If you have multiple DNS servers, one of your biggest concerns is probably the propagation of changes across your pool of servers.  Once you make a change, add a record or remove a record is that record getting updated on all your servers?  Are you serving up the same records or is one server out of sync?   Are your registrar’s servers syncing your changes?

MxToolbox’s DNS Propagation tool, available in Classic and Professional interfaces

MxToolbox is happy to announce our new DNS Propagation tool.  Our tool checks all of your DNS servers simultaneously when you lookup a record, compares the Start of Authority record to all servers and highlights the server(s) that are different.  In one lookup, you can view the propagation of your records across your entire DNS pool.

A well-timed search for Google.com’s A record shows them in the process of propagation across servers.