Ben Croswell writes:
In that case technically you are creating undelegated subdomains for each
router.
The dot is a delimiter and can't be part of a hostname.

I was thinking you are wrong.
Period is somewhat permitted in a hostname. From RFC 952
      A "name" (Net, Host, Gateway, or Domain name) is a text string up
      to 24 characters drawn from the alphabet (A-Z), digits (0-9), minus
      sign (-), and period (.).  Note that periods are only allowed when
they serve to delimit components of "domain style names".
      No blank or space characters are permitted as part of a
      name. No distinction is made between upper and lower case.  The first
character must be an alpha character [Relaxed in RFC 1123] . The last character must not be a minus sign or period.

regrads.
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