Infrastructure - https://www.ubuntu.com BeaverCheck Audit

D

CDN & Delivery

Action

No CDN detected

FIX

No CDN detected

A CDN can significantly improve load times for users around the world by caching content at edge nodes closer to them.

No CDN detected

Consider using a CDN to improve global delivery speed and reduce origin load.

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.ubuntu.com/

200https://ubuntu.com/

Inconsistent — duplicate content risk

HTTP → HTTPS

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

Consistent

C

TLS Certificate Expiry & Recommendations

Action

22 days until leaf cert expires — 6 issues to address

REVIEW

Certificate validity

22

days left

0d 30d 60d 90d+

Renew soon — under 30 days remaining

Recommended actions

Renew certificate — 22 days remaining
Extend HSTS max-age to at least 31536000 (1 year) to meet the preload list criteria
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

A

DNS Records

3 A records, 32 ms lookup

PASS

3 A records, 32 ms lookup

Resolves to 3 IPv4 address(es)

Got: 185.125.190.20, 185.125.190.21, 185.125.190.29

Has 3 IPv6 (AAAA) record(s)

Got: 2620:2d:4000:1::27, 2620:2d:4000:1::28, 2620:2d:4000:1::26

No NS records found

No MX records — email not configured via DNS

CAA records not checked

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

No SPF record found in TXT records

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

DNS resolution time: 32 ms

Got: 32 ms

A	185.125.190.20, 185.125.190.21, 185.125.190.29
AAAA	2620:2d:4000:1::27, 2620:2d:4000:1::28, 2620:2d:4000:1::26
CNAME	—
NS	—
MX	—
TXT	—
CAA	Lookup 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), 207 ms total

PASS

1 redirect(s), 207 ms total

Single redirect

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

WWW normalization redirect

https://www.ubuntu.com

93 ms · HTTP/1.1

301

https://ubuntu.com/

114 ms · HTTP/1.1 FINAL

#	URL	Status	Time	Protocol	Server
1	https://www.ubuntu.com	301	93 ms	HTTP/1.1	nginx/1.14.0 (Ubuntu)
2	https://ubuntu.com/	200	114 ms	HTTP/1.1	nginx/1.14.0 (Ubuntu)

See the visual redirect chain in the HTTP Probe tab →

A+

IPv6 Readiness

IPv6 reachable (23 ms)

PASS

IPv6 reachable (23 ms)

IPv6 is configured and reachable at 2620:2d:4000:1::27, 2620:2d:4000:1::28, 2620:2d:4000:1::26

Got: 23 ms connect

IPv6 Ready

AAAA Records 2620:2d:4000:1::27, 2620:2d:4000:1::28, 2620:2d:4000:1::26 Connection Reachable (23 ms)

A+

Crawlability

robots.txt present, sitemap with 15 URLs

PASS

robots.txt present, sitemap with 15 URLs

robots.txt is present

Got: 5262 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 5262 B Sitemaps referenced 11 User-agents *, ChatGPT-User, GPTBot, PerplexityBot, ClaudeBot, Claude-Web Blocking No — crawling allowed

# ===========================================
# ubuntu.com robots.txt
# Strategy: 
#   - Block private/transactional/search paths for all.
#   - Group major AI Retrieval & Crawling bots to optimize crawl budget.
#   - Allow high-value product/doc paths; block noise.
# ===========================================

