Code used by Asp to restrict IP Access to prevent a certain IP segment from accessing this site

Copy codeThe Code is as follows: <%
''Get the visitor's address
Ip = Request. ServerVariables ("REMOTE_ADDR ")
''The allowed IP address range is 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''
Response. write "Access prohibited"
Exitfunction
Endif
Fori = 0 toubound (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
%>

Add the following code to your ASP page to test the effect:Copy codeThe Code is as follows: <%
'The set of blocked IP addresses (segments). The asterisk is a wildcard and is usually stored in the configuration file.
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 & "Access prohibited from IP addresses ")
Response. End ()
End If
'Parameter vBadIP: IP segment to be blocked, IP address set. Use the | symbol to separate multiple IP addresses (segments)
'Return Bool: True: the user IP address is in the blocked range; False: otherwise
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
''Return the customer IP Address
Function GetIP ()
Dim IP
IP = Request. ServerVariables ("HTTP_X_FORWARDED_FOR ")
If IP = "" Then IP = Request. ServerVariables ("REMOTE_ADDR ")
GetIP = IP
End Function
%>

In this way, you can restrict the IP address segments for Website access. You can set the IP address segments based on the region.
I used this method to prevent users from using rogue software to maliciously publish information to my website!