{"id":28930,"date":"2022-07-26T13:34:57","date_gmt":"2022-07-26T13:34:57","guid":{"rendered":"https:\/\/easydmarc.com\/blog\/?p=28930"},"modified":"2026-01-21T07:48:49","modified_gmt":"2026-01-21T07:48:49","slug":"what-is-a-dns-ptr-record","status":"publish","type":"post","link":"https:\/\/easydmarc.com\/blog\/what-is-a-dns-ptr-record\/","title":{"rendered":"What is a DNS PTR Record?"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">We\u2019ve introduced you to different <\/span><a href=\"https:\/\/easydmarc.com\/blog\/top-8-most-common-types-of-dns-records\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">types of DNS records<\/span><\/a><span style=\"font-weight: 400;\"> in our blog, including the A record, <\/span><a href=\"https:\/\/easydmarc.com\/tools\/aaaa-record-lookup\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">AAAA record<\/span><\/a><span style=\"font-weight: 400;\">, and DNS MX record. This post explores the <\/span><b>DNS PTR record <\/b><span style=\"font-weight: 400;\">and everything you need to know about it. Let\u2019s get started!<\/span><\/p>\n<h2><b>What is a PTR Record in DNS?<\/b><\/h2>\n<p><b>What is a PTR record in DNS? <\/b><span style=\"font-weight: 400;\">A PTR or Pointer record is a type of DNS record that provides the domain name attached to a certain Internet Protocol (IP) address. This is the exact opposite of the DNS <\/span><a href=\"https:\/\/easydmarc.com\/tools\/a-record-lookup\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">A record<\/span><\/a><span style=\"font-weight: 400;\">.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">While the DNS A record provides the IP address of a domain name, a PTR record provides the domain name of an IP address. <\/span><b>PTR record DNS<\/b><span style=\"font-weight: 400;\"> is often used in <a href=\"https:\/\/easydmarc.com\/tools\/ptr-record-checker\">reverse DNS lookup<\/a>.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Generally, when you attempt a domain search in your browser, a DNS lookup occurs, matching the domain name to the IP address. The opposite occurs in reverse lookup\u2014this is a DNS query that begins with the IP address and looks up the domain name.\u00a0<\/span><\/p>\n<h3><b>PTR Record Syntax<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">The structure of a PTR record is similar to other DNS record types. Below is the format of a PTR record.\u00a0<\/span><\/p>\n<ul>\n<li><b>&lt;name&gt;<\/b><span style=\"font-weight: 400;\"> &#8211; The first PTR record field containing the IP address.\u00a0<\/span><\/li>\n<li><b>&lt;ttl&gt;<\/b><span style=\"font-weight: 400;\"> &#8211; Determines a query\u2019s period of validity in seconds before it needs to be activated again.\u00a0<\/span><\/li>\n<li><b>&lt;class&gt;<\/b><span style=\"font-weight: 400;\"> &#8211; Contains the abbreviation of the network class used.<\/span><\/li>\n<li><b>&lt;type&gt;<\/b><span style=\"font-weight: 400;\"> &#8211; Defines the record type.<\/span><\/li>\n<li><b>&lt;rdata&gt;<\/b><span style=\"font-weight: 400;\"> &#8211; Holds the resource data\u2014the domain name.\u00a0<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The PTR syntax is structured similarly to the A record, but the field content differs.\u00a0<\/span><\/p>\n<h2><b>Why Do You Need a PTR DNS Record?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The average user or computer doesn\u2019t need a PTR record, but it\u2019s still a valuable tool for security purposes. Here are some benefits of including a PTR record in your DNS.\u00a0<\/span><\/p>\n<ul>\n<li><b>Safety<\/b><span style=\"font-weight: 400;\">: PTR DNS records help receiving servers validate your sent emails via reverse DNS lookup. Similarly, your mail servers typically check PTR records to validate the authenticity of incoming messages.\u00a0<\/span><\/li>\n<li><b>Validation<\/b><span style=\"font-weight: 400;\">: The most popular email providers usually reject or mark messages as spam if they don\u2019t contain the required PTR configuration. A PTR record is a must-have if you don\u2019t want your mail to end up in your recipient&#8217;s spam box or be blocked altogether.\u00a0<\/span><\/li>\n<li><b>Investigation<\/b><span style=\"font-weight: 400;\">: Some systems only store the IP address, not the domain name. In such a case, PTR records help to identify the source of the traffic in a human-readable format.