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Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
93
GRADE
A
FIX
0
REVIEW
3
PASS
6
INFO
0
Probed from Madrid, Spain
301 Moved Permanently
Checks
9
6 PASS 3 REVIEW
B
Crawlability
robots.txt present, no sitemap
REVIEW
robots.txt present, no sitemap
Info::
robots.txt is present
Got: 1738 bytes
Info::
No sitemap.xml found
A sitemap helps search engines discover and index your pages more efficiently.
Info::
robots.txt does not reference a sitemap
Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

A sitemap helps search engines discover and index your pages more efficiently.

Why this matters

No sitemap.xml — Google relies on crawl-graph discovery alone, slowing indexing of deep or fresh URLs.

Learn more

A sitemap accelerates Google's discovery of new and updated content. Most CMSes auto-generate one; static-site frameworks need a build-step plugin. Reference it from robots.txt and submit in Search Console to confirm Google can fetch it.

Source: sitemaps.org / Google Search Central

Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

Why this matters

robots.txt omits Sitemap: directive — crawlers must fetch /sitemap.xml by convention; reliable but missing the explicit hint.

Source: sitemaps.org

robots.txt 200 OK
Size 1738 B Sitemaps referenced 0 User-agents *, Amazonbot, GPTBot, meta-externalagent, Applebot-Extended, Bytespider, CCBot, ClaudeBot, CloudflareBrowserRenderingCrawler, Google-Extended Blocking No — crawling allowed
# As a condition of accessing this website, you agree to abide by the following
# content signals:

# (a)  If a Content-Signal = yes, you may collect content for the corresponding
#      use.
# (b)  If a Content-Signal = no, you may not collect content for the
#      corresponding use.
# (c)  If the website operator does not include a Content-Signal for a
#      corresponding use, the website operator neither grants nor restricts
#      permission via Content-Signal with respect to the corresponding use.

# The content signals and their meanings are:

# search:   building a search index and providing search results (e.g., returning
#           hyperlinks and short excerpts from your website's contents). Search does not
#           include providing AI-generated search summaries.
# ai-input: inputting content into one or more AI models (e.g., retrieval
#           augmented generation, grounding, or other real-time taking of content for
#           generative AI search answers).
# ai-train: training or fine-tuning AI models.

# ANY RESTRICTIONS EXPRESSED VIA CONTENT SIGNALS ARE EXPRESS RESERVATIONS OF
# RIGHTS UNDER ARTICLE 4 OF THE EUROPEAN UNION DIRECTIVE 2019/790 ON COPYRIGHT
# AND RELATED RIGHTS IN THE DIGITAL SINGLE MARKET.

# BEGIN Cloudflare Managed content

User-agent: *
Content-Signal: search=yes,ai-train=no
Allow: /

User-agent: Amazonbot
Disallow: /

User-agent: Applebot-Extended
Disallow: /

User-agent: Bytespider
Disallow: /

User-agent: CCBot
Disallow: /

User-agent: ClaudeBot
Disallow: /

User-agent: CloudflareBrowserRenderingCrawler
Disallow: /

User-agent: Google-Extended
Disallow: /

User-agent: GPTBot
Disallow: /

User-agent: meta-externalagent
Disallow: /

# END Cloudflare Managed Content


sitemap.xml No sitemap found

No sitemap found

Adding a sitemap helps search engines discover your pages.

B
TLS Certificate Expiry & Recommendations
69 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

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

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
B
CDN & Delivery
Cloudflare
REVIEW
Cloudflare
Info::
Site is served via Cloudflare CDN (edge: CDG)
Got: cf-ray: 9e8bc6f87e951bec-CDG
CDN Detected: Cloudflare
Provider Cloudflare Evidence cf-ray: 9e8bc6f87e951bec-CDG
A
DNS Records
2 A records, 32 ms lookup
PASS
2 A records, 32 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 104.16.147.32, 104.16.163.32
Info::
Has 2 IPv6 (AAAA) record(s)
Got: 2606:4700::6810:a320, 2606:4700::6810:9320
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::
No SPF record found in TXT records
SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.
Info::
DNS resolution time: 32 ms
Got: 32 ms
A104.16.147.32, 104.16.163.32
AAAA2606:4700::6810:a320, 2606:4700::6810:9320
CNAME
NS
MX
TXT
CAALookup not available with standard resolver
Resolved in 32 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.

SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.

Why this matters

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 Chain
1 redirect(s), 154 ms total
PASS
1 redirect(s), 154 ms total
Info::
Single redirect
Got: https://www.codepen.io → https://codepen.io/ (301)
Info::
WWW normalization redirect

https://www.codepen.io

61 ms · HTTP/1.1

301

https://codepen.io/

93 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://www.codepen.io30161 msHTTP/1.1cloudflare
2https://codepen.io/40393 msHTTP/1.1cloudflare

See the visual redirect chain in the HTTP Probe tab →

A+
IPv6 Readiness
IPv6 reachable (17 ms)
PASS
IPv6 reachable (17 ms)
Info::
IPv6 is configured and reachable at 2606:4700::6810:a320, 2606:4700::6810:9320
Got: 17 ms connect
IPv6 Ready
AAAA Records 2606:4700::6810:a320, 2606:4700::6810:9320 Connection Reachable (17 ms)
A+
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
PASS
www/non-www, trailing slash, HTTP→HTTPS
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

200https://www.codepen.io/
403https://codepen.io/

HTTP → HTTPS

301http://www.codepen.io/ https://codepen.io/

Consistent

A+
Domain Intelligence
codepen.io — via Gandi SAS, 14 years, 3 months old
PASS
codepen.io — via Gandi SAS, 14 years, 3 months old
Info::
Domain registered until Feb 26, 2028 (1 years, 10 months remaining)
Info::
Registrar: Gandi SAS
Domain expiry

593 days

February 26, 2028

SSL certificate

69 days

Issued by Google Trust Services

Domain age

14 years, 3 months

Registered February 26, 2012

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

Unknown

2606:4700::6810:9320

Registrar

Gandi SAS

Lock status unknown 2 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Registrar Gandi SAS
Created February 26, 2012 (14 years, 3 months ago)
Expires February 26, 2028 (1 years, 10 months)
Last Updated November 17, 2025
Name Servers kristin.ns.cloudflare.com, albert.ns.cloudflare.com
Registrant CodePen
Hosting
IP Address 2606:4700::6810:9320
Data source: whois (1.1s)
A+
HTTP Probe Timing
Total 88 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
31 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.
21 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
88 ms
Total Time Total request time from DNS lookup through full response.
88 ms

Connection waterfall

DNS Lookup 31 ms TCP Connect 17 ms TLS Handshake 21 ms Server Processing 19 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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