IP 地址列表: 51.61.21.* (51.61.21.0 - 51.61.21.254)
這是第壹個字節為51,第二個字節為61,第三個字節為21,第四個字節在0 - 255之間的IP地址列表,表示為51.61.21.* (51.61.21.0 - 51.61.21.255)。
這個IP地址列表中包含256個IP地址,我們以其中壹個IP地址51.61.21.1為例,來描述這個IP的屬性:
但這只是其中1個IP地址的例子,並不代表這個列表中所有的IP地址都有同樣的屬性,如果需要了解其它IP和更詳細的IP地址段信息,請點擊下面列表中的標題鏈接。

內容:
2. A類IP地址列表
A類IP地址是指:在IP地址的四段號碼(例如:字節1.字節2.字節3.字節4)中,第壹段號碼(字節1)為網絡號碼,剩下的後三段號碼(字節2.字節3.字節4)為本地計算機的號碼。 如果用二進制表示IP地址的話,A類IP地址就由1字節的網絡地址和3字節主機地址組成,網絡地址的最高位必須是'0'。 A類IP地址範圍:1.0.0.0 ~ 127.255.255.255,可用IP地址範圍:1.0.0.1 ~ 127.255.255.254。 A類IP地址中網絡的標識長度為7位,主機標識的長度為24位,A類網絡地址數量較少(2 ^ 7 - 2 = 126個),可以用於容納1600多萬計算機的大型網絡(2 ^ 24 - 2 = 16777214個)。 如果您需要了解A類IP段更詳細的IP地址信息,請點擊A類IP地址列表中的標題鏈接。
- 51.61.21.0
- 51.61.21.1
- 51.61.21.2
- 51.61.21.3
- 51.61.21.4
- 51.61.21.5
- 51.61.21.6
- 51.61.21.7
- 51.61.21.8
- 51.61.21.9
- 51.61.21.10
- 51.61.21.11
- 51.61.21.12
- 51.61.21.13
- 51.61.21.14
- 51.61.21.15
- 51.61.21.16
- 51.61.21.17
- 51.61.21.18
- 51.61.21.19
- 51.61.21.20
- 51.61.21.21
- 51.61.21.22
- 51.61.21.23
- 51.61.21.24
- 51.61.21.25
- 51.61.21.26
- 51.61.21.27
- 51.61.21.28
- 51.61.21.29
- 51.61.21.30
- 51.61.21.31
- 51.61.21.32
- 51.61.21.33
- 51.61.21.34
- 51.61.21.35
- 51.61.21.36
- 51.61.21.37
- 51.61.21.38
- 51.61.21.39
- 51.61.21.40
- 51.61.21.41
- 51.61.21.42
- 51.61.21.43
- 51.61.21.44
- 51.61.21.45
- 51.61.21.46
- 51.61.21.47
- 51.61.21.48
- 51.61.21.49
- 51.61.21.50
- 51.61.21.51
- 51.61.21.52
- 51.61.21.53
- 51.61.21.54
- 51.61.21.55
- 51.61.21.56
- 51.61.21.57
- 51.61.21.58
- 51.61.21.59
- 51.61.21.60
- 51.61.21.61
- 51.61.21.62
- 51.61.21.63
- 51.61.21.64
- 51.61.21.65
- 51.61.21.66
- 51.61.21.67
- 51.61.21.68
- 51.61.21.69
- 51.61.21.70
- 51.61.21.71
- 51.61.21.72
- 51.61.21.73
- 51.61.21.74
- 51.61.21.75
- 51.61.21.76
- 51.61.21.77
- 51.61.21.78
- 51.61.21.79
- 51.61.21.80
- 51.61.21.81
- 51.61.21.82
- 51.61.21.83
- 51.61.21.84
- 51.61.21.85
- 51.61.21.86
- 51.61.21.87
- 51.61.21.88
- 51.61.21.89
- 51.61.21.90
- 51.61.21.91
- 51.61.21.92
- 51.61.21.93
- 51.61.21.94
- 51.61.21.95
- 51.61.21.96
- 51.61.21.97
- 51.61.21.98
- 51.61.21.99
- 51.61.21.100
- 51.61.21.101
- 51.61.21.102
- 51.61.21.103
- 51.61.21.104
- 51.61.21.105
- 51.61.21.106
- 51.61.21.107
- 51.61.21.108
- 51.61.21.109
