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Do you have any references for this functionality? I’ve never encountered something like that in the RFCs, or in any server.

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I believe you're referring to DNS zone transfer (https://en.wikipedia.org/wiki/DNS_zone_transfer and https://serverfault.com/questions/890153/how-does-nslookup-l...).

So presumably nslookup -ls had some logic for finding the apex for a particular name, doing an AXFR and then filtering it to the the target name and below?

Yeah, I think it was for zone transfers. It was pretty fun discovering 'private' hosts :-)

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