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Domain report

gerf.org

gerf.org ranks in the top 0.43% of domains by connectivity (Common Crawl, cc-main-2026-jul-aug-sep), with 7 distinct hosts observed under it.

Explore gerf.org in the Web Graph

Connectivity

#569,885harmonic-centrality rank
Top percentile
0.43%
Hosts observed
7

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://gerf.org/ answered with HTTP 200.

DNS records

A
  • 173.255.230.223
AAAA
  • 2600:3c03::f03c:91ff:fe56:7485
MX
  • 10 mx01.mail.icloud.com.
  • 10 mx02.mail.icloud.com.
NS
  • ns3.linode.com.
  • ns5.linode.com.
  • ns1.linode.com.
  • ns2.linode.com.
  • ns4.linode.com.

Live preview

Screenshot of gerf.org

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

Since gerf.org 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
Not sent
Content-Encoding
Not sent

Security

Content-Security-Policy
Not sent
Strict-Transport-Security
max-age=31536000; includeSubDomains; preload
X-Frame-Options
DENY
X-Content-Type-Options
nosniff
Referrer-Policy
no-referrer-when-downgrade
Permissions-Policy
Not sent

What each security header does

Redirect chain

  1. 1.http://gerf.org/HTTP 308

    → https://gerf.org/

  2. 2.https://gerf.org/HTTP 302

    → https://docwhat.org/

  3. 3.https://docwhat.org/HTTP 200

Meta tags

Title
docwhat's blog
Description
Not set
Canonical
https://docwhat.org
Robots
Not set
Generator
Gatsby 4.25.7
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: *)
1
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

  • Gatsbyframework

    Found "__gatsby" in the page's HTML

  • Google Analyticsanalytics

    Found "www.google-analytics.com" in the page's HTML

Related domains

Similar connectivity

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