SpeedTest1
TCP/IP settings
Looks for an active connection type and assigned interface addresses.
Guided diagnostics
Find where a connection problem begins.
The SpeedTest iPhone app runs six focused checks in sequence, turning a vague connection problem into a shorter list of likely causes.
Review the checks
Six checks
From the device interface to the public internet.
2
Default route
Checks whether traffic can reach a known public destination outside the local network.
3
Local network
Identifies whether Wi-Fi, cellular, or another path is active and reports local interface context.
4
DNS resolution
Attempts to resolve a known public domain into one or more network addresses.
5
Internet access
Contacts the speed-test service over HTTPS to confirm external reachability.
6
Public IP
Retrieves the outward-facing address and provider information through ipwho.is.
How to read a failed check
A failed early check often makes later failures expected. If no active IP interface exists, DNS and public-internet checks will also fail. Start with the first failure rather than treating every red result as a separate problem.
TCP/IP or local network fails
Confirm Wi-Fi or cellular data is enabled. Reconnect to the network and check whether iOS shows a valid connection. A captive portal may require you to sign in before internet access works.
Default route fails
The device may be connected to a router without a working upstream link. Restarting or checking the router and modem is more relevant than changing DNS at this stage.
DNS fails but internet reachability works
The network path exists, but names cannot be resolved reliably. A router, VPN, custom DNS profile, or provider resolver may be involved.
Public IP fails
The lookup service may be unavailable or blocked even when normal browsing works. This result alone does not prove the internet connection is down.
Diagnostic scope: these checks provide evidence, not a complete certification of a network. VPNs, relays, firewalls, captive portals, endpoint outages, and iOS restrictions can affect results.
Start with a baseline.
Measure download, upload, and latency in your browser.