HTTPS / SVCB Lookup
Query the modern HTTPS (type 65) and SVCB (type 64) service binding records defined by RFC 9460. These records let browsers upgrade to HTTP/3, load Encrypted Client Hello (ECH) configs and skip redirect hops.
Ready to Analyze
Enter a target value above or click any sample preset chip to generate real-time diagnostic output.
About the HTTPS / SVCB Lookup Tool
The HTTPS/SVCB Lookup tool queries the modern service-binding record types defined in RFC 9460 — HTTPS (type 65) and SVCB (type 64). These records let a domain publish, in DNS, everything a client needs to open the fastest, most secure connection possible: supported ALPN protocols (HTTP/2, HTTP/3), IPv4 and IPv6 address hints, alternative ports, and — crucially — Encrypted Client Hello (ECH) configurations that hide the SNI from the network.
Chrome, Safari and Firefox all consult HTTPS records before making a request. Publishing one can eliminate a redirect hop, upgrade a client straight to HTTP/3, and enable ECH so on-path observers can't see which site you're visiting. Cloudflare, Fastly and other modern CDNs generate these records automatically for their customers.
Use HTTPS/SVCB Lookup to verify what your CDN or DNS provider is publishing, to debug why a browser isn't picking up HTTP/3, or to confirm ECH deployment. Pair with our SSL Checker and CAA Lookup for a complete TLS posture audit.
Enter the required value in the input field above (domain, IP, URL, or text depending on the tool).
Click the action button to run the check — results are computed instantly from our edge network.
Review the parsed output, key fields and any warnings shown in the result card.
Copy the result, share the page URL, or jump to a related tool from the sidebar to continue debugging.
- Queries both HTTPS (type 65) and SVCB (type 64)
- Shows raw parameters: ALPN, ipv4hint, ipv6hint, ech, port
- Runs over DoH — no local resolver in the way
- Perfect for verifying HTTP/3 and ECH deployment