Is this MTU test free?

Yes. IP Checker Online offers this MTU test at no cost with no account required. Results load in real time.

Do you store my searches?

We do not permanently store your queries on our servers. Some tools run entirely in your browser; others fetch public data for the request only.

Can I use this on mobile?

Yes. Open the page in any modern phone or tablet browser. Results work on Wi‑Fi and mobile data.

What is path MTU discovery?

PMTU finds the smallest MTU along the route using ICMP. Browser-based tools cannot run full ICMP PMTU; lower MTU manually when you see VPN or PPPoE issues.

Network Tools

MTU Test — Maximum Transmission Unit Calculator

Calculate MTU payloads and check host reachability

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