Function getIpvalue(clientIP)'得到客戶端的IP轉換成長整型，返回值getIpvalue 
On Error Resume Next 
Dim strIp, array_Ip 
strIp=0 
array_Ip = Split(clientIP,".") 
If UBound(array_Ip)<>3 Then 
getIpvalue=0 
Exit Function 
End If 
For i=0 To 3 
strIp=strIp+(CInt(array_Ip(i))*(256^(3-i))) 
Next 
getIpvalue=strIp 
If Err Then getIpvalue=0 
End Function 
clientIP=request.ServerVariables("REMOTE_HOST") 
IpValue=getIpvalue(clientIP) 
strSql="select top 1 City from [Ipaddress] where "&IpValue&" 
between Ip1 and Ip2" 
Set RsIp=conn.execute(strSql) 
If RsIp.bof and RsIp.eof then 
UrlCity="未知" 
Else 
UrlCity=RsIp.Fields.Item("City").Value 
End If 
if instr(UrlCity,"廣州")<>0 then 
response.Redirect("//m.ythuaji.com.cn") 
end if 
if instr(UrlCity,"深圳")<>0 then 
response.Redirect("http://img.zzvips.com") 
end if 
if instr(UrlCity,"上海")<>0 then 
response.Redirect("http://xiazai.zzvips.com") 
end if 
所用到的IP數據庫可以去網上down一個回來