Asp限制IP访问 阻止某一个IP段禁止访问本站的代码

<% 
''获取访问者的地址 
ip=Request.ServerVariables("REMOTE_ADDR") 
''允许的IP地址段为10.0.0.0～10.68.63.255 
allowip1="10.0.0.0" 
allowip2="10.68.10.71" 
response.writecheckip(ip,allowip1,allowip2) 
functioncheckip(ip,allowip1,allowip2) 
dimcheck(4) 
checkip=false 
ipstr=split(ip,".") 
allow1=split(allowip1,".") 
allow2=split(allowip2,".") 
ifcint(allow1(0))>cint(allow2(0))then''判断IP地址段是否合法 
response.write"禁止访问" 
exitfunction 
endif 
fori=0toubound(ipstr) 
ifcint(allow1(i))<cint(allow2(i))then 
ifcint(allow1(i))=cint(ipstr(i))then 
check(i)=true 
checkip=true 
exitfor 
else 
ifcint(ipstr(i))<cint(allow2(i))then 
check(i)=true 
checkip=true 
exitfor 
else 
ifcint(ipstr(i))>cint(allow2(i))then 
check(i)=false 
checkip=false 
exitfor 
else 
check(i)=true 
checkip=true 
endif 
endif 
endif 
else 
ifcint(allow1(i))>cint(ipstr(i))orcint(allow1(i))<cint(ipstr(i))then 
check(i)=false 
checkip=false 
ifi<>ubound(ipstr)then 
exitfor 
endif 
else 
check(i)=true 
endif 
endif 
next 
if(check(0)=trueandcheck(1)=trueandcheck(2)=trueandcheck(3)=false)and(cint(allow2(2))>cint(ipstr(2)))then 
checkip=true 
endif 
endfunction 
%> 
 
把以下代码加入到你的ASP页面就可以测试到效果了： 
 代码如下:

<% 
'受屏蔽IP地址(段)集合，星号为通配符，通常保存于配置文件中。 
Const BadIPGroup = "192.168.1.*|202.68.*.*|*.12.55.34|185.*.96.24|127.*.0.1|192.168.0.1" 
If IsForbidIP(BadIPGroup) = True Then 
Response.Write(GetIP &"IP地址禁止访问") 
Response.End() 
End If 
'参数vBadIP：要屏蔽的IP段,IP地址集合，用|符号分隔多个IP地址(段) 
'返回Bool：True用户IP在被屏蔽范围，False 反之 
Function IsForbidIP(vBadIP) 
Dim counter, arrIPPart, arrBadIP, arrBadIPPart, i, j 
arrBadIP = Split(vBadIP, "|") 
arrIPPart = Split(GetIP(), ".") 
For i = 0 To UBound(arrBadIP) 
counter = 0 
arrBadIPPart = Split(arrBadIP(i), ".") 
For j = 0 To UBound(arrIPPart) 
If(arrBadIPPart(j)) = "*" or Cstr(arrIPPart(j)) = Cstr(arrBadIPPart(j)) Then 
counter = counter + 1 
End If 
Next 
If counter = 4 Then 
IsForbidIP = True 
Exit Function 
End If 
Next 
IsForbidIP = False 
End Function 
''返回客户IP地址 
Function GetIP() 
Dim IP 
IP = Request.ServerVariables("HTTP_X_FORWARDED_FOR") 
If IP = "" Then IP = Request.ServerVariables("REMOTE_ADDR") 
GetIP = IP 
End Function 
%> 
 
　　这样就可以限制网站访问的IP段了，你可以根据地区的IP段来设置。 
　　我就是用这个方法防止外地用户使用流氓软件恶意到我网站发布信息的!