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cancer.gov

Comprehensive Cancer Information - NCI

Last scanned Jul 29, 2026, 2:00 PM · 8 views

90

Overall score

Excellent

Summary

Accurate, up-to-date, comprehensive cancer information from the U.S. This website uses Nginx. SEO is good (80/100) and accessibility is excellent (90/100). Security scores excellent (90/100) and performance excellent (100/100). Top issue: No H1 heading found.

Accurate, up-to-date, comprehensive cancer information from the U.S. government's principal agency for cancer research.

Top issues to fix

5 issues found · 2 high priority

  • Missing Content-Security-Policy header

    Security

    Add a CSP to control which sources can run scripts — the strongest single defense against XSS.

  • No H1 heading found

    SEO

    Add exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.

  • robots.txt not found

    SEO

    Publish /robots.txt with a Sitemap: directive to guide crawlers.

  • sitemap.xml not found

    SEO

    Publish an XML sitemap and reference it from robots.txt to speed up page discovery.

  • 20 broken links on the page

    SEO

    Fix or remove broken links — they waste crawl budget and erode user trust.

80

SEO

3 issue(s) found

100

Performance

312 ms

90

Security

HTTPS & header checks

90

Accessibility

1 issue(s) found

Score history

-3 overall since Jul 21, 2026

Overall
90
SEO
80
Security
90
Performance
100
Accessibility
90

Organization

Company details published in this site's own structured data.

Accurate, up-to-date, comprehensive cancer information from the U.S. government's principal agency for cancer research.

FacebookX (Twitter)InstagramYouTubeLinkedIn

Contact

Email, phone, and address published on this site's own pages.

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

OpenGraph & Twitter Card

OpenGraph

og:title
Comprehensive Cancer Information
og:description
Accurate, up-to-date, comprehensive cancer information from the U.S. government's principal agency for cancer research.
og:type
Website
og:url
https://www.cancer.gov/

Twitter Card

twitter:card
summary
twitter:title
—
twitter:description
—

Technologies

Detected frameworks, languages, and tools.

Nginx

Hosting & CDN

Hosting provider
—
CDN provider
—
IP address
—
ASN
—

DNS records

TypeValue
A—
AAAA—
MX—
TXT—
NS—
CAA—
CNAME—
IPv6 supportNo

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
34
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

34 internal · 12 external · 20 broken

Images

14 total · 0 missing alt

Scripts / Styles

5 scripts · 4 stylesheets

JS / CSS size

1.1 KB · 146 B

Page size

43.8 KB

Robots.txt & Sitemap

robots.txt
Not found
Disallow rules
0
sitemap.xml
Not found
URLs in sitemap
0

SEO issues

  • No H1 heading found
  • robots.txt not found
  • sitemap.xml not 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
312 ms
HTML size
43.8 KB
Redirect chain
https://cancer.gov → https://www.cancer.gov/

See something wrong on this report? Request a correction

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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?
Hosting provider information for cancer.gov is not available yet.
What is cancer.gov's SEO score?
cancer.gov scored 80/100 for SEO in the latest analysis (great).
What is cancer.gov's overall website score?
cancer.gov has an overall SiteGraph score of 90/100, combining SEO, performance, security, and accessibility.
Has cancer.gov's score changed over time?
cancer.gov's overall score has declined by 3 points (from 93 to 90) since Jul 21, 2026.