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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
2
PASS
7
INFO
0
Probed from Santa Clara, United Stated
200 OK
Checks
9
7 PASS 2 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
TLS Certificate Expiry & Recommendations
303 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

303
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
A+
DNS Records
4 A records, 80 ms lookup
PASS
4 A records, 80 ms lookup
Info::
Resolves to 4 IPv4 address(es)
Got: 18.155.202.105, 18.155.202.104, 18.155.202.110, 18.155.202.99
Info::
No IPv6 (AAAA) records
Info::
4 nameserver(s) configured
Got: ns-1065.awsdns-05.org, ns-1572.awsdns-04.co.uk, ns-225.awsdns-28.com, ns-837.awsdns-40.net
Info::
2 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: 80 ms
Got: 80 ms
A18.155.202.105, 18.155.202.104, 18.155.202.110, 18.155.202.99
AAAA—
CNAME—
NSns-1065.awsdns-05.org, ns-1572.awsdns-04.co.uk, ns-225.awsdns-28.com, ns-837.awsdns-40.net
MX
10 mxa-00672001.gslb.pphosted.com
10 mxb-00672001.gslb.pphosted.com
TXT
DC5E374380
OSSRH-51450
ZOOM_verify_XxtkbTmXREqW-gC9oUt_JQ
adobe-idp-site-verification=e62bdaaa6e859ff8bd5bf72625dbbd549c23f0de1fdb766235ef...
anthropic-domain-verification-v8cdhs=P5CPYQkBtkjBPMgAZIvtut9zd
apple-domain-verification=BkV5OZenVheGWVKC
astro-domain-verification=cml9sndz92qqm01jm14o8nqho
atlassian-domain-verification=9tj+F5NsRlmMKY+gbNLn4kP5OmRWYtiQbLcnIFwe3m4l+99gvw...
box-domain-verification=5f46d2be1dbceca19facc856c1c495d1e542fc177dfd64eb9cce08de...
ccisso=e9697c9a-798a-48ee-999e-44a7f9eab0a2
clojars circleci_publish
cursor-domain-verification-a9dwf3=OxECwMG1mvh1CATOVrwb3pTIH
docker-verification=a5aae3d9-5a74-4a9b-84ca-a0caf85dc170
docusign=589fcafb-1c84-47fe-8f13-d44a3e2dd30f
docusign=c1c3ad48-e560-44b7-aac2-8346a8d1391a
drift-domain-verification=94d102dfe9b1862190786ad91ec34c9fdf3ba2c3df200f764737ef...
dropbox-domain-verification=61pion11z5cz
google-site-verification=Au0NOifkJ4cu5d6kqPdT_9OIcwFB5h6fz2ukOZoP7vk
hubspot-domain-verification=ZGQ2MmUyODQtYThiZS00MzY2LThkNzgtOGExZGQ0NThmNzk1
mgverify=bb6f143dedb85052f4ef1fc2f56d900e0a2a31c84d455f1733f674c1cb55069c
segment-site-verification=ZapQvl57wrmVzIVRTz5MXx3954FpmM4I
SPF v=spf1 include:spf.circleci.com ~all
vitally-domain-verification=ee393126-6828-4207-b56c-e4912cb10dde
CAALookup not available with standard resolver
Resolved in 80 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://circleci.com

https://circleci.com

129 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://circleci.com200129 msHTTP/1.1
A+
Crawlability
robots.txt present, sitemap with 210 URLs
PASS
robots.txt present, sitemap with 210 URLs
Info::
robots.txt is present
Got: 940 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 210 entries
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 940 B Sitemaps referenced 12 User-agents Claude-User, Perplexity-User, *, ChatGPT-User Blocking No — crawling allowed
User-agent: *
Disallow: /?join=
Disallow: /login
Disallow: /github-login
Disallow: /dashboard
Disallow: /bitbucket-login/
Disallow: /bitbucket-login
Disallow: /api/

User-agent: ChatGPT-User
User-agent: Claude-User
User-agent: Perplexity-User
Disallow: /?join=
Disallow: /login
Disallow: /github-login
Disallow: /dashboard
Disallow: /bitbucket-login/
Disallow: /bitbucket-login

Sitemap: https://circleci.com/sitemap.xml
Sitemap: https://circleci.com/de/sitemap.xml
Sitemap: https://circleci.com/es/sitemap.xml
Sitemap: https://circleci.com/ja/sitemap.xml
Sitemap: https://circleci.com/ko/sitemap.xml
Sitemap: https://circleci.com/ru/sitemap.xml
Sitemap: https://circleci.com/zh/sitemap.xml
Sitemap: https://circleci.com/blog/sitemap.xml
Sitemap: https://circleci.com/ja/blog/sitemap.xml
Sitemap: https://circleci.com/changelog/sitemap.xml
Sitemap: https://circleci.com/docs/sitemap.xml
Sitemap: https://circleci.com/developer/sitemap.xml
sitemap.xml 200 OK
Type URL Set URLs 210 entries Valid XML Yes
Sample URLs:
A+
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
PASS
www/non-www, trailing slash, HTTP→HTTPS
Info::
www/non-www redirect configured correctly (preferred: non-www)
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

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

Preferred variant: non-www

HTTP → HTTPS

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

Consistent

A+
Domain Intelligence
circleci.com — via Amazon Registrar, Inc., 14 years, 9 months old, hosted on AWS
PASS
circleci.com — via Amazon Registrar, Inc., 14 years, 9 months old, hosted on AWS
Info::
Domain registered until Sep 1, 2026 (4 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.
Info::
Hosting: AWS
Got: AS16509
Domain expiry

50 days

September 1, 2026

SSL certificate

303 days

Issued by Amazon

Domain age

14 years, 9 months

Registered September 1, 2011

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

AWS

ASN AS16509

18.155.202.105

Registrar

Amazon Registrar, Inc.

Lock status unknown 4 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Renew the domain or enable auto-renewal to prevent accidental expiry
  • Enable DNSSEC to protect visitors from DNS spoofing
Registrar Amazon Registrar, Inc.
Created September 1, 2011 (14 years, 9 months ago)
Expires September 1, 2026 (4 months)
Last Updated November 11, 2025
Name Servers ns-1065.awsdns-05.org, ns-1572.awsdns-04.co.uk, ns-225.awsdns-28.com, ns-837.awsdns-40.net
DNSSEC Not enabled
Hosting
IP Address 18.155.202.105
ASN AS16509 (AMAZON-02 - Amazon.com, Inc., US)
Provider AWS
Data source: rdap (0.1s)

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

A+
HTTP Probe Timing
Total 131 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
5 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
3 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
5 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
114 ms
Total Time Total request time from DNS lookup through full response.
131 ms

Connection waterfall

DNS Lookup 5 ms TCP Connect 3 ms TLS Handshake 5 ms Server Processing 101 ms Content Transfer 17 ms
A
CDN & Delivery
AWS CloudFront (Miss from cloudfront)
PASS
AWS CloudFront (Miss from cloudfront)
Info::
Site is served via AWS CloudFront CDN (edge: SFO53-P2)
Got: x-amz-cf-id: HtUXzd-W9h3LC0uuOHSikEQN9ozTcTWIO2gR02xEXLUi3B64tidUuw==
Info::
CDN cache status: Miss from cloudfront
CDN Detected: AWS CloudFront
Provider AWS CloudFront Cache Status Miss from cloudfront Evidence x-amz-cf-id: HtUXzd-W9h3LC0uuOHSikEQN9ozTcTWIO2gR02xEXLUi3B64tidUuw==
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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