PreshBlog

DNS Propagation Checker

by on Mar.12, 2007, under Linux, System Administration

Ever wanted to check the result of a DNS lookup from various DNS servers, perhaps to see how far a recent DNS change has propagated – which servers are giving the new answer, and which still have the old answer cached?

I recently wrote a little Perl script to do just that. My DNS Propagation Checker will query a set of 10 servers at random and show you the results. (Be warned, it may be a little slow at times, because (a) it has to wait for the DNS servers (I might re-write it one day to do the requests concurrently) and (b) my poor little virtual server is a little slow and overloaded right now.

It’s Open Source software available under the GPL licence, but I haven’t tidied the code up and released it yet.  If you would like a copy let me know – if there’s any interest, I’ll release it.

Do let me know if you find this tool useful :)


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