multiple dns queries

[Guy Pazi]

Hi,

By trying to improve efficiency of my dns system I'm trying to query
multiple dns queries. I.e. sending more then one question in a dns
request.
I've found contradicting documents specifying only one question is
allowed per query, while others specify otherwise.
The structure of a dns query suggest multiple questions are allowed (the
field "QDCOUNT" - number of questions) but I couldn't find any example
of such query.
When (if any) can a multiple question query be generated?

Thanks
Guy