diff --git a/EchoServiceApi/Controllers/DiagnosticsController.cs b/EchoServiceApi/Controllers/DiagnosticsController.cs
index 43109e4..77bf3fb 100644
--- a/EchoServiceApi/Controllers/DiagnosticsController.cs
+++ b/EchoServiceApi/Controllers/DiagnosticsController.cs
@@ -4,6 +4,7 @@
 namespace EchoServiceApi.Controllers
 {
     [Route("[controller]/[action]")]
+    [Route("diag/[action]")]
     public class DiagnosticsController : ControllerBase
     {
         public IActionResult GetInfo([FromServices] NetLah.Diagnostics.IAssemblyInfo appInfo)
@@ -194,5 +195,18 @@ public async Task<IActionResult> CertificateAsync([FromServices] CertificateVeri
                 return Ok(VerifyResult.Failed(ex));
             }
         }
+
+        public async Task<IActionResult> DnsHostEntryAsync([FromServices] DnsHostEntryVerifier dnsHostEntryVerifier, string? host)
+        {
+            try
+            {
+                var result = await dnsHostEntryVerifier.VerifyAsync(host);
+                return Ok(result);
+            }
+            catch (Exception ex)
+            {
+                return Ok(VerifyResult.Failed(ex));
+            }
+        }
     }
 }
diff --git a/EchoServiceApi/Program.cs b/EchoServiceApi/Program.cs
index 5cff1e5..b5e2531 100644
--- a/EchoServiceApi/Program.cs
+++ b/EchoServiceApi/Program.cs
@@ -49,6 +49,7 @@
     builder.Services.AddScoped<DirVerifier>();
     builder.Services.AddScoped<ServiceBusVerifier>();
     builder.Services.AddScoped<CertificateVerifier>();
+    builder.Services.AddScoped<DnsHostEntryVerifier>();
     builder.Services.AddHttpClient<HttpVerifier>();
 
     builder.Services.AddHttpContextAccessor();
diff --git a/EchoServiceApi/Verifiers/DnsHostEntryVerifier.cs b/EchoServiceApi/Verifiers/DnsHostEntryVerifier.cs
new file mode 100644
index 0000000..ea7d8c8
--- /dev/null
+++ b/EchoServiceApi/Verifiers/DnsHostEntryVerifier.cs
@@ -0,0 +1,31 @@
+using System.Net;
+
+namespace EchoServiceApi.Verifiers
+{
+    public class DnsHostEntryVerifier : BaseVerifier
+    {
+        public DnsHostEntryVerifier(IServiceProvider serviceProvider) : base(serviceProvider) { }
+
+        public Task<VerifyResult> VerifyAsync(string? host)
+        {
+            host = string.IsNullOrWhiteSpace(host) ? string.Empty : host.Trim();
+
+            Logger.LogInformation("DnsHostEntryVerifier: host={host}", host);
+
+            var ipHostEntry = Dns.GetHostEntry(host);
+            var addressList = ipHostEntry.AddressList?.Select(ip => ip.ToString()).ToArray();
+            var result = new
+            {
+                AddressList = addressList,
+                ipHostEntry.HostName,
+                ipHostEntry.Aliases,
+            };
+
+            return Task.FromResult<VerifyResult>(new VerifySuccess<object>
+            {
+                Message = $"DNS Lookup {host}",
+                Value = result
+            });
+        }
+    }
+}