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https://teachable.com

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
86
GRADE
B
FIX
0
REVIEW
4
PASS
5
INFO
0
Probed from Madrid, Spain
301 Moved Permanently
Checks
9
5 PASS 4 REVIEW
C
IPv6 Readiness
Action
No IPv6 support
REVIEW
No IPv6 support
Info::
No IPv6 (AAAA) records found
IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.
No IPv6 Support
About 40% of internet users have IPv6. Consider adding AAAA records.

IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.

Why this matters

No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.

Source: Google IPv6 stats

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.teachable.com/
200https://teachable.com/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://teachable.com/ → https://teachable.com/

Consistent

B
TLS Certificate Expiry & Recommendations
69 days until leaf cert expires — 4 issues to address
REVIEW

Certificate validity

69
days left
0d 30d 60d 90d+

Recommended actions

  • Add includeSubDomains to the HSTS directive
  • Add the preload directive and submit to hstspreload.org once max-age + includeSubDomains are in place
  • 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
B
CDN & Delivery
Cloudflare (BYPASS)
REVIEW
Cloudflare (BYPASS)
Info::
Site is served via Cloudflare CDN (edge: MAD)
Got: cf-ray: 9effb006d9c20325-MAD
Info::
CDN cache status: BYPASS
CDN Detected: Cloudflare
Provider Cloudflare Cache Status BYPASS Evidence cf-ray: 9effb006d9c20325-MAD
A+
DNS Records
1 A records, 93 ms lookup
PASS
1 A records, 93 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 198.202.211.1
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
No IPv6 (AAAA) records
Info::
2 nameserver(s) configured
Got: nina.ns.cloudflare.com, ian.ns.cloudflare.com
Info::
5 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: 93 ms
Got: 93 ms
A198.202.211.1
AAAA—
CNAME—
NSnina.ns.cloudflare.com, ian.ns.cloudflare.com
MX
1 aspmx.l.google.com
5 alt2.aspmx.l.google.com
5 alt1.aspmx.l.google.com
10 alt4.aspmx.l.google.com
10 alt3.aspmx.l.google.com
TXT
google-site-verification=ow9HKkznXRHS4XhYL1Gfab5TQRz15gZbTczSInjX7ZU
asv=c51ca35fbb7757e5a6f0189deab2fb58
google-site-verification=XxQdRDFEuE3ogqMfmEMZMnHTqg5KlNGF0Hos6fnaR-A
globalsign-domain-verification=vVNUJEiPJniKDdoWicJuKMf9V52-vb9KovoAIiiida
f2fnmke27g9bndg2f7de9bseh2
h1-domain-verification=xbXGwB1ZYgw5WHW5qfLj8zpYoYC2F7TX6ATcpReVWRrNeJGj
stripe-verification=99e5b79db397a21ae18c991ecf52712d9e16b18db57319c2dccf2f9104b4...
google-site-verification=zS47T5jl0nSkNVgu8qCmj87R8YIZ-9H5oQNfbwsXIt0
atlassian-domain-verification=a9zEXCx1WsxRai9qeugknkTX2TV2ZRFywviwa7VbszMrReqWCS...
ps-cd-verification=f8d92b21-825e-4b5d-9dcc-e78fdd5c1aea
zoom-domain-verification=c548cc54-1209-4bcc-929e-9aebef6e1ebb
stripe-verification=947db08420734c6564dbef86cd766deb88a724a9014d73900cf8ad125851...
MS=ms46309658
stripe-verification=6FD22B73E07DA0F1A55DE56B8AD7C3F286222B010A42F3CE40999F4B2EC2...
google-site-verification=xt5p8RRZL20KTDvpDiLVYmWfUO_VTyhuD9fz5vxtzZA
stripe-verification=1a64c5fdd4ee26490d82ef5ee20be2e13eeacfe52a411ba2be9442509f4a...
oacnl1dda6tcm54pe1mm0s7n4b
stripe-verification=dae8649612417f93f7c10abb4fb37a5be02d6a6e6ea56c03d577bd7c0c5d...
mgverify=fdb0e4ab358548550e996faf8ce8baa3935f2caee833d7408b5d89cb2b933549
ZOOM_verify_NG8JJfDLmTkqN4qjXE5DZh
facebook-domain-verification=b6jirvkk1tilh9t8e1q57bh6b12s5x
QuoVadis=feba1d66-ea2f-40c4-9681-143442022cab
google-site-verification=-lHHXk1MJFS7GNHGxz9HcrQ5Hrf_rXVpfbRP2J1wPyA
google-site-verification=lz55OpUkDlIAbssMq5j6w7Q3TImgYsatyg6Fws8fIkQ
miro-verification=fb5d52859a00082e01344fb4b074f7f6b2754326
apple-domain-verification=kcN2dcIuE6b07BgF
rt5kk15rl1b081jo9q65p4a62
SPF v=spf1 include:_spf.google.com include:mailgun.org include:mail.zendesk.com ip6:...
google-site-verification=KuUrdPRv6-JotHpZjJF7Tw8oKUdXDLolfB9C4k_qwSA
MS=ms78296269
proxy.webflow.com
atlassian-domain-verification=ESx5jS7H0NuVg0RqhI/1FhVKZnGfWOBfbjHRR+ll2Vc9gqeFZM...
firebase=teachable-webinar
A52B1579E6
google-site-verification=-dkPR93_MrFSt8aPZGAqIXul1EZpImnubVUphDThJDE
ambassador-portals-herokuapp
have-i-been-pwned-verification=e29ac28e032e14176264d184461fe34a
CAALookup not available with standard resolver
Resolved in 93 ms

