21ic.com

.com crawl

First seen 2026-04-11 · Last seen 2026-05-18 · ok HTTP/1.1 200 4271 ms crawled 2026-05-07

CN · 47.94.22.105 · AS37963 Hangzhou Alibaba Advertising Co.,Ltd.

Reputation 87/100 weak security headers no dmarc policy

Classifying

HTML metadata

Title: 21IC电子网 - 电子工程师的优选网站
Description: 21IC电子网，电子工程师的优选网站(嵌入式,单片机,DSP,EDA,测试测量,元器件,医疗电子,智能电网)
Language: zh-cmn-Hans

Technology

Server: nginx

Analytics

Google Tag Manager

Third-party hosts loaded (1)

www.googletagmanager.com×1

Contact

Email

macysun@21ic.com

Phone

11010802024343

Registration

Registrar

Alibaba Cloud Computing (Beijing) Co., Ltd.

Created

2000-01-10

Expires

2027-01-10 235 days left

Updated

2025-11-14

Name servers

dns1.hichina.com
dns2.hichina.com

DNS records live

NS

dns1.hichina.com
dns2.hichina.com

MX

10 mx2.qiye.aliyun.com
15 mx3.qiye.aliyun.com
5 mx1.qiye.aliyun.com

Email authentication partial

SPF: v=spf1 include:spf.qiye.aliyun.com -all
strict (-all)
DMARC: not published
DKIM: no key found at common selectors

Certificate (current)

Encryption Everywhere DV TLS CA - G2

from 2026-02-04 to 2027-03-06

Expires in 290 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 30/100 Checked live page: https://www.21ic.com/

findings

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