Some useful diagnostic tools
- Squishywishywoo: complete dns traversal checking
- "DNSCheck is a program that was designed to help people check, measure and hopefully also understand the workings of the Domain Name System"
- "The ZoneCheck program (freely available here for download) performs several tests on your zone (ie: domain) to ensure that it is correctly configured and can be safely delegated, providing a certain quality to your domain"
- Verisign DNSSEC Analyser