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defcon.org

DEF CON® Hacking Conference Home

Last scanned Jul 26, 2026, 5:18 AM

94

Overall score

Excellent

Summary

The largest hacking and security conference with presentations, workshops, contests, villages and the premier Capture The Flag Contest. This website is hosted on COMCAST-7922 - Comcast Cable Communications, LLC, US. SEO is good (80/100) and accessibility is excellent (100/100). Security scores excellent (100/100) and performance excellent (100/100). Top issue: Missing canonical link.

The largest hacking and security conference with presentations, workshops, contests, villages and the premier Capture The Flag Contest.

United States
Hosted on COMCAST-7922 - Comcast Cable Communications, LLC, US

Top issues to fix

4 issues found

  • Missing canonical link

    SEO

    Add <link rel="canonical"> so search engines know which URL variant to index.

  • No structured data (JSON-LD) found

    SEO

    Add JSON-LD (Organization, Article, Product…) to become eligible for rich results.

  • sitemap.xml not found

    SEO

    Publish an XML sitemap and reference it from robots.txt to speed up page discovery.

  • 3 broken links on the page

    SEO

    Fix or remove broken links — they waste crawl budget and erode user trust.

80

SEO

3 issue(s) found

100

Performance

262 ms

100

Security

HTTPS & header checks

100

Accessibility

0 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.

Organization

Company details published in this site's own structured data.

The largest hacking and security conference with presentations, workshops, contests, villages and the premier Capture The Flag Contest.

FacebookYouTubeInstagramYouTube

Contact

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

Meta tags

Title
DEF CON® Hacking Conference Home
Description
The largest hacking and security conference with presentations, workshops, contests, villages and the premier Capture The Flag Contest.
Canonical
Language
en
Charset
UTF-8
Viewport
width=device-width, initial-scale=1
Robots meta
max-snippet:-1, max-image-preview:large, max-video-preview:-1, index, follow
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
defcon.org
og:description
The largest hacking and security conference with presentations, workshops, contests, villages and the premier Capture The Flag Contest.
og:type
website
og:url
https://defcon.org/

Twitter Card

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

Technologies

Detected frameworks, languages, and tools.

No technologies detected.

Hosting & CDN

CDN provider
—
IP address
50.230.231.78
ASN
AS7922 (COMCAST-7922 - Comcast Cable Communications, LLC, US)

DNS records

TypeValue
A
  • 50.230.231.78
AAAA
  • 2001:559:327:231::78
MX
  • mail-1.datamerica.com
  • mail-2.datamerica.com
TXT
  • security_contact=mailto:security@defcon.org
  • google-site-verification=d5Wqya3G077LcmFPN-VE5ZqQJxXCqKTgSkU1ATIJBks
  • v=spf1 a:mail-1.datamerica.com a:mail-2.datamerica.com -all
  • security_policy=https://defcon.org/html/links/disclosure-policy.html
NS
  • dns-1.datamerica.com
  • dns-3.datamerica.com
CAA
  • 0 issue "harica.gr"
CNAME—
IPv6 supportYes

TLS / SSL certificate

Version
TLS 1.3
Issuer
Hellenic Academic and Research Institutions CA
Subject
defcon.org
Valid from
Mar 3, 2026
Valid to
Mar 3, 2027
Days until expiry
219
SAN domains
defcon.org, www.defcon.org, www.defcon.social, dcnextgen.org, www.dcnextgen.org, defcongroups.org, www.defcongroups.org, mta-sts.defcon.org, mta-sts.datamerica.com, infocon.org, www.infocon.org, media.defcon.org

Security headers

  • Strict-Transport-SecurityEnabled
  • Content-Security-PolicyEnabled
  • X-Frame-OptionsEnabled
  • X-Content-Type-OptionsEnabled
  • Referrer-PolicyEnabled
  • Permissions-PolicyEnabled

Compression: none · 0 cookie(s) observed

Content & assets

Headings

H1 1 · H2 22 · H3 12

Links

46 internal · 49 external · 3 broken

Images

45 total · 0 missing alt

Scripts / Styles

2 scripts · 3 stylesheets

JS / CSS size

2.3 KB · 0 B

Page size

52.0 KB

Robots.txt & Sitemap

robots.txt
Found
Disallow rules
1
sitemap.xml
Not found
URLs in sitemap
0

SEO issues

  • Missing canonical link
  • No structured data (JSON-LD) found
  • sitemap.xml not found

Accessibility issues

No accessibility issues detected.

Scan details

Requested URL
https://defcon.org
Final URL
https://defcon.org
HTTP status
200
HTTP version
HTTP/2
Response time
261 ms
HTML size
52.0 KB
Redirect chain
https://defcon.org

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Frequently asked questions

What technology does defcon.org use?
We did not detect any specific technologies for defcon.org in the latest scan.
Is defcon.org secure (HTTPS)?
Yes. defcon.org uses TLS 1.3 with a certificate issued by Hellenic Academic and Research Institutions CA, valid until Mar 3, 2027.
Who hosts defcon.org?
defcon.org is hosted on COMCAST-7922 - Comcast Cable Communications, LLC, US.
What is defcon.org's SEO score?
defcon.org scored 80/100 for SEO in the latest analysis (great).
What is defcon.org's overall website score?
defcon.org has an overall SiteGraph score of 94/100, combining SEO, performance, security, and accessibility.