indexo.dev

21shu.com

.com crawl

First seen 2026-04-23 · Last seen 2026-04-27 · ok HTTP/1.1 200 2954 ms crawled 2026-05-16

US · 23.248.222.46 · AS138415 Yancy Limited

Reputation 100/100

Classifying

HTML metadata

Title
二一书库_书友最值得收藏的网络小说阅读网
Description
二一书库
Language
zh
Canonical
https://www.21shu.com/

Technology

Server
ceracdn

Registration

Registrar
Gname.com Pte. Ltd.
Created
2007-07-21
Expires
2026-07-21 62 days left
Updated
2025-05-27
Name servers
  • a5.share-dns.com
  • b5.share-dns.net

DNS records live

NS
  • a.share-dns.com
  • b.share-dns.net
CNAME
  • 72d73928.ceracdn.net

Email authentication no MX

SPF
not published
DMARC
not published
DKIM
no key found at common selectors

Certificate (current)

R12
from 2026-03-27 to 2026-06-25
Expires in 36 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 50/100 Checked live page: https://21shu.com/

present
  • strict-transport-security
findings
  • missing Content Security Policy
  • missing frame protection
  • missing content type protection
  • missing Referrer Policy
  • missing Permissions Policy
Header values
strict-transport-security
max-age=31536000

Linked from (2)