Does using HTTP/3 mean a website is unsafe?

No. HTTP/3 is a stack component, not a verdict. ScanMalware scores the whole page — its scripts, redirects, certificates, threat-intelligence matches and behaviour — so a site using HTTP/3 can be perfectly safe or actively malicious.

How many sites using HTTP/3 has ScanMalware scanned?

HTTP/3 has been detected in 85,689 public scans on ScanMalware.com. Each scan is a real headless-browser visit, and the figure updates as new URLs are submitted.

What technologies are commonly used with HTTP/3?

There is not yet enough scan data to report reliable co-occurrence patterns for HTTP/3.

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HTTP/3

HTTP/3 is the latest version of the HTTP protocol, running over QUIC for faster, more resilient connections. ScanMalware records HTTP/3 support from the Alt-Svc header and negotiated connections.

HTTP/3 support indicates a modern server or CDN stack. It is a transport-layer capability and carries no direct bearing on whether a site’s content is safe.

Public scans

85,689

How ScanMalware detects HTTP/3

HTTP/3 is detected by analysing the response headers, HTML markup, JavaScript runtime and asset URLs captured when ScanMalware loads the site in a real headless browser.

From any scan you can pivot into related signals — JARM TLS fingerprints, ASN ownership and BGP routing, certificate history, JavaScript analysis and the overall security verdict — to understand not just that HTTP/3 is present, but how it is being used. Open the full search interface for HTTP/3 →

Recent public scans featuring HTTP/3

A rolling sample of recent public scans where HTTP/3 was detected. Listing a site here is not a safety judgement — open a scan to see its full verdict.

Site	Scanned
Cloudflare Workers https://blue-waterfall-eaa5.emgiles.workers.dev/	2026-06-16
CISA12 - Consorzio Intercomunale Socio Assistenziale https://www.cisa12.it	2026-06-16
My Framer Site https://simple-brand-124884.framer.app/	2026-06-16
Ordine dei Giornalisti del Molise – Sempre al fianco dei nostri iscritti https://www.odgmolise.it	2026-06-16
» Home - Giulianova Patrimonio S.r.l. https://www.giulianovapatrimonio.it	2026-06-16
What Is My IP? See Your Location, ISP & Network Details https://www.whatismyip.com	2026-06-16
Consorzio Stradale Riunito - Comune di Semproniano https://www.comune.semproniano.gr.it/it-it/consorzio	2026-06-16
Sign in to your account https://interdigital-my.sharepoint.com	2026-06-16

Frequently asked questions about HTTP/3

Does using HTTP/3 mean a website is unsafe?: No. HTTP/3 is a stack component, not a verdict. ScanMalware scores the whole page — its scripts, redirects, certificates, threat-intelligence matches and behaviour — so a site using HTTP/3 can be perfectly safe or actively malicious.
How many sites using HTTP/3 has ScanMalware scanned?: HTTP/3 has been detected in 85,689 public scans on ScanMalware.com. Each scan is a real headless-browser visit, and the figure updates as new URLs are submitted.
What technologies are commonly used with HTTP/3?: There is not yet enough scan data to report reliable co-occurrence patterns for HTTP/3.

Browse all profiled technologies on the technology index, or scan a URL to see its full stack.