At work, Mobistar delegated our reverse DNS to a zone with a slash in it. I didn’t even know this was legal in DNS but apparently it is, and BIND and PowerDNS serve it perfectly. I installed PowerAdmin to manage my PowerDNS records with a GUI (MySQL INSERT/UPDATE was becoming a bit tedious), but could not create a domain nor any entries below it (after creating the domain through MySQL), because it wouldn’t accept the / as a valid character. I cooked up a small patch (don’t know if it’s complete, I just know it works for me) which you can find here .

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