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Reverse DNS Mappings


Reverse DNS is a technique in which an IP address is resolved into a domain name.

To reach the Reverse DNS Mappings screen:

  1. Sign in to the Client Portal.
  2. Open the Manage mega menu.
  3. Click Forward DNS / Reverse DNS under the Combined Functions heading.
  4. Click the Reverse DNS Records tab.

 Reverse DNS Records List

By default the Reverse DNS Records list will show all records. Use the Search field to narrow down the result. Know that the Verified Status, Domain , and IP Address columns are sortable.

Record Type

A PTR record is used to perform reverse DNS lookups. A PTR record or pointer record maps an IPv4/v6 address to the canonical name for that host. Setting up a PTR record for a hostname in the in-addr.arpa domain that corresponds to an IP address implements reverse DNS lookup for that address.

For example, www.random-site.com has the IP address 122.0.3.16, but a PTR record maps 16.3.0.122.in-addr.arpa. It is always advisable to have a proper reverse DNS record (PTR) set up for your servers, especially when you are running a mail / smtp server.

Creating PTR Records

During A/AAAA Address (Host) Record Creation

Whenever you add an A/AAAA Address (Host) Forward DNS Record, you can create PTR Records.

  1. Select a domain.
  2. Choose an A/AAAA Address (Host) record.
  3. Enter or add IP addresses. Use a comma to separate multiple entries.
  4. Select Pointer (PTR) Record Creation.
    • Create PTR Records. (ONLY if there are no PTR records associated to to the IP address(es) added.)
    • Always Create PTR Records. PTR Records created regardless of existing records associated to the IP addresses added.
    • Do not Create PTR Records. PTR records will not be created and you will not have rDNS mappings associated to the IP address(es) added.

When you decide to create PTR records, they will be made available on the Reverse DNS page.

Creating a PTR Record on the Reverse DNS Page

 Note

Use this method to add PTR records to external domains or any verified domains that already exist in My Domains.


Please note that External Domains will be marked as Unverified on the Reverse DNS page. You can always add them on the My Domains page in order to manage them in the Client Portal.
  1. Navigate to Manage > Forward / Reverse DNS.
  2. Select the Reverse DNS Records tab.
  3. Click the Add Reverse DNS button.
  4. Select Domain Type.

    • My Domain. Select a verified A/AAAA record.
    • External Domain. Enter an external domain (host) and assign at least one (1) IP address.
  5. Click Add to save the changes you've made.

The PTR record will be made available on the Reverse DNS Records page. PTR records tied to unverified external domains cannot be modified.

Available Actions

The phoenixNAP Client Portal enables you to modify or delete an existing rDNS record.

To modify a rDNS record:

  1. Open the Forward DNS / Reverse DNS screen.
  2. Click Reverse DNS Records.
  3. Click Actions > Modify under the Manage column. Pay attention to the main three (3) pieces of information:
    • DNS Record Type. This will display "PTR Pointer Record".
    • IP Address (v4/v6). The IP address(es) associated to the A/AAAA record.
    • A/AAAA Address (Host) Record. This displays the A/AAAA Address (Host) Record to which the IP address(es) maps to. Open the drop-down menu to select another A/AAAA Address (Host) Record.

 Modifying rDNS Records

Please be aware that you can select only those A/AAAA Address (Host) Records that share the same IP Address.

To delete a rDNS record:

  1. Open the Forward DNS / Reverse DNS screen.
  2. Click Reverse DNS Records.
  3. Click Actions > Delete in the row of the PTR record you want to delete.
  4. Click Delete to confirm you choice.