nersc.gov
Home | NERSC
Last scanned Jul 26, 2026, 1:49 PM
Overall score
Great
Summary
NERSC is the mission computing facility for the DOE Office of Science. This website uses Google Analytics behind Cloudflare CDN. SEO is good (80/100) and accessibility is good (85/100). Security scores good (75/100) and performance excellent (90/100). Top issue: Meta description longer than 160 characters.
NERSC is the mission computing facility for the DOE Office of Science. Eleven thousand scientists working on hundreds of projects rely on NERSC to power their results.
Top issues to fix
9 issues found · 1 high priority
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
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.
Meta description longer than 160 characters
SEOTrim the meta description to under 160 characters to avoid truncation in search results.
Multiple H1 headings found
SEOKeep a single H1 per page and demote the others to H2/H3.
robots.txt not found
SEOPublish /robots.txt with a Sitemap: directive to guide crawlers.
+3 more issues — details in the sections below.
SEO
4 issue(s) found
Performance
1.18 s
Security
HTTPS & header checks
Accessibility
1 issue(s) found
Organization
Company details published in this site's own structured data.
Meta tags
- Title
- Home | NERSC
- Description
- NERSC is the mission computing facility for the DOE Office of Science. Eleven thousand scientists working on hundreds of projects rely on NERSC to power their results.
- Canonical
- https://www.nersc.gov
- Language
- en-US
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1, shrink-to-fit=no
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- —
- CDN provider
- Cloudflare
- IP address
- —
- ASN
- —
DNS records
| Type | Value |
|---|---|
| A | — |
| AAAA | — |
| MX | — |
| TXT | — |
| NS | — |
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Let's Encrypt
- Subject
- www.nersc.gov
- Valid from
- Jun 18, 2026
- Valid to
- Sep 16, 2026
- Days until expiry
- 49
- SAN domains
- www.nersc.gov
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 1 cookie(s) observed
Content & assets
Headings
H1 7 · H2 2 · H3 8
Links
79 internal · 18 external · 15 broken
Images
26 total · 8 missing alt
Scripts / Styles
19 scripts · 9 stylesheets
JS / CSS size
1.7 KB · 0 B
Page size
146 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Meta description longer than 160 characters
- Multiple H1 headings found
- robots.txt not found
- sitemap.xml not found
Accessibility issues
- More than 20% of images are missing alt text
Scan details
- Requested URL
- https://nersc.gov
- Final URL
- https://www.nersc.gov/
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 1.18 s
- HTML size
- 146 KB
- Redirect chain
- https://nersc.gov → https://www.nersc.gov/
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Frequently asked questions
- What technology does nersc.gov use?
- nersc.gov is built with Bootstrap, jQuery, Google Analytics, Cloudflare Analytics.
- Is nersc.gov secure (HTTPS)?
- Yes. nersc.gov uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 16, 2026.
- Who hosts nersc.gov?
- Hosting provider information for nersc.gov is not available yet.
- What is nersc.gov's SEO score?
- nersc.gov scored 80/100 for SEO in the latest analysis (great).
- What is nersc.gov's overall website score?
- nersc.gov has an overall SiteGraph score of 82/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card