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Domain report

had2know.com

had2know.com ranks in the top 0.57% of domains by connectivity (Common Crawl, cc-main-2026-jul-aug-sep), with 2 distinct hosts observed under it.

Explore had2know.com in the Web Graph

Connectivity

#758,417harmonic-centrality rank
Top percentile
0.57%
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://had2know.com/ answered with HTTP 200.

DNS records

A
  • 194.110.243.35
AAAA
  • 2a00:b980:3:9::35
MX
  • 0 had2know.com.
NS
  • ns101.layerip.com.
  • ns100.layerip.com.

Live preview

This is a live, sandboxed embed of had2know.com — not a copy. What it shows can change any time the site itself does.

Domain registration (WHOIS / RDAP)

Registrar
PDR Ltd. d/b/a PublicDomainRegistry.com
Registered
2010-01-14
Expires
2027-01-14
Last changed
2025-12-29

Nameservers: NS100.LAYERIP.COM, NS101.LAYERIP.COM

Status: client transfer prohibited

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
private, max-age=0, must-revalidate, no-cache, no-store
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://had2know.com/HTTP 301

    → https://www.had2know.org/

  2. 2.https://www.had2know.org/HTTP 200

Meta tags

Title
Had2Know - Free Online Calculators and How-to Guides
Description
Had2Know.org Homepage -- Browse our article categories and index of online calculators. You had to know about...
Canonical
https://www.had2know.org/
Robots
all
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: *)
0
Disallow rules (other agents)
0

Sitemap declared:

  • https://www.had2know.org/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

  • PHPother

    Cookie set: PHPSESSID

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