grc.com
Home of Gibson Research Corporation
Last scanned Jul 26, 2026, 12:25 AM · 1 view
Overall score
Great
Summary
Steve Gibson's and Gibson Research Corporation's Web homepage. This website uses Google Analytics hosted on LEVEL3 - Level 3 Parent, LLC, US. SEO is fair (65/100) and accessibility is good (85/100). Security scores good (85/100) and performance excellent (100/100). Top issue: Missing canonical link.
Steve Gibson's and Gibson Research Corporation's Web homepage.
- United States
- Hosted on LEVEL3 - Level 3 Parent, LLC, US
Top issues to fix
10 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.
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.
Missing viewport meta tag
AccessibilityAdd <meta name="viewport" content="width=device-width, initial-scale=1"> — without it the site is broken on mobile.
TLS certificate expires in 28 days
SecurityRenew soon or enable auto-renewal to avoid a browser-warning outage.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
2 cookies without Secure/HttpOnly flags
SecuritySet Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.
+4 more issues — details in the sections below.
SEO
5 issue(s) found
Performance
674 ms
Security
HTTPS & header checks
Accessibility
2 issue(s) found
Organization
Company details published in this site's own structured data.
Steve Gibson's and Gibson Research Corporation's Web homepage.
Contact
Email, phone, and address published on this site's own pages.
Source: https://www.grc.com/sales.htm
Meta tags
- Title
- Home of Gibson Research Corporation
- Description
- Steve Gibson's and Gibson Research Corporation's Web homepage.
- Canonical
- Language
- en
- Charset
- UTF-8
- Viewport
- Robots meta
- Manifest
- https://www.grc.com/manifest.json
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- LEVEL3 - Level 3 Parent, LLC, US
- CDN provider
- —
- IP address
- 4.79.142.202
- ASN
- AS3356 (LEVEL3 - Level 3 Parent, LLC, US)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA | — |
| MX | — |
| TXT | — |
| NS | — |
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.2
- Issuer
- DigiCert Inc
- Subject
- grc.com
- Valid from
- Jul 23, 2025
- Valid to
- Aug 23, 2026
- Days until expiry
- 28
- SAN domains
- grc.com, *.grc.com, grctech.com, *.grctech.com, grc.sc, breath.cafe, biotech.cafe
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyMissing
- X-Frame-OptionsEnabled
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 2 cookie(s) observed
Content & assets
Headings
H1 0 · H2 0 · H3 0
Links
74 internal · 1 external · 0 broken
Images
10 total · 0 missing alt
Scripts / Styles
3 scripts · 4 stylesheets
JS / CSS size
153 B · 34.7 KB
Page size
12.3 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 4
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Missing canonical link
- No H1 heading found
- No structured data (JSON-LD) found
- Missing OpenGraph tags
- sitemap.xml not found
Accessibility issues
- No H1 heading found
- Missing viewport meta tag
Scan details
- Requested URL
- https://grc.com
- Final URL
- https://www.grc.com/intro.htm
- HTTP status
- 200
- HTTP version
- HTTP/1.1
- Response time
- 674 ms
- HTML size
- 12.3 KB
- Redirect chain
- https://grc.com → https://www.grc.com/intro.htm
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does grc.com use?
- grc.com is built with Google Analytics.
- Is grc.com secure (HTTPS)?
- Yes. grc.com uses TLS 1.2 with a certificate issued by DigiCert Inc, valid until Aug 23, 2026.
- Who hosts grc.com?
- grc.com is hosted on LEVEL3 - Level 3 Parent, LLC, US.
- What is grc.com's SEO score?
- grc.com scored 65/100 for SEO in the latest analysis (fair).
- What is grc.com's overall website score?
- grc.com has an overall SiteGraph score of 83/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card