限制某段IP地址访问网页的一个列子：

function IP2Num(sip)
dim str1,str2,str3,str4
dim num
IP2Num=0
if isnumeric(left(sip,2)) then
str1=left(sip,instr(sip,".")-1)
sip=mid(sip,instr(sip,".")+1)
str2=left(sip,instr(sip,".")-1)
sip=mid(sip,instr(sip,".")+1)
str3=left(sip,instr(sip,".")-1)
str4=mid(sip,instr(sip,".")+1)
num=cint(str1)*256*256*256+cint(str2)*256*256+cint(str3)*256+cint(str4)-1
IP2Num = num
end if
end function
userIPnum = IP2Num(Request.ServerVariables("REMOTE_ADDR"))
if userIPnum > IP2Num("192.168.0.0") and userIPnum < IP2Num("192.168.0.255") then
response.write ("<center>您的IP被禁止</center>")
response.end
end if