Study Notes

  • Exactly how big is an IPv6 address?

It’s 128 bits long.

  • This shouldn’t be on the test, but how many unique addresses is that?

That’s 2^128 or a “3” with 38 zeros after it.  That’s also 2^95 addresses for each person on earth.

  • Surely we’re not writing in binary, are we?

No way.  IPv6 uses 32 hex characters.  Each character is 4 bits, so we wind up with 128 bits of data.