You’re at the right place if you want to learn about Reverse DNS lookup and Reverse IP lookup and the different tools to perform them.
DNS lookup is a valuable source of information that can assist organizations and attackers in detecting DNS vulnerabilities.
The DNSSEC protocol implementation is one of the most well-known ways to protect against DNS threats like DNS hijacking and on-path attacks.
This article will look at how to perform DNS and IP reverse lookup using some online tools for security research.
Let’s get started.
Online DNS and Reverse IP Address Lookup Tools
Let’s explore the top most effective tools you can use to perform a DNS and reverse IP address lookup.
Reverse IP/DNS API
Reverse IP/DNS API by WhoisXML API allows users to see all the connections between IP addresses and hostnames. This product line is fueled by a market-leading repository of passive DNS data containing billions of IP and DNS records.
Reverse IP/DNS tools have gained the trust of thousands of users, aiding them in adding DNS context to security platforms, accelerating threat detection and response, expanding threat intelligence, and more.
Currently, the product line includes a/an:
API with output queries in XML and JSON formats. The API lets users query up to 10 IPs per second and can be easily integrated with Splunk and Postman platforms.
DNS Database with files available in a unified and consistent CSV format, updated daily, weekly, or monthly, depending on user requirements. Download the CSV sample to test the data in your environment.
GUI lookup tool that allows users to check the domain names sharing an IP address in seconds and download the results in JSON format.
DomainTools is a tool to perform the reverse IP lookup on any website. Type its domain name or IP address into the text box and click ‘Lookup.’ It rapidly gives the results you want.
Using this web service, you can also perform other operations like checking the hosting history, bulk parsed whois lookup, and even IP monitoring (tracking changes to registered domain names associated with an IP Address).
Next, let’s understand the concepts of reverse DNS lookup and reverse IP lookup.
What is Reverse DNS lookup?
A typical DNS record points a domain name to an IP address, which tells a computer where a request for information should be sent on the internet. This is known as forward resolution and has a forward DNS record. This is done each time you go to a website on the internet.
DNS record is just like a phone book for the internet where we save the contacts using the names of mobile numbers.
A reverse DNS record is the exact opposite of a forward DNS record. You just begin by looking up the IP address to see what domain or hostname is associated with it.
Reverse DNS, often known as rDNS, is not as widely utilized as conventional DNS lookups. A domain must point to an IP address, but the IP address does not need to have a Reverse DNS record on it. Without even an rDNS record, domains will still load.
Reverse DNS entries are stored in a particular PTR-record type.
Performing a Reverse DNS lookup on an IP can be done easily by running commands in a terminal. On Windows, Mac, and Linux, there is a command called nslookup.
In the below example, you can see that I performed DNS and reverse DNS lookup on the target website.
This does a lookup and first tells where it’s getting the information from. Here, it shows the details about DNS resolver information first. Then, it shows the hostname that the reverse DNS record points to for the given IP.
What is Reverse IP Lookup?
A reverse IP lookup looks up the domain name and IP address and lists all the domains hosted on the same server. It finds all the DNS A records associated with a specific IP address. It essentially returns a list of all domain names with the same IP address.
Now, the question is what the attacker will do by knowing the names of other web applications that are running on the same server. After all, they are not hacker targets.
Let’s say website A is the target web application, and hackers couldn’t find any vulnerabilities to exploit.
In this case, a hacker does the reverse IP lookup, and let’s say they find out that Website B is also registered on the same server.
Now, suppose website B has bugs that are easy to exploit, and by exploiting these bugs or vulnerabilities, they can get hold of the server hosting these web applications. As a result, the attacker will also have access to all the information on website A. These websites may belong to the same organization or different organizations. To stop a thief, one has to think like a thief. That’s why knowing about Reverse IP lookup is very important for security researchers.
Leveraging DNS and reverse IP lookup tools empower individuals to make informed decisions regarding their online activities.
I hope you found this article very useful in learning the difference between DNS & IP reverse lookup and the various methods and tools to perform them.
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