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
66.111.18.1 0:0:0:0:0:ffff:426f:1201
66.111.18.2 0:0:0:0:0:ffff:426f:1202
66.111.18.3 0:0:0:0:0:ffff:426f:1203
66.111.18.4 0:0:0:0:0:ffff:426f:1204
66.111.18.5 0:0:0:0:0:ffff:426f:1205
66.111.18.6 0:0:0:0:0:ffff:426f:1206
66.111.18.7 0:0:0:0:0:ffff:426f:1207
66.111.18.8 0:0:0:0:0:ffff:426f:1208
66.111.18.9 0:0:0:0:0:ffff:426f:1209
66.111.18.10 0:0:0:0:0:ffff:426f:120a
66.111.18.11 0:0:0:0:0:ffff:426f:120b
66.111.18.12 0:0:0:0:0:ffff:426f:120c
66.111.18.13 0:0:0:0:0:ffff:426f:120d
66.111.18.14 0:0:0:0:0:ffff:426f:120e
66.111.18.15 0:0:0:0:0:ffff:426f:120f
66.111.18.16 0:0:0:0:0:ffff:426f:1210
66.111.18.17 0:0:0:0:0:ffff:426f:1211
66.111.18.18 0:0:0:0:0:ffff:426f:1212
66.111.18.19 0:0:0:0:0:ffff:426f:1213
66.111.18.20 0:0:0:0:0:ffff:426f:1214
66.111.18.21 0:0:0:0:0:ffff:426f:1215
66.111.18.22 0:0:0:0:0:ffff:426f:1216
66.111.18.23 0:0:0:0:0:ffff:426f:1217
66.111.18.24 0:0:0:0:0:ffff:426f:1218
66.111.18.25 0:0:0:0:0:ffff:426f:1219
66.111.18.26 0:0:0:0:0:ffff:426f:121a
66.111.18.27 0:0:0:0:0:ffff:426f:121b
66.111.18.28 0:0:0:0:0:ffff:426f:121c
66.111.18.29 0:0:0:0:0:ffff:426f:121d
66.111.18.30 0:0:0:0:0:ffff:426f:121e
66.111.18.31 0:0:0:0:0:ffff:426f:121f
66.111.18.32 0:0:0:0:0:ffff:426f:1220
66.111.18.33 0:0:0:0:0:ffff:426f:1221
66.111.18.34 0:0:0:0:0:ffff:426f:1222
66.111.18.35 0:0:0:0:0:ffff:426f:1223
66.111.18.36 0:0:0:0:0:ffff:426f:1224
66.111.18.37 0:0:0:0:0:ffff:426f:1225
66.111.18.38 0:0:0:0:0:ffff:426f:1226
66.111.18.39 0:0:0:0:0:ffff:426f:1227
66.111.18.40 0:0:0:0:0:ffff:426f:1228
66.111.18.41 0:0:0:0:0:ffff:426f:1229
66.111.18.42 0:0:0:0:0:ffff:426f:122a
66.111.18.43 0:0:0:0:0:ffff:426f:122b
66.111.18.44 0:0:0:0:0:ffff:426f:122c
66.111.18.45 0:0:0:0:0:ffff:426f:122d
66.111.18.46 0:0:0:0:0:ffff:426f:122e
66.111.18.47 0:0:0:0:0:ffff:426f:122f
66.111.18.48 0:0:0:0:0:ffff:426f:1230
66.111.18.49 0:0:0:0:0:ffff:426f:1231
66.111.18.50 0:0:0:0:0:ffff:426f:1232
66.111.18.51 0:0:0:0:0:ffff:426f:1233
66.111.18.52 0:0:0:0:0:ffff:426f:1234
66.111.18.53 0:0:0:0:0:ffff:426f:1235
66.111.18.54 0:0:0:0:0:ffff:426f:1236
66.111.18.55 0:0:0:0:0:ffff:426f:1237
66.111.18.56 0:0:0:0:0:ffff:426f:1238
66.111.18.57 0:0:0:0:0:ffff:426f:1239
66.111.18.58 0:0:0:0:0:ffff:426f:123a
66.111.18.59 0:0:0:0:0:ffff:426f:123b
66.111.18.60 0:0:0:0:0:ffff:426f:123c


66.111.18.61 0:0:0:0:0:ffff:426f:123d
66.111.18.62 0:0:0:0:0:ffff:426f:123e
66.111.18.63 0:0:0:0:0:ffff:426f:123f
66.111.18.64 0:0:0:0:0:ffff:426f:1240
