what's a valid domain name?
jw354 at cornell.edu
Fri Feb 4 16:35:42 UTC 2011
To add to the story, I added a rule to our DNS administration
system that we'll only allow hostnames that include
at least one alphabetic.
On Feb 4, 2011, at 11:26 AM, John Wobus wrote:
> So 10.14.22.11 is a legal hostname, right?
> We had a recent experience where our DNS administration
> system allowed someone to insert in a CNAME record that
> resembled this:
> www.example.com. CNAME 10.14.22.11.
> A fascinating thing about this is that my computer/browser could
> take me to www.example.com just fine.
> John Wobus
> On Jan 30, 2011, at 7:30 AM, pyh at mail.nsbeta.info wrote:
>> From RFC 1123
>> One aspect of host name syntax is hereby changed: the
>> restriction on the first character is relaxed to allow either a
>> letter or a digit. Host software MUST support this more
>> pyh at mail.nsbeta.info writes:
>>> Joseph S D Yao writes:
>>>> The labels must follow the rules for ARPANET host names. They must
>>>> start with a letter, end with a letter or digit, and have as
>>>> characters only letters, digits, and hyphen. There are also some
>>>> restrictions on the length. Labels must be 63 characters or less.
>>> A label must start with a letter? oh I don't think so.
>>> How about these domains which all have huge DNS traffic?
>>> yes 163.com is a domain name but "163" also can be treated as a
>>> label for
>>> domain "com.", is it?
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>>> bind-users at lists.isc.org
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