asp实现限制IP或IP段访问网站代码

<%
''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)) ifcint(allow1(i))=cint(ipstr(i))then
check(i)=true
checkip=true
exitfor
else
ifcint(ipstr(i)) 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)) 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
%>