Ok thanks, does not resolve on Google and Cloudflare, only on Quad9, weird dig @8.8.8.8 mirror.tspu.ru                                                                                                                                                  /tmp ; <<>> DiG 9.16.12 <<>> @8.8.8.8 mirror.tspu.ru ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 1177 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 512 ;; QUESTION SECTION: ;mirror.tspu.ru.                        IN      A ;; Query time: 100 msec ;; SERVER: 8.8.8.8#53(8.8.8.8) ;; WHEN: lun. avril 26 11:45:48 CEST 2021 ;; MSG SIZE  rcvd: 43 dig @9.9.9.9 mirror.tspu.ru                                                                                                                                                  /tmp ; <<>> DiG 9.16.12 <<>> @9.9.9.9 mirror.tspu.ru ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6208 ;; flags: qr rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1232 ;; QUESTION SECTION: ;mirror.tspu.ru.                        IN      A ;; ANSWER SECTION: mirror.tspu.ru.         41602   IN      A       193.106.132.11 ;; Query time: 116 msec ;; SERVER: 9.9.9.9#53(9.9.9.9) ;; WHEN: lun. avril 26 11:46:02 CEST 2021 ;; MSG SIZE  rcvd: 59