Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.BRedirect Chain2 redirect(s), 423 ms totalREVIEW
https://thunderbird.net
64 ms · HTTP/1.1
https://www.thunderbird.net/
271 ms · HTTP/1.1
https://www.thunderbird.net/en-US/
88 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://thunderbird.net | 302 | 64 ms | HTTP/1.1 | cloudflare |
| 2 | https://www.thunderbird.net/ | 302 | 271 ms | HTTP/1.1 | cloudflare |
| 3 | https://www.thunderbird.net/en-US/ | 200 | 88 ms | HTTP/1.1 | cloudflare |
See the visual redirect chain in the HTTP Probe tab →
Each redirect adds latency. Try to minimize the chain to 1 hop.
Redirect chain — each hop adds latency; combine into one redirect where possible.
Source: Google Search Central / web.dev
If permanent, use 301 instead.
302 (Found) is for genuinely temporary redirects — if this redirect is permanent, switch to 301 to preserve SEO equity.
Learn more ▾ ▴
Search engines treat 302 as temporary, keeping the original URL indexed and not transferring full link equity to the destination. Use 301 (Moved Permanently) for permanent redirects (HTTP→HTTPS, www-vs-non-www, URL restructures).
Source: Google Search Central
BCrawlabilityno robots.txt, no sitemapREVIEW
robots.txt is optional but recommended. It tells search engine crawlers which pages to index.
No robots.txt — crawlers fetch /robots.txt and get 404; not breaking but means default crawl behavior with no directives or sitemap reference.
Learn more ▾ ▴
A minimal robots.txt with `User-agent: * / Allow: / / Sitemap: https://example.com/sitemap.xml` covers the basics. Without it, crawlers behave fine but lose the sitemap signal and can't be selectively blocked from crawl-traps.
Source: robotstxt.org
A sitemap helps search engines discover and index your pages more efficiently.
No sitemap.xml — Google relies on crawl-graph discovery alone, slowing indexing of deep or fresh URLs.
Learn more ▾ ▴
A sitemap accelerates Google's discovery of new and updated content. Most CMSes auto-generate one; static-site frameworks need a build-step plugin. Reference it from robots.txt and submit in Search Console to confirm Google can fetch it.
Source: sitemaps.org / Google Search Central
No robots.txt found
This is fine for most sites — a missing robots.txt allows all crawling by default.
No sitemap found
Adding a sitemap helps search engines discover your pages.
BTLS Certificate Expiry & Recommendations63 days until leaf cert expires — 4 issues to addressREVIEW
Certificate validity
Recommended actions
- Add includeSubDomains to the HSTS directive
- Add the preload directive and submit to hstspreload.org once max-age + includeSubDomains are in place
- Enable DNSSEC on your domain for DNS spoofing protection
- Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
A+DNS Records2 A records, 30 ms lookupPASS
| A | 172.66.166.3, 104.20.26.187 |
| AAAA | 2606:4700:10::ac42:a603, 2606:4700:10::6814:1abb |
| CNAME | — |
| NS | kia.ns.cloudflare.com, nick.ns.cloudflare.com |
| MX | 1 aspmx.l.google.com 5 alt2.aspmx.l.google.com 5 alt1.aspmx.l.google.com 10 alt4.aspmx.l.google.com 10 alt3.aspmx.l.google.com |
| TXT | google-site-verification=mMSFIliLussedqJxSXwL44h9_uxu7A9-oWoy5GQ6TUg atlassian-domain-verification=8xkMty0tOT0eog0PN17DvoBgD4NC/3/j/Tkx6tRZN5Zl15VBEF... notion-domain-verification=CTJ2GxP5qpUZsOatCxmocIYuUHiXe1V8HTyXcPbZVyG anthropic-domain-verification-w18gaf=RZ86dJ1s9VT14VNvpmHAwfRqE remote-domain-verification=cf65a23c-16ed-4181-8ee9-2bc2741130d5 MS=ms81336502 1password-site-verification=IHO4WARAQFFLXDHZB56XZF2PHA google-site-verification=KxD-jprWeu5RCryeejJ2IQLYKLAknHRyd9UouCx3qj0 SPF v=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email include:spf.messagingeng... z5k29igncd google-site-verification=96iXS_8P8qP6DhVQz3lTKDZqKDpvv2TIzJfiFmVBGXc 14956136 apple-domain-verification=pzjYlsoA8s7Ha71Q |
| CAA | Lookup not available with standard resolver |
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.
A+IPv6 ReadinessIPv6 reachable (17 ms)PASS
A+URL Variantswww/non-www, trailing slash, HTTP→HTTPSPASS
www / non-www
Preferred variant: non-www
HTTP → HTTPS
Consistent
A+Domain Intelligencethunderbird.net — via MarkMonitor Inc., 24 years, 2 months oldPASS
314 days
May 28, 2027
63 days
Issued by Google Trust Services
24 years, 2 months
Registered May 28, 2002
Not enabled
Protects against DNS spoofing
Unknown
2606:4700:10::6814:1abb
MarkMonitor Inc.
Expiry timeline
Recommended actions
- Enable DNSSEC to protect visitors from DNS spoofing
- Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.
Without DNSSEC, an attacker who can poison your DNS can hijack your domain — and SSL certs alone don't stop them.
Learn more ▾ ▴
DNSSEC adds cryptographic signatures to DNS records, preventing forged responses from poisoning resolver caches. Without it, an attacker who controls the network path can redirect your domain to a malicious server before any HTTPS handshake happens. Most modern registrars (Cloudflare, Google Domains, Route 53) enable it with one toggle.
Source: ICANN / RFC 4033
The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.
Without registrar lock, an attacker who phishes your registrar credentials can transfer the domain in minutes — total brand hijack.
Learn more ▾ ▴
Registrar lock (clientTransferProhibited, clientUpdateProhibited, clientDeleteProhibited) requires extra verification before any transfer/update/delete. Every major registrar offers it free. Combined with 2FA on your registrar account, it's the strongest defense against domain hijacking.
Source: ICANN / domain-security best practice