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
BURL Variantswww/non-www, trailing slash, HTTP→HTTPSREVIEW
www / non-www
Inconsistent — duplicate content risk
HTTP → HTTPS
Consistent
BTLS Certificate Expiry & Recommendations235 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
ADNS Records4 A records, 1596 ms lookupPASS
| A | 18.238.243.32, 18.238.243.90, 18.238.243.124, 18.238.243.105 |
| AAAA | — |
| CNAME | — |
| NS | ns-1472.awsdns-56.org, ns-1753.awsdns-27.co.uk, ns-73.awsdns-09.com, ns-828.awsdns-39.net |
| MX | 1 aspmx.l.google.com 5 alt2.aspmx.l.google.com 5 alt1.aspmx.l.google.com 10 aspmx3.googlemail.com 10 aspmx2.googlemail.com |
| TXT | MS=ms75858894 MS=ms89770774 ZOOM_verify_L9I5Fxqkv63ZPy63F1sHvK adobe-idp-site-verification=0614d0e44da9d4b72a75d19e9138eb0052991fb2acb9d62cfd04... adobe-idp-site-verification=3f2215d19f499a970c4305a59755a6a1eb0f9850d7777a297a46... amazonses:0rz9BauM6+L1fwnDKUmS4nofo+8gZvTReGo5q/EliHY= apple-domain-verification=6VfkC2MXgvez6NHJ atlassian-domain-verification=HN7ngRpg8qAazURti1cdbKGDap2uVfm7uvUYF/m9UkSHtwZM2P... atlassian-domain-verification=xpq-aB5aXpxCKMr7r3eDPHyz+H8uPB16jIppdmlCIloVrhEtCr... atlassian-sending-domain-verification=5c0c6ccf-f137-44f4-8b59-90f8c09ba730 docusign=3b85e379-88dd-467e-a926-0b63f700d89a dropbox-domain-verification=9dvz1ju53nbf facebook-domain-verification=h2gg5zwnyax0dj0jyo4aafdtkpiiyu google-site-verification=-_Eevdy8NShzLkex28P2wC3zjbfVweCs0k5z5f6gm_k google-site-verification=3wMRITKQ9E2388ON5mfWt98s48OBDMVzPO-7xY3U6H4 google-site-verification=S98FBFJqeURQhHxBtC_UG84orCIkl7msuarSO5NoIPc google-site-verification=VmJhKMomzXGRq96pOMWst3QD0KvnurTNsPHNhv8qt1k google-site-verification=tVFyMKACOBTnEVoW-XJ0jbunNP7bDxPLxUZpGs9j9go hj-ownership=pzm3zqe*fhj7RQR3cpj pardot1059723=4defac72d9323b4f44f80b440e6eb91a8958b1f3b98bc585c494a8a5af62483e segment-site-verification=2ZGPEbxZ025BzXh516qCWeQ7sGFFltDx smartsheet-site-validation=bxOSD4ibPoym5apZEnln5bh2ckPn2Z1M SPF v=spf1 include:_u.edx.org._spf.smart.ondmarc.com ~all |
| 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.
Slow DNS adds latency to every page load. Consider a faster DNS provider.
DNS resolution is slow — anycast DNS providers (Cloudflare, Route 53) typically resolve <50ms globally.
Source: DNS performance benchmarks
ARedirect Chain1 redirect(s), 625 ms totalPASS
https://edx.org
286 ms · HTTP/1.1
https://www.edx.org/
339 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://edx.org | 301 | 286 ms | HTTP/1.1 | AmazonS3 |
| 2 | https://www.edx.org/ | 200 | 339 ms | HTTP/1.1 | cloudflare |
See the visual redirect chain in the HTTP Probe tab →
A+Crawlabilityrobots.txt present, sitemap with 9489 URLsPASS
User-agent: *
Clean-param: utm_source&utm_medium&utm_campaign&utm_term&utm_content&_rsc /
Allow: /misc/*.css$
Allow: /misc/*.css?
Allow: /misc/*.js$
Allow: /misc/*.js?
Allow: /misc/*.gif
Allow: /misc/*.jpg
Allow: /misc/*.jpeg
Allow: /misc/*.png
Allow: /modules/*.css$
Allow: /modules/*.css?
Allow: /modules/*.js$
Allow: /modules/*.js?
Allow: /modules/*.gif
Allow: /modules/*.jpg
Allow: /modules/*.jpeg
Allow: /modules/*.png
Allow: /profiles/*.css$
Allow: /profiles/*.css?
Allow: /profiles/*.js$
Allow: /profiles/*.js?
Allow: /profiles/*.gif
Allow: /profiles/*.jpg
Allow: /profiles/*.jpeg
Allow: /profiles/*.png
Allow: /themes/*.css$
Allow: /themes/*.css?
Allow: /themes/*.js$
Allow: /themes/*.js?
Allow: /themes/*.gif
Allow: /themes/*.jpg
Allow: /themes/*.jpeg
Allow: /themes/*.png
Disallow: /*?utm_source=*
Disallow: /*?utm_medium=*
Disallow: /*?utm_campaign=*
Disallow: /*?utm_term=*
Disallow: /*?utm_content=*
Disallow: /*?_rsc=*
Disallow: /includes/
Disallow: /misc/
Disallow: /modules/
Disallow: /profiles/
Disallow: /scripts/
Disallow: /themes/
Disallow: /preview/
Disallow: /es/preview/
Disallow: /secure-preview/
Disallow: /es/secure-preview/
Disallow: /wp-preview/
Disallow: /new/
Disallow: /es/new/
Disallow: /es/learn/*
Disallow: /es/bachelors/*
Disallow: /es/masters/*
Disallow: /es/certificates/*
Disallow: /es/executive-education/*
Disallow: /es/school/*
Disallow: /es/xseries/*
Disallow: /es/bio/*
Disallow: /auth/*
Disallow: /es/auth/*
Disallow: /authx/*
Disallow: /es/authx/*
Crawl-delay: 10
Sitemap: https://www.edx.org/sitemap.xml
A+Domain Intelligenceedx.org — via Amazon Registrar, Inc., 24 years, 8 months old, hosted on AWSPASS
136 days
November 25, 2026
235 days
Issued by Amazon
24 years, 8 months
Registered November 25, 2001
Not enabled
Protects against DNS spoofing
AWS
ASN AS16509
52.222.136.89
Amazon Registrar, 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