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 e164.arpa.
- 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.