:0:0:0:0:ffff:7bff:123e
123.255.18.63 0:0:0:0:0:ffff:7bff:123f
123.255.18.64 0:0:0:0:0:ffff:7bff:1240
123.255.18.65 0:0:0:0:0:ffff:7bff:1241
123.255.18.66 0:0:0:0:0:ffff:7bff:1242
123.255.18.67 0:0:0:0:0:ffff:7bff:1243
123.255.18.68 0:0:0:0:0:ffff:7bff:1244
123.255.18.69 0:0:0:0:0:ffff:7bff:1245
123.255.18.70 0:0:0:0:0:ffff:7bff:1246
123.255.18.71 0:0:0:0:0:ffff:7bff:1247
123.255.18.72 0:0:0:0:0:ffff:7bff:1248
123.255.18.73 0:0:0:0:0:ffff:7bff:1249
123.255.18.74 0:0:0:0:0:ffff:7bff:124a
123.255.18.75 0:0:0:0:0:ffff:7bff:124b
123.255.18.76 0:0:0:0:0:ffff:7bff:124c
123.255.18.77 0:0:0:0:0:ffff:7bff:124d
123.255.18.78 0:0:0:0:0:ffff:7bff:124e
123.255.18.79 0:0:0:0:0:ffff:7bff:124f
123.255.18.80 0:0:0:0:0:ffff:7bff:1250
123.255.18.81 0:0:0:0:0:ffff:7bff:1251
123.255.18.82 0:0:0:0:0:ffff:7bff:1252
123.255.18.83 0:0:0:0:0:ffff:7bff:1253
123.255.18.84 0:0:0:0:0:ffff:7bff:1254
123.255.18.85 0:0:0:0:0:ffff:7bff:1255
123.255.18.86 0:0:0:0:0:ffff:7bff:1256
123.255.18.87 0:0:0:0:0:ffff:7bff:1257
123.255.18.88 0:0:0:0:0:ffff:7bff:1258
123.255.18.89 0:0:0:0:0:ffff:7bff:1259
123.255.18.90 0:0:0:0:0:ffff:7bff:125a
123.255.18.91 0:0:0:0:0:ffff:7bff:125b
123.255.18.92 0:0:0:0:0:ffff:7bff:125c
123.255.18.93 0:0:0:0:0:ffff:7bff:125d
123.255.18.94 0:0:0:0:0:ffff:7bff:125e
123.255.18.95 0:0:0:0:0:ffff:7bff:125f
123.255.18.96 0:0:0:0:0:ffff:7bff:1260
123.255.18.97 0:0:0:0:0:ffff:7bff:1261
123.255.18.98 0:0:0:0:0:ffff:7bff:1262
123.255.18.99 0:0:0:0:0:ffff:7bff:1263
123.255.18.100 0:0:0:0:0:ffff:7bff:1264
123.255.18.101 0:0:0:0:0:ffff:7bff:1265
123.255.18.102 0:0:0:0:0:ffff:7bff:1266
123.255.18.103 0:0:0:0:0:ffff:7bff:1267
123.255.18.104 0:0:0:0:0:ffff:7bff:1268
123.255.18.105 0:0:0:0:0:ffff:7bff:1269
123.255.18.106 0:0:0:0:0:ffff:7bff:126a
123.255.18.107 0:0:0:0:0:ffff:7bff:126b
123.255.18.108 0:0:0:0:0:ffff:7bff:126c
123.255.18.109 0:0:0:0:0:ffff:7bff:126d
123.255.18.110 0:0:0:0:0:ffff:7bff:126e
123.255.18.111 0:0:0:0:0:ffff:7bff:126f
123.255.18.112 0:0:0:0:0:ffff:7bff:1270
123.255.18.113 0:0:0:0:0:ffff:7bff:1271
123.255.18.114 0:0:0:0:0:ffff:7bff:1272
123.255.18.115 0:0:0:0:0:ffff:7bff:1273
123.255.18.116 0:0:0:0:0:ffff:7bff:1274
123.255.18.117 0:0:0:0:0:ffff:7bff:1275
123.255.18.118 0:0:0:0:0:ffff:7bff:1276
123.255.18.119 0:0:0:0:0:ffff:7bff:1277
123.255.18.120 0:0:0:0:0:ffff:7bff:1278


123.255.18.121 0:0:0:0:0:ffff:7bff:1279
123.255.18.122 0:0:0:0:0:ffff:7bff:127a
123.255.18.123 0:0:0:0:0:ffff:7bff:127b
123.255.18.124 0:0:0:0:0:ffff:7bff:127c
123.255.18.125 0:0:0:0:0:ffff:7bff:127d
123.255.18.126 0:0:0:0:0:ffff:7bff:127e
123.255.18.127 0:0:0:0:0:ffff:7bff:127f
