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Domain report

fir.de

fir.de ranks in the top 0.39% of domains by connectivity (Common Crawl, cc-main-2026-jul-aug-sep), with 256 distinct hosts observed under it.

Explore fir.de in the Web Graph

Connectivity

#513,364harmonic-centrality rank
Top percentile
0.39%
Hosts observed
256

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

HTTPS reachability

521HTTP status

https://fir.de/ answered with HTTP 521.

Certificate until 2026-11-29C=US, O=Let's Encrypt, CN=YE1

DNS records

A
  • 134.130.93.45
AAAA
No records found.
MX
No records found.
NS
  • nsd4.schlundtech.de.
  • nsb4.schlundtech.de.
  • nsa4.schlundtech.de.
  • nsc4.schlundtech.de.
AS
Server in network RWTH-AS, AS47610 · Germany134.130.93.0/24, which holds 134.130.93.45

Live preview

Screenshot of fir.de

This site sends "X-Frame-Options: SAMEORIGIN", which blocks embedding it here.

Since fir.de can't be embedded live, this is a captured screenshot instead — a snapshot from whenever it was last rendered, not necessarily this exact moment.

Domain registration (WHOIS / RDAP)

No RDAP (WHOIS) data is available for fir.de.

How to read WHOIS and RDAP data

SSL certificate

Common name
fir.de
Issuer
C=US, O=Let's Encrypt, CN=YE1
Valid from
2026-08-31
Valid until
2026-11-29

Matches fir.de exactly. Source: Certificate Transparency logs (crt.sh).

How to check when a certificate expires

HTTP & security headers

Response

Server
cloudflare
Content-Type
text/plain; charset=UTF-8
Cache-Control
private, max-age=0, 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
SAMEORIGIN
X-Content-Type-Options
Not sent
Referrer-Policy
same-origin
Permissions-Policy
Not sent

What each security header does

Redirect chain

  1. 1.http://fir.de/HTTP 302

    → https://www.fir.rwth-aachen.de/

  2. 2.https://www.fir.rwth-aachen.de/HTTP 521

Meta tags

Title
Not set
Description
Not set
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

robots.txt request failed (HTTP 521).

Technology detected

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

  • Cloudflarecdn

    Server: cloudflare

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