\u00a0<\/span><\/li>\n<\/ul>\n<h2><b>How to Add a PTR Record in DNS?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Creating or adding a PTR record to your DNS is straightforward. First, you must create a reverse DNS zone on the DNS nameserver for your server\u2019s main IP address, depending on the size of your IP address:<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">For IPv4 addresses, create the hostname for the reverse DNS zone by:<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Taking your IP address, such as 192.168.0.100<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Dropping the last set of numbers (or octet): 192.168.0.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Reversing the numbers: 0.168.192<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Adding \u201c.in-addr.arpa\u201d to the end, giving you the reverse zone domain: 0.168.192.in-addr.arpa.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">\u201c.arpa\u201d was the first top-level domain name created for the internet and is mostly used to manage network infrastructure today. It\u2019s also where DNS PTR records are stored (more info below).\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">DNS PTR records for IPv6 addresses exist in a separate namespace within the top-level \u201c.arpa\u201d domain. They\u2019re reverse-mapped and converted into 4-bit sections with the suffix \u201c.ip6.arpa.\u201d\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For instance, the IPv6 address 4321:0:1:2:3:4:567:89ab would have a DNS reverse lookup domain as: b.a.9.8.7.6.5.0.4.0.0.0.3.0.0.0.2.0.0.0.1.0.0.0.0.0.0.0.1.2.3.4.ip6.arpa.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">You\u00a0 can add a Pointer record to your forward-mapping zones to support zero-configuration networking too.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If you want to learn <\/span><b>how to add a PTR record in DNS<\/b><span style=\"font-weight: 400;\">, follow these steps:<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">Open your DNS provider control panel or portal.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Click on Manage &gt; DNS &gt; Zones.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Hit the DNS view tab.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Click the Zone.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Select \u2018Create Record\u2019 and choose \u2018PTR record\u2019 from the available options.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Input the information below on the PTR record page:<\/span><\/li>\n<li><b>Domain Name or IP Address:<\/b><span style=\"font-weight: 400;\"> Supply the Internet Protocol (IP) address or the domain name.<\/span><\/li>\n<li><b>Zone:<\/b><span style=\"font-weight: 400;\"> Choose a zone from the options available.<\/span><\/li>\n<li><b>Description: <\/b><span style=\"font-weight: 400;\">Enter a comment that describes the PTR record.<\/span><\/li>\n<li><b>TTL:<\/b><span style=\"font-weight: 400;\"> Input a number and select Hours, Minutes, and Seconds from the options.<\/span><\/li>\n<li><b>Disable for DNS protocol: <\/b><span style=\"font-weight: 400;\">You can tick this box to disable the DNS protocol temporarily.\u00a0<\/span><\/li>\n<li><b>Tags<\/b><span style=\"font-weight: 400;\">: Hit \u2018<\/span><b>Add\u2019 <\/b><span style=\"font-weight: 400;\">to attach keys to value and specify the following:<\/span><\/li>\n<li><b>Key: <\/b><span style=\"font-weight: 400;\">Input a name for the key.<\/span><\/li>\n<li><b>Value<\/b><span style=\"font-weight: 400;\">: Supply a value for the key.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Click \u2018Save and Close\u2019 to create your DNS PTR record.\u00a0<\/span><\/li>\n<li><b>DNS PTR Record Storage Options<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Unlike an A record, that\u2019s stored under the domain name, a Pointer record is stored in the IP address with \u201c.in-addr.arpa\u201d added. For instance, the PTR record for IP address 192.168.2.10 will be stored under \u201c10.2.168.192.in-addr.arpa\u201d. The \u201cin-addr.arpa\u201d was included because the .arpa top-level domain in the DNS holds the PTR record.\u00a0<\/span><\/p>\n<h2><b>How to Perform a PTR Record Lookup?