3 ms·

You have more choice if you were allocated a /48 though.

• jgrahamc 12y ago
  You have 16 bits. So you can generate 2^16 unique hashes out of a space of 2^28. So you have a 1/4096 chance of getting a collision.
• billpg 12y ago
  Exactly. Since it looks like there's no salting going on, if you know your target's IPv6 (and from that their calculated class E), you could quite easily go through your own set of available addresses and see if any result in the same class E address as your target.
  • eastdakota 12y ago
    It wouldn't be a good assumption that the code we posted to the blog is exactly the same as the code that is actually in production. If we included something like a salt, we obviously wouldn't reveal it.
• opendais 12y ago
  Yep and those aren't hard to find. Alot of VPS/Dedi providers would give you this allocation for free.