Multiple A records provide failover if one server goes down.

Why this matters

Single A record means a single point of failure — if that IP goes down, your site is unreachable until DNS TTL expires.

Learn more ▾

Add multiple A records for round-robin failover, or use a managed DNS provider with health-checked failover (Route 53, Cloudflare, NS1). Short TTL (60-300s) lets clients recover faster on outages.

Source: SRE practice / DNS architecture

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), 324 ms total
PASS
1 redirect(s), 324 ms total
Info::
Single redirect
Got: https://teachable.com → https://www.teachable.com/ (301)
Info::
WWW normalization redirect

https://teachable.com

198 ms · HTTP/1.1

301

https://www.teachable.com/

126 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://teachable.com301198 msHTTP/1.1cloudflare
2https://www.teachable.com/200126 msHTTP/1.1cloudflare

See the visual redirect chain in the HTTP Probe tab →

A+
Crawlability
robots.txt present, sitemap with 1043 URLs
PASS
robots.txt present, sitemap with 1043 URLs
Info::
robots.txt is present
Got: 782 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 1043 entries
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 782 B Sitemaps referenced 2 User-agents ChatGPT-User, Google-Extended, ClaudeBot, PerplexityBot, *, GPTBot Blocking No — crawling allowed
User-agent: *
Allow: /

Host: https://www.teachable.com/
Sitemap: https://www.teachable.com/sitemap.xml

# Restricted areas
Disallow: /admin/
Disallow: /account/
Disallow: /login
Disallow: /signup
Disallow: /reset-password
Disallow: /search
Disallow: /404
Disallow: /401
Disallow: /500
Disallow: /*?*

# Priority business pages
Allow: /compare/teachable-vs-thinkific
Allow: /app-hub
Allow: /earn-more
Allow: /digital-downloads
Allow: /examples
Allow: /online-courses
Allow: /pricing
Allow: /teach-online
Allow: /watch-demo


# AI Crawlers 
User-agent: GPTBot
User-agent: ChatGPT-User
User-agent: Google-Extended
User-agent: ClaudeBot
User-agent: PerplexityBot
Allow: /
Allow: /online-courses
Allow: /digital-downloads
Allow: /pricing

Sitemap: https://www.teachable.com/sitemap.xml
sitemap.xml 200 OK
Type URL Set URLs 1043 entries Valid XML Yes
Sample URLs:
A+
Domain Intelligence
teachable.com — via Amazon Registrar, Inc., 23 years, 4 months old, hosted on Cloudflare
PASS
teachable.com — via Amazon Registrar, Inc., 23 years, 4 months old, hosted on Cloudflare
Info::
Domain registered until Apr 14, 2027 (11 months remaining)
Info::
DNSSEC is not enabled
DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.
Info::
Registrar: Amazon Registrar, Inc.
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.
Info::
Hosting: Cloudflare
Got: AS209242
Domain expiry

303 days

April 14, 2027

SSL certificate

69 days

Issued by Let's Encrypt

Domain age

23 years, 4 months

Registered April 14, 2003

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

Cloudflare

ASN AS209242

198.202.211.1

Registrar

Amazon Registrar, Inc.

Unlocked 2 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable DNSSEC to protect visitors from DNS spoofing
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar Amazon Registrar, Inc.
Created April 14, 2003 (23 years, 4 months ago)
Expires April 14, 2027 (11 months)
Last Updated March 10, 2026
Name Servers ian.ns.cloudflare.com, nina.ns.cloudflare.com
DNSSEC Not enabled
Hosting
IP Address 198.202.211.1
ASN AS209242 (CLOUDFLARESPECTRUM Cloudflare, Inc., US)
Provider Cloudflare
Data source: rdap (0.2s)

DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.

Why this matters

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.

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 218 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
30 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
1 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
6 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
218 ms
Total Time Total request time from DNS lookup through full response.
218 ms

Connection waterfall

DNS Lookup 30 ms TCP Connect 1 ms TLS Handshake 6 ms Server Processing 182 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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