Autonomous Systems and Internet Routing Fundamentals

You've learned how packets move across networks using IP addressing and subnetting. But how does the internet itself know where to send traffic? The answer lies in Autonomous Systems and the routing protocols that connect them. As a Telnyx NOC engineer, understanding this layer is critical — our voice traffic traverses multiple networks, and routing problems directly impact call quality.

What Is an Autonomous System?

An Autonomous System (AS) is a network or collection of networks under a single administrative domain that presents a unified routing policy to the internet.

Think of it this way:

A network is a single LAN or subnet
An AS is an entire organization's routing domain — all of Telnyx's infrastructure, for example, operates under one AS

Every AS is identified by a unique AS Number (ASN):

16-bit ASNs: 1–65534 (original range, running out)
32-bit ASNs: 65536–4294967294 (extended range)

Telnyx's Autonomous System

Telnyx ASN: AS46887

You can look this up:

# Query Telnyx's ASN info
whois AS46887

# See what prefixes Telnyx announces
# (via bgp.he.net or command line)
curl -s https://stat.ripe.net/data/announced-prefixes/data.json?resource=AS46887 | jq '.data.prefixes[].prefix'

💡 NOC Tip: okmark https://bgp.he.net/AS46887 — it's the quickest way to see Telnyx's announced prefixes, peers, and upstream providers during an incident.

Types of Autonomous Systems

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