Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.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.
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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 & Recommendations52 days until leaf cert expires — 3 issues to addressREVIEW
Certificate validity
Recommended actions
- Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
- 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 Records1 A records, 19 ms lookupPASS
| A | 23.185.0.1 |
| AAAA | 2620:12a:8001::1, 2620:12a:8000::1 |
| CNAME | — |
| NS | ns-1127.awsdns-12.org, ns-1733.awsdns-24.co.uk, ns-415.awsdns-51.com, ns-797.awsdns-35.net |
| MX | 1 aspmx.l.google.com 5 alt2.aspmx.l.google.com 5 alt1.aspmx.l.google.com 10 alt3.aspmx.l.google.com 10 alt4.aspmx.l.google.com |
| TXT | 2jr4cb9p4ctf5ymtz4xlp0l4gb0vg304 MS=ms35793585 anthropic-domain-verification-89d5jf=wtjF67F1Bl4WiWz6KdSx0rlc3 apple-domain-verification=GokUpgoQLiVO1pMb apple-domain-verification=NU1EKMj8yRHxSeqsWIQfl9VpEGdpZx2vlPx-C4ivpdw atlassian-sending-domain-verification=c0020406-7682-4113-8329-295cb6db900e google-site-verification=iLMRS8mQyaUFUd1wTpE5XZGQYcBPUADJOwcMsoN6Ei0 google-site-verification=nGJ4sbjTlz5bYzlOuef2xiUW1U1066O-Mmhu3QTuys0 include:spf.mandrillapp.com ~all SPF v=spf1 include:_spf.google.com include:_spf.salesforce.com include:_spf.atlassia... |
| CAA | Lookup not available with standard resolver |
Multiple A records provide failover if one server goes down.
Single A record means a single point of failure — if that IP goes down, your site is unreachable until DNS TTL expires.
Learn more ▾ ▴
Add multiple A records for round-robin failover, or use a managed DNS provider with health-checked failover (Route 53, Cloudflare, NS1). Short TTL (60-300s) lets clients recover faster on outages.
Source: SRE practice / DNS architecture
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.
ARedirect Chain1 redirect(s), 309 ms totalPASS
https://exploratorium.edu
167 ms · HTTP/1.1
https://www.exploratorium.edu/
141 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://exploratorium.edu | 301 | 167 ms | HTTP/1.1 | Pantheon |
| 2 | https://www.exploratorium.edu/ | 405 | 141 ms | HTTP/1.1 | CloudFront |
See the visual redirect chain in the HTTP Probe tab →
A+IPv6 ReadinessIPv6 reachable (1 ms)PASS
A+URL Variantswww/non-www, trailing slash, HTTP→HTTPSPASS
www / non-www
HTTP → HTTPS
Consistent
A+Domain Intelligenceexploratorium.edu — 34 years, 4 months oldPASS
379 days
July 31, 2027
52 days
Issued by Let's Encrypt
34 years, 4 months
Registered May 28, 1992
Status unknown
Protects against DNS spoofing
Unknown
2620:12a:8001::1
Registrar unknown