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IT Granules - PTR or Reverse IP Lookup

What is PTR (pointer) record?

The PTR (Pointer) record is a type of DNS (Domain Name System) record that performs reverse DNS lookups. It maps an IP address to a domain or hostname, providing information about the entity associated with that IP address. Enter IP Address below to find an associated domain with it.

How PTR Records Work

1. Reverse DNS Lookup: Unlike traditional DNS lookups that resolve domain names to IP addresses, a reverse DNS lookup involves finding the domain or hostname associated with a given IP address.

2. PTR Record Format: PTR records have a specific format. They typically consist of an IP address in reverse order, followed by ".in-addr.arpa." For example, if the IP address is 192.168.1.1, the corresponding PTR record might be "1.1.168.192.in-addr.arpa."

3. Use Cases: PTR records are commonly used for various purposes, including email authentication (SPF, DKIM, DMARC), network troubleshooting, and security checks. Email servers often check PTR records to verify that the connecting IP address has a valid reverse DNS entry, helping prevent spam.

Example PTR Record

Consider the following example of a PTR record:

1.1.168.192.in-addr.arpa. IN PTR example.com.

In this example, the PTR record associates the IP address 192.168.1.1 with the domain "example.com."

Keep in mind that PTR records are managed by the organization responsible for the IP address space and are typically set up through the entity providing the IP address, such as an Internet Service Provider (ISP) or hosting provider.