原理：先把 192.168.1.13 变成16进制的 c0.a8.01.0d ，再去了“.”后转成10进制的 3232235789 即可。
<%
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="0.0.1.0"
testInt = ip2int(testIP)
response.write testIP & " will be encoded to <font color=red>" & testInt & "</font><br>"
response.write testIP & " will be decoded to <font color=red>" & int2ip(testInt) & "</font><br>"
%>