Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.BTLS Certificate Expiry & Recommendations56 days until leaf cert expires — 3 issues to addressREVIEW
Certificate validity
Recommended actions
- Submit your domain to hstspreload.org to be added to the Chrome preload list
- 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
BCDN & DeliveryCloudflareREVIEW
ADNS Records2 A records, 30 ms lookupPASS
| A | 104.17.184.120, 104.17.183.120 |
| AAAA | 2606:4700::6811:b878, 2606:4700::6811:b778 |
| CNAME | — |
| NS | — |
| MX | — |
| TXT | — |
| 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.
SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.
Without SPF, receiving servers can't validate sending IPs — your domain is easier to spoof in phishing.
Learn more ▾ ▴
SPF complements DMARC. Both should be published. SPF records list authorized sending IPs (e.g., `v=spf1 include:_spf.google.com ~all` for Google Workspace). After publishing, verify in Google Postmaster Tools or mxtoolbox.
Source: RFC 7208 (SPF)
A+Redirect Chain0 redirect(s), 72 ms totalPASS
https://www.codecademy.com
72 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://www.codecademy.com | 403 | 72 ms | HTTP/1.1 | cloudflare |
A+IPv6 ReadinessIPv6 reachable (17 ms)PASS
A+Crawlabilityrobots.txt present, sitemap with 12 URLsPASS
User-agent: *
Sitemap: https://www.codecademy.com/sitemap.xml
Disallow: /groups/
Disallow: /profiles/
Disallow: /intro-to-full-stack
Disallow: /beta-catalog
Disallow: /about/jobs
Disallow: /courses/
- https://www.codecademy.com/sitemap/artic...
- https://www.codecademy.com/sitemap/artic...
- https://www.codecademy.com/sitemap/bootc...
- https://www.codecademy.com/sitemap/catal...
- https://www.codecademy.com/sitemap/cheat...
- https://www.codecademy.com/sitemap/docs....
- https://www.codecademy.com/sitemap/exter...
- https://www.codecademy.com/sitemap/exter...
- https://www.codecademy.com/sitemap/paths...
- https://www.codecademy.com/sitemap/searc...
- https://www.codecademy.com/sitemap/track...
- https://www.codecademy.com/sitemap/video...
A+URL Variantswww/non-www, trailing slash, HTTP→HTTPSPASS
www / non-www
HTTP → HTTPS
Consistent
A+Domain Intelligencecodecademy.com — via CSC Corporate Domains, Inc., 14 years, 10 months oldPASS
EXPIRED
August 10, 2026
56 days
Issued by Google Trust Services
14 years, 10 months
Registered August 10, 2011
Not enabled
Protects against DNS spoofing
Unknown
2606:4700::6811:b778
CSC Corporate Domains, Inc.
Expiry timeline
Recommended actions
- Domain has EXPIRED — renew immediately to avoid total site outage
- Enable DNSSEC to protect visitors from DNS spoofing
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