123.255.18.128 0:0:0:0:0:ffff:7bff:1280
123.255.18.129 0:0:0:0:0:ffff:7bff:1281
123.255.18.130 0:0:0:0:0:ffff:7bff:1282
123.255.18.131 0:0:0:0:0:ffff:7bff:1283
123.255.18.132 0:0:0:0:0:ffff:7bff:1284
123.255.18.133 0:0:0:0:0:ffff:7bff:1285
123.255.18.134 0:0:0:0:0:ffff:7bff:1286
123.255.18.135 0:0:0:0:0:ffff:7bff:1287
123.255.18.136 0:0:0:0:0:ffff:7bff:1288
123.255.18.137 0:0:0:0:0:ffff:7bff:1289
123.255.18.138 0:0:0:0:0:ffff:7bff:128a
123.255.18.139 0:0:0:0:0:ffff:7bff:128b
123.255.18.140 0:0:0:0:0:ffff:7bff:128c
123.255.18.141 0:0:0:0:0:ffff:7bff:128d
123.255.18.142 0:0:0:0:0:ffff:7bff:128e
123.255.18.143 0:0:0:0:0:ffff:7bff:128f
123.255.18.144 0:0:0:0:0:ffff:7bff:1290
123.255.18.145 0:0:0:0:0:ffff:7bff:1291
123.255.18.146 0:0:0:0:0:ffff:7bff:1292
123.255.18.147 0:0:0:0:0:ffff:7bff:1293
123.255.18.148 0:0:0:0:0:ffff:7bff:1294
123.255.18.149 0:0:0:0:0:ffff:7bff:1295
123.255.18.150 0:0:0:0:0:ffff:7bff:1296
123.255.18.151 0:0:0:0:0:ffff:7bff:1297
123.255.18.152 0:0:0:0:0:ffff:7bff:1298
123.255.18.153 0:0:0:0:0:ffff:7bff:1299
123.255.18.154 0:0:0:0:0:ffff:7bff:129a
123.255.18.155 0:0:0:0:0:ffff:7bff:129b
123.255.18.156 0:0:0:0:0:ffff:7bff:129c
123.255.18.157 0:0:0:0:0:ffff:7bff:129d
123.255.18.158 0:0:0:0:0:ffff:7bff:129e
123.255.18.159 0:0:0:0:0:ffff:7bff:129f
123.255.18.160 0:0:0:0:0:ffff:7bff:12a0
123.255.18.161 0:0:0:0:0:ffff:7bff:12a1
123.255.18.162 0:0:0:0:0:ffff:7bff:12a2
123.255.18.163 0:0:0:0:0:ffff:7bff:12a3
123.255.18.164 0:0:0:0:0:ffff:7bff:12a4
123.255.18.165 0:0:0:0:0:ffff:7bff:12a5
123.255.18.166 0:0:0:0:0:ffff:7bff:12a6
123.255.18.167 0:0:0:0:0:ffff:7bff:12a7
123.255.18.168 0:0:0:0:0:ffff:7bff:12a8
123.255.18.169 0:0:0:0:0:ffff:7bff:12a9
123.255.18.170 0:0:0:0:0:ffff:7bff:12aa
123.255.18.171 0:0:0:0:0:ffff:7bff:12ab
123.255.18.172 0:0:0:0:0:ffff:7bff:12ac
123.255.18.173 0:0:0:0:0:ffff:7bff:12ad
123.255.18.174 0:0:0:0:0:ffff:7bff:12ae
123.255.18.175 0:0:0:0:0:ffff:7bff:12af
123.255.18.176 0:0:0:0:0:ffff:7bff:12b0
123.255.18.177 0:0:0:0:0:ffff:7bff:12b1
123.255.18.178 0:0:0:0:0:ffff:7bff:12b2
123.255.18.179 0:0:0:0:0:ffff:7bff:12b3
123.255.18.180 0:0:0:0:0:ffff:7bff:12b4


123.255.18.181 0:0:0:0:0:ffff:7bff:12b5
123.255.18.182 0:0:0:0:0:ffff:7bff:12b6
123.255.18.183 0:0:0:0:0:ffff:7bff:12b7
123.255.18.184 0:0:0:0:0:ffff:7bff:12b8
123.255.18.185 0:0:0:0:0:ffff:7bff:12b9
123.255.18.186 0:0:0:0:0:ffff:7bff:12ba
123.255.18.187 0:0:0:0:0:ffff:7bff:12bb
123.255.18.188 0:0:0:0:0:ffff:7bff:12bc
123.255.18.189 0:0:0:0:0:ffff:7bff:12bd
123.255.18.190 0:0:0:0:0:ffff:7bff:12be
123.255.18.191 0:0:0:0:0:ffff:7bff:12bf
123.255.18.192 0:0:0:0:0:ffff:7bff:12c0
