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Domain report

groups.io

groups.io ranks in the top 0.012% of domains by connectivity (Common Crawl, cc-main-2026-jul-aug-sep), with 1,225 distinct hosts observed under it.

Explore groups.io in the Web Graph

Connectivity

#15,505harmonic-centrality rank
Top percentile
0.012%
Hosts observed
1,225

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

DNS records

A
  • 45.79.81.153
  • 173.255.221.194
AAAA
No records found.
MX
  • 10 lb01.groups.io.
  • 10 lb02.groups.io.
NS
  • dns1.groups.io.
  • dns2.groups.io.

Live preview

Screenshot of groups.io

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

Since groups.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
Not sent
Content-Encoding
Not sent

Security

Content-Security-Policy
frame-ancestors 'self';
Strict-Transport-Security
Not sent
X-Frame-Options
DENY
X-Content-Type-Options
Not sent
Referrer-Policy
Not sent
Permissions-Policy
ch-ua-platform=(self), ch-ua-platform-version=(self), ch-ua-mobile=(self), ch-ua-model=(self), ch-ua-full-version-list=(self)

What each security header does

Redirect chain

  1. 1.http://groups.io/HTTP 302

    → https://groups.io/

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

Meta tags

Title
Groups.io | Email Discussion Groups & Listserv Alternative
Description
Groups.io is a modern email group service and listserv alternative with no ads. Create mailing lists with calendars, files, wikis, and more. Better than Google Groups or Yahoo Groups.
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: *)
4
Disallow rules (other agents)
5

Sitemaps declared:

  • https://groups.io/sitemap-general.xml
  • https://groups.io/sitemap-index0.xml
  • https://groups.io/sitemap-index1.xml
  • https://groups.io/sitemap-index2.xml
  • https://groups.io/sitemap-index3.xml
  • https://groups.io/sitemap-index4.xml
  • https://groups.io/sitemap-index5.xml
  • https://groups.io/sitemap-index6.xml
  • https://groups.io/sitemap-index7.xml
  • https://groups.io/sitemap-index8.xml
  • https://groups.io/sitemap-index9.xml
  • https://groups.io/sitemap-index10.xml
  • https://groups.io/sitemap-index11.xml
  • https://groups.io/sitemap-index12.xml
  • https://groups.io/sitemap-index13.xml
  • https://groups.io/sitemap-index14.xml
  • https://groups.io/sitemap-index15.xml
  • https://groups.io/sitemap-index16.xml
  • https://groups.io/sitemap-index17.xml
  • https://groups.io/sitemap-index18.xml
  • https://groups.io/sitemap-index19.xml
  • https://groups.io/sitemap-index20.xml
  • https://groups.io/sitemap-index21.xml
  • https://groups.io/sitemap-index22.xml
  • https://groups.io/sitemap-index23.xml
  • https://groups.io/sitemap-index24.xml
  • https://groups.io/sitemap-index25.xml
  • https://groups.io/sitemap-index26.xml
  • https://groups.io/sitemap-index27.xml
  • https://groups.io/sitemap-index28.xml
  • https://groups.io/sitemap-index29.xml
  • https://groups.io/sitemap-index30.xml
  • https://groups.io/sitemap-index31.xml
  • https://groups.io/sitemap-index32.xml
  • https://groups.io/sitemap-index33.xml
  • https://groups.io/sitemap-index34.xml
  • https://groups.io/sitemap-index35.xml
  • https://groups.io/sitemap-index36.xml
  • https://groups.io/sitemap-index37.xml
  • https://groups.io/sitemap-index38.xml
  • https://groups.io/sitemap-index39.xml
  • https://groups.io/sitemap-index40.xml
  • https://groups.io/sitemap-index41.xml
  • https://groups.io/sitemap-index42.xml
  • https://groups.io/sitemap-index43.xml
  • https://groups.io/sitemap-index44.xml
  • https://groups.io/sitemap-index45.xml
  • https://groups.io/sitemap-index46.xml
  • https://groups.io/sitemap-index47.xml
  • https://groups.io/sitemap-index48.xml
  • https://groups.io/sitemap-index49.xml
  • https://groups.io/sitemap-index50.xml
  • https://groups.io/sitemap-index51.xml
  • https://groups.io/sitemap-index52.xml
  • https://groups.io/sitemap-index53.xml
  • https://groups.io/sitemap-index54.xml
  • https://groups.io/sitemap-index55.xml
  • https://groups.io/sitemap-index56.xml
  • https://groups.io/sitemap-index57.xml
  • https://groups.io/sitemap-index58.xml

Technology detected

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

  • Cloudflarecdn

    Server: cloudflare

Related domains

Similar connectivity

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