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Domain report

rdrr.io

rdrr.io ranks in the top 0.29% of domains by connectivity (Common Crawl, cc-main-2026-jul-aug-sep), with 2 distinct hosts observed under it.

Explore rdrr.io in the Web Graph

Connectivity

#391,358harmonic-centrality rank
Top percentile
0.29%
Hosts observed
2

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://rdrr.io/ answered with HTTP 200.

DNS records

A
  • 51.81.83.12
AAAA
No records found.
MX
  • 1 aspmx.l.google.com.
  • 10 alt3.aspmx.l.google.com.
  • 10 alt4.aspmx.l.google.com.
  • 5 alt1.aspmx.l.google.com.
  • 5 alt2.aspmx.l.google.com.
NS
  • ns-1181.awsdns-19.org.
  • ns-15.awsdns-01.com.
  • ns-1820.awsdns-35.co.uk.
  • ns-669.awsdns-19.net.

Live preview

Screenshot of rdrr.io

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

Since rdrr.io 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)

RDAP lookup failed (HTTP 429).

How to read WHOIS and RDAP data

SSL certificate

Certificate Transparency lookup failed (HTTP 429).

How to check when a certificate expires

HTTP & security headers

Response

Server
cloudflare
Content-Type
text/html; charset=utf-8
Cache-Control
s-maxage=3600, public, max-age=3600
Content-Encoding
Not sent

Security

Content-Security-Policy
Not sent
Strict-Transport-Security
max-age=15724800; includeSubDomains
X-Frame-Options
SAMEORIGIN
X-Content-Type-Options
Not sent
Referrer-Policy
Not sent
Permissions-Policy
Not sent

What each security header does

Redirect chain

  1. 1.http://rdrr.io/HTTP 308

    → https://rdrr.io/

  2. 2.https://rdrr.io/HTTP 200

Meta tags

Title
R Package Documentation
Description
A comprehensive index of R packages and documentation from CRAN, Bioconductor, GitHub and R-Forge.
Canonical
https://rdrr.io/
Robots
Not set
Generator
Not set
Open Graph title
R Package Documentation
Open Graph description
A comprehensive index of R packages and documentation from CRAN, Bioconductor, GitHub and R-Forge.
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: *)
0
Disallow rules (other agents)
0

Sitemap declared:

  • https://rdrr.io/sitemap.xml

Technology detected

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

  • Cloudflarecdn

    Server: cloudflare

  • Google Analyticsanalytics

    Found "googletagmanager.com/gtag/js" in the page's HTML

Related domains

Similar connectivity

Domains ranked just above and below it in the same snapshot.