npl.co.uk
National Physical Laboratory - impact from science - NPL
Last scanned Aug 5, 2026, 12:00 PM · 12 views
Overall score
Great
Summary
National Physical Laboratory (NPL) is the UK’s National Metrology Institute, providing the measurement capability that underpins the UK’s prosperity and quality of life. This website uses Google Analytics hosted on AS-VULTR - The Constant Company, LLC, US. SEO is good (85/100) and accessibility is good (85/100). Security scores excellent (90/100) and performance excellent (90/100). Top issue: Meta description longer than 160 characters.
National Physical Laboratory (NPL) is the UK’s National Metrology Institute, providing the measurement capability that underpins the UK’s prosperity and quality of life.
- United States
- Hosted on AS-VULTR - The Constant Company, LLC, US
Top issues to fix
4 issues found
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.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
More than 20% of images are missing alt text
AccessibilityAdd alt attributes to the remaining images (use alt="" for purely decorative ones).
SEO
2 issue(s) found
Performance
601 ms
Security
HTTPS & header checks
Accessibility
1 issue(s) found
Score history
0 overall since Jul 26, 2026
- Overall
- 88
- SEO
- 85
- Security
- 90
- Performance
- 90
- Accessibility
- 85
Organization
Company details published in this site's own structured data.
National Physical Laboratory (NPL) is the UK’s National Metrology Institute, providing the measurement capability that underpins the UK’s prosperity and quality of life.
Meta tags
- Title
- National Physical Laboratory - impact from science - NPL
- Description
- National Physical Laboratory (NPL) is the UK’s National Metrology Institute, providing the measurement capability that underpins the UK’s prosperity and quality of life.
- Canonical
- https://www.npl.co.uk/
- Language
- en
- Charset
- UTF-8
- Viewport
- width=device-width, initial-scale=1, viewport-fit=cover
- Robots meta
- Manifest
- https://www.npl.co.uk/assets/favicons/webmanifest.json
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- AS-VULTR - The Constant Company, LLC, US
- CDN provider
- —
- IP address
- 65.20.91.231
- ASN
- AS20473 (AS-VULTR - The Constant Company, LLC, US)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA |
|
| MX | — |
| TXT | — |
| NS | — |
| CAA | — |
| CNAME |
|
| IPv6 support | Yes |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Sectigo Limited
- Subject
- *.npl.co.uk
- Valid from
- Jun 29, 2026
- Valid to
- Jan 13, 2027
- Days until expiry
- 161
- SAN domains
- *.npl.co.uk, npl.co.uk
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyEnabled
- X-Frame-OptionsMissing
- X-Content-Type-OptionsEnabled
- Referrer-PolicyEnabled
- Permissions-PolicyEnabled
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 1 · H2 22 · H3 8
Links
96 internal · 10 external · 0 broken
Images
24 total · 7 missing alt
Scripts / Styles
25 scripts · 3 stylesheets
JS / CSS size
304 KB · 1.4 MB
Page size
112 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 4
- sitemap.xml
- Found
- URLs in sitemap
- 116
SEO issues
- Meta description longer than 160 characters
- No structured data (JSON-LD) found
Accessibility issues
- More than 20% of images are missing alt text
Scan details
- Requested URL
- https://npl.co.uk
- Final URL
- https://www.npl.co.uk/
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 599 ms
- HTML size
- 112 KB
- Redirect chain
- https://npl.co.uk → https://www.npl.co.uk/
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Frequently asked questions
- What technology does npl.co.uk use?
- npl.co.uk is built with jQuery, Google Analytics, Google Ads.
- Is npl.co.uk secure (HTTPS)?
- Yes. npl.co.uk uses TLS 1.3 with a certificate issued by Sectigo Limited, valid until Jan 13, 2027.
- Who hosts npl.co.uk?
- npl.co.uk is hosted on AS-VULTR - The Constant Company, LLC, US.
- What is npl.co.uk's SEO score?
- npl.co.uk scored 85/100 for SEO in the latest analysis (great).
- What is npl.co.uk's overall website score?
- npl.co.uk has an overall SiteGraph score of 88/100, combining SEO, performance, security, and accessibility.
- Has npl.co.uk's score changed over time?
- npl.co.uk's overall score has stayed steady at 88/100 since Jul 26, 2026.
OpenGraph & Twitter Card
OpenGraph
Twitter Card