Which of the following is FALSE regarding the 16-bit public autonomous system numbers?

This statement is false. The range of public 16-bit Autonomous System Numbers (ASNs) is from 1 to 64511. The Internet Assigned Numbers Authority (IANA) has reserved the block from 64512 to 65534 for private use, as documented in RFC 6996. The number 56319 does not represent any official upper boundary for the public 16-bit ASN space. The public range extends up to the beginning of the reserved private-use block.

A: IANA centrally manages the global pool of ASNs and allocates large blocks to the five Regional Internet Registries (RIRs) for distribution within their designated regions. B: Public ASNs are a fundamental component of the Border Gateway Protocol (BGP), uniquely identifying each network (Autonomous System) to enable inter-domain routing across the public Internet. D: ISPs, typically acting as Local Internet Registries (LIRs), are a primary channel for assigning public ASNs to enterprise customers that meet the RIR's policy requirements, such as multihoming.

1. Internet Assigned Numbers Authority (IANA). Autonomous System (AS) Numbers Registry. This registry explicitly shows the allocation of 16-bit ASNs, with the public range extending to 64511 before the private range begins. Retrieved from: https://www.iana.org/assignments/as-numbers/as-numbers.xhtml

2. IETF RFC 6996. Autonomous System (AS) Reservation for Private Use. August 2013. Section 3, "16-bit AS Number Reservation", states: "IANA has reserved a 1024 AS number block of 16-bit AS numbers, 64512-65534, for private use." This defines the end of the public range. (DOI: https://doi.org/10.17487/RFC6996)

3. American Registry for Internet Numbers (ARIN). Number Resource Policy Manual (NRPM). Version 2023.3, Section 5.1, "Criteria for ASN Assignment". This document outlines that an organization can obtain an ASN through its upstream provider (ISP), confirming the validity of statement D.

4. Nokia. 7750 SR OS R22.10.R1 BGP and VPRN Guide. Part 1, "BGP Overview". This guide describes the use of ASNs in BGP according to IETF standards, confirming that public ASNs are used for connecting different ASs on the internet.