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.
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.
How to use this tool
- 1Enter the required value in the input field above (domain, IP, URL, or text depending on the tool).
- 2Click the action button to run the check — results are computed instantly from our edge network.
- 3Review the parsed output, key fields and any warnings shown in the result card.
- 4Copy the result, share the page URL, or jump to a related tool from the sidebar to continue debugging.
Key features
- 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