It seems like all domains are down now, e.g.
$ dig -t ns v6.rocks @8.8.8.8
; <<>> DiG 9.20.15-1~deb13u1-Debian <<>> -t ns v6.rocks @8.8.8.8
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 55359
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;v6.rocks. IN NS
;; Query time: 20 msec
;; SERVER: 8.8.8.8#53(8.8.8.8) (UDP)
;; WHEN: Tue May 05 15:40:41 CEST 2026
;; MSG SIZE rcvd: 37
It seems like all domains are down now, e.g.