利用ASP代码实现对 IP 的访问限制

这是以前用ASP写的，本想改成ASP.net的给大家，后来想大家能看懂算法就行了。IP比对的关键是IP地址的线性化，下面就是代码。

"可以进入的ip 
"218.7.44.0 - 218.7.45.253 
"61.180.240.0 - 61.180.240.253 
 
"202.118.208.0 - 202.118.223.253 
" 
"218.7.44.0 3657903103 
"218.7.45.253 3657903612 
" 
"61.180.240.0 1035268095 
"61.180.240.253 1035268348 
" 
"202.118.208.0 3396784127 
"202.118.223.253 3396788220 


ip=request.servervariables("remote_addr") 
sip=split(ip,".") 
num=cint(sip(0))*256*256*256+cint(sip(1))*256*256+

cint(sip(2))*256+cint(sip(3))-1 
response.write(ip) 
response.write("<br>") 
if ((num>=3657903103 and num<=3657903612) or 

(num>=1035268095 and num<=1035268348) 
or (num>=3396784127 and num<=3396788220)) then 
response.write("抱歉，您的ip不合法！") 
response.End() 
else 
response.write("您的ip合法") 
end if