# ===========================================
# DEFAULT RULES — all crawlers
# ===========================================
User-Agent: *
Disallow: /search
Disallow: /search*
Disallow: /*/search*
Disallow: /account
Disallow: /account/*
Disallow: /login
Disallow: /logout
Disallow: /pro/dashboard
Disallow: /pro/users
Disallow: /pro/account-users
Disallow: /pro/subscribe
Disallow: /pro/activate
Disallow: /pro/attach
Disallow: /pro/offer
Disallow: /pro/offers
Disallow: /pro/renewals/
Disallow: /pro/contracts/
Disallow: /pro/trial/
Disallow: /pro/set-auto-renewal
Disallow: /pro/user-subscriptions
Disallow: /pro/distributor/users
Disallow: /pro/distributor/invoice
Disallow: /pro/distributor/thank-you
Disallow: /account.json
Disallow: /mirrors.json
Disallow: /pro/subscriptions.json
Disallow: /pro/offers.json
Disallow: /pro/channel-offers.json
Disallow: /thank-you
Disallow: /*/thank-you
Disallow: /blog/draft-blogs
Disallow: /blog/draft-blogs/*
Disallow: /tests/
Disallow: /tests/*
Disallow: /sentry-debug
Disallow: /mobile
Disallow: /mobile/*
Disallow: /phone
Disallow: /phone/*
Disallow: /tablet
Disallow: /tablet/*
Disallow: /tv
Disallow: /tv/*
Disallow: /devices
Disallow: /devices/*
Disallow: /credentials/exam*
Crawl-delay: 1

# ===========================================
# AI OPTIMIZED RULES
# Includes: OpenAI (Browsing & Crawling), Perplexity, and Anthropic
# ===========================================
User-Agent: ChatGPT-User
User-Agent: GPTBot
User-Agent: PerplexityBot
User-Agent: ClaudeBot
User-Agent: Claude-Web

# Nudge toward Markdown endpoints
Allow: /*?format=md

# High-value Content Priority
Allow: /server
Allow: /desktop
Allow: /cloud
Allow: /openstack
Allow: /kubernetes
Allow: /ceph
Allow: /containers
Allow: /core
Allow: /ai
Allow: /pro
Allow: /landscape
Allow: /security
Allow: /internet-of-things
Allow: /embedded
Allow: /hpc
Allow: /real-time
Allow: /confidential-computing
Allow: /enterprise-store
Allow: /kernel
Allow: /toolchains
Allow: /robotics
Allow: /certified
Allow: /about
Allow: /community
Allow: /download
Allow: /pricing
Allow: /training
Allow: /credentials
Allow: /support
Allow: /managed
Allow: /managed-infrastructure
Allow: /aws
Allow: /azure
Allow: /gcp
Allow: /dell
Allow: /ibm
Allow: /nvidia
Allow: /hpe
Allow: /supermicro
Allow: /blender
Allow: /blog
Allow: /tutorials
Allow: /appliance
Allow: /cpu-compatibility
Allow: /what-is-enterprise-linux

# Block "Noise" (Forms, fragments, and archives that exhaust context windows)
Disallow: /search
Disallow: /search*
Disallow: /*/search*
Disallow: /account
Disallow: /account/*
Disallow: /account.json
Disallow: /mirrors.json
Disallow: /login
Disallow: /logout
Disallow: /contact-us
Disallow: /contact-us/*
Disallow: /*/contact-us
Disallow: /thank-you
Disallow: /*/thank-you
Disallow: /engage
Disallow: /engage/*
Disallow: /takeovers
Disallow: /takeovers.json
Disallow: /templates/
Disallow: /frame
Disallow: /marketo/submit
Disallow: /blog/feed
Disallow: /blog/archives
Disallow: /blog/tag/
Disallow: /blog/author/
Disallow: /blog/topic/
Disallow: /blog/group/
Disallow: /blog/latest-news
Disallow: /blog/events-and-webinars
Disallow: /blog/draft-blogs
Disallow: /blog/draft-blogs/*
Disallow: /engage/resources.json
Disallow: /engage/metadata.json
Disallow: /pro/dashboard
Disallow: /pro/users
Disallow: /pro/account-users
Disallow: /pro/subscribe
Disallow: /pro/activate
Disallow: /pro/attach
Disallow: /pro/offer
Disallow: /pro/offers
Disallow: /pro/renewals/
Disallow: /pro/contracts/
Disallow: /pro/trial/
Disallow: /pro/set-auto-renewal
Disallow: /pro/user-subscriptions
Disallow: /pro/subscriptions.json
Disallow: /pro/offers.json
Disallow: /pro/channel-offers.json
Disallow: /pro/distributor/users
Disallow: /pro/distributor/invoice
Disallow: /pro/distributor/thank-you
Disallow: /subscription-centre
Disallow: /rfp
Disallow: /tests/
Disallow: /tests/*
Disallow: /_image-testing/
Disallow: /sentry-debug
Disallow: /credentials/exam*
Disallow: /mobile
Disallow: /mobile/*
Disallow: /phone
Disallow: /phone/*
Disallow: /tablet
Disallow: /tablet/*
Disallow: /tv
Disallow: /tv/*
Disallow: /devices
Disallow: /devices/*
Disallow: /kubeconeurope2020
Disallow: /masters-conference

