cancer.gov
Comprehensive Cancer Information - NCI
Last scanned Jul 21, 2026, 11:37 AM · 1 view
Overall score
Excellent
Top issues to fix
3 issues found · 2 high priority
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
No H1 heading found
SEOAdd exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.
1 broken link on the page
SEOFix or remove broken links — they waste crawl budget and erode user trust.
Summary
Accurate, up-to-date, comprehensive cancer information from the U.S. This website uses Nginx hosted on AKAMAI-ASN1 - Akamai International B.V., NL. SEO is excellent (90/100) and accessibility is excellent (90/100). Security scores excellent (90/100) and performance excellent (100/100). Top issue: No H1 heading found.
SEO
1 issue(s) found
Performance
328 ms
Security
HTTPS & header checks
Accessibility
1 issue(s) found
Organization
Company details published in this site's own structured data.
Contact
Email, phone, and address published on this site's own pages.
- NCIinfo@nih.gov
- Phone
- 1-800-4-CANCER
Meta tags
- Title
- Comprehensive Cancer Information - NCI
- Description
- Accurate, up-to-date, comprehensive cancer information from the U.S. government's principal agency for cancer research.
- Canonical
- https://www.cancer.gov/
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, user-scalable=yes, initial-scale=1, minimum-scale=1
- Robots meta
- index
- Manifest
- https://www.cancer.gov/profiles/custom/cgov_site/themes/custom/cgov/static/images/design-elements/icons/favicons/site.webmanifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- AKAMAI-ASN1 - Akamai International B.V., NL
- CDN provider
- —
- IP address
- 96.17.150.131
- ASN
- AS20940 (AKAMAI-ASN1 - Akamai International B.V., NL)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA |
|
| MX | — |
| TXT | — |
| NS | — |
| CAA | — |
| CNAME |
|
| IPv6 support | Yes |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Let's Encrypt
- Subject
- www.cancer.gov
- Valid from
- Jun 4, 2026
- Valid to
- Sep 2, 2026
- Days until expiry
- 43
- SAN domains
- ccg-cms.cancer.gov, ctsproxy.cancer.gov, dceg-cms.cancer.gov, dceg-prod-acsf.cancer.gov, dceg.cancer.gov, dcegconnect-cms.cancer.gov, dctd-cms.cancer.gov, dctd-prod-acsf.cancer.gov, dctd.cancer.gov, designsystem.cancer.gov, mypart-cms.cancer.gov, nationalcancerplan-cms.cancer.gov, nationalcancerplan-prod-acsf.cancer.gov, nationalcancerplan.cancer.gov, nci-media.cancer.gov, nciconnect-cms.cancer.gov, prescancerpanel-cms.cancer.gov, prescancerpanel-prod-acsf.cancer.gov, prescancerpanel.cancer.gov, sbir-cms.cancer.gov, sbir-prod-acsf.cancer.gov, sbir.cancer.gov, static.cancer.gov, techtransfer-cms.cancer.gov, techtransfer-prod-acsf.cancer.gov, techtransfer.cancer.gov, www-cms.cancer.gov, www-prod-acsf.cancer.gov, www.cancer.gov
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyMissing
- X-Frame-OptionsEnabled
- X-Content-Type-OptionsEnabled
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 0 · H2 8 · H3 0
Links
33 internal · 13 external · 1 broken
Images
14 total · 0 missing alt
Scripts / Styles
5 scripts · 4 stylesheets
JS / CSS size
277 KB · 146 B
Page size
43.7 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 0
- sitemap.xml
- Found
- URLs in sitemap
- -1
SEO issues
- No H1 heading found
Accessibility issues
- No H1 heading found
Scan details
- Requested URL
- https://cancer.gov
- Final URL
- https://www.cancer.gov/
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 328 ms
- HTML size
- 43.7 KB
- Redirect chain
- https://cancer.gov → https://www.cancer.gov/
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Frequently asked questions
- What technology does cancer.gov use?
- cancer.gov is built with Nginx.
- Is cancer.gov secure (HTTPS)?
- Yes. cancer.gov uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 2, 2026.
- Who hosts cancer.gov?
- cancer.gov is hosted on AKAMAI-ASN1 - Akamai International B.V., NL.
- What is cancer.gov's SEO score?
- cancer.gov scored 90/100 for SEO in the latest analysis (excellent).
- What is cancer.gov's overall website score?
- cancer.gov has an overall SiteGraph score of 93/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card