66.111.18.65 0:0:0:0:0:ffff:426f:1241
66.111.18.66 0:0:0:0:0:ffff:426f:1242
66.111.18.67 0:0:0:0:0:ffff:426f:1243
66.111.18.68 0:0:0:0:0:ffff:426f:1244
66.111.18.69 0:0:0:0:0:ffff:426f:1245
66.111.18.70 0:0:0:0:0:ffff:426f:1246
66.111.18.71 0:0:0:0:0:ffff:426f:1247
66.111.18.72 0:0:0:0:0:ffff:426f:1248
66.111.18.73 0:0:0:0:0:ffff:426f:1249
66.111.18.74 0:0:0:0:0:ffff:426f:124a
66.111.18.75 0:0:0:0:0:ffff:426f:124b
66.111.18.76 0:0:0:0:0:ffff:426f:124c
66.111.18.77 0:0:0:0:0:ffff:426f:124d
66.111.18.78 0:0:0:0:0:ffff:426f:124e
66.111.18.79 0:0:0:0:0:ffff:426f:124f
66.111.18.80 0:0:0:0:0:ffff:426f:1250
66.111.18.81 0:0:0:0:0:ffff:426f:1251
66.111.18.82 0:0:0:0:0:ffff:426f:1252
66.111.18.83 0:0:0:0:0:ffff:426f:1253
66.111.18.84 0:0:0:0:0:ffff:426f:1254
66.111.18.85 0:0:0:0:0:ffff:426f:1255
66.111.18.86 0:0:0:0:0:ffff:426f:1256
66.111.18.87 0:0:0:0:0:ffff:426f:1257
66.111.18.88 0:0:0:0:0:ffff:426f:1258
66.111.18.89 0:0:0:0:0:ffff:426f:1259
66.111.18.90 0:0:0:0:0:ffff:426f:125a
66.111.18.91 0:0:0:0:0:ffff:426f:125b
66.111.18.92 0:0:0:0:0:ffff:426f:125c
66.111.18.93 0:0:0:0:0:ffff:426f:125d
66.111.18.94 0:0:0:0:0:ffff:426f:125e
66.111.18.95 0:0:0:0:0:ffff:426f:125f
66.111.18.96 0:0:0:0:0:ffff:426f:1260
66.111.18.97 0:0:0:0:0:ffff:426f:1261
66.111.18.98 0:0:0:0:0:ffff:426f:1262
66.111.18.99 0:0:0:0:0:ffff:426f:1263
66.111.18.100 0:0:0:0:0:ffff:426f:1264
66.111.18.101 0:0:0:0:0:ffff:426f:1265
66.111.18.102 0:0:0:0:0:ffff:426f:1266
66.111.18.103 0:0:0:0:0:ffff:426f:1267
66.111.18.104 0:0:0:0:0:ffff:426f:1268
66.111.18.105 0:0:0:0:0:ffff:426f:1269
66.111.18.106 0:0:0:0:0:ffff:426f:126a
66.111.18.107 0:0:0:0:0:ffff:426f:126b
66.111.18.108 0:0:0:0:0:ffff:426f:126c
66.111.18.109 0:0:0:0:0:ffff:426f:126d
66.111.18.110 0:0:0:0:0:ffff:426f:126e
66.111.18.111 0:0:0:0:0:ffff:426f:126f
66.111.18.112 0:0:0:0:0:ffff:426f:1270
66.111.18.113 0:0:0:0:0:ffff:426f:1271
66.111.18.114 0:0:0:0:0:ffff:426f:1272
66.111.18.115 0:0:0:0:0:ffff:426f:1273
66.111.18.116 0:0:0:0:0:ffff:426f:1274
66.111.18.117 0:0:0:0:0:ffff:426f:1275
66.111.18.118 0:0:0:0:0:ffff:426f:1276
66.111.18.119 0:0:0:0:0:ffff:426f:1277
66.111.18.120 0:0:0:0:0:ffff:426f:1278


66.111.18.121 0:0:0:0:0:ffff:426f:1279
66.111.18.122 0:0:0:0:0:ffff:426f:127a
66.111.18.123 0:0:0:0:0:ffff:426f:127b
66.111.18.124 0:0:0:0:0:ffff:426f:127c
66.111.18.125 0:0:0:0:0:ffff:426f:127d
66.111.18.126 0:0:0:0:0:ffff:426f:127e
66.111.18.127 0:0:0:0:0:ffff:426f:127f
66.111.18.128 0:0:0:0:0:ffff:426f:1280
66.111.18.129 0:0:0:0:0:ffff:426f:1281
