diff --git a/respodns/ui.py b/respodns/ui.py
index 7651f86..8b1cf73 100644
--- a/respodns/ui.py
+++ b/respodns/ui.py
@@ -19,9 +19,13 @@ def ui(program, args):
     desc = "enable pretty-printing progress to stderr"
     parser.add_argument("--progress", action="store_true", help=desc)
 
+    desc = "enable all checks instead of only the most likely ones"
+    parser.add_argument("--all", action="store_true", help=desc)
+
     a = parser.parse_args(args)
 
-    checks = chk.first + chk.likely
+    checks = [] + chk.first
+    checks += chk.checks if a.all else chk.likely
 
     opts = Options()
     opts.dry = a.database is None