arc42.de

Observed Jul 27, 2026, 23:48 UTC (20h ago). Every field below was attested with an Ed25519 signature at scan time. Catalog observation, re-checked on rotation — watch it for 5-minute checks.

Verify this receipt yourself + Watch this domain

Up right now

Secured byLet's Encrypt

Also usesGoogle Search Console

1 subdomain · domcop

Every line above is a signed observation. Check the math at the bottom of the page.

INFRASTRUCTURE MAPwhat arc42.de actually stands on - every host below is a signed observation

arc42.de

A / AAAA

185.199.108.153185.199.111.153185.199.109.153185.199.110.153

unattributedserves the site

ns1033.ui-dns.comns1033.ui-dns.bizns1033.ui-dns.dens1033.ui-dns.org

ui-dns.com + ui-dns.biz + moreanswers its DNS

mx01.ionos.demx00.ionos.de

ionos.dereceives its email

TLS

arc42.de

Let's Encryptissued its certificate

DNS Records

A 4

185.199.108.153
185.199.111.153
185.199.109.153
185.199.110.153

MX 2

10mx01.ionos.de
10mx00.ionos.de

TXT 3

google-site-verification=cJkGGo3KnDRxH3RaGsX0mJDVdz8uio-JL5X440TAMZc
v=spf1 include:_spf-eu.ionos.com ~all
v=DMARC1; p=none;

NS 4

ns1033.ui-dns.com
ns1033.ui-dns.biz
ns1033.ui-dns.de
ns1033.ui-dns.org

SOA 1

ns1033.ui-dns.org hostmaster.1und1.de

TLS Certificates (3)

Common Name	Issuer	Expires
`arc42.de`	C=US, O=Let's Encrypt, CN=YR2	Sat, 10 Oct 2026 16:25:21 +0000
`YR2`	C=US, O=ISRG, CN=Root YR	Sat, 02 Sep 2028 23:59:59 +0000
`Root YR`	C=US, O=Internet Security Research Group, CN=ISRG Root X1	Thu, 02 Sep 2032 23:59:59 +0000

Subdomains (1)

www.arc42.de

The proof

Signed at scan time. Check the math yourself. Every line above is part of one signed observation. Re-hash it and check the Ed25519 signature in your own browser; nothing leaves your machine.

Verify this receipt

Put the receipt on your own site. A live badge showing what DomainDrift observes and signs for arc42.de. It updates itself. It attests a signed observation - not that the site is safe.

<a href="https://domaindrift.io/t/arc42.de">
  <img src="https://domaindrift.io/badge/arc42.de.svg"
       width="300" height="64" alt="DomainDrift signed observations for arc42.de">
</a>

Ed25519 Receipt

Receipt ID: rcpt_15031fcd00234dbf
Output Hash: 13af61e4b8b3770834755643d16b37be975452b195991c357ea5cc2e5d30ebc3
Signature: ed25519:3038e302dea6cd8593eac573e8c97a0f05901336c93619b3406e584ac3631000082a8354ec81964f999117775fde7fff0fa82274805f87e91ebb38ebcd14c50c
Public Key: ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9
Parent: (genesis)
Plane: fast

Verify this in your browser

Permalink: https://domaindrift.io/t/arc42.de