How to Clear the DNS Cache on iPhone: 5 Reliable Methods

• 20 June 2026
• by: Hannah Cole
• in: Server Performance
• Tags: dns cache, dns propagation, dns troubleshooting, ios, iphone networking
• note: no comments

When a website refuses to load the way it should on your iPhone, or a site you just migrated still points to its old server, the culprit is often a stale DNS cache. Your iPhone stores DNS lookups locally to load sites faster, but that convenience can backfire when the underlying records have changed. The good news is that clearing the DNS cache on an iPhone takes seconds and requires no technical skills or hidden developer tools.

This guide walks through every reliable method to clear the DNS cache on iPhone, explains how DNS caching actually works, and helps you tell the difference between a phone-side cache problem and a much more common cause that no amount of cache clearing will fix.

Key Takeaways
• The fastest way to clear the DNS cache on an iPhone is to toggle Airplane Mode on and off.
• iOS has no command-line `flushdns` tool; you clear the cache through built-in settings actions instead.
• A full restart or a Reset Network Settings clears the cache more thoroughly.
• Switching your Wi-Fi DNS server can bypass a stale resolver entirely.
• Most “stale” records you see are actually DNS propagation or TTL delays, not your phone’s cache.

Why Would You Need to Clear the DNS Cache on iPhone?

The Domain Name System (DNS) translates human-friendly domain names like `example.com` into the numeric IP addresses that devices use to connect. To avoid repeating that lookup for every request, your iPhone caches the answers. When the answer changes but the cache does not, your phone keeps using outdated information.

You typically need to clear the DNS cache on your iPhone when:

• A website moved to a new server and you still land on the old version or an error page.
• You changed hosting or domain DNS records and the updates are not appearing on your device.
• A site loads on another network or device but fails only on your iPhone.
• You are troubleshooting connectivity after a domain, CDN, or email configuration change.
• A previously blocked or redirected domain should now resolve correctly.

In each case, forcing your iPhone to discard cached entries makes it perform a fresh lookup, which can immediately reflect the corrected records.

How Does DNS Caching Work on iOS?

Every DNS record carries a Time To Live (TTL) value, measured in seconds, set by the domain’s authoritative DNS provider. The TTL tells resolvers and devices how long they are allowed to reuse a cached answer before checking again. A record with a 3600-second TTL, for example, can be cached for up to an hour.

On iOS, caching happens at more than one level:

• The iPhone’s local resolver holds recently used records in memory.
• Your router or Wi-Fi network may cache records for all connected devices.
• Your internet provider or DNS resolver (such as a public DNS service) caches them upstream.

This layered design is why a single method does not always work. Clearing your iPhone’s cache will not help if the stale answer is being served by your router or upstream resolver. Understanding these layers is the key to choosing the right fix below.

A counterintuitive truth worth internalizing: when a DNS change “won’t take” on your iPhone, the local cache is rarely the real bottleneck. In practice, the record you are seeing is usually still inside its TTL window somewhere upstream, or the change is still propagating across the global DNS system. You can clear your iPhone’s cache repeatedly and still see the old IP because your router or ISP resolver is honoring a TTL that has not yet expired. Before blaming your phone, check the record from an independent network or a public DNS-lookup service. If the new value appears there but not on your phone, the issue is local. If the old value still appears everywhere, no amount of cache clearing on your iPhone will help, you simply have to wait for propagation.

What Are the Methods to Clear DNS Cache on iPhone?

Because iOS hides low-level networking, you clear the cache indirectly by resetting the network state. The table below summarizes each method, ranked from quickest and least disruptive to most thorough.

Method	Speed	Thoroughness	Disrupts Saved Settings?	Best For
Toggle Airplane Mode	Fastest (seconds)	Light	No	Quick, everyday cache refresh
Restart the iPhone	Fast (1-2 min)	Moderate	No	A more complete flush of network state
Switch DNS in Wi-Fi settings	Fast	Bypasses cache	No (per-network)	Avoiding a stale resolver entirely
Reset Network Settings	Moderate (2-3 min)	Most thorough	Yes (Wi-Fi passwords, VPN, etc.)	Persistent issues that survive a restart
Wait for TTL / propagation	Slow (minutes to 48h)	N/A (server-side)	No	When the record itself is still stale

Method 1: Toggle Airplane Mode (Quickest)

Turning Airplane Mode on and off forces your iPhone to drop and re-establish its network connections, which clears the active DNS resolver state in the process.

1. Open Control Center (swipe down from the top-right corner, or up from the bottom on older models).
2. Tap the Airplane Mode icon to turn it on. Wait about 10 seconds.
3. Tap it again to turn it off.
4. Reload the website you were trying to reach.

