diff --git a/extra/dns/cache/rr/rr.factor b/extra/dns/cache/rr/rr.factor
new file mode 100644
index 0000000000..b9c12786e2
--- /dev/null
+++ b/extra/dns/cache/rr/rr.factor
@@ -0,0 +1,68 @@
+
+USING: kernel sequences assocs sets locals combinators
+       accessors system math math.functions unicode.case prettyprint
+       combinators.cleave dns ;
+
+IN: dns.cache.rr
+
+! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+TUPLE: <entry> time data ;
+
+: now ( -- seconds ) millis 1000.0 / round >integer ;
+
+: expired? ( <entry> -- ? ) time>> now <= ;
+
+! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+: make-cache-key ( obj -- key )
+  { [ name>> >lower ] [ type>> unparse ] [ class>> unparse ] } 1arr " " join ;
+
+! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+: cache ( -- table ) H{ } ;
+
+: cache-at     (     obj -- ent ) make-cache-key cache at ;
+: cache-delete (     obj --     ) make-cache-key cache delete-at ;
+: cache-set-at ( ent obj --     ) make-cache-key cache set-at ;
+
+! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+:: cache-get ( OBJ -- rrs/f )
+   [let | ENT [ OBJ cache-at ] |
+     {
+       { [ ENT f =      ] [                  f ] }
+       { [ ENT expired? ] [ OBJ cache-delete f ] }
+       {
+         [ t ]
+         [
+           [let | NAME  [ OBJ name>>       ]
+                  TYPE  [ OBJ type>>       ]
+                  CLASS [ OBJ class>>      ]
+                  TTL   [ now ENT time>> - ] |
+             ENT data>>
+               [| RDATA | T{ rr f NAME TYPE CLASS TTL RDATA } ]
+             map
+           ]
+         ]
+       }
+     }
+     cond
+   ] ;
+
+! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+:: cache-add ( RR -- )
+   [let | ENT   [ RR cache-at    ]
+          TIME  [ RR ttl>> now + ]
+          RDATA [ RR rdata>>     ] |
+     {
+       { [ ENT f =      ] [ T{ <entry> f TIME V{ RDATA } } RR cache-set-at ] }
+       { [ ENT expired? ] [ RR cache-delete RR cache-add                   ] }
+       { [ t            ] [ TIME ENT (>>time) RDATA ENT data>> adjoin      ] }
+     }
+     cond
+   ] ;
+
+! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+