In the vast and interconnected world of the internet, Autonomous System Numbers (ASNs) serve as critical identifiers that underpin the routing of data across the global network. Understanding and acquiring an ASN is essential for organizations seeking to manage their networks effectively and ensure seamless communication within the internet infrastructure.
An Autonomous System (AS) is essentially a collection of IP networks and routers under the control of one or more network operators that adhere to a single, clearly defined routing policy. It’s like having a distinct identity within the broader internet, enabling efficient management and coordination of network routing.
ASes facilitate communication within their network and with external ASes through a set of rules and policies. They can be categorized into three types based on their routing policies and interconnectivity: Multihomed AS, Transit AS, and Stub AS. These categorizations help in defining the role and operational scope of each AS within the internet ecosystem.
ASNs are unique numerical identifiers assigned to each AS, playing a pivotal role in the global routing architecture. They enable the AS to exchange routing information with other autonomous systems, thereby maintaining the global internet routing table’s integrity and accuracy.
There are two types of ASNs:
The process of obtaining an ASN has evolved to become more streamlined and accessible. Here are the general steps an organization needs to follow to request an ASN:
Understanding and obtaining an ASN is essential for any organization that wishes to participate actively in the global internet infrastructure. By following the steps outlined above and collaborating with your RIR, organizations can secure their ASN and contribute to the robustness and efficiency of internet routing.
As we continue to witness the growth and evolution of the internet, ASNs will remain central to maintaining its interconnected and decentralized nature. Therefore, it’s crucial for network operators and organizations to stay informed and engaged with internet governance processes, ensuring a stable and scalable network for future generations.
| ASN Type | Description | Use Cases |
| 2-byte | 16-bit number, range from 0 to 65535 | Traditional internet routing |
| 4-byte | 32-bit number, expanded range for future growth | Modern, scalable internet infrastructure |
| Public | Used for routing on the global internet | Multi-homing, large networks |
| Private | Used for routing within private networks | Single-homed networks, internal routing |
Please note that while this article provides a primer on ASN acquisition, the specific requirements and processes can vary depending on your RIR and current internet governance policies. Always consult with your RIR for the most current information and procedures.
Evgeny Sevastyanov
Client Support Teamleader
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