I kind of disagree.
If you have any kind of control at the registrar level, you can change the authoritative DNS servers.
You simply need to find another DSP that "works" for you.
There are even free ones.
Like:
CloudFlare1984.isClouDNS.net
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I agree.
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Using Registrar WHOIS Server: https://whois.auda.org.au gives this information
- Domain Name: SAVCOM.COM.AU
- Registry Domain ID: D407400000002954936-AU
- Registrar WHOIS Server: whois.auda.org.au
Registrar URL: https://www.instra.com/en/about-us/contact-us- Registrar URL: Contact Us - Instra Corporation
- Last Modified: 2023-12-04T03:56:00Z
- Registrar Name: Domain Directors Pty Ltd trading as Instra
- Registrar Abuse Contact Email: abuse@key-systems.net
- Registrar Abuse Contact Phone: +49.68949396850
- Reseller Name:
- Status: serverRenewProhibited https://identitydigital.au/get-au/whois-status-codes#serverRenewProhibited
- Status Reason: Not Currently Eligible For Renewal
- Registrant Contact ID: AKI1266405118
- Registrant Contact Name: Administration IPHoldingGroup
- Registrant Contact Email: scrales@gmail.com
- Tech Contact ID: ASI1381471783
- Tech Contact Name: Administration IPHoldingGroup
- Tech Contact Email: scrales@gmail.com
- Name Server: NS1.PARTNERCONSOLE.NET
- Name Server: NS2.PARTNERCONSOLE.NET
- Name Server: NS3.PARTNERCONSOLE.NET
- DNSSEC: unsigned
- Registrant: Savcom pty ltd
- Registrant ID: ABN 58076471764
- Eligibility Type: Company
- Eligibility ID: ABN 58076471764
Seems like Instra Corporation being the Domain Registrar is the place to start with to change the Domain Name Servers to a different DNS Provider.
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Seems to be working now.. Instra Corporation - Domain Name Search & Registration Services
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Agree if you can't get support it is a good reason to switch.
My only other suggestion is to look at other configuration options at that provider. The two "stray" IP are connected to Amazon and might be related to an email forwarding service.
Look for any kind of URL Forwarding, URL Redirect, or some kind of mail system service in the DNS settings. See if any are different for this compared to your others at this same provider. Something seems fundamentally wrong even if one of these is causing this trouble. Longer term a more reliable DNS provider is the way to go.
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Thanks MikeMcQ, this could be the issue but I will need to check with the customer if they have any extra bits. DNS Zone records all look good and if this is e-mail related it is stopping 80/443 as well.... which doesn't make sense of course (e-mail: 25, 587, 143, 993 etc)
One thing I have managed to do so hoping this keeps them going is they have a wildcard-ed domain so when I run 'certbot' there are numbered options for each sub-domain (actually represent each web server node DNS name).... these sub-domain names all resolve to the real IP only thanks to A records, so I have selectively re-certed specific nodes for now.... phew.
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No, it doesn't. But, neither do other parts of this problem 
Agree it is a reach. But those odd IP reverse to something related to mail forwarding. Might not mean anything. We see other DNS providers using AWS services for things like URL Redirect features.
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Good point, I'd forgotten that, ironically. GoDaddy works an alternative, there are not a lot of .au options who trade globally: https://www.auda.org.au/accredited-registrars
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