---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/glossary/ptr#article
headline: Pointer record (PTR)
description: "*Internet standard*. A DNS record that maps an IP address to one hostname in a domain."
url: https://www.twilio.com/docs/glossary/ptr
inLanguage: en
dateModified: 2026-05-06T13:22:30.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# Pointer record (PTR)

*Internet standard*. A DNS record that maps an IP address to one hostname in a domain. It is also known as a reverse DNS record.

To configure [reverse DNS][rDNS] for your dedicated IP address in Twilio Email, add a [CNAME record][cname] to your DNS server.

## Related entries

* [Mail Exchanger record (MX)][mx]
* [Domain Name System (DNS)][dns]
* [Fully Qualified Domain Name][fqdn]

[cname]: /docs/glossary/cname

[mx]: /docs/glossary/mx-record

[dns]: /docs/glossary/dns

[fqdn]: /docs/glossary/fqdn

[rDNS]: /docs/glossary/reverse-dns