Restrict a segment of IP address

IP Address |IP Address

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

function Num2ip (NIP)
iip1 = Int (nip/256/256/256)
iip2 = Int ((nip-iip1*256*256*256)/256/256)
IIP3 = Int ((nip-iip1*256*256*256-iip2*256*256)/256)
IIP4 = Int ((nip-iip1*256*256*256-iip2*256*256-iip3*256) mod 256)
Iip0 = Iip1 & "." & Iip2 & "." &iip3 & "." & IIP4
Num2ip = Iip0
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> your IP is banned </center>")
Response.End
End If