adventofcode.com
Advent of Code 2025
Last scanned Jul 26, 2026, 12:49 PM
Overall score
Fair
Summary
This website uses Apache hosted on AWS. SEO is fair (55/100) and accessibility is excellent (95/100). Security scores good (75/100) and performance excellent (100/100). Top issue: Missing meta description.
- United States
- Hosted on AWS
Top issues to fix
11 issues found · 3 high priority
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing meta description
SEOAdd a ~150-character meta description to control your search-result snippet and lift click-through rate.
Missing viewport meta tag
AccessibilityAdd <meta name="viewport" content="width=device-width, initial-scale=1"> — without it the site is broken on mobile.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Missing canonical link
SEOAdd <link rel="canonical"> so search engines know which URL variant to index.
+5 more issues — details in the sections below.
SEO
7 issue(s) found
Performance
253 ms
Security
HTTPS & header checks
Accessibility
1 issue(s) found
Contact
Email, phone, and address published on this site's own pages.
Meta tags
- Title
- Advent of Code 2025
- Description
- Canonical
- Language
- en-us
- Charset
- utf-8
- Viewport
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- AWS
- CDN provider
- —
- IP address
- 44.209.166.164
- ASN
- AS16509 (AMAZON-02 - Amazon.com, Inc., US)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA | — |
| MX |
|
| TXT |
|
| NS |
|
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Amazon
- Subject
- adventofcode.com
- Valid from
- Jul 17, 2026
- Valid to
- Jan 30, 2027
- Days until expiry
- 186
- SAN domains
- adventofcode.com, www.adventofcode.com
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 2 · H2 0 · H3 0
Links
23 internal · 0 external · 0 broken
Images
0 total · 0 missing alt
Scripts / Styles
2 scripts · 2 stylesheets
JS / CSS size
621 B · 10.3 KB
Page size
7.1 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Missing meta description
- Missing canonical link
- Multiple H1 headings found
- No structured data (JSON-LD) found
- Missing OpenGraph tags
- robots.txt not found
- sitemap.xml not found
Accessibility issues
- Missing viewport meta tag
Scan details
- Requested URL
- https://adventofcode.com
- Final URL
- https://adventofcode.com
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 253 ms
- HTML size
- 7.1 KB
- Redirect chain
- https://adventofcode.com
See something wrong on this report? Request a correction
Related websites
Same technology stack
lucerna-chem.ch
Lucerna-Chem AG
myhealthbox.eu
myHealthbox - The medicines and healthcare products database
gopay.com
Payment gateway that helps you earn more | GoPay
piensasolutions.com
Piensa Solutions | Comprar dominios y hosting baratos
3u.net
3U HOLDING AG: Erfolg in Digitalisierung, Onlinehandel & Erneuerbaren Energien
dit.ie
Technological University Dublin | TU Dublin
Same hosting provider
surveyplanet.com
Free Online Survey Maker | Unlimited Surveys | Surveyplanet
relive.cc
Relive | Run, Ride, Hike & more
neuralink.com
Neuralink — Pioneering Brain Computer Interfaces
gabor.com
Gabor Shoes GmbH | Offizieller Online-Shop für Gabor Schuhe
scrabble-solver.com
Scrabble Solver - Scrabble Word Finder and Anagram Solver
gopay.com
Payment gateway that helps you earn more | GoPay
Frequently asked questions
- What technology does adventofcode.com use?
- adventofcode.com is built with Google Analytics, Apache.
- Is adventofcode.com secure (HTTPS)?
- Yes. adventofcode.com uses TLS 1.3 with a certificate issued by Amazon, valid until Jan 30, 2027.
- Who hosts adventofcode.com?
- adventofcode.com is hosted on AWS.
- What is adventofcode.com's SEO score?
- adventofcode.com scored 55/100 for SEO in the latest analysis (fair).
- What is adventofcode.com's overall website score?
- adventofcode.com has an overall SiteGraph score of 79/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card