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https://udemy.com

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
94
GRADE
A
FIX
0
REVIEW
3
PASS
6
INFO
0
Probed from Sao Paulo, Brazil
301 Moved Permanently
Checks
9
6 PASS 3 REVIEW
B
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
REVIEW
www/non-www, trailing slash, HTTP→HTTPS
Critical::
Both www and non-www versions serve content
Got: Both variants return 200 Expected: One variant 301-redirects to the other
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

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

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://udemy.com/ → https://www.udemy.com/

Consistent

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

Certificate validity

79
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
B
CDN & Delivery
Cloudflare
REVIEW
Cloudflare
Info::
Site is served via Cloudflare CDN (edge: GRU)
Got: cf-ray: 9eceb61fa99bdf6c-GRU
CDN Detected: Cloudflare
Provider Cloudflare Evidence cf-ray: 9eceb61fa99bdf6c-GRU
A+
DNS Records
2 A records, 14 ms lookup
PASS
2 A records, 14 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::6810:8fed, 2606:4700::6810:8eed
Info::
2 nameserver(s) configured
Got: anna.ns.cloudflare.com, pete.ns.cloudflare.com
Info::
7 mail exchanger(s) configured
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: 14 ms
Got: 14 ms
A104.16.143.237, 104.16.142.237
AAAA2606:4700::6810:8fed, 2606:4700::6810:8eed
CNAME—
NSanna.ns.cloudflare.com, pete.ns.cloudflare.com
MX
1 aspmx.l.google.com
5 alt1.aspmx.l.google.com
5 alt2.aspmx.l.google.com
10 alt4.aspmx.l.google.com
10 aspmx3.googlemail.com
10 alt3.aspmx.l.google.com
10 aspmx2.googlemail.com
TXT
MS=ms39886121
_nbghqs48lzt0emavhip5o2dyy5kb0xy
apple-domain-verification=MntOsncD5C5BxosV
docusign=206e891a-5b22-4d4c-9a10-85066ba89160
docusign=d078f828-536c-4ce3-a867-b26ad811bb8a
jamf-site-verification=L9yfsaaKM7FxdBtc5kWk6g
canva-site-verification=Ng9bmmu7vJyWHYrTk_wUZw
cloudhealth=8d6a3d7f-ed91-4280-8422-b4b27b3dfcda
openai-domain-verification=dv-ncbISx7kF83lZ69Xc97AoraD
loom-site-verification=f173ba1cc44648d0ac2bbd0919868a6b
miro-verification=f165badb21a511b048a7f7a9fba3352c0db8b09b
cursor-domain-verification-pae8cg=8gFowcF4OpBSeYJTIw0GYPFvL
twilio-domain-verification=8e64b1bb044ab98ebbd3638c1babb25a
citrix-verification-code=6b798901-86c6-452c-a3ea-ed718cab39bd
onetrust-domain-verification=2a6df466515246c4a7c37104f55a82b8
pendo-domain-verification=595ba9d5-03ac-4aee-b50f-168214b6a32a
zero-path-domain-verification-6e9hdw=BtrY4vZKLJdp2XlFj1sE4FFVG
google-site-verification=0Gl3_FzqmUkS2NHg_Wd5pmGiSmt_Jk4MVnaCiDbhDnY
google-site-verification=4E_wLzpH4XLGfUSem4QVA6mUpRJDjvZ03pG1jU56hNM
google-site-verification=Ca1sgMRin5VW1yxjUntivQ3-RySo8SmJcWR6zgFW_w0
google-site-verification=FZsUD-xuwip73XO7XfuX-4kDEY-_Qel0klHmmu6CB5k
google-site-verification=IKMJeRfamsooHAMaTQdFDaQ4MsfeW1Nr6F7DPDEkycg
google-site-verification=RuYIvfeP5e2eBgQzIaky9XuiCkkrVE2KUBULndTtFE4
google-site-verification=c7RTHsaBu_LU5KgIFuPCWa5yxuTrkOGYtKaYt85mrq8
google-site-verification=lKnsAORvM6iM1XErS9RH0TeVGG7VfTb5ST7PGx1AQ-w
google-site-verification=ld8CL_RjIj_FPsIdElHPqkhOMJ8Rixk1y7-s0Opi-90
google-site-verification=mSmGycRVFusrCec4blSh608oUai-y0AumEuI3OlaGBo
apple-domain-verification=IEscmDl7jHBZDO_dBAG0xMjbBbPxomU_9rqwksKrNmk
globalsign-domain-verification=Bo6R5k9s2Zwdk5OoeybGk6L2EHx_oV1TqLgGiMR4IQ
globalsign-domain-verification=K9ZBZYNiNsNNOiaY2Tbjn-Bfe0dWwAwpstKoOOVJWO
globalsign-domain-verification=fB1XzR_1Hvbw32pP6EbLFlB9r4pxcc86XOgA7B7DyV
_globalsign-domain-verification=9UioyPO0_F2Epyd3gGV5_VklXzoibTukD_jkbZPw43
_globalsign-domain-verification=oJsQtL3M8axaRGjlRJ4BstY+1TfWDryoeAouwRxay7A=
prowly-verification=bebd281d32a3e1b8140345e1f876f82eff2ba617d782c6206e7c21fd9fdb...
stripe-verification=044c7ed24abd68184b0a86b00dbd47b87d1db3a5eb2ee132df5131bfc6fe...
stripe-verification=4d955ddab5b0fc6cf1931b41935e45f7997f3b13677532d11e6a90b58f51...
stripe-verification=54fa1ebf13b6990c87e17caffc4829d9600d3bd0ca60b24e6bf9ae530baf...
stripe-verification=5808adfa0c91e8dfe4ecd14f20c22ba0d54b6e8b71b23a5eada978511a24...
stripe-verification=8ad760d1d60c9bbd83b03ed7fe20a10682f7d65774aa9db13a0b524e51ce...
stripe-verification=a4f63d60cd50bfe9f3b2c2d8aa55bc596a98ab6e0f0f2e9d798c6939ece9...
stripe-verification=e006b01ab77ebbe2e6c509a4e2280540bfea979f8c49ed3efd225004aa2f...
stripe-verification=e2909d7f06f271e18ace56ef06db7b552e6692c312adfedaf6cea1a2e0d6...
adobe-idp-site-verification=e54c98a1c7f23b54b8ac4b7b75952259c173d7bfba731f72db60...
atlassian-domain-verification=YpSV2agr6k+w5lkm2ml8m8/N+xCTPcXjTKwDomeoJJTrgnmCoe...
atlassian-domain-verification=iztR9OQCHGIVBm5w5PmFPf1nTaqiOROSuNTF9Kv0idnfzCBmAs...
SPF v=spf1 include:_spf.google.com include:mktomail.com include:spf.mtasv.net includ...
CAALookup not available with standard resolver
Resolved in 14 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
1 redirect(s), 97 ms total
PASS
1 redirect(s), 97 ms total
Info::
Single redirect
Got: https://udemy.com → https://www.udemy.com/ (301)
Info::
WWW normalization redirect

