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SGSiteGraph

codeforces.com

Just a moment...

Last scanned Jul 21, 2026, 12:33 PM · 1 view

82

Overall score

Great

Top issues to fix

8 issues found · 2 high priority

  • 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.

  • 3 cookies without Secure/HttpOnly flags

    Security

    Set Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.

  • 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.

  • Missing OpenGraph tags

    SEO

    Add og:title/og:description/og:image so shared links render a proper preview card.

+2 more issues — details in the sections below.

Summary

This website is hosted on Cloudflare. SEO is fair (65/100) and accessibility is excellent (100/100). Security scores excellent (90/100) and performance good (80/100). Top issue: Missing meta description.

65

SEO

5 issue(s) found

80

Performance

3.50 s

90

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.

Contact

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

Source: https://codeforces.com/help

Meta tags

Title
Just a moment...
Description
Canonical
Language
en-US
Charset
UTF-8
Viewport
width=device-width,initial-scale=1
Robots meta
noindex,nofollow
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
Cloudflare
CDN provider
Cloudflare
IP address
104.26.6.164
ASN
AS13335 (CLOUDFLARENET - Cloudflare, Inc., US)

DNS records

TypeValue
A
  • 104.26.6.164
  • 172.67.68.254
  • 104.26.7.164
AAAA
  • 2606:4700:20::681a:6a4
  • 2606:4700:20::681a:7a4
  • 2606:4700:20::ac43:44fe
MX
  • mx.yandex.net
TXT
  • loaderio=17e74635884b3872197928c7ea0123c5
  • google-site-verification=l4G0k0hCtL44oR2JYae12tG2VSyD0ig5OEN4oKGz6IY
  • v=spf1 ip4:77.234.204.67 ip4:95.163.252.67 include:_spf.yandex.net -all
NS
  • fred.ns.cloudflare.com
  • jean.ns.cloudflare.com
CAA—
CNAME—
IPv6 supportYes

TLS / SSL certificate

Version
TLS 1.3
Issuer
Google Trust Services
Subject
codeforces.com
Valid from
Jul 1, 2026
Valid to
Sep 29, 2026
Days until expiry
69
SAN domains
codeforces.com, *.codeforces.com

Security headers

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

Compression: gzip · 3 cookie(s) observed

Content & assets

Headings

H1 1 · H2 2 · H3 0

Links

0 internal · 2 external · 0 broken

Images

1 total · 0 missing alt

Scripts / Styles

3 scripts · 0 stylesheets

JS / CSS size

292 KB · 20.4 KB

Page size

179 KB

Robots.txt & Sitemap

robots.txt
Found
Disallow rules
120
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
  • sitemap.xml not found

Accessibility issues

No accessibility issues detected.

Scan details

Requested URL
https://codeforces.com
Final URL
https://codeforces.com
HTTP status
200
HTTP version
HTTP/2
Response time
3.50 s
HTML size
179 KB
Redirect chain
https://codeforces.com

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Frequently asked questions

What technology does codeforces.com use?
We did not detect any specific technologies for codeforces.com in the latest scan.
Is codeforces.com secure (HTTPS)?
Yes. codeforces.com uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Sep 29, 2026.
Who hosts codeforces.com?
codeforces.com is hosted on Cloudflare, behind Cloudflare CDN.
What is codeforces.com's SEO score?
codeforces.com scored 65/100 for SEO in the latest analysis (fair).
What is codeforces.com's overall website score?
codeforces.com has an overall SiteGraph score of 82/100, combining SEO, performance, security, and accessibility.