D'ici (Free, région parisienne), je constate le même problème en IPv4, ça fonctionne en IPv6.
$ dig -x 185.222.222.222
; <<>> DiG 9.18.30 <<>> -x 185.222.222.222
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 45009
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;222.222.222.185.in-addr.arpa. IN PTR
;; ANSWER SECTION:
222.222.222.185.in-addr.arpa. 3254 IN PTR public-dns-a.dns.sb.
;; Query time: 1 msec
;; SERVER: 127.0.0.53#53(127.0.0.53) (UDP)
;; WHEN: Mon Nov 25 15:50:58 CET 2024
;; MSG SIZE rcvd: 90
$ dig @public-dns-a.dns.sb -t ns google.com
; <<>> DiG 9.18.30 <<>> @public-dns-a.dns.sb -t ns google.com
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34374
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;google.com. IN NS
;; ANSWER SECTION:
google.com. 11502 IN NS ns2.google.com.
google.com. 11502 IN NS ns4.google.com.
google.com. 11502 IN NS ns3.google.com.
google.com. 11502 IN NS ns1.google.com.
;; Query time: 15 msec
;; SERVER: 2a09::#53(public-dns-a.dns.sb) (UDP)
;; WHEN: Mon Nov 25 15:51:21 CET 2024
;; MSG SIZE rcvd: 111
$ dig @public-dns-a.dns.sb -6 -t ns google.com
; <<>> DiG 9.18.30 <<>> @public-dns-a.dns.sb -6 -t ns google.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21409
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;google.com. IN NS
;; ANSWER SECTION:
google.com. 81910 IN NS ns3.google.com.
google.com. 81910 IN NS ns2.google.com.
google.com. 81910 IN NS ns4.google.com.
google.com. 81910 IN NS ns1.google.com.
;; Query time: 16 msec
;; SERVER: 2a09::#53(public-dns-a.dns.sb) (UDP)
;; WHEN: Mon Nov 25 15:51:30 CET 2024
;; MSG SIZE rcvd: 111
$ dig @public-dns-a.dns.sb -4 -t ns google.com
;; communications error to 185.222.222.222#53: timed out
;; communications error to 185.222.222.222#53: timed out
;; communications error to 185.222.222.222#53: timed out
; <<>> DiG 9.18.30 <<>> @public-dns-a.dns.sb -4 -t ns google.com
; (1 server found)
;; global options: +cmd
;; no servers could be reached