I need help with a PTR record

Question

I've put a small mail server on the Azure free tier to experiment with the Azure cloud services.

How do I setup a PTR record :

http://242.5.219.4.in-addr.arpa <===> http://mail.prometheus-systems.co.za

Answer 1

Hi @Prometheus Systems

Welcome to the Microsoft Q&A Platform.

Thank you for reaching out, and I hope you are doing well.

az network public-ip show --ids $(az network public-ip list --query "[?ipAddress=='4.X.X.242'].id" --output tsv) --query "reverseFqdn" --output tsv

If the above query is still displaying a blank result insteadreverseFqdn, you can check all DNS settings using the command below

az network public-ip show --ids $(az network public-ip list --query "[?ipAddress=='20.X.X.164'].id" --output tsv) --query "dnsSettings"

If it is showing the reverseFqdn in the output, you can filter it using the command below.

az network public-ip show --ids $(az network public-ip list --query "[?ipAddress=='20.X.X.164'].id" --output tsv) --query "dnsSettings.reverseFqdn"

Output:

Update Public IP

az network public-ip update -g MyResourceGroup -n <name of the public IP address> --dns-name <Globally unique DNS entry.>

Reference: Update a public IP resource with a DNS name label and static allocation.

Powershell script to configure the PTR record:

$pip = Get-AzPublicIpAddress -Name "YourPublicIPName" -ResourceGroupName "YourResourceGroupName"
$pip.DnsSettings.ReverseFqdn = "venkatthej.shop"
Set-AzPublicIpAddress -PublicIpAddress $pip

Follow the link: https://learn.microsoft.com/en-us/answers/questions/564126/how-to-create-a-ptr-record for the same related issue.

I hope this helps to resolve your issue.

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