Skip to Content.
Sympa Menu

discuss - [opennic-discuss] Example domains and localhost entrys

discuss AT

Subject: Discuss mailing list

List archive

[opennic-discuss] Example domains and localhost entrys

Chronological Thread 
  • From: Philipp Schafft <lion AT>
  • To: OpenNIC Discuss <discuss AT>
  • Subject: [opennic-discuss] Example domains and localhost entrys
  • Date: Tue, 26 Apr 2011 23:07:11 +0200
  • List-archive: <>
  • List-id: <>
  • Organization: PH2


My dnschecker script (if you want DNS status mails just ask!) informed
me that several OpenNIC domains/TLDs do not have example domains and
localhost entrys. This is not a error but something I would like to have

Example domains:
RFC 2606 stats in "3. Reserved Example Second Level Domain Names" the

> 3. Reserved Example Second Level Domain Names
> The Internet Assigned Numbers Authority (IANA) also currently has the
> following second level domain names reserved which can be used as
> examples.

I used to have those for .fur and .vpn (not OpenNIC relevant) (See

I consider it to be kind and handy to have them reserved.
What do you think?

Another thing is defining a localhost entry at domain/TLD level:
I have seen problems more than once when a localhost entry for a domain
was not defined.
The entry should be 'localhost IN A'.
Some (bad) clients try to resolve 'localhost' via DNS only (not NIS) and
will not find the local host system's host database (/etc/hosts)'s
entry. They continue to search for it using DNS search domain list and
stuff. They may hit some entry and this one may be a bad one (_very_
dangerous with wildcard entrys. This is one of the things why wildcard
DNS records should be avoided.).
You have a server search list is foo.tld. You have a
wildcard entry pointing to the server (so you do not need to add www.,
ftp., blubb.). Now you bind a services to 'localhost'. This will result
in binding to '' AKA (wildcard entry)
pointing to your external IP and make a internal services public. As the
client is likly to do the same it will 'work' and you may not notice the
problem early.

So I recommend to add the localhost entry.

What do you think?

(Rah of PH2)

Attachment: signature.asc
Description: This is a digitally signed message part

Archive powered by MHonArc 2.6.19.

Top of Page