Hostname validation backoff schedule

After you create a custom hostname, Cloudflare has to validate that hostname.

Attempts to validate a Custom Hostname are distributed over 7 days (a total of 75 retries). At the end of this schedule, if the validation is unsuccessful, the custom hostname will be deleted. The function that determines the next check varies based on the number of attempts:

• For the first 10 attempts:

now() + min((floor(60 * pow(1.05, retry_attempt)) * INTERVAL '1 second'), INTERVAL '4 hours')

• For the remaining 65 attempts:

now() + min((floor(60 * pow(1.15, retry_attempt)) * INTERVAL '1 second'), INTERVAL '4 hours')

The first 10 checks complete within 2 minutes and most checks complete in the first 4 hours. The check back off is capped to a maximum of 4 hours to avoid exponential growth. The back off behavior causes larger gaps between check intervals towards the end of the back off schedule: