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https://www.udemy.com

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
95
GRADE
A
FIX
0
REVIEW
2
PASS
7
INFO
0
Probed from Madrid, Spain
200 OK
Checks
9
7 PASS 2 REVIEW
B
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
REVIEW
www/non-www, trailing slash, HTTP→HTTPS
Info::
www/non-www redirect configured correctly (preferred: www)
Critical::
HTTP version does not redirect to HTTPS
Got: HTTP 403 Expected: 301 redirect to HTTPS

www / non-www

200https://www.udemy.com/
301https://udemy.com/

Preferred variant: www

HTTP → HTTPS

403http://www.udemy.com/

HTTP version does not redirect to HTTPS

B
TLS Certificate Expiry & Recommendations
87 days until leaf cert expires — 2 issues to address
REVIEW

Certificate validity

87
days left
0d 30d 60d 90d+

Recommended actions

  • Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
  • Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
A+
DNS Records
2 A records, 34 ms lookup
PASS
2 A records, 34 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 104.16.143.237, 104.16.142.237
Info::
Has 2 IPv6 (AAAA) record(s)
Got: 2606:4700::6810:8eed, 2606:4700::6810:8fed
Info::
No NS records found
Info::
No MX records — email not configured via DNS
Info::
CAA records not checked
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Info::
SPF record present in TXT
Info::
DNS resolution time: 34 ms
Got: 34 ms
A104.16.143.237, 104.16.142.237
AAAA2606:4700::6810:8eed, 2606:4700::6810:8fed
CNAME—
NS—
MX—
TXT
globalsign-domain-verification=K9ZBZYNiNsNNOiaY2Tbjn-Bfe0dWwAwpstKoOOVJWO
SPF v=spf1 include:spf-default.udemy.com -all
_globalsign-domain-verification=9UioyPO0_F2Epyd3gGV5_VklXzoibTukD_jkbZPw43
CAALookup not available with standard resolver
Resolved in 34 ms

CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.

Why this matters

Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.

A+
Redirect Chain
No redirects — direct access
PASS
No redirects — direct access
Info::
No redirects — direct access
Got: https://www.udemy.com

https://www.udemy.com

96 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://www.udemy.com20096 msHTTP/1.1cloudflare
A+
IPv6 Readiness
IPv6 reachable (17 ms)
PASS
IPv6 reachable (17 ms)
Info::
IPv6 is configured and reachable at 2606:4700::6810:8eed, 2606:4700::6810:8fed
Got: 17 ms connect
IPv6 Ready
AAAA Records 2606:4700::6810:8eed, 2606:4700::6810:8fed Connection Reachable (17 ms)
A+
Crawlability
robots.txt present, sitemap with 4128 URLs
PASS
robots.txt present, sitemap with 4128 URLs
Info::
robots.txt is present
Got: 1493 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 4128 entries
Info::
Sitemap index with 4128 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 1493 B Sitemaps referenced 1 User-agents Baiduspider, LinkedInBot, * Blocking No — crawling allowed
#2026-03-16: Allow Baidu but limit crawl frequency
User-agent: Baiduspider
Crawl-delay: 10

#Allow LinkedIn only to see completion certificates
User-agent: LinkedInBot
Allow: /certificate/

#2026-03-16: Fix faceted URL wildcard, remove redundancies.
User-Agent: *
Disallow: /404/
Disallow: /*?
Disallow: /api-2.0/
Disallow: /api/
Disallow: /buy/
Disallow: /cart/
Disallow: /category/
Disallow: /certificate/
Disallow: /collection/
Disallow: /course/reviews-popup/
Disallow: /curated/
Disallow: /dashboard/
Disallow: /draft/
Disallow: /forums/
Disallow: /gift/
Disallow: /guides/
Disallow: /home/
Disallow: /lecture/
Disallow: /lectures/
Disallow: /lesson/
Disallow: /live-session/
Disallow: /lp/
Disallow: /message/
Disallow: /mobile/
Disallow: /new-lecture/
Disallow: /payment/
Disallow: /person/
Disallow: /series/
Disallow: /share/
Disallow: /static/
Disallow: /support/
Disallow: /tag/
Disallow: /tools/
Disallow: /u/
Disallow: /user/view-popup/
Disallow: /wanted/
Disallow: /*wp-admin/
Disallow: /api-2.0/recommended-courses

#2026-03-16: Allow pagination facets
Allow: /api-2.0/contexts/me/
Allow: /api-2.0/course-categories
Allow: /api-2.0/course-landing-components
Allow: /api-2.0/course-subcategories
Allow: /api-2.0/courses/
Allow: /api-2.0/discovery-units
Allow: /api-2.0/pricing
Allow: /api-2.0/structured-data
Allow: /api-2.0/tags
Allow: /api/2022-03/graphql/
Allow: /api/2024-01/graphql
Allow: /*?p=

#2026-03-16: Cross-link to sitemap
Sitemap: https://www.udemy.com/sitemap.xml
sitemap.xml 200 OK
Type Sitemap Index URLs 4128 entries Valid XML Yes
Child Sitemaps:
A+
Domain Intelligence
udemy.com — via SafeNames Ltd., 16 years, 10 months old
PASS
udemy.com — via SafeNames Ltd., 16 years, 10 months old
Info::
Domain registered until Aug 13, 2027 (1 years, 4 months remaining)
Info::
DNSSEC is enabled
Info::
Registrar: SafeNames Ltd.
Domain expiry

362 days

August 13, 2027

SSL certificate

87 days

Issued by Let's Encrypt

Domain age

16 years, 10 months

Registered August 13, 2009

DNSSEC

Enabled

Protects against DNS spoofing

Hosting

Unknown

2606:4700::6810:8fed

Registrar

SafeNames Ltd.

Lock status unknown 2 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Registrar SafeNames Ltd.
Created August 13, 2009 (16 years, 10 months ago)
Expires August 13, 2027 (1 years, 4 months)
Last Updated September 1, 2025
Name Servers anna.ns.cloudflare.com, pete.ns.cloudflare.com
DNSSEC Enabled
Hosting
IP Address 2606:4700::6810:8fed
Data source: rdap (0.1s)
A+
HTTP Probe Timing
Total 141 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
32 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
17 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
22 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
137 ms
Total Time Total request time from DNS lookup through full response.
142 ms

Connection waterfall

DNS Lookup 32 ms TCP Connect 17 ms TLS Handshake 22 ms Server Processing 66 ms Content Transfer 5 ms
A+
CDN & Delivery
Cloudflare (HIT)
PASS
Cloudflare (HIT)
Info::
Site is served via Cloudflare CDN (edge: CDG)
Got: cf-ray: 9e8bb0dfe861f4e7-CDG
Info::
CDN cache status: HIT
CDN Detected: Cloudflare
Provider Cloudflare Cache Status HIT Evidence cf-ray: 9e8bb0dfe861f4e7-CDG
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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