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''218.7.44.03657903103'218.7.45.2533657903612''61.180.240.01035268095'61.180.240.2531035268348''202.118.208.03396784127'202.118.223.2533396788220ip=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))-1response.write(ip)response.write("<br>")if((num>=3657903103andnum<=3657903612)or(num>=1035268095andnum<=1035268348)or(num>=3396784127andnum<=3396788220))thenresponse.write("抱歉，您的ip不合法！")response.End()elseresponse.write("您的ip合法")endif