indexo.dev

fffmath.com

.com crawl

First seen 2026-04-15 · Last seen 2026-05-10 · ok HTTP/1.1 200 3122 ms crawled 2026-05-10

US · 216.198.79.1 · AS16509 Amazon.com, Inc.

Reputation 100/100

Classifying

HTML metadata

Title
Yansong Feng
Language
zh-CN

Technology

CDN
Vercel
Fonts
  • Google Fonts

Third-party hosts loaded (2)

  • fonts.googleapis.com×2
  • fonts.gstatic.com×1

Social

Registration

Registrar
Alibaba Cloud Computing Ltd. d/b/a HiChina (www.net.cn)
Created
2023-07-27
Expires
2028-07-27 800 days left
Updated
2025-06-27
Name servers
  • dns27.hichina.com
  • dns28.hichina.com

DNS records live

NS
  • dns27.hichina.com
  • dns28.hichina.com

Email authentication no MX

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

Certificate (current)

R13
from 2026-04-23 to 2026-07-22
Expires in 64 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 50/100 Checked live page: https://www.fffmath.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=63072000

Links to (6)

Linked from (1)