ASN
An Autonomous System Number identifies a network that controls its own routing policy.
What it means
An ASN is the number used to identify an autonomous system: a network, or group of IP prefixes, operated under a single routing policy. If your organization wants to run BGP with one or more upstream networks, an ASN is usually the identifier other networks use to exchange routes with you.
Where it fits
- Organizations running BGP
- Multi-provider Internet designs
- Networks with their own public IP space
- Private backbone designs that need clear routing control
- Customers that want ISP-like control over how traffic enters and exits their network
What we'll talk through with you
- Will you run BGP with Quad State Internet, another provider, or both?
- Do you have public IP space, or do you need help planning that too?
- Are you multi-homing or do you have a unique routing policy?
- What organization should hold the ASN registration?
- Who will be the routing, admin, and billing contacts?
How it shows up in a real project
A company wants to connect to Quad State Internet and a second upstream provider while keeping one routing identity. The company requests an ASN, builds a BGP policy, and uses Quad State Internet to help turn up and support the routing.
We start by translating the business need into endpoints, capacity, term, resiliency, and support expectations.
We identify carrier meet points, IX ports, cloud on-ramps, colocation footprints, or private handoffs that matter.
The answer may be DIA, IP Transit, Type II access, dark fiber, wavelength, IRU, managed transport, or a blend.
Quad State Internet can build, coordinate, light, monitor, document, and support the route after turn-up.
How to get an ASN in the United States
In the United States, ASN requests generally go through ARIN. Quad State Internet can help you decide whether you actually need an ASN, prepare the routing story, and turn up BGP after the number is assigned.
Process
- Decide whether you need one. You usually need an ASN when your network will run BGP, use its own routing policy, or connect to more than one upstream network.
- Create or use an ARIN Online account tied to the organization that should hold the resource.
- Make sure the ARIN account is linked to an authorized Point of Contact record and valid Organization Identifier.
- Submit the ASN request in ARIN Online with the routing justification, projected use, and upstream or policy details.
- Respond to ARIN questions, review any agreement or invoice steps, and complete ARIN's approval process.
- After assignment, configure BGP, route filters, IRR/RPKI records where applicable, monitoring, and support procedures.
Official references
- ARIN Autonomous System Numbers guide
- ARIN requesting IP addresses or ASNs
- ARIN Number Resource Policy Manual, AS Numbers
- ARIN fee schedule
ARIN rules and fees can change. Use the official ARIN pages for the current process, and use Quad State Internet for route planning, BGP turn-up, and operational support.