We actually scan on average once a week. I used that language to be ultra conservative but I'll need to change it. For the past 8+ years we've been doing weekly scans.

In case you see this, the most interesting question I think I could possibly ask is, what does the current real-world impact of IPv6 appear to be practically speaking?

Abstractly and intuitively, IPv6's massiveness would seem to put an end to the interesting closed loop of address space vs backhaul capacity that has developed around v4. I can't help but wonder though - with for example some providers leasing out ginormous blocks of address space according to fairly predictable patterns (and customers just using the first v6 address that pops out - if at all), this makes me wonder if it'll be possible to steer v6 scans using a mix of statistics, machine learning, and Perl if statements :).

The other thing I'm idly curious about is how you actually scan on a regular basis. Broadly speaking about long-term viability, I guess the TL;DR probably boils down to coordination and careful nurturing of reputation similar to what the large-scale email providers maintain. But from a technical perspective, I do wonder if/how much things like peering, and BGP, and noise-cancelling routing (if you will), etc, come into the picture - and how big the links are :D

I would be very happy to coincidentally discover writeups touching on these questions anytime. Thanks for reading :)