ASP limit IP Access block an IP segment prohibit access to the site's code _ Application Tips

Copy Code code as follows:

<%
"Get the address of the visitor
Ip=request.servervariables ("REMOTE_ADDR")
' The allowed IP address segment 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 ' to determine if the IP address segment is legitimate
Response.Write "No Access"
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
%>

Add the following code to your ASP page to test the effect:

Copy Code code as follows:

<%
A collection of masked IP addresses (segments) with an asterisk of wildcard characters, usually stored in a 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 & "IP address No Access")
Response.End ()
End If
' Parameter Vbadip: IP segment to be screened, set of IP addresses, separate multiple IP addresses by | symbol (segment)
' Returns bool:true User IP in the masked range, False conversely
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 client 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
%>

This restricts access to the IP segment of the site, and you can set it according to the region's IP segment.
I use this method to prevent foreign users from using rogue software malicious to my site to publish information!