<script language="JScript" Runat="Server">
  function IPDeCode(EIP){
  var Ip1,Ip2,Ip3,Ip4;
  Ip1 = moveByteR(EIP & 0xff000000,3);
  Ip2 = moveByteR(EIP & 0x00ff0000,2);
  Ip3 = moveByteR(EIP & 0x0000ff00,1);
  Ip4 = EIP & 0x000000ff;
  return Ip1 + "." + Ip2 + "." + Ip3 + "." + Ip4;
  }
  
  function moveByteL(num,bytenum){
  return num <<= (bytenum*8)
  }
  function moveByteR(num,bytenum){
  return num >>>= (bytenum*8)
  }
  </script>
  
  在VBs中没有位操作，这样在一个页面中用到了js和vbs，并不好，如果用vbs也可以，不过罗嗦了一些，而且有一点注意，如果在vbs中split("202.102.29.6",".")，会得到202，102，29三个数，得不到最后一个6，所以需要将ip换成split("202.102.29.6" & ".",".")
  我用vbs做的，由于没有位操作，所以做得比较麻烦
  <%
  function ip2int(ipstr)
  dim iptemp,max
  iptemp = split(ipstr&".",".")
  max = ubound(iptemp)
  if max <> 4 then
  exit function
  end if
  dim a,b,i
  a = "&H"
  for i = 0 to 3
  b = Hex(iptemp(i))
  if len(b) = 1 then
  b = "0"&b
  end if
  a = a&b
  next
  ip2int = CLng(a)
  end function
  function int2ip(ip)
  dim iptemp,a,ipstr,i,length
  iptemp = Hex(ip)
  length = 8 - len(iptemp)
  for i = 1 to length
  iptemp = "0" & iptemp
  next
  a = left(iptemp,2)
  a = "&H" & a
  i = CInt(a)
  a = CStr(i)
  ipstr = a & "."
  a = mid(iptemp,3,2)
  a = "&H" & a
  i = CInt(a)
  a = CStr(i)
  ipstr = ipstr & a & "."
  a = mid(iptemp,5,2)
  a = "&H" & a
  i = CInt(a)
  a = CStr(i)
  ipstr = ipstr & a & "."
  a = right(iptemp,2)
  a = "&H" & a
  i = CInt(a)
  a = CStr(i)
  ipstr = ipstr & a
  int2ip = ipstr
  end function
  dim testIP,testInt
  testIP="202.102.29.6"
  testInt = ip2int(testIP)
  response.write testIP & " will be encoded to <font color=red>" & testInt & "</font><br>"
  response.write testIP & " will be dencoded to <font color=red>" & int2ip(testInt) & "</font><br>"
  %>