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Domain report

openbook.org.tw

openbook.org.tw ranks in the top 0.35% of domains by connectivity (Common Crawl, cc-main-2026-jul-aug-sep), with 3 distinct hosts observed under it.

Explore openbook.org.tw in the Web Graph

Connectivity

#468,016harmonic-centrality rank
Top percentile
0.35%
Hosts observed
3

From the Common Crawl cc-main-2026-jul-aug-sep hyperlink graph, 133,241,980 domains total. What this rank means

HTTPS reachability

526HTTP status

https://openbook.org.tw/ answered with HTTP 526.

Certificate until 2026-12-19C=US, O=Let's Encrypt, CN=YR2

DNS records

A
  • 139.162.127.191
AAAA
No records found.
MX
  • 10 ALT3.ASPMX.L.GOOGLE.COM.
  • 10 ALT4.ASPMX.L.GOOGLE.COM.
  • 5 ALT1.ASPMX.L.GOOGLE.COM.
  • 5 ALT2.ASPMX.L.GOOGLE.COM.
  • 1 ASPMX.L.GOOGLE.COM.
NS
  • ns2.linode.com.
  • ns1.linode.com.
  • ns4.linode.com.
  • ns3.linode.com.
  • ns5.linode.com.
AS
Server in network Akamai Connected Cloud, AS63949 · Singapore139.162.127.0/24, which holds 139.162.127.191

Live preview

Screenshot of openbook.org.tw

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

Since openbook.org.tw 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)

Registrar
PCHOME
Registered
2016-12-02
Expires
2028-12-01
Last changed
2026-05-07

Nameservers: ns5.linode.com, ns4.linode.com, ns3.linode.com, ns2.linode.com, ns1.linode.com

Status: client transfer prohibited

How to read WHOIS and RDAP data

SSL certificate

Common name
www.openbook.org.tw
Issuer
C=US, O=Let's Encrypt, CN=YR2
Valid from
2026-09-20
Valid until
2026-12-19

Found via Certificate Transparency logs, but does not name openbook.org.tw exactly — likely a wildcard or a related subdomain's certificate. Source: Certificate Transparency logs (crt.sh).

How to check when a certificate expires

HTTP & security headers

Response

Server
cloudflare
Content-Type
text/plain; charset=UTF-8
Cache-Control
private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Content-Encoding
Not sent

Security

Content-Security-Policy
Not sent
Strict-Transport-Security
Not sent
X-Frame-Options
SAMEORIGIN
X-Content-Type-Options
Not sent
Referrer-Policy
same-origin
Permissions-Policy
Not sent

What each security header does

Redirect chain

  1. 1.http://openbook.org.tw/HTTP 301

    → http://www.openbook.org.tw/

  2. 2.http://www.openbook.org.tw/HTTP 301

    → https://www.openbook.org.tw/

  3. 3.https://www.openbook.org.tw/HTTP 200

Meta tags

Title
Not set
Description
Not set
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

robots.txt request failed (HTTP 526).

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.