- 51.61.21.110
- 51.61.21.111
- 51.61.21.112
- 51.61.21.113
- 51.61.21.114
- 51.61.21.115
- 51.61.21.116
- 51.61.21.117
- 51.61.21.118
- 51.61.21.119
- 51.61.21.120
- 51.61.21.121
- 51.61.21.122
- 51.61.21.123
- 51.61.21.124
- 51.61.21.125
- 51.61.21.126
- 51.61.21.127
- 51.61.21.128
- 51.61.21.129
- 51.61.21.130
- 51.61.21.131
- 51.61.21.132
- 51.61.21.133
- 51.61.21.134
- 51.61.21.135
- 51.61.21.136
- 51.61.21.137
- 51.61.21.138
- 51.61.21.139
- 51.61.21.140
- 51.61.21.141
- 51.61.21.142
- 51.61.21.143
- 51.61.21.144
- 51.61.21.145
- 51.61.21.146
- 51.61.21.147
- 51.61.21.148
- 51.61.21.149
- 51.61.21.150
- 51.61.21.151
- 51.61.21.152
- 51.61.21.153
- 51.61.21.154
- 51.61.21.155
- 51.61.21.156
- 51.61.21.157
- 51.61.21.158
- 51.61.21.159
- 51.61.21.160
- 51.61.21.161
- 51.61.21.162
- 51.61.21.163
- 51.61.21.164
- 51.61.21.165
- 51.61.21.166
- 51.61.21.167
- 51.61.21.168
- 51.61.21.169
- 51.61.21.170
- 51.61.21.171
- 51.61.21.172
- 51.61.21.173
- 51.61.21.174
- 51.61.21.175
- 51.61.21.176
- 51.61.21.177
- 51.61.21.178
- 51.61.21.179
- 51.61.21.180
- 51.61.21.181
- 51.61.21.182
- 51.61.21.183
- 51.61.21.184
- 51.61.21.185
- 51.61.21.186
- 51.61.21.187
- 51.61.21.188
- 51.61.21.189
- 51.61.21.190
- 51.61.21.191
- 51.61.21.192
- 51.61.21.193
- 51.61.21.194
- 51.61.21.195
- 51.61.21.196
- 51.61.21.197
- 51.61.21.198
- 51.61.21.199
- 51.61.21.200
- 51.61.21.201
- 51.61.21.202
- 51.61.21.203
- 51.61.21.204
- 51.61.21.205
- 51.61.21.206
- 51.61.21.207
- 51.61.21.208
- 51.61.21.209
- 51.61.21.210
- 51.61.21.211
- 51.61.21.212
- 51.61.21.213
- 51.61.21.214
- 51.61.21.215
- 51.61.21.216
- 51.61.21.217
- 51.61.21.218
- 51.61.21.219
- 51.61.21.220
- 51.61.21.221
- 51.61.21.222
- 51.61.21.223
- 51.61.21.224
- 51.61.21.225
- 51.61.21.226
- 51.61.21.227
- 51.61.21.228
- 51.61.21.229
- 51.61.21.230
- 51.61.21.231
- 51.61.21.232
- 51.61.21.233
- 51.61.21.234
- 51.61.21.235
- 51.61.21.236
- 51.61.21.237
- 51.61.21.238
- 51.61.21.239
- 51.61.21.240
- 51.61.21.241
- 51.61.21.242
- 51.61.21.243
- 51.61.21.244
- 51.61.21.245
- 51.61.21.246
- 51.61.21.247
- 51.61.21.248
- 51.61.21.249
- 51.61.21.250
- 51.61.21.251
- 51.61.21.252
- 51.61.21.253
- 51.61.21.254
- 51.61.21.255