Infrastructure - https://docker.com BeaverCheck Audit

B

URL Variants

www/non-www, trailing slash, HTTP→HTTPS

REVIEW

www/non-www, trailing slash, HTTP→HTTPS

Both www and non-www versions serve content

Got: Both variants return 200 Expected: One variant 301-redirects to the other

HTTP correctly 301-redirects to HTTPS

www / non-www

200https://www.docker.com/

200https://docker.com/

Inconsistent — duplicate content risk

HTTP → HTTPS

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

Consistent

B

TLS Certificate Expiry & Recommendations

74 days until leaf cert expires — 3 issues to address

REVIEW

Certificate validity

74

days left

0d 30d 60d 90d+

Recommended actions

Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
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

1 A records, 100 ms lookup

PASS

1 A records, 100 ms lookup

Resolves to 1 IPv4 address(es)

Got: 23.185.0.4

Single A record — no DNS redundancy

Multiple A records provide failover if one server goes down.

Has 2 IPv6 (AAAA) record(s)

Got: 2620:12a:8000::4, 2620:12a:8001::4

4 nameserver(s) configured

Got: ns-1289.awsdns-33.org, ns-568.awsdns-07.net, ns-1981.awsdns-55.co.uk, ns-207.awsdns-25.com

5 mail exchanger(s) configured

CAA records not checked

CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.

SPF record present in TXT

DNS resolution time: 100 ms

Got: 100 ms

A	23.185.0.4
AAAA	2620:12a:8000::4, 2620:12a:8001::4
CNAME	—
NS	ns-1289.awsdns-33.org, ns-568.awsdns-07.net, ns-1981.awsdns-55.co.uk, ns-207.awsdns-25.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 alt3.aspmx.l.google.com
TXT	google-site-verification=CFmV0geNs1hCxK0mBEpjWaDoNwBIiDxIRjTvt3YGRDM openai-domain-verification=dv-tj9VEsgExQvdNl9SCOa2Awju onetrust-domain-verification=fb12882ae6344670a7b91077bd57c0f1 sinch-domain-verification=d8a66194-44cf-49c3-96ab-74325ad6e7be docker-verification=4b72827b-32c1-4fe6-a843-2256c0df8a31 sonatype-domain-verification=OSSRH-62474 google-site-verification=GjEZ_3KyjpDbmRzGdMUtqMeuXdh7HCSc8uRsPGYL-I0 d0vcwvtyam airtable-verification=7f122efe7db6b16848108e469042c39c detectify-verification=87a64c3bf3301354588d90672bd1b74e anthropic-domain-verification-p1ks1q=BmUzJzzDzqNXVWLXmZVoEvTr3 google-site-verification=Nyiwo5q4kkaD5V-sEiXsW74HXyVRtKVyxYFfZuFLG7M stripe-verification=804359af3a919b4a46343227e384abdf33e10ad5bb81ea9f1d17ed4e7448... cursor-domain-verification-pkwbtp=KD6kIrkeudCadzeviiVJgEWnd opine-verification=14d8ea53-d8ae-406f-93b0-76dc879d9b46 apple-domain-verification=S580UenDqcwy2I1X jamf-site-verification=jqNgc5MzMp4UnSANweyyEQ SPF v=spf1 include:_spf.google.com include:spf.tipalti.com include:_spf.salesforce.c... docusign=aeb25cd4-f743-4efc-b6fb-b8bc5dd1d0e8 zapier-domain-verification-challenge=c3e7ddaf-20bf-40ca-9374-1a917b16be06 miro-verification=116f0987438eb5a48c070e080a68e7d7b3087e5f google-site-verification=i6hYWAXRYCtHNnyiQAYXiy_4StkAMJQiNCfH-3olY-I MS=ms98031138 adobe-idp-site-verification=a8d1a71d0cba44c2521bcb451d9dc708ee20d93c7b5b04791f69... MS=ms42223923 atlassian-domain-verification=I1f5bgOm9sPUEcK/2JTD6weNlWt+Wwsyo5dwvJe1fGjf9V+x3k... astro-domain-verification=cljrj1fgz00hm01lvtaq65gnn google-site-verification=4PyKLfy_lowkc_qcu-byUkmF1kxAUT7tfho7ZiP353s google-site-verification=5e33xBJIwW1XU49IqmIYtN7yi2Iq0GNnWwN4ujn4G_M google-site-verification=VbuWA5NflxQMko2x9BJFIPVYrbuxHQll4UP4gZ4Fm08 google-site-verification=rCKOZlVmB_xuu9DiT-urSmmXAEUGn5RI8PxdyCW5LJg
CAA	Lookup not available with standard resolver

Resolved in 100 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), 53 ms total