66.111.18.130 0:0:0:0:0:ffff:426f:1282
66.111.18.131 0:0:0:0:0:ffff:426f:1283
66.111.18.132 0:0:0:0:0:ffff:426f:1284
66.111.18.133 0:0:0:0:0:ffff:426f:1285
66.111.18.134 0:0:0:0:0:ffff:426f:1286
66.111.18.135 0:0:0:0:0:ffff:426f:1287
66.111.18.136 0:0:0:0:0:ffff:426f:1288
66.111.18.137 0:0:0:0:0:ffff:426f:1289
66.111.18.138 0:0:0:0:0:ffff:426f:128a
66.111.18.139 0:0:0:0:0:ffff:426f:128b
66.111.18.140 0:0:0:0:0:ffff:426f:128c
66.111.18.141 0:0:0:0:0:ffff:426f:128d
66.111.18.142 0:0:0:0:0:ffff:426f:128e
66.111.18.143 0:0:0:0:0:ffff:426f:128f
66.111.18.144 0:0:0:0:0:ffff:426f:1290
66.111.18.145 0:0:0:0:0:ffff:426f:1291
66.111.18.146 0:0:0:0:0:ffff:426f:1292
66.111.18.147 0:0:0:0:0:ffff:426f:1293
66.111.18.148 0:0:0:0:0:ffff:426f:1294
66.111.18.149 0:0:0:0:0:ffff:426f:1295
66.111.18.150 0:0:0:0:0:ffff:426f:1296
66.111.18.151 0:0:0:0:0:ffff:426f:1297
66.111.18.152 0:0:0:0:0:ffff:426f:1298
66.111.18.153 0:0:0:0:0:ffff:426f:1299
66.111.18.154 0:0:0:0:0:ffff:426f:129a
66.111.18.155 0:0:0:0:0:ffff:426f:129b
66.111.18.156 0:0:0:0:0:ffff:426f:129c
66.111.18.157 0:0:0:0:0:ffff:426f:129d
66.111.18.158 0:0:0:0:0:ffff:426f:129e
66.111.18.159 0:0:0:0:0:ffff:426f:129f
66.111.18.160 0:0:0:0:0:ffff:426f:12a0
66.111.18.161 0:0:0:0:0:ffff:426f:12a1
66.111.18.162 0:0:0:0:0:ffff:426f:12a2
66.111.18.163 0:0:0:0:0:ffff:426f:12a3
66.111.18.164 0:0:0:0:0:ffff:426f:12a4
66.111.18.165 0:0:0:0:0:ffff:426f:12a5
66.111.18.166 0:0:0:0:0:ffff:426f:12a6
66.111.18.167 0:0:0:0:0:ffff:426f:12a7
66.111.18.168 0:0:0:0:0:ffff:426f:12a8
66.111.18.169 0:0:0:0:0:ffff:426f:12a9
66.111.18.170 0:0:0:0:0:ffff:426f:12aa
66.111.18.171 0:0:0:0:0:ffff:426f:12ab
66.111.18.172 0:0:0:0:0:ffff:426f:12ac
66.111.18.173 0:0:0:0:0:ffff:426f:12ad
66.111.18.174 0:0:0:0:0:ffff:426f:12ae
66.111.18.175 0:0:0:0:0:ffff:426f:12af
66.111.18.176 0:0:0:0:0:ffff:426f:12b0
66.111.18.177 0:0:0:0:0:ffff:426f:12b1
66.111.18.178 0:0:0:0:0:ffff:426f:12b2
66.111.18.179 0:0:0:0:0:ffff:426f:12b3
66.111.18.180 0:0:0:0:0:ffff:426f:12b4


66.111.18.181 0:0:0:0:0:ffff:426f:12b5
66.111.18.182 0:0:0:0:0:ffff:426f:12b6
66.111.18.183 0:0:0:0:0:ffff:426f:12b7
66.111.18.184 0:0:0:0:0:ffff:426f:12b8
66.111.18.185 0:0:0:0:0:ffff:426f:12b9
66.111.18.186 0:0:0:0:0:ffff:426f:12ba
66.111.18.187 0:0:0:0:0:ffff:426f:12bb
66.111.18.188 0:0:0:0:0:ffff:426f:12bc
66.111.18.189 0:0:0:0:0:ffff:426f:12bd
66.111.18.190 0:0:0:0:0:ffff:426f:12be
66.111.18.191 0:0:0:0:0:ffff:426f:12bf
66.111.18.192 0:0:0:0:0:ffff:426f:12c0
