1 通过网站查询：http://www.123cha.com/
2 通过ping的方式：
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C:\Documents and Settings\Administrator>ping www.qq.com -r 2
Pinging www.qq.com [222.73.78.181] with 32 bytes of data:
Reply from 222.73.78.181: bytes=32 time=7ms TTL=58
Route: 114.86.24.101 ->
124.74.12.194
Reply from 222.73.78.181: bytes=32 time=7ms TTL=58
Route: 114.86.24.101 ->
124.74.12.194
Reply from 222.73.78.181: bytes=32 time=27ms TTL=58
Route: 114.86.24.101 ->
124.74.12.194
Reply from 222.73.78.181: bytes=32 time=10ms TTL=58
Route: 114.86.24.101 ->
124.74.12.194
Ping statistics for 222.73.78.181:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 7ms, Maximum = 27ms, Average = 12ms
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222.73.78.181 www.qq.com的IP
114.86.24.101 你自己的外网IP
124.74.12.194 你的上一层IP，应该是所在城市的某个区的IP
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