There are 2 hosts: devel.a.xxx.com devel.b.xxx.com the actual host names are "devel.a" and "devel.b". when you resolve "devel.a" to an IP, "devel.b" doesn't resolve. Then I log onto the "recursive resolver" and rndc flush, then i can resolve "devel.b" but "devel.a" doesnt resolve untill i do rndc flush again. Whats going on? Petr