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An online tool – There are many online tools that can perform reverse DNS lookups.The most common methods to perform a reverse DNS lookup are using: Reverse DNS lookup is used for various purposes, such as verifying email sender domains and website authenticity, identifying spam sources and email message origins, improving network security, and troubleshooting network issues. It maps an IP address to a domain name to provide additional information about the host and its network.

While forward DNS lookup translates domain names into IP addresses, reverse DNS lookup will do the opposite. A related term is DNS pointer record (PTR), which provides the domain name associated with an IP address. In this article, we will discuss what is reverse DNS lookup and its uses, and the basic procedures related to DNS reverse lookup such as how to set up reverse DNS lookup, and how to add a reverse lookup zone in DNS.īoth reverse DNS lookup and DNS reverse lookup are interchangeable terms and have the same meaning. While DNS mainly works in a forward direction, an important related process is reverse DNS lookup or DNS reverse lookup. The purpose of the Domain Name System (DNS) is to translate human-readable domain names into machine-readable IP addresses. That’s it! The PTR record is now added and will prevent your mail from ending up as spam.What is Reverse DNS Lookup: The Major Procedures and How to Do it 28 July 2023 on #rDNS, #reverse-DNS-lookup, #domain-names, #DNS Specify Gcore’s name servers and for the subnet xx.xx.xx/24 and wait up to 24 hours for DNS cache updating. Open the added reverse zone xx.xx.xx.in-addr-arpa in the control panel and add the PTR records you need.Ĥ. You can add a subnet up to /24 bits for your IP address.ģ. When you get a reverse DNS zone, add it in the Gcore Customer Portal according to the guide Getting started with Managed DNS. Contact an organization with RIR status (that is, a technical registrar authorized to create and delegate reverse DNS zones) and ask them to delegate the zone of your subnet to Gcore NSs.Ģ. You need to have a dedicated IP space (IPv4 or IPv6) to configure the reverse DNS zone. Configure reverse DNS zone and PTR record For example, a Gcore site address 80.240.113.62 in a reverse DNS query would be 62.113.240.80.in-addr.arpa.Īnd the IPv6 in a reverse DNS lookup will work the same way, but with a slight difference. After creating a zone under the TLD, you can then create a PTR record in the UI.Īn IPv4 host address in the reverse DNS zone is represented in the format: .in-addr.arpa. You can add a PTR record to a reverse lookup zone only if your zone is under the top-level domain (TLD) in-addr.arpa (for IPv4) or ip6.arpa (for IPv6). What is a reverse DNS lookup zone?Ī reverse DNS lookup is a special zone that is intended to define the hostname by its IPv4 or IPv6 address using a PTR record. Therefore, in the Gcore Customer Portal, there is no PTR record in the list of DNS records that can be added for a forward domain zone. Note: A PTR record can be added only in the reverse DNS zone (RDNS) and not in a regular domain zone. This allows the naming of subnet sections with human-readable domains instead of IP addresses.

For the convenience of tracing dedicated subnets.

Today, there exist more convenient modes of authentication, like DKIM, DMARC, and SPF, and usually, these are used together with PTR records. The destination mail server compares the PTR record of the sender mail server IP address with the host/domain part of a sender email address.

As an anti-spam measure in email delivery.

Setting up a PTR record and reverse DNS zone What is a PTR record for?Ī PoinTeR or PTR record is an A record in reverse: it associates server IP with a domain name.

Lookup reverse dns