123.255.18.193 0:0:0:0:0:ffff:7bff:12c1
123.255.18.194 0:0:0:0:0:ffff:7bff:12c2
123.255.18.195 0:0:0:0:0:ffff:7bff:12c3
123.255.18.196 0:0:0:0:0:ffff:7bff:12c4
123.255.18.197 0:0:0:0:0:ffff:7bff:12c5
123.255.18.198 0:0:0:0:0:ffff:7bff:12c6
123.255.18.199 0:0:0:0:0:ffff:7bff:12c7
123.255.18.200 0:0:0:0:0:ffff:7bff:12c8
123.255.18.201 0:0:0:0:0:ffff:7bff:12c9
123.255.18.202 0:0:0:0:0:ffff:7bff:12ca
123.255.18.203 0:0:0:0:0:ffff:7bff:12cb
123.255.18.204 0:0:0:0:0:ffff:7bff:12cc
123.255.18.205 0:0:0:0:0:ffff:7bff:12cd
123.255.18.206 0:0:0:0:0:ffff:7bff:12ce
123.255.18.207 0:0:0:0:0:ffff:7bff:12cf
123.255.18.208 0:0:0:0:0:ffff:7bff:12d0
123.255.18.209 0:0:0:0:0:ffff:7bff:12d1
123.255.18.210 0:0:0:0:0:ffff:7bff:12d2
123.255.18.211 0:0:0:0:0:ffff:7bff:12d3
123.255.18.212 0:0:0:0:0:ffff:7bff:12d4
123.255.18.213 0:0:0:0:0:ffff:7bff:12d5
123.255.18.214 0:0:0:0:0:ffff:7bff:12d6
123.255.18.215 0:0:0:0:0:ffff:7bff:12d7
123.255.18.216 0:0:0:0:0:ffff:7bff:12d8
123.255.18.217 0:0:0:0:0:ffff:7bff:12d9
123.255.18.218 0:0:0:0:0:ffff:7bff:12da
123.255.18.219 0:0:0:0:0:ffff:7bff:12db
123.255.18.220 0:0:0:0:0:ffff:7bff:12dc
123.255.18.221 0:0:0:0:0:ffff:7bff:12dd
123.255.18.222 0:0:0:0:0:ffff:7bff:12de
123.255.18.223 0:0:0:0:0:ffff:7bff:12df
123.255.18.224 0:0:0:0:0:ffff:7bff:12e0
123.255.18.225 0:0:0:0:0:ffff:7bff:12e1
123.255.18.226 0:0:0:0:0:ffff:7bff:12e2
123.255.18.227 0:0:0:0:0:ffff:7bff:12e3
123.255.18.228 0:0:0:0:0:ffff:7bff:12e4
123.255.18.229 0:0:0:0:0:ffff:7bff:12e5
123.255.18.230 0:0:0:0:0:ffff:7bff:12e6
123.255.18.231 0:0:0:0:0:ffff:7bff:12e7
123.255.18.232 0:0:0:0:0:ffff:7bff:12e8
123.255.18.233 0:0:0:0:0:ffff:7bff:12e9
123.255.18.234 0:0:0:0:0:ffff:7bff:12ea
123.255.18.235 0:0:0:0:0:ffff:7bff:12eb
123.255.18.236 0:0:0:0:0:ffff:7bff:12ec
123.255.18.237 0:0:0:0:0:ffff:7bff:12ed
123.255.18.238 0:0:0:0:0:ffff:7bff:12ee
123.255.18.239 0:0:0:0:0:ffff:7bff:12ef
123.255.18.240 0:0:0:0:0:ffff:7bff:12f0
123.255.18.241 0:0:0:0:0:ffff:7bff:12f1
123.255.18.242 0:0:0:0:0:ffff:7bff:12f2
123.255.18.243 0:0:0:0:0:ffff:7bff:12f3
123.255.18.244 0:0:0:0:0:ffff:7bff:12f4
123.255.18.245 0:0:0:0:0:ffff:7bff:12f5
123.255.18.246 0:0:0:0:0:ffff:7bff:12f6
123.255.18.247 0:0:0:0:0:ffff:7bff:12f7
123.255.18.248 0:0:0:0:0:ffff:7bff:12f8
123.255.18.249 0:0:0:0:0:ffff:7bff:12f9
123.255.18.250 0:0:0:0:0:ffff:7bff:12fa
123.255.18.251 0:0:0:0:0:ffff:7bff:12fb
123.255.18.252 0:0:0:0:0:ffff:7bff:12fc
123.255.18.253 0:0:0:0:0:ffff:7bff:12fd
123.255.18.254 0:0:0:0:0:ffff:7bff:12fe
123.255.18.255 0:0:0:0:0:ffff:7bff:12ff


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.