[tor-talk] What is "a.onion"?

[Gisle Vanem]

Trying the C-ares [1] program adig on some .onion addresses
on my local Tor/Windows, I get responses like (short output):

c:\>  adig -t A a.onion
Answers:
         a.onion        .        60      A       127.247.163.198

Or c:\> adig -t A b.onion
Answers:
         b.onion        .        60      A       127.207.1.12

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What are these 127.a.b.c.d addresses and their relations to
'a' and 'b'?

[1] https://github.com/c-ares/c-ares/

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--gv