PASS

1 redirect(s), 53 ms total

Single redirect

Got: https://docker.com → https://www.docker.com/ (301)

WWW normalization redirect

https://docker.com

5 ms · HTTP/1.1

301

https://www.docker.com/

48 ms · HTTP/1.1 FINAL

#	URL	Status	Time	Protocol	Server
1	https://docker.com	301	5 ms	HTTP/1.1	Pantheon
2	https://www.docker.com/	200	48 ms	HTTP/1.1	nginx

See the visual redirect chain in the HTTP Probe tab →

A+

IPv6 Readiness

IPv6 reachable (1 ms)

PASS

IPv6 reachable (1 ms)

IPv6 is configured and reachable at 2620:12a:8000::4, 2620:12a:8001::4

Got: 1 ms connect

IPv6 Ready

AAAA Records 2620:12a:8000::4, 2620:12a:8001::4 Connection Reachable (1 ms)

A+

Crawlability

robots.txt present, sitemap with 15 URLs

PASS

robots.txt present, sitemap with 15 URLs

robots.txt is present

Got: 1033 bytes

sitemap.xml is present

sitemap.xml is valid XML

sitemap.xml contains 15 entries

Sitemap index with 15 child sitemaps

robots.txt references sitemap

robots.txt 200 OK

Size 1033 B Sitemaps referenced 2 User-agents * Blocking No — crawling allowed

User-agent: *
Allow: /wp-admin/admin-ajax.php
Disallow: /wp-admin/
Disallow: /pricing/contact-sales/bss-cc-thankyou/
Disallow: /pricing/contact-sales/bss-thankyou/
Disallow: /company/contact-thank-you/
Disallow: /thank-you-subscribing-docker-weekly/
Disallow: /pricing/contact-sales2/
Disallow: /cdn-cgi/
Disallow: /static/
Disallow: /c/
Disallow: /p/
Disallow: /products/telepresence-for-docker/thank-you/
Disallow: /style-guide/
Disallow: /search/

Allow: /ja-jp/wp-admin/admin-ajax.php
Disallow: /ja-jp/wp-admin/
Disallow: /ja-jp/pricing/contact-sales/bss-cc-thankyou/
Disallow: /ja-jp/pricing/contact-sales/bss-thankyou/
Disallow: /ja-jp/company/contact-thank-you/
Disallow: /ja-jp/thank-you-subscribing-docker-weekly/
Disallow: /ja-jp/pricing/contact-sales2/
Disallow: /ja-jp/cdn-cgi/
Disallow: /ja-jp/static/
Disallow: /ja-jp/c/
Disallow: /ja-jp/products/telepresence-for-docker/thank-you/
Disallow: /ja-jp/style-guide/


Sitemap: https://www.docker.com/sitemap_index.xml
Sitemap: https://www.docker.com/ja-jp/sitemap_index.xml

sitemap.xml 200 OK

Type Sitemap Index URLs 15 entries Valid XML Yes

Child Sitemaps:

A+

Domain Intelligence

docker.com — via Gandi SAS, 31 years, 8 months old

PASS

docker.com — via Gandi SAS, 31 years, 8 months old

Domain registered until Jan 26, 2027 (9 months remaining)

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.

Registrar: Gandi SAS

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

224 days

January 26, 2027

SSL certificate

74 days

Issued by Let's Encrypt

Domain age

31 years, 8 months

Registered January 25, 1995

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

Unknown

2620:12a:8001::4

Registrar

Gandi SAS

Unlocked 4 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 Gandi SAS

Created January 25, 1995 (31 years, 8 months ago)

Expires January 26, 2027 (9 months)

Last Updated January 13, 2026

Name Servers ns-1289.awsdns-33.org, ns-1981.awsdns-55.co.uk, ns-207.awsdns-25.com, ns-568.awsdns-07.net

DNSSEC Not enabled

Hosting

IP Address 2620:12a:8001::4

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 45 ms — DNS, TCP, TLS, TTFB, content transfer breakdown

PASS

DNS Lookup

37 ms

TCP Connect

0 ms

TLS Handshake

3 ms

Time to First Byte

45 ms

Total Time

45 ms

Connection waterfall

DNS Lookup 37 ms TCP Connect 0 ms TLS Handshake 3 ms Server Processing 4 ms Content Transfer 0 ms

A+

CDN & Delivery

Fastly (HIT)

PASS

Fastly (HIT)

Site is served via Fastly CDN

Got: x-served-by: cache-toj-leto2350053-TOJ

CDN cache status: HIT

CDN Detected: Fastly

Provider Fastly Cache Status HIT Evidence x-served-by: cache-toj-leto2350053-TOJ