"At the end of the day, with 340 trillion trillion trillion addresses, handing out too many isn't ever going to be a big worry in the foreseeable lifetime of...

"At the end of the day, with 340 trillion trillion trillion addresses, handing out too many isn't ever going to be a big worry in the foreseeable lifetime of...anything, really." This is untrue, and a big over exaggeration. Consider that pretty much any business (even a mom-and-pop shop) is allocated a /48 if they ask for it. Assuming one thousand /48 are allocated every second (ie. one thousand "business" IPv6 users coming online per second, which might be absolutely plausible 100+ years from now --we made IPv6 to be future proof right?), then we would run out of allocatable blocks in the global unicast IPv6 space (2000::/3) in 1,115 years. And we would run out of allocatable blocks in the entire IPv6 space in 8,919 years. So, yeah, I get annoyed when people mention the "death of the sun" or the "lifetime of the universe" when talking about IPv6, when in fact we could start running into exhaustion issues in the next ~1000 years. Note that I am being pedantic here. I think any technology that seems to scale "only" for our needs up to ~1000 years from now is good enough :)