h3check.de HTTP/3 · QUIC · Check
DE EN
powered by

HTTP/3 check (QUIC) for your domain

Find out in seconds whether your website supports HTTP/3 – including a real connection test over QUIC.

Host:
Stored result from Sep 3, 2026, 11:51 Check again now →
chapemroz.ir HTTP/3 inactive HTTP/3 is advertised, but no QUIC connection could be established – usually a firewall blocking UDP/443.

HTTP/3 status

HTTP/3 advertised Whether the server signals via Alt-Svc that HTTP/3 is available.
YES
HTTP/3 working Whether a real QUIC connection (UDP/443) can be established and the page fetched over it.
NO
TLS version HTTP/3 mandates TLS 1.3 – QUIC supports nothing older.
TLS 1.3
IPv6 Whether an AAAA record is published in DNS.
NO
Show Alt-Svc header 
h3=":443"; ma=2592000, h3-29=":443"; ma=2592000, h3-Q050=":443"; ma=2592000, h3-Q046=":443"; ma=2592000, h3-Q043=":443"; ma=2592000, quic=":443"; ma=2592000; v="43,46"
HTTP/3 is configured, but it never gets through.

Your server is configured for HTTP/3 – the packets just never arrive. In almost every case a firewall or security group is dropping UDP port 443. Our guide has the exact commands: enabling HTTP/3.

Rather not deal with it? On turbopress hosting HTTP/3 works out of the box.

Embed the badge

Show on your own site that you run HTTP/3. The badge updates with every new check.

HTTP/3 status of chapemroz.ir
Show HTML code 
<a href="https://h3check.de/en/check/chapemroz.ir/"><img src="https://h3check.de/badge/chapemroz.ir.svg?lang=en" alt="HTTP/3 status of chapemroz.ir" width="197" height="30"></a>
API: /api/v1/check?domain=chapemroz.ir

Public checks

NEW WordPress Speed Test chapemroz.ir – free Core Web Vitals test
Test it now →

HTTP/3 check & HTTP3 test – what does it mean?

This free HTTP/3 check tells you whether your website already uses the modern HTTP/3 protocol. An HTTP3 test is particularly useful when you are assessing the performance of your website, your WordPress hosting or your LiteSpeed/CDN configuration.

HTTP/3 is built on QUIC and normally uses UDP port 443. It can cut latency, handle connection drops more gracefully and often loads faster – especially on mobile networks. That is why so many people look for an HTTP3 check, QUIC test or HTTP/3 test.

We show two things. First, whether your server advertises HTTP/3 at all (via the Alt-Svc header). Second, whether a real HTTP/3 connection can actually be established. If your result is "NO", the cause is usually the server configuration, the CDN, blocked UDP/443, or simply that HTTP/3 has not been enabled yet.

Want HTTP/3 for WordPress without the tinkering? At turbopress hosting HTTP/3 is on by default (LiteSpeed Enterprise) – tuned for performance and security.

Keywords: HTTP/3 check, HTTP3 check, HTTP/3 test, HTTP3 test, QUIC check, QUIC test, h3 check.

How to enable HTTP/3: nginx, LiteSpeed, Cloudflare, Apache & Plesk A step-by-step guide to turning on HTTP/3 (QUIC) on your server – including the pitfall that breaks it in roughly half of all real-world cases. The Alt-Svc header explained: how browsers discover HTTP/3 Why the very first request to a website never uses HTTP/3, what the Alt-Svc header contains, and how HTTPS DNS records solve the problem. QUIC vs HTTP/2: what actually makes HTTP/3 faster Head-of-line blocking, handshake latency and connection migration – where HTTP/3 genuinely beats HTTP/2, and where the difference is barely measurable.
h3check.de · made for supercharged WordPress 🚀
Knowledge · API · Statistics · Imprint · Privacy
turbometrics Performance-Score HTTP/3 status of h3check.de