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The only idea that comes to my mind regarding Port 53 would be DNS.

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10, CentOS stream 2, so I assume it's probably a DNS misconfiguration somewhere.

* Reverse DNS Management

Not sure but Cloudflare WARP does which comes with it's own DNS channel.

IPv6: 16 IPv6 addresses included Reverse DNS: FREE Our team is 24/7 at your service! 10 free remote hands a month! Free announcing of your PI or own ip's or your ASN

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Vps with wireguard using 149.112.112.112 (quad9), 84.200.69.80 (dns.watch).

I use Google DNS for my PC

as my native connection with my own customized DNS settings running.

I use the combination. According to DNS Jumper software I use to allot IP for my home router.. For my country 8.8.4.4 has less than 15ms and 1.0.0.1 less than 30ms resolve time than their same counter

https://lowendspirit.com/discussion/1486/bash-script-to-update-all-dns-records-on-cloudflare-zone-if-hetrixtools-api-return-offline

This seems to have flown under the radar. Internap experienced a ransomware attack and as a result has ceased offering email, database, and website services. - It does not appear they were able to re…

i have multi domains

Yes, IPv6 RDNS has to be set by us - please open a support ticket.

Also, when I tried to set the reverse DNS records for IPv6 addresses, it says reverse DNS is disabled for this ipaddress