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To DNS Names in netblock [Reverse DNS]

Modified on: Thu, 18 Jun, 2020 at 4:15 AM

Transform Meta Info

Display NameTo DNS Names in netblock [Reverse DNS]
Transform NameNetblockToDNSName_SS
Short DescriptionThis Transform contacts Robtex ( and asks it for any DNS Names that resolves to IP within this netblock.
Data SourceRobTex


This Transform will speak to Serversniff and Robtex and ask them to give us all reverse DNS records they have for the supplied network.

It gets a bit messy - what happens when you have a class B network? As such the providers have limitations. Robtex wont return reverse DNS entries for networks larger than 2048 IPs (that's 4 class Cs) and Serversniff won't be impressed if you run a block larger than a class B. Keep in mind that you need to adjust your slider accordingly (if your slider is on the first notch and you reverse a class C you'll only get 12 entries back). Also - note that this information comes from a database - so it might not always be up to date. The transform can take a while to run - so be patient. It still beats doing it manually...

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