[bitfolk] Check yo PTRs

Hello, The other day I saw one of BitFolk's IP addresses in a log file and wondered which host that was, so I did a reverse lookup and got: 2001-ba8-1f1-f284-0-0-0-2.autov6rev.bitfolk.space which was useless to me. It's quick to look this up and fix it of course, but I wondered how many other such addresses I had forgotten to take care of the reverse DNS for. In order to answer that question, automatically and in bulk, I wrote this tool: https://github.com/grifferz/ptrcheck-rs The answer, for bitfolk.com, was 1 A record and 4 AAAA records. I ran it against every customer domain on BitFolk's secondary service and found that 20.1% of customers domains contain host records with no PTR. When I added: --badre 'autov6rev' to catch unset BitFolk IPv6 reverse DNS, that percentage went up to 26.5% of customer zones. This is not a shaming. 😀 All but one of my own zones had at least one broken/missing PTR. I will make a few more improvements and then turn it into a Nagios check plugin available on request. Thanks, Andy -- https://bitfolk.com/ -- No-nonsense VPS hosting