Domain report
socket.io
socket.io ranks in the top 0.0030% of domains by connectivity (Common Crawl, cc-main-2026-jul-aug-sep), with 8 distinct hosts observed under it.
Connectivity
#3,963harmonic-centrality rank
- Top percentile
- 0.0030%
- Hosts observed
- 8
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://socket.io/ answered with HTTP 200.
DNS records
- A
- 76.76.21.98
- 76.76.21.142
- AAAA
- No records found.
- MX
- No records found.
- NS
- ns2.automattic.com.
- ns3.automattic.com.
- ns4.automattic.com.
- ns1.automattic.com.
Live preview
This is a live, sandboxed embed of socket.io — not a copy. What it shows can change any time the site itself does.
Domain registration (WHOIS / RDAP)
RDAP lookup failed (HTTP 429).
SSL certificate
Certificate Transparency lookup failed (HTTP 429).
HTTP & security headers
Response
- Server
- cloudflare
- Content-Type
- text/html; charset=utf-8
- Cache-Control
- public, max-age=0, must-revalidate
- Content-Encoding
- Not sent
Security
- Content-Security-Policy
- Not sent
- Strict-Transport-Security
- max-age=63072000
- X-Frame-Options
- Not sent
- X-Content-Type-Options
- Not sent
- Referrer-Policy
- Not sent
- Permissions-Policy
- Not sent
Redirect chain
- 1.
http://socket.io/HTTP 308→ https://socket.io/
- 2.
https://socket.io/HTTP 200
Meta tags
- Title
- Socket.IO
- Description
- Not set
- Canonical
- https://socket.io/
- Robots
- Not set
- Generator
- Docusaurus v2.4.3
- Open Graph title
- Socket.IO
- Open Graph description
- Not set
- Open Graph image
- Not set
- Open Graph type
- Not set
- Twitter card
- summary_large_image
- Twitter title
- Not set
- Twitter image
- Not set
robots.txt
socket.io has no robots.txt.
Technology detected
Best-effort, based on a small set of well-known signals — this may be incomplete.
- Cloudflarecdn
Server: cloudflare
Related domains
Similar connectivity
Domains ranked just above and below it in the same snapshot.