MSDN Library

Property Value

The PublicSuffix property returns a string representing the public suffix of the certificate's domain name. If the domain name is not found in the Public Suffix List or if it's an IP address, an empty string is returned.

Syntax

public string PublicSuffix { get; }
            

Remarks

This property is particularly useful when dealing with wildcard certificates or when you need to identify the top-level domain of a host for security or policy enforcement.

For example, if a certificate is issued for *.example.co.uk, the PublicSuffix property would return co.uk. If the certificate is for www.google.com, it would return com.

Example

The following C# code example demonstrates how to retrieve the public suffix from an X509Certificate2 object.

using System;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;

public class Example
{
    public static void Main( string[] args )
    {
        // Assume 'certificate' is an X509Certificate2 object loaded from a file or store
        X509Certificate2 certificate = new X509Certificate2( "path/to/your/certificate.cer" );

        string publicSuffix = certificate.PublicSuffix;

        if (!string.IsNullOrEmpty(publicSuffix))
        {
            Console.WriteLine( "Public Suffix: " + publicSuffix );
        }
        else
        {
            Console.WriteLine( "Could not determine a public suffix for this certificate." );
        }
    }
}