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https://www.calendly.com

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
92
GRADE
A
FIX
0
REVIEW
3
PASS
6
INFO
0
Probed from Madrid, Spain
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.calendly.com/
200https://calendly.com/

Inconsistent — duplicate content risk

HTTP → HTTPS

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

Consistent

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

Certificate validity

62
days left
0d 30d 60d 90d+

Recommended actions

  • Submit your domain to hstspreload.org to be added to the Chrome preload list
  • 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: 9e8bd9860847d87e-CDG
CDN Detected: Cloudflare
Provider Cloudflare Evidence cf-ray: 9e8bd9860847d87e-CDG
A
DNS Records
2 A records, 39 ms lookup
PASS
2 A records, 39 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 172.64.146.81, 104.18.41.175
Info::
Has 2 IPv6 (AAAA) record(s)
Got: 2606:4700:4402::6812:29af, 2a06:98c1:3107::ac40:9251
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: 39 ms
Got: 39 ms
A172.64.146.81, 104.18.41.175
AAAA2606:4700:4402::6812:29af, 2a06:98c1:3107::ac40:9251
CNAME—
NS—
MX—
TXT—
CAALookup not available with standard resolver
Resolved in 39 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), 294 ms total
PASS
1 redirect(s), 294 ms total
Info::
Single redirect
Got: https://www.calendly.com → https://calendly.com/ (301)
Info::
WWW normalization redirect

https://www.calendly.com

63 ms · HTTP/1.1

301

https://calendly.com/

231 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://www.calendly.com30163 msHTTP/1.1cloudflare
2https://calendly.com/200231 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 2606:4700:4402::6812:29af, 2a06:98c1:3107::ac40:9251
Got: 17 ms connect
IPv6 Ready
AAAA Records 2606:4700:4402::6812:29af, 2a06:98c1:3107::ac40:9251 Connection Reachable (17 ms)
A+
Crawlability
robots.txt present, sitemap with 986 URLs
PASS
robots.txt present, sitemap with 986 URLs
Info::
robots.txt is present
Got: 336 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 986 entries
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 336 B Sitemaps referenced 1 User-agents *, ia_archiver, CCBot Blocking No — crawling allowed
User-Agent: *
Allow: /llms.txt
Allow: /pricing
Disallow: /abuse_reports/new
Disallow: /*?*
Disallow: /app/

User-Agent: ia_archiver
Allow: /$
Allow: /llms.txt
Allow: /pricing
Disallow: /

User-Agent: CCBot
Allow: /llms.txt
Allow: /pricing
Disallow: /

Host: https://calendly.com
Sitemap: https://calendly.com/marketing-site/sitemap.xml
sitemap.xml 200 OK
Type URL Set URLs 986 entries Valid XML Yes
Sample URLs:
A+
Domain Intelligence
calendly.com — via GoDaddy.com, LLC, 13 years, 3 months old
PASS
calendly.com — via GoDaddy.com, LLC, 13 years, 3 months old
Info::
Domain registered until Feb 26, 2027 (10 months remaining)
Info::
DNSSEC is enabled
Info::
Registrar: GoDaddy.com, LLC
Domain expiry

256 days

February 26, 2027

SSL certificate

62 days

Issued by Let's Encrypt

Domain age

13 years, 3 months

Registered February 26, 2013

DNSSEC

Enabled

Protects against DNS spoofing

Hosting

Unknown

2606:4700:4402::6812:29af

Registrar

GoDaddy.com, LLC

Lock status unknown 2 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Registrar GoDaddy.com, LLC
Created February 26, 2013 (13 years, 3 months ago)
Expires February 26, 2027 (10 months)
Last Updated September 13, 2022
Name Servers hope.ns.cloudflare.com, roan.ns.cloudflare.com
DNSSEC Enabled
Hosting
IP Address 2606:4700:4402::6812:29af
Data source: rdap (0.1s)
A+
HTTP Probe Timing
Total 91 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.
21 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
91 ms
Total Time Total request time from DNS lookup through full response.
91 ms

Connection waterfall

DNS Lookup 32 ms TCP Connect 17 ms TLS Handshake 21 ms Server Processing 22 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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