How do we know that as these searches are executed that the domain names don't become unavailable, because someone parks on them? That historically has been the problem with domain-name searches. I'd like an absolute guarantee that the searching is done in a manner that doesn't alert registrars or their cronies to new domain names to park on before running many searches here. The application is a text-searching appli…
For speed purposes they should be FIRST running this check on yesterday's zone files from each registry (Verisign for .com/net for example). If that fails (shows in the zone file) no need to go further.
After that check if a name does show as available you do a whois against the appropriate registry NOT a REGISTRAR (because there is no reason to do that).
As step 1 if you don't have access to the zone file you can do a nslookup to see if the domain resolves. If it doesn't you can then check the registry (by the way PIR (.org) rate limits checks unless you are white listed).
Theoretically if a registrar has access to zegup they could front run domains IF the user of zegup indicated which domains they were interested in. Otherwise to many names to be of value in front running the way I see the site operating.
Of course there is nothing to prevent a registrar from putting up a man in the middle site (like zegup) hosted elsewhere and grabbing domains and doing what you are saying. So there is no way to "guarantee" what you are asking other than the reputation of the person running the "zegup" type site.
As an aside zegup.com was registered recently and has domain privacy. So even though whois can be faked privacy info when you are runnning a business is a bad idea.
Domain Name: ZEGUP.COM
Registrant: PrivacyProtect.org Domain Admin (contact@privacyprotect.org) ID#10760, PO Box 16 Note - All Postal Mails Rejected, visit Privacyprotect.org Nobby Beach null,QLD 4218 AU Tel. +45.36946676
Creation Date: 09-Feb-2012 Expiration Date: 09-Feb-2013