Numbers on Wirez

Autonomous System Numbers: Private Ranges Explained

Mon, 01 Jun 2026 00:00:00 +0000

The original 16-bit Autonomous System Number format provides exactly 65,536 unique identifiers, a pool now largely consumed by global expansion. You will examine the specific reserved ranges like 64512-65534 for private use, the distinct allocation blocks managed by ARIN and RIPE NCC, and the strict RFC1930 compliance required for new assignments.

AS Number Basics: Why Your Network Needs One

Sun, 01 Feb 2026 00:00:00 +0000

An AS Number provides a unique identity for any network aiming to control its own routing decisions and publish specific policies. This identifier is the fundamental requirement for organizations to operate as recognized, independent entities within the global internet infrastructure. Without this designation, a network cannot establish the necessary trust or policy frameworks required for modern interconnection.

Autonomous system routing: How 105k networks connect

Tue, 01 Dec 2020 00:00:00 +0000

Over 105,000 ASNs currently empower diverse industries, marking a massive expansion beyond their original ISP exclusivity. An autonomous system functions as the fundamental administrative unit of the internet, enforcing a single routing policy across complex network boundaries. This shift from 16-bit integers to 32-bit AS numbers was not optional; it became mandatory when the original limit of 65,536 assignments proved insufficient for global growth. We dissect the mechanics of BGP routing, explaining how the Internet Assigned Numbers Authority delegates blocks to regional registries to prevent exhaustion of the address space. The discussion includes the specific role of AS_TRANS as a placeholder ensuring compatibility between legacy routers and modern BGP speakers.