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Domain report

polytechnique.org

polytechnique.org ranks in the top 0.32% of domains by connectivity (Common Crawl, cc-main-2026-jul-aug-sep), with 114 distinct hosts observed under it.

Explore polytechnique.org in the Web Graph

Connectivity

#427,358harmonic-centrality rank
Top percentile
0.32%
Hosts observed
114

From the Common Crawl cc-main-2026-jul-aug-sep hyperlink graph, 133,241,980 domains total. What this rank means

HTTPS reachability

200HTTP status

https://polytechnique.org/ answered with HTTP 200.

Certificate until 2026-11-11C=US, O=Let's Encrypt, CN=YR2

DNS records

A
  • 91.121.62.108
AAAA
No records found.
MX
  • 0 mx2.polytechnique.org.
  • 5 mx3.polytechnique.org.
NS
  • ns1.polytechnique.org.
  • ns2.polytechnique.org.
  • ns3.polytechnique.org.
AS
Server in network OVH, AS16276 · France91.121.62.0/24, which holds 91.121.62.108

Live preview

This is a live, sandboxed embed of polytechnique.org — not a copy. What it shows can change any time the site itself does.

Domain registration (WHOIS / RDAP)

Registrar
OVH sas
Registered
1999-02-13
Expires
2027-02-13
Last changed
2026-08-12

Nameservers: ns1.polytechnique.org, ns2.polytechnique.org, ns3.polytechnique.org

Status: client delete prohibited, client transfer prohibited

How to read WHOIS and RDAP data

SSL certificate

Common name
*.polytechnique.org
Issuer
C=US, O=Let's Encrypt, CN=YR2
Valid from
2026-08-13
Valid until
2026-11-11

Matches polytechnique.org exactly. Source: Certificate Transparency logs (crt.sh).

How to check when a certificate expires

HTTP & security headers

Response

Server
cloudflare
Content-Type
text/html; charset=UTF-8
Cache-Control
no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Content-Encoding
Not sent

Security

Content-Security-Policy
Not sent
Strict-Transport-Security
Not sent
X-Frame-Options
Not sent
X-Content-Type-Options
Not sent
Referrer-Policy
Not sent
Permissions-Policy
Not sent

What each security header does

Redirect chain

  1. 1.http://polytechnique.org/HTTP 301

    → https://www.polytechnique.org/

  2. 2.https://www.polytechnique.org/HTTP 200

Meta tags

Title
Polytechnique.org :: le site des élèves et anciens élèves de l'École polytechnique
Description
Le Portail des Polytechniciens
Canonical
Not set
Robots
Not set
Generator
Not set
Open Graph title
Not set
Open Graph description
Not set
Open Graph image
Not set
Open Graph type
Not set
Twitter card
Not set
Twitter title
Not set
Twitter image
Not set

robots.txt

Disallow rules (User-agent: *)
9
Disallow rules (other agents)
0

No Sitemap declared in robots.txt.

Technology detected

Best-effort, based on a small set of well-known signals — this may be incomplete.

  • Cloudflarecdn

    Server: cloudflare

  • PHPother

    Cookie set: PHPSESSID

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