If you’ve ever created a private hosted zone in Route 53, you may have noticed it always assigns the same name servers:
ns-1536.awsdns-00.co.uk. ns-0.awsdns-00.com. ns-1024.awsdns-00.org. ns-512.awsdns-00.net.
The numbers don’t seem to be coincidental.
1536 is the RFC number for “Common DNS Implementation Errors.”
512 and 1024 (binary 2^9 and 2^10 respectively) are common numbers in computing.
0 is just, well, 0.