indexo.dev

headlessui.com

.com crawl

First seen 2026-04-11 · Last seen 2026-05-18 · ok HTTP/1.1 200 462 ms crawled 2026-05-18

US · 104.21.49.12 · AS13335 Cloudflare, Inc.

Reputation 92/100 no dmarc policy

Classifying

HTML metadata

Title
Headless UI - Unstyled, fully accessible UI components
Language
en

Open Graph

url
https://headlessui.com/
title
Headless UI
description
Completely unstyled, fully accessible UI components, designed to integrate beautifully with Tailwind CSS.

Technology

CDN
Cloudflare
CMS
Next.js

Third-party hosts loaded (1)

  • rsms.me×1

Social

Registration

Registrar
Tucows Domains Inc.
Created
2020-06-08
Expires
2026-06-08 19 days left
Updated
2025-06-07
Name servers
  • anuj.ns.cloudflare.com
  • roxy.ns.cloudflare.com

DNS records live

NS
  • anuj.ns.cloudflare.com
  • roxy.ns.cloudflare.com
MX
  • 1 aspmx.l.google.com
  • 10 alt3.aspmx.l.google.com
  • 10 alt4.aspmx.l.google.com
  • 5 alt1.aspmx.l.google.com
  • 5 alt2.aspmx.l.google.com

Email authentication weak

SPF
v=spf1 include:_spf.google.com ~all
softfail (~all)
DMARC
not published
DKIM
  • google: v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAgJBBt+xFn9VhQ/TcnYF1Fla5fuKLdyDLpAZj1g7FuCrdyv/5SxL2Ye6kw2gSgZB4z1Vy9mCpGpRs+8…
selectors probed

Certificate (current)

WE1
from 2026-04-25 to 2026-07-24
Expires in 66 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 50/100 Checked live page: https://headlessui.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 (1)

Linked from (4)