In article <20201215174646.GA970751@jurassic.vpn.malgudi.org> you write:
You or someone else who owns crocker.com appears to have created these nameserver objects (these are not a part of DNS, except that they may show up as glue) in the registry:
Right. When I query the .COM zone servers, they say quite clearly that there is no crocker.com glue in the .COM zone. See below. The registry nameserver objects are fine. They let his users register domains that use his nameservers. I think that without some clearer indication that something is wrong we can close this issue. R's, John $ dig @g.gtld-servers.net. dns-auth3.crocker.com a ; <<>> DiG 9.10.6 <<>> @g.gtld-servers.net. dns-auth3.crocker.com a ; (2 servers found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 31790 ;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 4, ADDITIONAL: 2 ;; WARNING: recursion requested but not available ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;dns-auth3.crocker.com. IN A ;; AUTHORITY SECTION: crocker.com. 172800 IN NS ns-8.awsdns-01.com. crocker.com. 172800 IN NS ns-1005.awsdns-61.net. crocker.com. 172800 IN NS ns-1775.awsdns-29.co.uk. crocker.com. 172800 IN NS ns-1317.awsdns-36.org. ;; ADDITIONAL SECTION: ns-8.awsdns-01.com. 172800 IN A 205.251.192.8 ;; Query time: 74 msec ;; SERVER: 2001:503:eea3::30#53(2001:503:eea3::30) ;; WHEN: Tue Dec 15 18:35:38 EST 2020 ;; MSG SIZE rcvd: 202