Skip to main content
SGSiteGraph

deeplearningbook.org

Deep Learning

Last scanned Jul 27, 2026, 1:43 PM · 1 view

61

Overall score

Fair

Summary

This website is hosted on Fastly. SEO is fair (60/100) and accessibility is good (85/100). Security scores poor (25/100) and performance good (80/100). Top issue: Missing meta description.

United States
Hosted on Fastly

Top issues to fix

14 issues found · 5 high priority

  • Missing Strict-Transport-Security header

    Security

    Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.

  • Missing Content-Security-Policy header

    Security

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

  • Missing meta description

    SEO

    Add a ~150-character meta description to control your search-result snippet and lift click-through rate.

  • Missing viewport meta tag

    Accessibility

    Add <meta name="viewport" content="width=device-width, initial-scale=1"> — without it the site is broken on mobile.

  • Slow estimated load (6.8s)

    Performance

    Use a CDN, enable caching/compression, and cut render-blocking assets — every extra second costs conversions.

  • Missing X-Content-Type-Options header

    Security

    Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.

+8 more issues — details in the sections below.

60

SEO

6 issue(s) found

80

Performance

6.78 s

25

Security

HTTPS & header checks

85

Accessibility

2 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

Contact

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

Meta tags

Title
Deep Learning
Description
Canonical
Language
Charset
ISO-8859-1
Viewport
Robots meta
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
—
og:description
—
og:type
—
og:url
—

Twitter Card

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

Technologies

Detected frameworks, languages, and tools.

No technologies detected.

Hosting & CDN

Hosting provider
Fastly
CDN provider
Fastly
IP address
185.199.108.153
ASN
AS54113 (FASTLY - Fastly, Inc., US)

DNS records

TypeValue
A
  • 185.199.108.153
  • 185.199.109.153
  • 185.199.110.153
  • 185.199.111.153
AAAA
  • 2606:50c0:8001::153
  • 2606:50c0:8002::153
  • 2606:50c0:8000::153
  • 2606:50c0:8003::153
MX—
TXT—
NS—
CAA
  • 0 issue "digicert.com"
  • 0 issue "letsencrypt.org"
  • 0 issuewild "letsencrypt.org"
  • 0 issue "sectigo.com"
  • 0 issuewild "sectigo.com"
  • 0 issuewild "digicert.com"
CNAME
  • goodfeli.github.io
IPv6 supportYes

TLS / SSL certificate

Version
TLS 1.3
Issuer
Let's Encrypt
Subject
www.deeplearningbook.org
Valid from
Jun 29, 2026
Valid to
Sep 27, 2026
Days until expiry
62
SAN domains
www.deeplearningbook.org

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 4 · H3 1

Links

32 internal · 4 external · 1 broken

Images

0 total · 0 missing alt

Scripts / Styles

0 scripts · 0 stylesheets

JS / CSS size

0 B · 185 B

Page size

5.8 KB

Robots.txt & Sitemap

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

SEO issues

  • Missing meta description
  • Missing canonical link
  • No structured data (JSON-LD) found
  • Missing OpenGraph tags
  • robots.txt not found
  • sitemap.xml not found

Accessibility issues

  • Missing <html lang> attribute
  • Missing viewport meta tag

Scan details

Requested URL
https://deeplearningbook.org
Final URL
https://www.deeplearningbook.org/
HTTP status
200
HTTP version
HTTP/2
Response time
6.78 s
HTML size
5.8 KB
Redirect chain
https://deeplearningbook.org → https://www.deeplearningbook.org/

See something wrong on this report? Request a correction

Related websites

Same hosting provider

literams.com

Litera | Legal Technology Solutions

100
nginxdrupal
Fastly· Fastly

showare.com

Live Entertainment & Venues Ticketing & POS | accesso

100
wordpressjquerybootstrap
Fastly· Cloudflare

foresee.com

Predictive Analytics for Customer Experience | Verint

100
wordpressnginxjquery
Fastly· Fastly

voicemod.net

Free Real Time Voice Changer for PC & Mac | Voicemod

100
wordpressapachejquery
Fastly· Fastly

researchandmarkets.com

Research and Markets - Market Research Reports - Welcome

100
Fastly· Fastly

hallensteins.co.nz

Hallensteins | Menswear NZ

100
nginxphpjquery
Fastly· Fastly

Frequently asked questions

What technology does deeplearningbook.org use?
We did not detect any specific technologies for deeplearningbook.org in the latest scan.
Is deeplearningbook.org secure (HTTPS)?
Yes. deeplearningbook.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 27, 2026.
Who hosts deeplearningbook.org?
deeplearningbook.org is hosted on Fastly, behind Fastly CDN.
What is deeplearningbook.org's SEO score?
deeplearningbook.org scored 60/100 for SEO in the latest analysis (fair).
What is deeplearningbook.org's overall website score?
deeplearningbook.org has an overall SiteGraph score of 61/100, combining SEO, performance, security, and accessibility.