Alternative Method: /48 Prefix Allocations There are only this many /48 prefixes left:   Projected IPv6 Exhaustion Date 70,370,000,000 AD

In Perspective
4,600,000,000 AD	Sun explodes; Earth destroyed	Source
70,370,000,000 AD	IPv6 Exhaustion
1,000,000,000,000,000 AD	Formation of new stars cease	Source
100,000,000,000,000,000,000 AD	Solar systems no longer exist	Source
10,000,000,000,000,000,000,000,000,000,000,000,000,000 AD	Proton decay: no more atoms	Source

Calculation details

Alternate Method: Addresses Used