Nslookup and fully qualified name

M Alan C my00sc00by at yahoo.com
Sat Jan 24 13:03:03 UTC 2004

Even if RFC 1123 says it can be done, that does not mean that Bind does it.  I know that if I do a hostname that is all numbers it refers to the in-addr.arpa file.  If I give it the fqdn, then it resolves using the forward file.
phn at icke-reklam.ipsec.nu wrote:
Stephane Bortzmeyer wrote:
> On Fri, Jan 23, 2004 at 06:34:15PM +0000,
> phn at icke-reklam.ipsec.nu 
> a message of 31 lines which said:

>> The format of the domain name, it's illegal 

> As a domain name, it is certainly LEGAL. As an host name, it WAS
> illegal but it is no longer.

>> See rfc1123 for details 

> On the contrary, RFC 1123 was the one which authorized all-digits
> names (before RFC 1123, you needed an initial letter).

> Read it: 2.1 "Host Names and Numbers", p.13

OK, i'll quote :
"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 liberal
And a littee later :
"If a dotted-decimal number can be entered without such
identifying delimiters, then a full syntactic check must be
made, because a segment of a host domain name is now allowed
to begin with a digit and could legally be entirely numeric
(see Section However, a valid host name can never
have the dotted-decimal form #.#.#.#, since at least the
highest-level component label will be alphabetic."

I stand corrected.

I do however insist on the hazards involved with using all-numeric
host-names, they will trigger software anomalies everywhere.

Peter Håkanson 
IPSec Sverige ( At Gothenburg Riverside )
Sorry about my e-mail address, but i'm trying to keep spam out,
remove "icke-reklam" if you feel for mailing me. Thanx.

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