51jiaoxi.com

.com crawl

First seen 2026-04-11 · Last seen 2026-05-19 · ok HTTP/1.1 200 1803 ms crawled 2026-05-07

CN · 180.163.146.13 · AS4811 China Telecom Group

Reputation 95/100 weak security headers

Classifying

HTML metadata

Title: 教习网-PPT课件,教案,试题试卷-精选教学资源下载网
Description: 教习网精选小学、初中、高中、中职语文、数学、英语、道德与法治、科学、物理、化学、生物、历史、地理、政治等学科课堂教学所需的PPT课件、教案教学设计、试题试卷等资源下载，涵盖部编版、人教版、北师大版等主流版本，助老师们轻松备课！
Language: zh-cn

Open Graph

title: 教习网-PPT课件,教案,试题试卷-精选教学资源下载网

Technology

CDN: Cloudflare

Registration

Registrar

Alibaba Cloud Computing (Beijing) Co., Ltd.

Created

2018-05-08

Expires

2027-05-08 352 days left

Updated

2026-04-09

Name servers

vip3.alidns.com
vip4.alidns.com

DNS records live

NS

vip3.alidns.com
vip4.alidns.com

MX

10 mxbiz2.qq.com
5 mxbiz1.qq.com

CNAME

www.51jiaoxi.com.w.kunluncan.com

Verified for

GlobalSign
Google

Email authentication no MX

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

Certificate (current)

GlobalSign GCC R6 AlphaSSL CA 2023

from 2024-12-24 to 2026-01-25

Expired 115 days ago

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 30/100 Checked live page: https://www.51jiaoxi.com/

findings

missing HSTS
missing Content Security Policy
missing frame protection
missing content type protection
missing Referrer Policy
missing Permissions Policy