On Tue, 9 May 2000, Jarrod MacFarlane wrote:
> Hi sluggers,
>
> Are there any limitations on the number of records for a domain?
Probably implementation specific.
> ie. Could I set up blah000001.domain.com through to blah100000.domain.com?
> (100,000 hosts)
I don't know if _you_ could, but its possible. <grin>
> Had a brief search and look through various RFC's without success.
http://www.faqs.org/rfcs/rfc1035.html
2.3.4. Size limits
Various objects and parameters in the DNS have size limits. They are
listed below. Some could be easily changed, others are morefundamental.
labels 63 octets or less
names 255 octets or less
TTL positive values of a signed 32 bit number.
UDP messages 512 octets or less
So your total domain name must be within 255 characters unless this RFC
has been superseded.
Of course you should also check your resolver but it should follow the
RFCs.
Its just a string, it can have say n^36 combinations where n is the number
of characters and numbers you want to use. You could add a - in there as
well.
> Should there be any limitations would they due to DNS itself or the
> software.. and if it is 'technically' possible would there be any issues?
> (performance?)
Implemntation specific I would think, depends how the code in your
resolver does a lookup. If its a hash it will be quick, if its a search
through a text file it might be slow.
The other problem is the abilty to remember the name, after all, thats why
you use a domain name rather than an IP addresses. Of course then that web
thing came along and HTTP/1.1 ........
Rodos
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