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What are the restrictions on using glue for reverse domains?

In addition to the usual restrictions for reverse delegations, the following restrictions apply:

  • The domain delegated needs to be a sub-domain of
  • The name server needs to be within the domain delegated.
  • The IP address needs to be a public IPv4 address.
  • You can only specify one IPv4 glue address for each name server.

We are working towards providing support for IPv6 and multiple addresses for each name server.