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Reverse DNS will resolve regardless of the state of your server. They have have TTL for the reverse DNS record set at 1 hour in which case even if you change the hostname, it may take up to an hour fo

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ask support to update reverse dns to your site.

Reverse DNS is irrelevant and likely the root of your miscommunication.

Have you put in a ticket to update your reverse DNS record? DCs are notoriously slow in updating those.

It's not just the hosting providers who won't work with them. Supposedly it's also credit card companies, payment processors, email providers, DNS providers etc.

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Thank you for respond, but I will not use the ns of each domain. I planned to use a whitelabel dns for all my domain.

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usage: Dns (iodine) and a uptime monitor

I added A and AAAA record to point to your dns1 and dns2 IP address, but porkbun won't let me change into my whitelabel dns, it only accept yours, mixing it with yours also unavailable.

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For DNS (iodine), VPN (small usage), and some HTTP testing with some Unity apps

IPv6 DNS Compatible

Advanced DNS Management

DNS = 1.1.1.1, 1.0.0.1