Hi! Does anyone know if there is any imperative (writen or oral) to avoid registering 2 letter second level domains? I know some top level domains refuse to do so based on possible conflicts (due to user misconfigurations) with current or future top level domains, but others allow it. We have a request to register one of these under "es" and I want some advice before saying "yes" or "no". Thanks, Miguel +---------------------------------------------------------------+ | Miguel A. Sanz Tel: + 34 1 5855152 | | RedIRIS/CSIC Fax: + 34 1 5855146 | | Serrano 142 Email: miguel.sanz@rediris.es | | 28006 Madrid | +---------------------------------------------------------------+
Miguel A. Sanz wrote:
Hi!
Does anyone know if there is any imperative (writen or oral) to avoid registering 2 letter second level domains?
No, there isn't. There are lot of 2 letter second level domains under almost all TDL, e.g. es.net bt.com <2-letter-US-state-code>.us uc.edu co.uk ac.uk co.at ac.at .... In Germany we are just considering to install 2-letter-state-codes as second level domains to cope with the steady increase of domains.
I know some top level domains refuse to do so based on possible conflicts (due to user misconfigurations) with current or future top level domains, but others allow it.
We have a request to register one of these under "es" and I want some advice before saying "yes" or "no".
Thanks,
Miguel
+---------------------------------------------------------------+ | Miguel A. Sanz Tel: + 34 1 5855152 | | RedIRIS/CSIC Fax: + 34 1 5855146 | | Serrano 142 Email: miguel.sanz@rediris.es | | 28006 Madrid | +---------------------------------------------------------------+
Regards, Arnold -- Arnold Nipper / email: nipper@xlink.net NTG Netzwerk und Telematic GmbH \/ phone: +49 721 9652 0 Geschaeftsbereich XLINK /\ LINK fax: +49 721 9652 210 Vincenz-Priessnitz-Str. 3 /_______ D-76131 Karlsruhe, Germany
Arnold Nipper <nipper@xlink.net> writes: Miguel A. Sanz wrote:
Hi!
Does anyone know if there is any imperative (writen or oral) to avoid registering 2 letter second level domains?
No, there isn't. There are lot of 2 letter second level domains under almos t all TDL, e.g.
The problem with two letter domains in general is the ambiguity of abbreviated domain names. In principle you can always abbreviate domain names by omitting common higher levels. if you are inside a two letter domain which also exists as a toplevel domain this is ambiguous. Example: If you are inside ac.uk foobar.co can mean foobar.co.uk in the UK or foobar.co in Columbia Mostly this conflict is resolved in favour of the toplevel domain but the ambiguity exists. That's why it is advisable not to use two letter domains anywhere and also to avoid com edu mil etc. Since avoiding this is not hard it is advisable, in my opinion. Why not just use three letter state codes? A possible problem avoided at no cost. Daniel
Does anyone know if there is any imperative (writen or oral) to avoid registering 2 letter second level domains? I know some top level domains refuse to do so based on possible conflicts (due to user misconfigurations) with current or future top level domains, but others allow it. We have a request to register one of these under "es" and I want some advice before saying "yes" or "no". Forbidding to register 2-letter subdomains is pretty hard, but people should *strongly* be advised *not* to register 2-letter subdomains. Practice has shown that people overlook or don't know what RFC822 states in par. 6.2.2, and in their ignorance allow abbreviated addressing. I've seen *LOTS* of mails meant to stay within a CS department, being routed to [the former] Czecho-Slovakia, because there is no way to distinguish between an internal address user@foo.cs (where the FQDN is foo.cs.xxx) and an external address user@foo.cs in Czecho-Slovakia. In your case I'd say registering a domain es.es is almost a guarantee for troubles. Piet
participants (4)
-
Arnold Nipper -
Daniel Karrenberg -
Miguel A. Sanz -
Piet Beertema