query
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... This size estimate is extremely crude, but shouldn't underestimate
the actual answer size by much. If an answer may be close to the
limit, using a DNS query tool (e.g. "dig") to look at the actual
answer is a good idea.
...
... If a truncated response comes back from an SRV query, the rules
described in [RFC 2181] shall apply.
...
... 30 bytes general overhead
20 bytes for the query string, "_foobar._tcp.example.com."
130 bytes for 4 SRV RR's, 20 bytes each plus the lengths of "new-
...
... SRV RR's, 20 bytes each plus the lengths of "new-
fast-box", "old-slow-box", "server" and "sysadmins-box" -
"example.com" in the query section is quoted here and doesn't
need to be counted again.
75 bytes for 3 NS ...