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ioccc.org

The International Obfuscated C Code Contest

Last scanned Aug 24, 2026, 1:23 PM

87

Overall score

Great

Summary

International Obfuscated C Code Contest. This website is hosted on Fastly. SEO is good (85/100) and accessibility is excellent (100/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Multiple H1 headings found.

International Obfuscated C Code Contest

United States
Hosted on Fastly

Top issues to fix

6 issues found · 2 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 X-Content-Type-Options header

    Security

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

  • Missing X-Frame-Options header

    Security

    Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.

  • Multiple H1 headings found

    SEO

    Keep a single H1 per page and demote the others to H2/H3.

  • No structured data (JSON-LD) found

    SEO

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

85

SEO

2 issue(s) found

100

Performance

454 ms

65

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.

International Obfuscated C Code Contest

YouTubeYouTube

Contact

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

Source: https://www.ioccc.org/location.html

Meta tags

Title
The International Obfuscated C Code Contest
Description
International Obfuscated C Code Contest
Canonical
https://www.ioccc.org/index.html
Language
en
Charset
utf-8
Viewport
width=device-width, initial-scale=1.0, user-scalable=yes
Robots meta
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
The International Obfuscated C Code Contest
og:description
International Obfuscated C Code Contest
og:type
website
og:url
https://www.ioccc.org/index.html

Twitter Card

twitter:card
summary_large_image
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
  • 185.199.110.153
  • 185.199.111.153
  • 185.199.109.153
AAAA
  • 2606:50c0:8000::153
  • 2606:50c0:8001::153
  • 2606:50c0:8002::153
  • 2606:50c0:8003::153
MX—
TXT—
NS—
CAA
  • 0 issuewild "digicert.com"
  • 0 issue "digicert.com"
  • 0 issuewild "letsencrypt.org"
  • 0 issuewild "sectigo.com"
  • 0 issue "sectigo.com"
  • 0 issue "letsencrypt.org"
CNAME
  • ioccc-src.github.io
IPv6 supportYes

TLS / SSL certificate

Version
TLS 1.3
Issuer
Let's Encrypt
Subject
www.ioccc.org
Valid from
Aug 22, 2026
Valid to
Nov 20, 2026
Days until expiry
87
SAN domains
ioccc.org, www.ioccc.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 9 · H2 2 · H3 0

Links

30 internal · 12 external · 0 broken

Images

14 total · 0 missing alt

Scripts / Styles

1 scripts · 2 stylesheets

JS / CSS size

1.1 KB · 22.5 KB

Page size

23.4 KB

Robots.txt & Sitemap

robots.txt
Found
Disallow rules
2
sitemap.xml
Found
URLs in sitemap
4592

SEO issues

  • Multiple H1 headings found
  • No structured data (JSON-LD) found

Accessibility issues

No accessibility issues detected.

Scan details

Requested URL
https://ioccc.org
Final URL
https://www.ioccc.org/
HTTP status
200
HTTP version
HTTP/2
Response time
454 ms
HTML size
23.4 KB
Redirect chain
https://ioccc.org → https://www.ioccc.org/

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Frequently asked questions

What technology does ioccc.org use?
We did not detect any specific technologies for ioccc.org in the latest scan.
Is ioccc.org secure (HTTPS)?
Yes. ioccc.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Nov 20, 2026.
Who hosts ioccc.org?
ioccc.org is hosted on Fastly, behind Fastly CDN.
What is ioccc.org's SEO score?
ioccc.org scored 85/100 for SEO in the latest analysis (great).
What is ioccc.org's overall website score?
ioccc.org has an overall SiteGraph score of 87/100, combining SEO, performance, security, and accessibility.