diff --git a/services/Directory/FilterLists.Directory.Application/Commands/CreateList.cs b/services/Directory/FilterLists.Directory.Application/Commands/CreateList.cs
index ecbe86f0b..ed2dfcc3e 100644
--- a/services/Directory/FilterLists.Directory.Application/Commands/CreateList.cs
+++ b/services/Directory/FilterLists.Directory.Application/Commands/CreateList.cs
@@ -182,11 +182,30 @@ public record FilterListViewUrl
 
     internal class Validator : AbstractValidator<Command>
     {
-        public Validator()
+        public Validator(IValidator<Uri?> urlValidator)
         {
             RuleFor(c => c.LicenseId)
                 .GreaterThan(0)
                 .When(c => c.LicenseId != null);
+            RuleForEach(c => c.ViewUrls.Select(u => u.Url))
+                .SetValidator(urlValidator)
+                .OverridePropertyName(nameof(Command.ViewUrls));
+            RuleFor(c => c.HomeUrl)
+                .SetValidator(urlValidator);
+            RuleFor(c => c.OnionUrl)
+                .SetValidator(urlValidator);
+            RuleFor(c => c.PolicyUrl)
+                .SetValidator(urlValidator);
+            RuleFor(c => c.SubmissionUrl)
+                .SetValidator(urlValidator);
+            RuleFor(c => c.IssuesUrl)
+                .SetValidator(urlValidator);
+            RuleFor(c => c.ForumUrl)
+                .SetValidator(urlValidator);
+            RuleFor(c => c.ChatUrl)
+                .SetValidator(urlValidator);
+            RuleFor(c => c.DonateUrl)
+                .SetValidator(urlValidator);
         }
     }
 
diff --git a/services/Directory/FilterLists.Directory.Application/ConfigurationExtensions.cs b/services/Directory/FilterLists.Directory.Application/ConfigurationExtensions.cs
index e8e5e8b03..e6afd2d00 100644
--- a/services/Directory/FilterLists.Directory.Application/ConfigurationExtensions.cs
+++ b/services/Directory/FilterLists.Directory.Application/ConfigurationExtensions.cs
@@ -1,4 +1,5 @@
-using FilterLists.Directory.Infrastructure;
+using FilterLists.Directory.Application.Validators;
+using FilterLists.Directory.Infrastructure;
 using FluentValidation;
 using MediatR;
 using Microsoft.AspNetCore.Builder;
@@ -17,11 +18,12 @@ public static IHostBuilder ConfigureApplication(this IHostBuilder hostBuilder)
 
     public static void AddApplication(this IServiceCollection services, IConfiguration configuration)
     {
-        services.AddMediatR(typeof(ConfigurationExtensions).Assembly);
-        services.AddTransient(typeof(IPipelineBehavior<,>), typeof(ValidatorPipelineBehavior<,>));
+        services.AddInfrastructure(configuration);
+        services.AddHttpClient();
         services.AddValidatorsFromAssembly(typeof(ConfigurationExtensions).Assembly, includeInternalTypes: true);
         services.AddAutoMapper(typeof(ConfigurationExtensions).Assembly);
-        services.AddInfrastructure(configuration);
+        services.AddMediatR(typeof(ConfigurationExtensions).Assembly);
+        services.AddTransient(typeof(IPipelineBehavior<,>), typeof(ValidatorPipelineBehavior<,>));
     }
 
     public static void UseApplication(this IApplicationBuilder app)
diff --git a/services/Directory/FilterLists.Directory.Application/Validators/UrlValidator.cs b/services/Directory/FilterLists.Directory.Application/Validators/UrlValidator.cs
new file mode 100644
index 000000000..8fb077b55
--- /dev/null
+++ b/services/Directory/FilterLists.Directory.Application/Validators/UrlValidator.cs
@@ -0,0 +1,38 @@
+using FluentValidation;
+
+namespace FilterLists.Directory.Application.Validators;
+
+internal class UriValidator : AbstractValidator<Uri?>
+{
+    public UriValidator(IHttpClientFactory httpClientFactory)
+    {
+        RuleFor(u => u)
+            .Cascade(CascadeMode.Stop)
+            .Must(u => Uri.TryCreate(u?.OriginalString, UriKind.Absolute, out _))
+            .WithMessage(u => $"Malformed absolute URL {u?.OriginalString}.")
+            .CustomAsync(
+                async (u, context, token) =>
+                {
+                    var response = default(HttpResponseMessage?);
+                    try
+                    {
+                        response = await httpClientFactory.CreateClient()
+                            .GetAsync(u, HttpCompletionOption.ResponseHeadersRead, token);
+                    }
+                    catch (HttpRequestException ex)
+                    {
+                        context.AddFailure($"Error accessing URL {u?.OriginalString}. {ex.Message}");
+                    }
+                    catch (InvalidOperationException ex)
+                    {
+                        context.AddFailure($"Error accessing URL {u?.OriginalString}. {ex.Message}");
+                    }
+
+                    if (response?.IsSuccessStatusCode != true)
+                    {
+                        context.AddFailure($"Error accessing URL {u?.OriginalString}. {response?.StatusCode}");
+                    }
+                })
+            .When(u => u is not null);
+    }
+}
diff --git a/services/Directory/FilterLists.Directory.Application/ValidatorPipelineBahavior.cs b/services/Directory/FilterLists.Directory.Application/Validators/ValidatorPipelineBehavior.cs
similarity index 92%
rename from services/Directory/FilterLists.Directory.Application/ValidatorPipelineBahavior.cs
rename to services/Directory/FilterLists.Directory.Application/Validators/ValidatorPipelineBehavior.cs
index 74a3bccae..d58fcada0 100644
--- a/services/Directory/FilterLists.Directory.Application/ValidatorPipelineBahavior.cs
+++ b/services/Directory/FilterLists.Directory.Application/Validators/ValidatorPipelineBehavior.cs
@@ -1,7 +1,7 @@
 using FluentValidation;
 using MediatR;
 
-namespace FilterLists.Directory.Application;
+namespace FilterLists.Directory.Application.Validators;
 
 internal class ValidatorPipelineBehavior<TRequest, TResponse> : IPipelineBehavior<TRequest, TResponse>
     where TRequest : notnull