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PTR Records

What are PTR (Pointer) Records?

Pointer records are used to map a network interface (IP) to a hostname for a reverse DNS configuration. PTR records are configured within reverse DNS domains (in-addr.arpa) domains.

PTR Record Fields

Field Description

A) Name The last octet of the IP address you are configuring reverse DNS for.

B) TTL The TTL (Time to Live) in seconds is the length of time the record will cache in resolving name servers and web browsers. The longer the TTL, then remote systems will lookup the DNS record less frequently. Your nameservers will also receive less query traffic since most queries are answered by resolving name servers. Conversely, the shorter the TTL the faster any changes you make to your DNS will propagate in servers that have cached data. However, your domain will receive more query traffic.

Recommended values:

Records that are static and don’t change often should have TTL’s set between 1800 (being on the low end) to 86400 seconds (30 minutes to 1 day cache).

Records configured with Failover or that change often should have TTL’s set anywhere from 180 to 600 (3 to 10 minutes cache).

If a change is needed for a record with a high TTL, then the TTL can be lowered prior to making the change and then raised back up again after the changes were made


C) System This will be the host name of the computer or server the IP resolves to, for example mail.example.com. It is important to note, the domain name is automatically appended to the end of this field unless it ends with a dot (.).

D) Notes Add a helpful note with keywords so you can search for your records later.

E) Save Save your record changes and don’t forget to commit your changes after you’re done making record changes for this domain!


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Reverse DNS Overview

Before you set up your PTR records, you should first go through the Reverse DNS tutorial and set up Reverse DNS domains on Constellix name servers.

1.Select Managed DNS and click on Domains
AXFR1

2. Select the Domain Name you want to add a PTR record to.
select a domain

3. Under the PTR Records section, click on the plus_icon icon to add a record.
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4. In this screen, you will add the record information. Follow the steps below:

A) Name: This will be the hostname for your record. It is important to note, the domain name is automatically appended to the “Name” field of the record.
B) TTL: Edit the TTL. Time to Live is measured in seconds and is the amount of time the record will cache in resolving name servers and web browsers.
C) System: This will be the host name of the computer or server the IP resolves to.
D) Notes: Add a helpful note with keywords so you can search for your records later.
E) Save and Close: Save your changes. Don’t forget to commit your changes.

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