hostname in DNS

[Stefano Arduini]

HP-UX 11.11
NNM 6.41

Thank you in advance for your help.
Which is the maximum length of characters who can be used for a hostname to insert in the DNS?

Best regards
Stefano

[Mobeen_1]

Stefano,
Could you tell me which DNS server are you guys using?

regards
Mobeen

[Mobeen_1]

Stefano,
The maximum length of characters allowed in a DNS implementation could be customised. It depends on the configuration on your name server.

I am not sure what name server you are using. If you are having your nameserver on Unix and running BIND, i suggest that you review the links below

http://www.dns.net/dnsrd/docs/

This site contains links to a lot of other interesting stuff.

If you don't have access to your DNS server and are not able to look through the config to determine what the maximum name length on your DNS server is, then i suggest you simply pose this question to your DNS administrator.

Hope this information helps

regards
Mobeen

[G. Vrijhoeven]

Hi Stefano,

You need to keep in mind the hostname length limit of HPUX:
It is defined in /usr/include/sys/param.h:

#define MAXHOSTNAMELEN 64 /* max length of hostname */

I would not advice you to alter this!

HTH,

Gideon

[Geoff Wild]

DNS names must conform to the DNS standard defined by RFC 1123.

The DNS defines domain name syntax very generally -- a string of labels each containing up to 63 8-bit octets,
separated by dots, and with a maximum total of 255 octets. Particular applications of the DNS are permitted to further constrain the syntax of the domain names they use, although the DNS deployment has led to
some applications allowing more general names. In particular, Section 2.1 of this document liberalizes slightly the syntax of a legal Internet host name that was defined in RFC-952 [DNS:4].


For Active Directory:

The maximum length of a DNS name is 255 UTF-8 bytes, but the locator attached various prefixes (domain GUIDs, site names, and so on) to the records entered in DNS, making the longest possible fully qualified Active Directory domain name 155 UTF-8 bytes long.

Rgds...Geoff