IPv4 is unfortunately coming to an end.  When attending a course for CCNA, I recall the instructor stating that the IPv4 address spacing was dying out and would have already been exhausted if it was not for NAT (network address translation); it is a method to map numerous private addresses inside a local network to one public IP address prior to transferring the information onto the internet (What is NAT, Comptia). This workaround is utilized often, giving organizations valuable IP space and prolonging the inevitable upgrade to IPv6.  Aside from exponential address spacing in IPv6, IPSEC is no longer optional like in IPv4.  IPv6 has an elongated header, accommodating data integrity and authentication during transmission across the internet.  It is common practice for hackers to conduct reconnaissance.  When serving in the Army as a combat medic, I was assigned to a specific unit where members would conduct reconnaissance and observe enemy outposts (MOS 19D), and many hackers conduct similar surveillances virtually.  Port scanners such as Nmap are often used to conduct scans; however, the 128-bit upgrade IPv6  impedes these comprehensive searches. It would be the comparison of the same platoon conducting reconnaissance of an area of one football field to about five football fields, which would dramatically exacerbate the decline of resources. 

With the various built-in security features that IPv6 incorporates, why are organizations apprehensive about embracing this upgrade?  I am a network engineer for the USDA; we are running scripts to transition each food processing station from deprecated IPv4 to IPv6.  This requires substantial expenses and resources to conduct these transitions, which cost organizations a hefty bill after the transition is complete. Excentis says, “For the core network, replacing core routers with expensive hardware is not done daily. This means this transition even takes more time and money.”  As mentioned, NAT has been made to extend address spacing, eliminating the need for mandatory IPv6 upgrades.

Network Address Translation Definition | How NAT works | Computer Networks | CompTIA. (n.d.). CompTIA. https://www.comptia.org/content/guides/what-is-network-address-translation

Bram. (2022, June 24). 5 reasons why the adoption of IPv6 takes so long. Excentis. https://www.excentis.com/blog/5-reasons-why-the-adoption-of-ipv6-takes-so-long/

InfoSec (www.infosec.gov.hk). (2025, February 10). InfoSEC: IPV6 Security. InfoSec. https://www.infosec.gov.hk/en/best-practices/business/ipv6-security