How to find new sub domains created for a domain?

I would like to know if it is possible to detect creation of new sub-domains for a certain domain?

for ex:
let's say there is a domain name called abc.com
I would like to know if a new sub-domain called 123.abc.com is created.
There might be 100s of new sub-domains created, but I would like to be notified each time a new sub-domain is created.

note: we don't own or control the domain.
smuralisankarAsked:
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COBOLdinosaurCommented:
Using that will not help much unless you have links to the subdomain to start from.  If you try to discover the subdomains using it you will probably get flagged as a potential security threat and get blocked.  To do anything of value you will need to ignore robots.txt and most operators with any clue about security will automatically block any robot that does not follow the directives in robots.txt.

Lso the fact that a subdomain exists does not mean it is active.  I have a dozen subdomains on my personal site that I use for testing and that I loan to others needing a temporary location.  I can write a script to create a thousand subdomains that will execute in just a few seconds.

On the server where you are crawling there is no separate root.  subdomains generally are just a directory in the file structure. They could even be a sub-directory of a sub-directory.  

So if you want to waste you time chasing after this go right ahead. For what you are trying to do there is no chance that you will ever be able to rely on the accuracy of the numbers produced by trying to crawl the main site in search of subdomains.

Cd&
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COBOLdinosaurCommented:
Not going to happen.  Sub domains do not require registration, so there is no public store of that information.  All that is required is an entry in the local name server which only the owner has permissions for.  

Cd&
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smuralisankarAuthor Commented:
Is it possible to crawl a domain for sub-domains?

Maybe find out when they were indexed in google?

Maybe someway to set up a google alert for a new subdomain getting indexed?

There has to be some way.
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COBOLdinosaurCommented:
No. No. And no.  

There has to be some way.
Has been the starting point of millions of man-years of disappointment.  Trying to turn straw to gold; controlling the weather; and perpetual motion machines.

With unlimited time, and unlimited resources anything is possible, I will be happy to give unlimited time to explore the possibilities as soon as someone gives me an unlimited source of funding for such a pursuit..

Is there some practical application of this kind of snooping around?

Cd&
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smuralisankarAuthor Commented:
What about this:
http://www.screamingfrog.co.uk/seo-spider/user-guide/configuration/

On the page:

Crawl All Subdomains – By default the SEO spider will only crawl the subdomain you crawl from and treat all other subdomains encountered as external sites. To crawl all subdomains of a root domain, use this option.  

The point is to measure the number of accounts created on a platform.

Thanks
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shalomcCTOCommented:
IF the domain's DNS allow anonymous zone transfers, then the following works:
* start nslookup
* run this:   ls -a abc.com

Alternatively, google for inurl:abc.com  or site:abc.com
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smuralisankarAuthor Commented:
Can we find out when the sub-domains get indexed in google?
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