indexo.dev

a4a.de

.de crawl dns

First seen 2026-04-15 · Last seen 2026-05-19 · ok HTTP/1.1 200 1852 ms crawled 2026-05-10

DE · 88.99.107.170 · AS24940 Hetzner Online GmbH

Reputation 92/100 no dmarc policy

Classifying

HTML metadata

Title
a4a | Serving people.
Description
a4a ist ein aufstrebender Internetdienstleister. Portfolioschwerpunkte sind Webhosting, E-Mailing, virtuelle Server und Backupdienstleistungen.

Technology

Server
Apache

Registration

Updated
2025-12-15
Name servers
  • ns1.desec.io.
  • ns2.desec.org.

DNS records live

NS
  • ns1.desec.io
  • ns2.desec.org
MX
  • 10 mail.a4a.de

Email authentication weak

SPF
v=spf1 mx -all
strict (-all)
DMARC
not published
DKIM
no key found at common selectors

Certificate (current)

R13
from 2026-03-28 to 2026-06-26
Expires in 37 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 50/100 Checked live page: https://a4a.de/start/

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=31536000

Linked from (1)