Domain Name Analyzer Professional and Domain Punch Professional supports the quick domain check facility available for AU and NL domains.
Using this feature will allow you to do high speed lookups (wherever supported) without getting banned by the registrar.
To enable this option please do the following in DNA Pro v4 using the "Edit > Data Extraction Settings > Domain Lookup" menu (you should first click on a domain name in the main list)
Please note that some other registrars may also provide similar high speed lookup options. You should be able to configure DNA Pro v4 on your own for such cases.
To enable the same in DNA Pro v3, please do the following.
For AU Domains set the whois server to whois-check.ausregistry.net.au
For NL domains uncheck the Auto gTLD Lookup option in Lookup > Options dialog. DNA Pro v3 will use the "is " parameter when looking up domains with the Auto-gTLD turned off. Please refer to the registrar (www.sidn.nl) web pages for more information.