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Like other DNS records, you can perform a PTR <\/span><a href=\"https:\/\/easydmarc.com\/tools\/dns-record-checker\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">DNS record lookup<\/span><\/a> <span style=\"font-weight: 400;\">to check if your details are correct. As PTR records are used for security and verification, your emails might end up in the spam box if the configuration is wrong. You can perform your <\/span><b>PTR record lookup <\/b><span style=\"font-weight: 400;\">using online tools or the command line.\u00a0<\/span><\/p>\n<h3><b>Using Online Tools<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">You can use online tools like EasyDMARC\u2019s <\/span><a href=\"https:\/\/easydmarc.com\/tools\/dns-record-checker\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">DNS Records Lookup<\/span><\/a><span style=\"font-weight: 400;\"> checker to instantly lookup PRT records\u2014find the domain name of an IP address. Simply input the IP address in the provided field and click the \u201cLookup DNS\u201d button.<\/span><\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-28931\" title=\"pasted image 0\" src=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2022\/07\/pasted-image-0.png\" alt=\"pasted image 0\" width=\"1600\" height=\"583\" srcset=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2022\/07\/pasted-image-0.png 1600w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2022\/07\/pasted-image-0-300x109.png 300w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2022\/07\/pasted-image-0-1024x373.png 1024w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2022\/07\/pasted-image-0-768x280.png 768w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2022\/07\/pasted-image-0-1536x560.png 1536w\" sizes=\"(max-width: 1600px) 100vw, 1600px\" \/><\/p>\n<h3><b>Using Command Line<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">You can also use your command line to lookup your PTR record and check if your IP address resolves to its corresponding hostname.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Windows users can use the following command line:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">nslookup IP_ADDRESS<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The process is similar if you want to perform a PTR lookup as a macOS user. You can use the below command.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">dig -x IP_ADDRESS<\/span><\/p>\n<h2><b>Summary<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">While the PTR record isn\u2019t compulsory, it\u2019s necessary for security and verification reasons. Email providers often use the PTR record to help confirm the authenticity of messages.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Configuring a PTR record on your DNS is vital to avoid spam folders or rejection. Now that you know <\/span><b>how to add a PTR record to DNS servers<\/b><span style=\"font-weight: 400;\">, you can ensure correct configuration while simultaneously enhancing the safety of incoming emails and the authenticity of your outgoing emails.\u00a0\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Check out our other blogs if you want answers to questions like: <\/span><a href=\"https:\/\/easydmarc.com\/blog\/what-is-a-dns-record-dns-records-explained\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">What is a DNS record?<\/span><\/a><span style=\"font-weight: 400;\"> You\u2019ll also learn about <\/span><span style=\"font-weight: 400;\">DNS spoofing<\/span><span style=\"font-weight: 400;\"> and various other <\/span><a href=\"https:\/\/easydmarc.com\/blog\/top-10-most-common-types-of-cyber-attacks\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">cyberattack types<\/span><\/a><span style=\"font-weight: 400;\">. Stay informed, stay safe.<br \/>\n<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>We\u2019ve introduced you to different types of DNS &#8230;<\/p>\n","protected":false},"author":1,"featured_media":32646,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[306,205],"tags":[],"class_list":["post-28930","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dns-records","category-knowledge-base"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What is a DNS PTR Record? | EasyDMARC<\/title>\n<meta name=\"description\" content=\"DNS PTR records are vital for reverse DNS lookup\u2014matching domain names to IP addresses. 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