Protocol audit
0.86.74.109 HTTP/2 test
SEO page with a cached HTTP/2, ALPN and TLS negotiation check.
Something went wrong
private, local, or reserved network targets are not allowed
Tool switcher
Continue with another check
Same target (0.86.74.109) — open the next tool without retyping.
- Browser Update CheckerBrowser version, update status and Client HintsOpen
- HTTP Header CheckerSame targetResponse headers, redirects and caching0.86.74.109Open
- Domain IP LookupSame targetA and AAAA IP addresses for a domain0.86.74.109Open
- SSL Certificate CheckerSame targetCertificate chain, SAN and TLS version0.86.74.109Open
- DNS CheckerSame targetAll major record types in one pass0.86.74.109Open
- DIGSame targetOne record type, resolver-style answer0.86.74.109Open
- WHOISSame targetRegistrar, expiry and domain status0.86.74.109Open
- Blacklist CheckerSame targetDNSBL reputation for IP and domain0.86.74.109Open
- Punycode ConverterUnicode ↔ Punycode for IDN domainsOpen
- URL SplitterSame targetBreak a URL into parts and query paramshttps://0.86.74.109/Open
- IP CalculatorSame targetSubnet math for IPv4 and IPv6 CIDR0.86.74.109Open
- Base64 CodecEncode and decode Base64 textOpen
- Password GeneratorStrong random passwords for ops workOpen
- Password Strength CheckerEntropy, crack time and password suggestionsOpen
- Passphrase GeneratorMemorable random word phrases for safer sharing testsOpen
- BIN CheckerSame targetCard brand, bank and country from BIN/IIN08674109Open
- Domain Age CheckerSame targetCreation date, age, registrar and expiry0.86.74.109Open
- DMARC AnalyzerSame targetDMARC policy, alignment and reporting checks0.86.74.109Open
Guides
Related articles
Practical guides for common HTTP/2 Tester tasks — DNS records, troubleshooting steps, and links to our free tools.
http2 detection, check http/2 support, http2 tester
HTTP/2 Detection Guide for Production Sites
How to confirm HTTP/2 support, read protocol results, and avoid false positives from cached or proxied checks.
Read article →ALPN HTTP/2, h2 negotiation, TLS ALPN check
ALPN and HTTP/2 Negotiation Explained
Why ALPN decides whether clients use h2, and how to troubleshoot missing protocol negotiation.
Read article →HTTP/2 TLS requirements, h2 TLS, HTTP/2 certificate check
HTTP/2 TLS Requirements Checklist
Practical TLS requirements for reliable HTTP/2 support on public websites and APIs.
Read article →h2 vs http/1.1, HTTP/2 vs HTTP/1.1, HTTP protocol comparison
h2 vs HTTP/1.1: What the Tester Result Means
How to interpret h2 and HTTP/1.1 results for web performance, compatibility, and debugging.
Read article →HTTP/2 CDN issues, HTTP/2 proxy, CDN h2 origin
HTTP/2 CDN and Proxy Issues to Check First
Common CDN, reverse proxy, and load balancer reasons that HTTP/2 works at one layer but fails at another.
Read article →browser HTTP/2 mismatch, server h2 mismatch, HTTP/2 browser check
Browser and Server HTTP/2 Mismatch: How to Debug
Why browser devtools and server checks may disagree about HTTP/2, and how to find the real protocol path.
Read article →nginx HTTP/2 config, Apache HTTP/2 config, Caddy HTTP/2 check
Nginx, Apache, and Caddy HTTP/2 Config Checks
Configuration checkpoints for enabling HTTP/2 safely on common web servers.
Read article →HTTP/2 SEO, HTTP/2 performance, h2 page speed
HTTP/2 SEO and Performance Impact
How HTTP/2 support affects crawl efficiency, user experience, and page speed diagnostics.
Read article →