Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.CIPv6 ReadinessActionNo IPv6 supportREVIEW
IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.
No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.
Source: Google IPv6 stats
BCrawlabilityrobots.txt present, no sitemapREVIEW
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
Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.
robots.txt omits Sitemap: directive — crawlers must fetch /sitemap.xml by convention; reliable but missing the explicit hint.
Source: sitemaps.org
User-agent: *
Disallow: /_resources/includes/
Disallow: /_resources/ou/
# Sitemap: https://www.sdsu.edu/sitemap.xml
No sitemap found
Adding a sitemap helps search engines discover your pages.
BURL Variantswww/non-www, trailing slash, HTTP→HTTPSREVIEW
www / non-www
Inconsistent — duplicate content risk
HTTP → HTTPS
Consistent
BTLS Certificate Expiry & Recommendations324 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, 83 ms lookupPASS
| A | 104.20.12.66 |
| AAAA | — |
| CNAME | — |
| NS | ns02.sdsu.edu, ns01.sdsu.edu |
| MX | 10 mxb-009b9c01.gslb.pphosted.com 10 mxa-009b9c01.gslb.pphosted.com |
| TXT | dell-technologies-domain-verification=sdsu.edu_99e6fd3a-69c3-4450-8288-4892d5a7d... jamf-site-verification=1k6X_gIWkA1rgGo0T7mbXQ atlassian-domain-verification=QHMkCJr62sGhGLoykU9d7D8hciIv2mPBdrZhG1qx1et9jXtKfe... brevo-code:b1414e0a234265a2faa294058248ae06 openai-domain-verification=dv-DmYzqJwQSQ98fp47vrgmDrg6 teamviewer-sso-verification=8e2fd763b26842fbaa077746436dcb2e read-ai-verification = 0199e52c-d423-712b-8503-05f8291baa17 autodesk-domain-verification=BNV4av0GRPwL8bOnmSbw SPF v=spf1 include:_spf.google.com include:_spf2.sdsu.edu include:_spf3.sdsu.edu inc... 00DF00000007EVl=1TBPL00000000Mb adobe-sign-verification=f90b78813ea85a56a64f9271be170251 adobe-idp-site-verification=7ca634bd-c1d9-49d3-8bcc-1e5f6186040c MS=ms42297913 MS=ms25063800 pardot238872=1f5b286cc8ef1eec02146f0c3e75bbb496908a00094ac2a87fdc83cfdf795085 smartsheet-site-validation=SCVPHKy1F38uD2zjMJDpJxWBry1VhoPG facebook-domain-verification=hflgnpr16afby8q6m8p5m0et5wyfke SFMC-COU69nqBETcp5Bnzw1Rijiv_lFBBlouF9B_Df6eW pardot886933=7d0a9bfa98bc738378206707cb0710bc9cf6bf5b44b245d86a8e2cfd7afffcf3 apple-domain-verification=fzMg6Q3joqoCeUdA 96150E68E4A243B2A02EA3D554D7AF3470F1533BFA0A006B5656E55D00FCCC03 apple-domain-verification=3jWSoDf3jpCe5iuw google-site-verification=DIYuNpHVWeVmthO3EOB4lgi0CgQBC6WJ-OoeVjbGkFc e2ma-verification=f7j3 |
| 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), 181 ms totalPASS
https://sdsu.edu
78 ms · HTTP/1.1
https://www.sdsu.edu/
103 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://sdsu.edu | 301 | 78 ms | HTTP/1.1 | cloudflare |
| 2 | https://www.sdsu.edu/ | 200 | 103 ms | HTTP/1.1 | cloudflare |
See the visual redirect chain in the HTTP Probe tab →
A+Domain Intelligencesdsu.edu — 40 years, 4 months old, hosted on CloudflarePASS
47 days
July 31, 2026
324 days
Issued by Internet2
40 years, 4 months
Registered July 10, 1986
Status unknown
Protects against DNS spoofing
Cloudflare
ASN AS13335
104.20.12.66
Registrar unknown
Expiry timeline
Recommended actions
- Renew the domain or enable auto-renewal to prevent accidental expiry