diff --git a/src/NzbDrone.Core/IndexerVersions/IndexerDefinitionUpdateService.cs b/src/NzbDrone.Core/IndexerVersions/IndexerDefinitionUpdateService.cs
index 4d28cfe45..e7286af7d 100644
--- a/src/NzbDrone.Core/IndexerVersions/IndexerDefinitionUpdateService.cs
+++ b/src/NzbDrone.Core/IndexerVersions/IndexerDefinitionUpdateService.cs
@@ -24,7 +24,7 @@ public interface IIndexerDefinitionUpdateService
     public class IndexerDefinitionUpdateService : IIndexerDefinitionUpdateService, IExecute<IndexerDefinitionUpdateCommand>
     {
         private const int DEFINITION_VERSION = 1;
-        private readonly List<string> _defintionBlacklist = new List<string>() { "animeworld", "blutopia", "beyond-hd", "beyond-hd-oneurl", "hdbits" };
+        private readonly List<string> _defintionBlacklist = new List<string>() { "aither", "animeworld", "blutopia", "beyond-hd", "beyond-hd-oneurl", "hdbits" };
 
         private readonly IHttpClient _httpClient;
         private readonly IAppFolderInfo _appFolderInfo;
diff --git a/src/NzbDrone.Core/Indexers/Definitions/Aither.cs b/src/NzbDrone.Core/Indexers/Definitions/Aither.cs
new file mode 100644
index 000000000..f8fd8f589
--- /dev/null
+++ b/src/NzbDrone.Core/Indexers/Definitions/Aither.cs
@@ -0,0 +1,59 @@
+using System.Collections.Generic;
+using NLog;
+using NzbDrone.Common.Http;
+using NzbDrone.Core.Configuration;
+using NzbDrone.Core.Indexers.Definitions.UNIT3D;
+using NzbDrone.Core.Messaging.Events;
+
+namespace NzbDrone.Core.Indexers.Definitions
+{
+    public class Aither : Unit3dBase
+    {
+        public override string Name => "Aither";
+        public override string BaseUrl => "https://aither.cc/";
+        public override string Description => "Aither is a Private Torrent Tracker for HD MOVIES / TV";
+        public override string Language => "en-us";
+        public override IndexerPrivacy Privacy => IndexerPrivacy.Private;
+
+        public Aither(IHttpClient httpClient, IEventAggregator eventAggregator, IIndexerStatusService indexerStatusService, IConfigService configService, Logger logger)
+            : base(httpClient, eventAggregator, indexerStatusService, configService, logger)
+        {
+        }
+
+        protected override IndexerCapabilities SetCapabilities()
+        {
+            var caps = new IndexerCapabilities
+            {
+                TvSearchParams = new List<TvSearchParam>
+                       {
+                           TvSearchParam.Q, TvSearchParam.Season, TvSearchParam.Ep, TvSearchParam.ImdbId, TvSearchParam.TvdbId
+                       },
+                MovieSearchParams = new List<MovieSearchParam>
+                       {
+                           MovieSearchParam.Q, MovieSearchParam.ImdbId, MovieSearchParam.TmdbId
+                       },
+                MusicSearchParams = new List<MusicSearchParam>
+                       {
+                           MusicSearchParam.Q
+                       },
+                BookSearchParams = new List<BookSearchParam>
+                       {
+                           BookSearchParam.Q
+                       }
+            };
+
+            caps.Categories.AddCategoryMapping(1, NewznabStandardCategory.Movies, "Movie");
+            caps.Categories.AddCategoryMapping(2, NewznabStandardCategory.TV, "TV");
+            caps.Categories.AddCategoryMapping(3, NewznabStandardCategory.Audio, "Music");
+            caps.Categories.AddCategoryMapping(4, NewznabStandardCategory.PCGames, "Games");
+            caps.Categories.AddCategoryMapping(6, NewznabStandardCategory.XXX, "XXX");
+            caps.Categories.AddCategoryMapping(9, NewznabStandardCategory.TVSport, "Sport");
+            caps.Categories.AddCategoryMapping(10, NewznabStandardCategory.PC, "Software/Apps");
+            caps.Categories.AddCategoryMapping(11, NewznabStandardCategory.BooksEBook, "Ebooks/Magazines");
+            caps.Categories.AddCategoryMapping(14, NewznabStandardCategory.AudioAudiobook, "AudioBooks");
+            caps.Categories.AddCategoryMapping(15, NewznabStandardCategory.Other, "Education");
+
+            return caps;
+        }
+    }
+}