IP address allocation

[Terry <tech () futurecourse com>]

Hi,

I've googled but haven't really come across anything that answers my
questions.  Is it common practice for ISPs to allocate a block of
addresses to a customer and put in DNS records for ones that are
unused?

For example, xxx.8-xxx.15 is assigned to the customer.  Customer uses
xxx.9 for the router and xxx.10 for web server.  xxx.11-14 are unused.
I would expect to see DNS records for xxx.9 and xxx.10 but not for the
rest of the block.  Am I wrong?  If there are DNS records for the rest
of the IPs, why is that?  Is there some security reason for doing
this?

-- 
Regards,
Terry


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