We all learned in school that IPv4 is 32-bit and IPv6 is 128-bit. But that never really explains why the whole world hasn't just switched over yet.
I just published a quick deep-dive on why NAT basically became the most successful temporary band-aid in tech history, and why replacing a core internet protocol is so painfully hard.
Give it a read here and let me know if you're dealing with dual-stack headaches at work: 
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