https://udemy.com

25 ms · HTTP/1.1

301

https://www.udemy.com/

72 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://udemy.com30125 msHTTP/1.1cloudflare
2https://www.udemy.com/20072 msHTTP/1.1cloudflare

See the visual redirect chain in the HTTP Probe tab →

A+
IPv6 Readiness
IPv6 reachable (1 ms)
PASS
IPv6 reachable (1 ms)
Info::
IPv6 is configured and reachable at 2606:4700::6810:8fed, 2606:4700::6810:8eed
Got: 1 ms connect
IPv6 Ready
AAAA Records 2606:4700::6810:8fed, 2606:4700::6810:8eed Connection Reachable (1 ms)
A+
Crawlability
robots.txt present, sitemap with 4148 URLs
PASS
robots.txt present, sitemap with 4148 URLs
Info::
robots.txt is present
Got: 1493 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 4148 entries
Info::
Sitemap index with 4148 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 4148 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.
Warning::
Registrar lock is NOT enabled
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.
Domain expiry

397 days

August 13, 2027

SSL certificate

79 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::6810:8eed

Registrar

SafeNames Ltd.

Unlocked 2 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
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::6810:8eed
Data source: rdap (0.4s)

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.

Why this matters

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

A+
HTTP Probe Timing
Total 21 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
3 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
2 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
8 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
22 ms
Total Time Total request time from DNS lookup through full response.
22 ms

Connection waterfall

DNS Lookup 3 ms TCP Connect 2 ms TLS Handshake 8 ms Server Processing 9 ms Content Transfer 0 ms
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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