DNS Change Timing Sheet
Fill this in before publishing a DNS change so you know when old caches should be gone.
BFCBrilliance · bfcbrilliance.com/tools/dns-propagation-time-calculator
Change details
- Date
- Domain
- Record type
- Current TTL (hours)
- Change type
- Resolver cache window (hours)
Propagation estimate
| Item | Value | Notes |
|---|---|---|
Tool constants
- TTL meaning
- Cache lifetime set on the DNS record
- Record update delay
- 2 hours
- Nameserver change delay
- 24 hours
- Estimated full propagation
- TTL + cache window + change delay
Before you publish
- Lower TTL ahead of time if possible
- Confirm the new record value is correct
- Check the old record after the change
- Wait for caches to expire before assuming failure
Common mistake
People often test only from their own network and assume the change is broken. DNS is cached at multiple layers, so one location can update long before another.