66.111.18.193 0:0:0:0:0:ffff:426f:12c1
66.111.18.194 0:0:0:0:0:ffff:426f:12c2
66.111.18.195 0:0:0:0:0:ffff:426f:12c3
66.111.18.196 0:0:0:0:0:ffff:426f:12c4
66.111.18.197 0:0:0:0:0:ffff:426f:12c5
66.111.18.198 0:0:0:0:0:ffff:426f:12c6
66.111.18.199 0:0:0:0:0:ffff:426f:12c7
66.111.18.200 0:0:0:0:0:ffff:426f:12c8
66.111.18.201 0:0:0:0:0:ffff:426f:12c9
66.111.18.202 0:0:0:0:0:ffff:426f:12ca
66.111.18.203 0:0:0:0:0:ffff:426f:12cb
66.111.18.204 0:0:0:0:0:ffff:426f:12cc
66.111.18.205 0:0:0:0:0:ffff:426f:12cd
66.111.18.206 0:0:0:0:0:ffff:426f:12ce
66.111.18.207 0:0:0:0:0:ffff:426f:12cf
66.111.18.208 0:0:0:0:0:ffff:426f:12d0
66.111.18.209 0:0:0:0:0:ffff:426f:12d1
66.111.18.210 0:0:0:0:0:ffff:426f:12d2
66.111.18.211 0:0:0:0:0:ffff:426f:12d3
66.111.18.212 0:0:0:0:0:ffff:426f:12d4
66.111.18.213 0:0:0:0:0:ffff:426f:12d5
66.111.18.214 0:0:0:0:0:ffff:426f:12d6
66.111.18.215 0:0:0:0:0:ffff:426f:12d7
66.111.18.216 0:0:0:0:0:ffff:426f:12d8
66.111.18.217 0:0:0:0:0:ffff:426f:12d9
66.111.18.218 0:0:0:0:0:ffff:426f:12da
66.111.18.219 0:0:0:0:0:ffff:426f:12db
66.111.18.220 0:0:0:0:0:ffff:426f:12dc
66.111.18.221 0:0:0:0:0:ffff:426f:12dd
66.111.18.222 0:0:0:0:0:ffff:426f:12de
66.111.18.223 0:0:0:0:0:ffff:426f:12df
66.111.18.224 0:0:0:0:0:ffff:426f:12e0
66.111.18.225 0:0:0:0:0:ffff:426f:12e1
66.111.18.226 0:0:0:0:0:ffff:426f:12e2
66.111.18.227 0:0:0:0:0:ffff:426f:12e3
66.111.18.228 0:0:0:0:0:ffff:426f:12e4
66.111.18.229 0:0:0:0:0:ffff:426f:12e5
66.111.18.230 0:0:0:0:0:ffff:426f:12e6
66.111.18.231 0:0:0:0:0:ffff:426f:12e7
66.111.18.232 0:0:0:0:0:ffff:426f:12e8
66.111.18.233 0:0:0:0:0:ffff:426f:12e9
66.111.18.234 0:0:0:0:0:ffff:426f:12ea
66.111.18.235 0:0:0:0:0:ffff:426f:12eb
66.111.18.236 0:0:0:0:0:ffff:426f:12ec
66.111.18.237 0:0:0:0:0:ffff:426f:12ed
66.111.18.238 0:0:0:0:0:ffff:426f:12ee
66.111.18.239 0:0:0:0:0:ffff:426f:12ef
66.111.18.240 0:0:0:0:0:ffff:426f:12f0
66.111.18.241 0:0:0:0:0:ffff:426f:12f1
66.111.18.242 0:0:0:0:0:ffff:426f:12f2
66.111.18.243 0:0:0:0:0:ffff:426f:12f3
66.111.18.244 0:0:0:0:0:ffff:426f:12f4
66.111.18.245 0:0:0:0:0:ffff:426f:12f5
66.111.18.246 0:0:0:0:0:ffff:426f:12f6
66.111.18.247 0:0:0:0:0:ffff:426f:12f7
66.111.18.248 0:0:0:0:0:ffff:426f:12f8
66.111.18.249 0:0:0:0:0:ffff:426f:12f9
66.111.18.250 0:0:0:0:0:ffff:426f:12fa
66.111.18.251 0:0:0:0:0:ffff:426f:12fb
66.111.18.252 0:0:0:0:0:ffff:426f:12fc
66.111.18.253 0:0:0:0:0:ffff:426f:12fd
66.111.18.254 0:0:0:0:0:ffff:426f:12fe
66.111.18.255 0:0:0:0:0:ffff:426f: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.