21ketang.com

.com crawl

First seen 2026-05-20 · Last seen 2026-05-30 · ok HTTP/1.1 200 4876 ms crawled 2026-05-27

US · 104.21.11.232 · AS13335 Cloudflare, Inc.

Reputation 95/100 weak security headers

sector education type homepage

HTML metadata

Title: 上海文都21课堂-上海文都教育科技有限公司
Description: 上海文都教育科技有限公司企业网站门户
Language: en

Technology

CDN: Cloudflare

Third-party hosts loaded (1)

n.sinaimg.cn×3

Registration

Registrar

Gname.com Pte. Ltd.

Created

2017-11-12

Expires

2026-11-12 164 days left

Updated

2026-05-10

Name servers

carla.ns.cloudflare.com
matias.ns.cloudflare.com

DNS records live

NS

carla.ns.cloudflare.com
matias.ns.cloudflare.com

Email authentication no MX

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

Certificate (current)

E8

from 2026-05-10 to 2026-08-08

Expires in 68 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 35/100 Checked over plain HTTP: http://www.21ketang.com/

findings

checked over plain HTTP
missing Content Security Policy
missing frame protection
missing content type protection
missing Referrer Policy
missing Permissions Policy

Links to (30)

Linked from (11)