As per the Deadwood man page, record types beterrn 65392 (0xff70) and 
65407 (0xff7f) are reserved for Deadwood internal use.

65392 was used to indicate an upstream dns server entry in the cache (but
	not any longer; we can use this again if we ever need to)

65393 indicates an error when we ask for a rr type

65394 (0xff72) is used for CNAME referrals

65395 (0xff73) is used for NS referrals

