What Is ASN Lookup And Why Do We Need It?

15 Mar 2023
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What does an Autonomous System (AS) mean?


The Internet is composed of Autonomous Systems which include collections of IP routing prefixes that permit Internet systems to connect to one the other. Without this routing, the Internet simply wouldn't function.

This tool can be used to determine the owner registered for any IP domain which is the system owner is the one who has their IP addresses. Remember that there isn't a connection between the IP address's location from the ASN and the geolocation. Numerous organizations have autonomous Systems that cover multiple continents If you find an IP address discovered in an AS that is located within the United States, this does not mean that the address is the physical location of the United States.

It is the ASN tool for searching and can be used to perform quick searches of an IP address, or Autonomous System Number (ASN). If you use the free version, of the tool, you can limit yourself to a maximum of 50 lookups per day. This also includes making use of additional IP tools available on HackerTarget.com has made available.


What does ASN Lookup mean?


The process of an SN search is the process of querying different RIR’s databases to find information regarding the Autonomous System Number (ASN). When you perform the Autonomous System lookup you can get AS details, for example:

  • AS-Block

  • Description

  • Mnt-by

  • Date of creation and last update

  • The source for the ASN information

  • Responsible organization

  • Aut-Num

  • Contact information for Abuse, Technical and Admin contact details

  • ASN Status

  • AS Name

  • Organization

While the majority of lookups are conducted against the regional RIR's, the ASN is part of There are some inactive ASN private databases that are provided by various organizations that offer this data.

What do we need ASN Lookup?


ASNs are vital for the functioning of the Internet however, the majority of people do not need to know the workings of these. Yet, ASNs can still be very useful because they can associate an IP address block with an organization, which means that we can search for details about an organization via an IP address.


Is anyone logging into my site?


One of the most popular uses for ASN information is the ability to figure out where your website visitors come from. Alongside geolocation data, various analytics tools can reveal which ISPs/organisations are logging into your site. This information is powered through ASN data.


Could this IP be fraudulent?


We can utilize ASN data to detect IP addresses that are infected with malware. For instance, if we notice an excessively high volume of login requests, we'll find the IP addresses sending those requests. If the IP addresses are associated with ASNs that are associated with hosting companies It's likely that they're trying to access your accounts for users! Additional data, such as IPdata's Threat API and data on location, could aid in this.


Who is the person who runs this site?


By using the DNS check, you will determine the IP addresses that serve a particular website. This will help us identify the hosting company and can also tell us whether the site is infected. IP addresses are retrieved with an online tool such as dnslookup.org or the dig Unix command like dig +short ipdata.co.