RFC 1033 in the `` INSTRUCTIONS '' section , and later , RFC 1912 Section 2.1 states `` Every Internet-reachable host should have a name '' and `` Make sure your PTR and A records match '' . Internet official documents ( RFC 1033 , RFC 1912 Section 2.1 ) specify that `` Every Internet-reachable host should have a name '' and that such names match with a reverse pointer record .