Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.BURL Variantswww/non-www, trailing slash, HTTP→HTTPSREVIEW
www / non-www
HTTP → HTTPS
HTTP version does not redirect to HTTPS
BTLS Certificate Expiry & Recommendations87 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
A+DNS Records2 A records, 90 ms lookupPASS
| A | 104.17.183.120, 104.17.184.120 |
| AAAA | 2606:4700::6811:b878, 2606:4700::6811:b778 |
| CNAME | — |
| NS | serena.ns.cloudflare.com, arnold.ns.cloudflare.com |
| MX | 5 codecademy-com.mail.protection.outlook.com |
| TXT | google-site-verification=BB5unuHbdt4pYsHrMorf_R-mKcUdy5Bk2vvz0Ie_q44 Mosyle-verification-1750951629 google-site-verification=H0SayPMoRT_4rzjNrg2YvbxiRvQbqSTlwSM0D0wht8U google-site-verification=M2VbalsxRQjMfelTnHdpgHIeqOKE6CYWnhj6VbGMFH8 v=DKIM1; p= facebook-domain-verification=mm5a3aemk4cv9yfjikcr4de2xn0ait figma-domain-verification=8c0a9ebe2f3a594d9d85faed8994ef2b073a992b28ea6a3e9fa3dc... apple-domain-verification=6j9Dh5BuEBtMWMMg MS=ms80117904 MS=79764F463C8CD2E367B5BF7B1DF1B1C9FFE48501 SPF v=spf1 include:customeriomail.com include:mail.zendesk.com include:_spf.google.c... google-site-verification=dqlGjeLuQLofS51hgFB6ptoJWM0EkcPoe7G1gmL9muw google-site-verification=BAzjINWd55GJVC7I66cdi0SXSLENbMENU9tqByphDmQ google-site-verification=vIdZhswzF-KMQmIllHFhS6VnmeHUvsCKTccrXjab-Lw segment-site-verification=NJFFQLAhEEX3Uyz0vgrzNf3fplm6iYsg google-gws-recovery-domain-verification=57013633 google-site-verification=wkpord_VFYRlAcjf2hV21FHnsScCpA9YiMOQqACXsvQ google-site-verification=0pRbsGszBlAjZisxsJ2qJLXoXIKCdDlCSK_67hy5BjY openai-domain-verification=dv-RFgs6gJx1YSwFBosC1y2RA1n atlassian-domain-verification=m7Ac1Hv/T4ePJa3hgcqMgYHykrG65YAE+oy9aqlN+aDA0khgC0... google-site-verification=1pIE7oxQFgbaSths1CckFlGEYBHxpp5pD9F_ZUCcSVA |
| 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+Redirect Chain0 redirect(s), 61 ms totalPASS
https://codecademy.com
61 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://codecademy.com | 403 | 61 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+Domain Intelligencecodecademy.com — via CSC Corporate Domains, Inc., 14 years, 10 months oldPASS
28 days
August 10, 2026
87 days
Issued by Google Trust Services
14 years, 10 months
Registered August 10, 2011
Not enabled
Protects against DNS spoofing
Unknown
2606:4700::6811:b878
CSC Corporate Domains, Inc.
Expiry timeline
Recommended actions
- Renew the domain or enable auto-renewal to prevent accidental expiry
- 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