ASN Lookup tool tells the ASN WHOIS details. Just enter the AS number and find which company is using that ASN and what the origin of that company is. i.e., country, city, latitude, longitude, state, etc.
The ASN search tool quickly looks up Autonomous System Number (ASN). Enter the AS number, find which company uses that ASN, and more.
AS number lookup or ASN lookup querying the different RIR databases to get information about the ASN. From the ANS checker, you can grab the following information, such as
ASN is generally the same for all IPs of any organization, network operator, or domain with the same and clear external routing policy.
The specific ASN can be allowed or denied access to any network with policy-based routing.
To perform the autonomous system number lookup for ASN WHOIS, perform the following steps.
The internet world is a network of networks. Autonomous systems are the extensive networks that make up the internet.
In simple words, the autonomous system (AS) is the network or the group of networks with a SINGLE and CLEARLY DEFINED routing policy. So if the autonomous systems have to communicate with each other, they need a unique number or identifier.
Each autonomous system (AS) assigns a unique autonomous system number (ASN), a unique globally available identifier. It allows its AS to exchange routing information with other systems.
Consider an AS as a town's post office. The mail moves from one office to another until it reaches the proper town, and that town's post office is responsible for delivering it to the correct destination.
Similarly, the data packets move from one AS to another until it reaches the proper AS containing the destination IP address. The routers within the AS send that packet to the destined IP address.
Three types of autonomous systems need an autonomous system number (ASN).
Each device on the internet has a unique numerical address called an IP address. It's like your identification number on the internet. One from check my IP tool can get its device IP assigned to it by its ISP and locate its location from the IP location finder.
Every AS controls a specific set of IP addresses. Just like the town's post office, which is responsible for delivering the post to all the addresses within its territory. IP address space is the range of IP addresses over which an AS has control. More specifically, you can also call it an IP block.
When the network engineers communicate which IP addresses are controlled by which AS, they do so by talking about the IP address prefixes owned by each AS. An IP address prefix is the range of IP addresses represented in that fashion: 192.0.2.0/24.
Suppose a company, XYZ, operates AS and owns a range of IP addresses that include an IP 192.0.2.253. If the computer sends a packet to IP 192.0.2.253, it will eventually reach the AS operated by XYZ.
If that first computer sends a packet to IP address 198.51.100.255, the packet will move to a different AS.
Note: For reaching its destined IP address (198.51.100.255), the packet may even have to pass through the AS operated by XYZ.
Each AS is assigned an official number, which is a unique identifier. It's globally available and allows its AS to exchange routing information with other systems.
The Autonomous system number (ASN) can be public or private.
The ASNs were introduced to regulate networking organizations such as Internet Service Providers (ISP), government agencies, and educational institutions.
Till 2007, all autonomous system numbers were 2 bytes (16-bit). That gave Internet Assigned Numbers Authority (IANA) 65,536 possible ASNs to distribute. The IANA has reserved 1,023 ASNs (64,512 to 65,534) for private use.
But just like IPv4, these were also destined to run out. Just like the creation of IPv6, created 4-byte (32-bit) ASNs to overcome that issue. That gave IANA 4,294,967,296 possible ASNs to distribute. The IANA has reserved 94,967,295 ASNs (4,200,000,000 to 4,294,967,294) for private use.
Obtaining an autonomous system number (AS) requires the company or other party to submit a petition to the IANA through one of five global Regional Internet Registries or RIRs. The Regional offices are established for Africa, America, Asia, Latin America, the Caribbean, and Europe.
For example, to qualify for the ASN, an organization must have either.
Follow the procedure provided by ARIN for requesting an ASN if you lie in their regional territory.
Note: There is a limited number of ASNs available. And if the governing bodies provide ASNs too freely, the supply would run out, and routing becomes more complex.
Autonomous systems connect and exchange network traffic through a process called peering. Autonomous systems peer together by connecting at physical locations called Internet Exchange Points (IXPs).