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How to Resolve a Missing PTR Record for a Microsoft 365 IP Address

Maira Mehtab Sep 21, 2026 869 views

Question details

The user is encountering a reverse DNS check failure indicating a missing PTR record for an IP address owned by Microsoft.

Product: Microsoft 365
Device & OS: not provided
Scenario: Troubleshooting reverse DNS and potential outbound email delivery issues after changing domain name servers.
Observed behavior: The reverse DNS query fails because no PTR record exists for the Microsoft IP address, and neither the ISP nor the domain registrar can create or manage it.

Before you start

Ensure you have administrator access to your Microsoft 365 Admin Center and your domain's DNS management portal before requesting PTR record changes.

Solution 1Recommended

Contact Microsoft 365 Support to Create the PTR Record

Because the IP address is owned by Microsoft, only their network team can create or modify the reverse DNS (PTR) record.

PTR records are strictly controlled by the organization that owns the IP address block. Even if you manage the forward DNS domain, your ISP or domain registrar cannot create a PTR record for a Microsoft-owned IP. You must submit a request directly to Microsoft.

Log in to the Admin Center

Navigate to the Microsoft 365 Admin Center and log in using your global administrator credentials.

Open a Service Request

Click on 'Support' or 'Help & Support' in the left-hand navigation pane to create a new support ticket.

Detail Your Request

Explain that you need a reverse DNS (PTR) record configured for the specific Microsoft-owned IP address associated with your service.

Provide Forward DNS Proof

Include evidence in your ticket that your forward DNS record correctly points to the Microsoft IP address, as this is a prerequisite for them adding the PTR record.

Prerequisite Check: Microsoft will typically only configure a PTR record if the corresponding forward DNS (A record) already resolves correctly to that IP address.

Solution 2

Verify Port Settings and Forward DNS Configuration

Check your local domain settings and outbound email ports to ensure there are no configuration blockers on your end.

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Frequently Asked Questions

Why can't my ISP or domain registrar fix my missing PTR record?

PTR (reverse DNS) records must be managed by the organization that owns the IP address block. Since the IP address is owned by Microsoft, only Microsoft has the technical authority to update its reverse DNS zone.

What is a PTR record used for in Microsoft 365?

A PTR record resolves an IP address back to a domain name. It is primarily used by receiving email servers to verify the sender's identity, preventing spam, and ensuring reliable outbound email delivery.

How can I check if my PTR record is missing?

You can use online DNS lookup tools like MxToolbox or command-line utilities such as 'nslookup' or 'dig -x [IP Address]' to perform a reverse DNS query and see if the proper hostname is returned.

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