This is the method to try first because it is instant and changes nothing about your saved settings.

Method 2: Restart the iPhone

A full restart clears the device’s memory, including the in-memory DNS cache, more completely than an Airplane Mode toggle.

1. Press and hold the side button and either volume button until the power-off slider appears (on Face ID models). On Touch ID models, hold the side or top button.
2. Drag the slider to power down, then wait a few seconds.
3. Press and hold the side button again until the Apple logo appears.

Once the iPhone boots, every DNS lookup starts fresh.

Method 3: Switch DNS in Wi-Fi Settings

Instead of clearing the cache, you can sidestep a stale or slow resolver by pointing your Wi-Fi connection at a different DNS server.

1. Go to Settings > Wi-Fi.
2. Tap the information (i) icon next to your connected network.
3. Tap Configure DNS, then switch from Automatic to Manual.
4. Remove the existing entries and add a reputable public DNS server address, then tap Save.

Switching resolvers makes your iPhone query a server that may already hold the corrected record, bypassing a cached or misconfigured one upstream.

Method 4: Reset Network Settings

If the cache problem persists, a Reset Network Settings clears all network-related caches and configurations at once. Note that this also removes saved Wi-Fi passwords, VPN profiles, and cellular preferences, so have those credentials handy.

1. Open Settings > General.
2. Tap Transfer or Reset iPhone.
3. Tap Reset, then choose Reset Network Settings.
4. Enter your passcode and confirm.

Your iPhone restarts with a completely clean network state, including an empty DNS cache.

Method 5: Wait for TTL and Propagation

When the methods above do not change what you see, the record itself is likely still propagating or sitting inside its TTL window upstream. In that case, the only reliable fix is time. Waiting for the TTL to expire, often anywhere from a few minutes to 48 hours depending on the record’s configuration, allows every resolver in the chain to fetch the updated value.

Why Is There No `flushdns` Command on iPhone?

If you have used a desktop computer, you may know commands like `ipconfig /flushdns` on Windows or `dscacheutil -flushcache` on macOS. iOS deliberately has no command-line interface for end users, and there is no Terminal app or shell where you could run such a command without specialized developer tooling.

Apple’s design philosophy keeps low-level system management out of reach to protect device stability and security. As a result, the settings-based actions above are the official equivalents of a manual DNS flush. They achieve the same outcome, forcing fresh lookups, through the interface Apple provides rather than a typed command.

A Quick Note on DNS Changes and Hosting

If you are clearing your iPhone’s DNS cache because you recently changed hosting providers or edited your domain’s DNS records, remember that propagation governed by TTL is usually what you are waiting on, not your phone. With DarazHost, DNS changes are handled through an easy-to-use DNS management panel, and propagation simply takes the time your records’ TTL dictates. If you are unsure whether a change has gone live or why an update is slow to appear, DarazHost’s 24/7 support can confirm your records, check propagation, and walk you through any DNS adjustment. For a practical walkthrough, see .

Frequently Asked Questions

How do I clear the DNS cache on my iPhone quickly? The quickest method is to toggle Airplane Mode on for about 10 seconds and then off. This drops and re-establishes your network connections, clearing the active DNS resolver state without disturbing any of your saved settings.

Does restarting my iPhone clear the DNS cache? Yes. A full restart clears the device’s in-memory DNS cache as part of shutting down and rebooting. It is more thorough than an Airplane Mode toggle but takes a minute or two longer.

Will clearing the DNS cache delete my data or settings? Airplane Mode toggles and restarts delete nothing. However, Reset Network Settings removes saved Wi-Fi passwords, VPN configurations, and cellular preferences, so use it only when lighter methods fail and keep your credentials ready.

Why does a website still show the old version after I clear the cache? Most often because the change is still propagating or the record’s TTL has not expired on your router or ISP resolver. If a public DNS-lookup service shows the new value but your phone does not, the issue is local; if it shows the old value everywhere, you must wait for propagation. See .

Is there a flushdns command for iPhone? No. iOS has no user-facing command line, so there is no `flushdns` equivalent. The built-in settings actions, such as Airplane Mode, a restart, or a network reset, are the official ways to flush DNS on iOS.

Conclusion

Clearing the DNS cache on an iPhone is simple once you know the layered nature of DNS. Start with the fastest fix, an Airplane Mode toggle, then escalate to a restart, a DNS switch, or a Reset Network Settings if needed. Above all, remember that a stubbornly stale site is frequently a propagation or TTL matter on the server side rather than anything on your phone, so check from an independent source before assuming the cache is to blame. With that mental model, you can resolve most “the site won’t update” frustrations in minutes.