DNS TTL Cache Hit Rate Calculator

Estimate DNS cache hit rate based on TTL and query frequency. Cache_hit_probability ≈ 1 - (query_interval / TTL). Lower TTL = more recursive queries; higher TTL = longer propagation delay for DNS changes

Each component has a specific meaning:

• TTL — The ttl recorded for the scenario being assessed.
• Query frequency — The query frequency recorded for the scenario being assessed.

Note: Interpret the dns ttl cache hit rate result against the thresholds and context described above.

Enter the TTL, query frequency for the scenario you are assessing. Estimate DNS cache hit rate based on TTL and query frequency. Cache_hit_probability ≈ 1 - (query_interval / TTL). Lower TTL = more recursive queries; higher TTL = longer propagation delay for DNS changes. Use the dns ttl cache hit rate result to inform your calculation.