diff --git a/FastGithub.Scanner/GithubScanResults.cs b/FastGithub.Scanner/GithubScanResults.cs
index f274003..32f7771 100644
--- a/FastGithub.Scanner/GithubScanResults.cs
+++ b/FastGithub.Scanner/GithubScanResults.cs
@@ -1,4 +1,5 @@
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Options;
 using System.Collections.Generic;
 using System.Linq;
 using System.Net;
@@ -13,6 +14,12 @@ namespace FastGithub.Scanner
     {
         private readonly object syncRoot = new();
         private readonly List<GithubContext> contexts = new();
+        private readonly IOptionsMonitor<GithubLookupFactoryOptions> options;
+
+        public GithubScanResults(IOptionsMonitor<GithubLookupFactoryOptions> options)
+        {
+            this.options = options;
+        }
 
         /// <summary>
         /// 添加GithubContext
@@ -51,6 +58,11 @@ namespace FastGithub.Scanner
         /// <returns></returns>
         public IPAddress? FindBestAddress(string domain)
         {
+            if (this.options.CurrentValue.Domains.Contains(domain) == false)
+            {
+                return default;
+            }
+
             lock (this.syncRoot)
             {
                 return this.contexts