asp检查ip地址是否为内网/私有ip地址

<%
function IpToNumber(ip)'IP地址转为数字
  arr=split(ip,".")
  IpToNumber=256*256*256*clng(arr(0))+256*256*clng(arr(1))+256*clng(arr(2))+clng(arr(3))
end function
function IsPrivateIp(ip)'判断给定的IP地址是否内网/私有ip地址
  if instr(ip,"127.")=1 then'回环IP地址
    IsPrivateIp=true:exit function
  end if
  ABegin=IpToNumber("10.0.0.0"):AEnd=IpToNumber("10.255.255.255")'A类私有IP地址
  BBegin=IpToNumber("172.16.0.0"):BEnd=IpToNumber("172.31.255.255")'B类私有IP地址
  CBegin=IpToNumber("192.168.0.0"):CEnd=IpToNumber("192.168.255.255")'C类私有IP地址
  IpNum=IpToNumber(ip)
  IsPrivateIp=(ABegin<=IpNum and IpNum<=AEnd) or (BBegin<=IpNum and IpNum<=BEnd) or (CBegin<=IpNum and IpNum<=CEnd)
end function
Response.Write IsPrivateIp("11.255.255.255")&"<br>"'false
Response.Write IsPrivateIp("182.255.255.255")&"<br>"'false
Response.Write IsPrivateIp("172.30.255.255")&"<br>"'true
Response.Write IsPrivateIp("192.168.205.2")&"<br>"'true
Response.Write IsPrivateIp("127.168.205.2")'true
 %>