diff --git a/evdns.c b/evdns.c
index 66a3bff3..04362a32 100644
--- a/evdns.c
+++ b/evdns.c
@@ -4044,6 +4044,19 @@ evdns_base_free(struct evdns_base *base, int fail_requests)
 	evdns_base_free_and_unlock(base, fail_requests);
 }
 
+void
+evdns_base_flush_outdated_host_addresses(struct evdns_base *base)
+{
+   	EVDNS_LOCK(base);
+   	struct hosts_entry *victim;
+   	while ((victim = TAILQ_FIRST(&base->hostsdb))) {
+   	TAILQ_REMOVE(&base->hostsdb, victim, next);
+        mm_free(victim);
+   	}
+   	EVDNS_UNLOCK(base);
+   	EVTHREAD_FREE_LOCK(base->lock, EVTHREAD_LOCKTYPE_RECURSIVE);
+}
+
 void
 evdns_shutdown(int fail_requests)
 {
diff --git a/include/event2/dns.h b/include/event2/dns.h
index edd2a23e..b7ca0937 100644
--- a/include/event2/dns.h
+++ b/include/event2/dns.h
@@ -237,6 +237,12 @@ struct evdns_base * evdns_base_new(struct event_base *event_base, int initialize
  */
 void evdns_base_free(struct evdns_base *base, int fail_requests);
 
+/**  
+  All previous outdated host addresses will be removed or flushed from the event base.  
+  @param evdns_base the evdns base to flush outdated host addresses
+*/
+void evdns_base_flush_outdated_host_addresses(struct evdns_base *base);
+
 /**
   Convert a DNS error code to a string.