<%
''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
%>

<%
'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
%>