Another good source of information is the IQNET. At their site we have several links that may be helpful.
In fact it’s very difficult, almost impossible to get perfect information about this issue.
I’m conducting a world wide study about registered companies in just a specific scope (I even opened a discussion in this part of the Cove about it), and the results are still very poor.
I started using a different “technique” instead of just searching in internet sites. I sent emails for several registrars. The results were much better than I expected!
Although every time I think I have sufficient information about a country I receive an email form another Registrar giving me new registered organizations.
Anyway, in my opinion it’s somehow impossible to have correct and updated information about all the registered organizations anywhere...
Even at a small country like Portugal, where we have more or less 6000 ISO 9001 registered organizations, and 10 Registrars accredited in the Portuguese Quality System, it will be very hard to have all of their names...