Reverse IP Domain Check?

by

After reading the comments, bobince is definitely right and these 2 should be used in tandem with each other. For best results you should use the reverse DNS lookup here as well as to use the passive DNS replication.

string IpAddressString = "208.5.42.49"; //eggheadcafe

try 
{
   IPAddress hostIPAddress = IPAddress.Parse(IpAddressString);
   IPHostEntry hostInfo = Dns.GetHostByAddress(hostIPAddress);
   // Get the IP address list that resolves to the host names contained in 
   // the Alias property.
   IPAddress[] address = hostInfo.AddressList;
   // Get the alias names of the addresses in the IP address list.
   String[] alias = hostInfo.Aliases;

   Console.WriteLine("Host name : " + hostInfo.HostName);
   Console.WriteLine("\nAliases :");
   for(int index=0; index < alias.Length; index++) {
     Console.WriteLine(alias[index]);
   } 
   Console.WriteLine("\nIP address list : ");
   for(int index=0; index < address.Length; index++) {
      Console.WriteLine(address[index]);
   }
}
catch(SocketException e) 
{
     Console.WriteLine("SocketException caught!!!");
   Console.WriteLine("Source : " + e.Source);
   Console.WriteLine("Message : " + e.Message);
}
catch(FormatException e)
{
     Console.WriteLine("FormatException caught!!!");
   Console.WriteLine("Source : " + e.Source);
   Console.WriteLine("Message : " + e.Message);
}
catch(ArgumentNullException e)
{
     Console.WriteLine("ArgumentNullException caught!!!");
   Console.WriteLine("Source : " + e.Source);
   Console.WriteLine("Message : " + e.Message);
}
catch(Exception e)
{
    Console.WriteLine("Exception caught!!!");
    Console.WriteLine("Source : " + e.Source);
    Console.WriteLine("Message : " + e.Message);
}

courtesy of http://www.eggheadcafe.com/community/aspnet/2/83624/system-dns-gethostbyaddre.aspx

More Related Contents:

  1. How do I get the local machine name in C#?
  2. Get IPv4 addresses from Dns.GetHostEntry()
  3. How to get mx records for a dns name with System.Net.DNS? [closed]
  4. Top level domain from URL in C#
  5. Getting the IP address of server in ASP.NET?
  6. How do I clear System.Net client DNS cache?
  7. C# Active Directory: Get domain name of user?
  8. Dns.BeginGetHost… methods blocking
  9. How to provide user name and password when connecting to a network share
  10. Can I convert a C# string value to an escaped string literal?
  11. When to use in vs ref vs out
  12. LINQ to SQL – Left Outer Join with multiple join conditions
  13. AddBusinessDays and GetBusinessDays
  14. Transparency for windows forms textbox
  15. Deserialising JSON to derived types in Asp.Net Web API
  16. Error on if statement – cannot implicitly convert type to ‘bool’
  17. What is quicker, switch on string or elseif on type?
  18. Using reflection in C# to get properties of a nested object
  19. How can a Label control display Japanese characters properly when the Font used doesn’t support this language?
  20. Generic All Controls Method
  21. How do I do a SHA1 File Checksum in C#?
  22. Why does the Linq Cast helper not work with the implicit cast operator?
  23. Is there a RangeAttribute for DateTime?
  24. HttpContext.Current is null when unit test
  25. Custom model binder for a property
  26. How to save DLLs in a different folder when compiling in Visual Studio?
  27. Extracting Windows File Properties (Custom Properties) C#
  28. Write-Only properties, what’s the point? [duplicate]
  29. “An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full”
  30. Sending email through gmail SMTP on GoDaddy [closed]

Leave a Comment