hacker101.com
Home | Hacker101
Last scanned Jul 27, 2026, 9:43 AM · 1 view
Overall score
Excellent
Summary
Hacker101 is a free class for web security. This website uses Google Analytics hosted on Fastly behind Fastly CDN. SEO is excellent (95/100) and accessibility is excellent (100/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Meta description longer than 160 characters.
Hacker101 is a free class for web security. Whether you’re a programmer with an interest in bug bounties or a seasoned security professional, Hacker101 has something to teach you.
- United States
- Hosted on Fastly
Top issues to fix
6 issues found · 2 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
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.
2 broken links on the page
SEOFix or remove broken links — they waste crawl budget and erode user trust.
SEO
1 issue(s) found
Performance
9 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
Hacker101 is a free class for web security. Whether you’re a programmer with an interest in bug bounties or a seasoned security professional, Hacker101 has something to teach you.
Meta tags
- Title
- Home | Hacker101
- Description
- Hacker101 is a free class for web security. Whether you’re a programmer with an interest in bug bounties or a seasoned security professional, Hacker101 has something to teach you.
- Canonical
- https://www.hacker101.com/
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, user-scalable=yes, initial-scale=1
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
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.hacker101.com
- Valid from
- Jun 27, 2026
- Valid to
- Sep 25, 2026
- Days until expiry
- 60
- SAN domains
- www.hacker101.com
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 1 · H2 2 · H3 0
Links
5 internal · 5 external · 2 broken
Images
9 total · 0 missing alt
Scripts / Styles
7 scripts · 1 stylesheets
JS / CSS size
171 KB · 155 KB
Page size
7.6 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 0
- sitemap.xml
- Found
- URLs in sitemap
- 101
SEO issues
- Meta description longer than 160 characters
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://hacker101.com
- Final URL
- https://www.hacker101.com
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 9 ms
- HTML size
- 7.6 KB
- Redirect chain
- https://hacker101.com → https://www.hacker101.com
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does hacker101.com use?
- hacker101.com is built with Bootstrap, jQuery, Google Analytics.
- Is hacker101.com secure (HTTPS)?
- Yes. hacker101.com uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 25, 2026.
- Who hosts hacker101.com?
- hacker101.com is hosted on Fastly, behind Fastly CDN.
- What is hacker101.com's SEO score?
- hacker101.com scored 95/100 for SEO in the latest analysis (excellent).
- What is hacker101.com's overall website score?
- hacker101.com has an overall SiteGraph score of 90/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card