Changelog for pdns-2.9.21.1-1.el4.rf.x86_64.rpm :

* Fri Sep 12 2008 Dries Verachtert - 2.9.21.1-1 - 6468/dries- Updated to release 2.9.21.1.
* Wed Nov 21 2007 Dag Wieers - 2.9.21-1- Initial package. (using DAR)