# Performance
Crawl-delay: 2

# ===========================================
# SITEMAPS
# ===========================================
Sitemap: https://ubuntu.com/sitemap.xml

# High-Value Content Trees (Prioritized for AI Crawlers)
Sitemap: https://ubuntu.com/sitemap_tree.xml
Sitemap: https://ubuntu.com/blog/sitemap.xml
Sitemap: https://ubuntu.com/tutorials/sitemap.xml
Sitemap: https://ubuntu.com/server/docs/doc-sitemap.xml
Sitemap: https://ubuntu.com/openstack/docs/sitemap.xml
Sitemap: https://ubuntu.com/ceph/docs/sitemap.xml
Sitemap: https://ubuntu.com/security/notices/sitemap.xml
Sitemap: https://ubuntu.com/security/cves/sitemap.xml
Sitemap: https://ubuntu.com/security/vulnerabilities/sitemap.xml
Sitemap: https://ubuntu.com/community/docs/sitemap.xml

sitemap.xml 200 OK

Type Sitemap Index URLs 15 entries Valid XML Yes

Child Sitemaps:

A

Domain Intelligence

ubuntu.com — via MarkMonitor Inc., 22 years, 2 months old

PASS

ubuntu.com — via MarkMonitor Inc., 22 years, 2 months old

Domain expires in 51 days

Consider enabling auto-renewal to prevent accidental expiration.

Got: Expires May 29, 2026

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: MarkMonitor Inc.

Domain expiry

EXPIRED

May 29, 2026

SSL certificate

22 days

Issued by Let's Encrypt

Domain age

22 years, 2 months

Registered May 29, 2004

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

Unknown

2620:2d:4000:1::26

Registrar

MarkMonitor Inc.

Lock status unknown 3 NS records

Expiry timeline

Today

+1 year

Domain expiry SSL expiry Danger zone (≤30 days)

Recommended actions

Domain has EXPIRED — renew immediately to avoid total site outage
Renew the TLS certificate or verify auto-renewal is working
Enable DNSSEC to protect visitors from DNS spoofing

Registrar MarkMonitor Inc.

Created May 29, 2004 (22 years, 2 months ago)

Expires May 29, 2026 (1 months)

Last Updated April 27, 2024

Name Servers ns1.canonical.com, ns2.canonical.com, ns3.canonical.com

DNSSEC Not enabled

Hosting

IP Address 2620:2d:4000:1::26

Data source: rdap (0.1s)

Consider enabling auto-renewal to prevent accidental expiration.

Why this matters

Domain expiry approaching — renew immediately and ensure auto-renew + alerting are configured.

Source: ICANN renewal policy

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

PASS

DNS Lookup

32 ms

TCP Connect

24 ms

TLS Handshake

28 ms

Time to First Byte

110 ms

Total Time

110 ms

Connection waterfall

DNS Lookup 32 ms TCP Connect 24 ms TLS Handshake 28 ms Server Processing 25 ms Content Transfer 0 ms