TTL Calculator
Configuration
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DURATION
Shorthand:
Max Propagation:
Estimated Worldwide Propagation by:
Multi-Unit Conversions
Seconds
Minutes
Hours
Days
Weeks
Migration Settings
Fast Rollback: Global reversion will take max .
Cutover Timeline
Phase 1 • Lower TTL
Lower DNS TTL to on nameservers.
Phase 2 • Eviction Wait
Wait for old caches worldwide to expire.
Phase 3 • Cutover
Switch DNS records to new server IP/target.
Phase 4 • Complete
99%+ global traffic shifted to new server.
Phase 5 • Restore TTL
Restore standard TTL () after 48h stability.
Ping / Packet Input
HOP COUNT
Hops Traversed
Deducted Baseline:
Sender
Hop 1
Operating System Signatures
| Platform | Default TTL | Match |
|---|---|---|
| Linux / macOS / Android / iOS | 64 | |
| Microsoft Windows (11, 10, Server) | 128 | |
| Cisco IOS / Enterprise Devices | 255 |
Traffic Settings
Performance Impact
Cache Cycles / Day
Queries to Origin / Day
Average QPS
Cache Hit Ratio
Developer Tools
TTL Calculator
An advanced, multi-purpose Time-to-Live (TTL) suite for developers, network administrators, and DevOps engineers. Calculate human-readable DNS TTL durations, compute exact global propagation windows, design zero-downtime DNS cutover timelines, inspect IP packet ping TTLs to estimate network hop counts and operating system signatures, and model DNS cache query loads.
Instant Client-Side Computation
DNS & IP Packet Modeling
RFC 1035, RFC 2181 & RFC 791
Cutover Best Practice
Never execute a DNS cutover without lowering TTL beforehand. Set TTL to 300 seconds (5 minutes) at least as far in advance as your existing TTL duration (e.g. 24 hours prior). Once propagated worldwide, perform your record change for rapid propagation and instant rollback capability.
