Network protocols
DNS SOA serial comparison
Compare 32-bit SOA serials across wraparound.
Your inputs
Start with an exampleYour result
Example resultAa — A small example of your colors.
How it works
Compute the forward difference modulo 2³². Zero means equal; differences below 2³¹ are later; exactly 2³¹ is undefined.
Serial 0 is later than 4294967295 by one step.
Limits
This compares serial arithmetic only, not SOA dates, propagation or server state.