diff --git a/src/main/kotlin/net/thauvin/erik/mobibot/modules/Lookup.kt b/src/main/kotlin/net/thauvin/erik/mobibot/modules/Lookup.kt
index 703f138..83caf6e 100644
--- a/src/main/kotlin/net/thauvin/erik/mobibot/modules/Lookup.kt
+++ b/src/main/kotlin/net/thauvin/erik/mobibot/modules/Lookup.kt
@@ -54,9 +54,8 @@ class Lookup : AbstractModule() {
                 event.respondWith(nslookup(args).prependIndent())
             } catch (ignore: UnknownHostException) {
                 if (args.matches(
-                        ("(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\." +
-                                "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\." +
-                                "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)").toRegex()
+                        ("(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)")
+                            .toRegex()
                     )
                 ) {
                     try {
diff --git a/src/test/kotlin/net/thauvin/erik/mobibot/modules/LookupTest.kt b/src/test/kotlin/net/thauvin/erik/mobibot/modules/LookupTest.kt
index b3e3dff..b0fdfcd 100644
--- a/src/test/kotlin/net/thauvin/erik/mobibot/modules/LookupTest.kt
+++ b/src/test/kotlin/net/thauvin/erik/mobibot/modules/LookupTest.kt
@@ -45,8 +45,11 @@ class LookupTest {
     @Test
     @Throws(Exception::class)
     fun testLookup() {
-        val result = nslookup("apple.com")
+        var result = nslookup("apple.com")
         assertThat(result, "lookup(apple.com)").contains("17.253.144.10")
+
+        result = nslookup("204.122.17.9")
+        assertThat(result, "lookup(204.122.17.9)").contains("nix3.thauvin.us")
     }
 
     @Test