iPhone DNS Cache Explained: How iOS Stores Domain Lookups

• 22 June 2026
• by: Amara Diallo
• in: Server Performance
• Tags: DNS caching, dns propagation, dns ttl, ios networking, iphone dns cache
• note: no comments

Understand what the iPhone DNS cache is, how iOS caches domain-to-IP lookups, how TTL controls expiry, and why stale entries cause sites not to update.

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