I've got what appears to be some end-user devices sending _ta-4a5c
queries. I'm tracking them down with:

        tcpdump -s0 -n -p -i any -vvv -X dst port 53 and \
                \( ip[0x28:4] == 0x085f7461 or ip6[0x3c:4] == 0x085f7461 \)

This expression looks for DNS query names that start with an 8 character
label beginning '_ta'. I thought this might be useful for others.

Tony.
--
f.anthony.n.finch  <dot@dotat.at>  http://dotat.at/
Dover, Wight, Portland, Plymouth: West or southwest 3 or 4, increasing 5 or 6.
Slight or moderate. Showers later. Moderate or good.
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