Howto check and isolate problems with DNS servers and Domain records

There are two handy websites online which helps quite extensively in tracking problems with domain name records and DNS incosistencies.
I used them today to learn more about a problem with a non-resolving DNS though it has already a record in a properly configured Bind nameserver possessing a proper PTR record. Here are three handy online DNS checkers:
1. Squish.Net/DNSCheck – contains Tons of useful debugging information related to the possible problem

2. – provides with less information, though still really handy

Some more handy information realted to DNS can be obtained via R. Scott’s DNS Oversimplified

3. TheDNSReport – provides good and extensive info on problems

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