Typically, a PTR record can point to only one hostname through the IP reverse lookup process. It harms your trustworthiness and credibility and makes your customers wonder why your email is not reaching their inboxes. You never want your email to bounce back or be a part of a spam folder. Email is integral to the business, and PTR records usage is in Google's best practices. The mail servers use them to ensure that emails come from the location they claim to come from. Email services may block or reject all emails from that domain if a domain does not have a PTR record or the PTR record contains the wrong domain or hostname. It helps to check the domain or hostname(s) of an email address(es) and see if the associated IP address(es) is likely to be used by the legitimate email server.Īs anti-spam filters perform these checks, email delivery problems can occur from a misconfigured or missing PTR record. Some email servers like Gmail and Yahoo mail use anti-spam filters to check whether the IP address of a server trying to deliver mail has matching forward and reverse DNS records. These records are a must for outgoing mail servers. PTR records are used in reverse IP address lookups. What are the primary uses for PTR records? The IP address reverse lookup will perform the reverse IP search and provides you with the result.Īlso, check PTR records through multiple DNS servers worldwide with the WhatsMyDNS tool. Just enter the IP address and click on the "Submit" button. Note: Replace the IP_address with your domain's IP address. If you are using Linux or MAC OS, run dig -x IP_address on Linux's console terminal or MacOs's terminal. If you are using Windows, run nslookup IP_address in your command prompt. How to check the PTR record or perform a reverse IP lookup? 1. ![]() It is the domain or hostname associated with the IP address. ![]() A PTR record stored as the IP address is broken into segments and then reversed, followed by. In IPv4Īn, A record must exist for every PTR record. Therefore the IP address is specified in reverse sequence. Here, one thing is essential to remember that is reverse mapping. The syntax is similar to A record, but the field content differs. : It contains the resource data, the domain, or the hostname.: It contains the abbreviation of the DNS record class being used.On its expiry, it needs to be activated again. It is the time in seconds for which the entry is valid. The different pieces of information are arranged in the record in their relevant fields. The PTR record's structure is the same as other DNS record types. Here the user already knows the IP address and wishes to find the domain or hostname associated with that IP. When a user enters a domain name in the browser, the DNS lookup process occurs, matching the domain name to an IP address.Ī reverse DNS lookup or reverse IP address lookup is an opposite process that starts with an IP address and ends with the associated domain name or hostname's lookup. Typically, a user wishes to establish a connection to a server with an already-known domain name, but the user does not have the correct IP address. PTR record lookups are the opposite of an A record lookup for an IPv4 address and an AAAA record lookup for an IPv6 address. You can get the associated domain name or hostname using the IP address. PTR records, referred to as "reverse DNS" records, are used in IP reverse lookup. What is DNS PTR (Pointer) Record?Ī PTR record, known as a pointer record or reverse DNS record, is the type of Domain Name System (DNS) record used to store the domain or hostname for an IP address. If you enter your IP, it might point to the hostname of your ISP, or if you query your server's IP, it might show you your domain name on which it resolves. ![]() This hostname is Google's hostname against IP 8.8.8.8, which is Google's public DNS IP. The hostname is anything like a normal domain or sub-domain, i.e.,. The Reverse DNS Check tool queries the given IP to resolve to a hostname.
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