cdu.de

Observed Jul 24, 2026, 01:57 UTC (12h 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

Email byBrevo (Sendinblue)

Secured byLet's Encrypt

Also usesGoogle Search Console

1 subdomain · tranco_100k

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

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

cdu.de

A / AAAA

193.219.105.10

unattributedserves the site

ns1.cdu.dens2.arcor-ip.dens1.arcor-ip.dens3.arcor-ip.de

cdu.de + arcor-ip.deanswers its DNS

mail48.cdu.de

Brevo (Sendinblue)receives its email

TLS

cdu.de

Let's Encryptissued its certificate

DNS Records

A 1

193.219.105.10

MX 1

5mail48.cdu.de

TXT 12

google-site-verification=GyUpyOQVmh5n3HahHS97DHNVkwwfaagmy9WKenpTEg8
google-site-verification=5VKRrUmBgFVF-szaRCFv4S0c4pajeEcqTBqvVSkNjlk
Sendinblue-code:aa2789879467a12bc6861a37ecf4889f
NEcqxLZkjZv1JyFpDjTNF/wvWupIQoimBc6Gc+5SbtwxiXS/DOATFriP+92cb9SB4t9ZwSRS7aaXbPLqZzFnlg==
v=spf1 ip4:193.219.105.0/24 ip4:87.129.40.18 ip4:87.129.40.20 ip4:87.129.40.21 ip4:87.129.40.22 include:spf.protection.outlook.com include:inxserver.com include:spf.mailjet.com include:spf.sendinblue.com mx -all
google-site-verification=HxwmL2DD8zzNOeUQ4xOvXuYGwDJ6xM0Ws9eckrztXVw
cisco-ci-domain-verification=10a6638c06922ff7bf5c73c9899e3e6517bce78ae01ebb8f7892f319ab8c07d6
apple-domain-verification=3SPyxSh5Gir4W3lC
MS=ms73549048
MS=ms80140043

NS 4

ns1.cdu.de
ns2.arcor-ip.de
ns1.arcor-ip.de
ns3.arcor-ip.de

SOA 1

ns1.cdu.de root.ns1.cdu.de

TLS Certificates (4)

Common Name	Issuer	Expires
`cdu.de`	C=US, O=Let's Encrypt, CN=YE2	Wed, 07 Oct 2026 19:25:29 +0000
`YE2`	C=US, O=ISRG, CN=Root YE	Sat, 02 Sep 2028 23:59:59 +0000
`Root YE`	C=US, O=Internet Security Research Group, CN=ISRG Root X2	Thu, 02 Sep 2032 23:59:59 +0000
`ISRG Root X2`	C=US, O=Internet Security Research Group, CN=ISRG Root X1	Thu, 02 Sep 2032 23:59:59 +0000

Subdomains (1)

www.cdu.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 cdu.de. It updates itself. It attests a signed observation - not that the site is safe.

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

Ed25519 Receipt

Receipt ID: rcpt_254958689208a8ed
Output Hash: 5625745dcf303ba659d97a72075495ac91d93cd2fced4b8d013ec96af896e7f8
Signature: ed25519:83f03e80a8280874879b254d1c3226f1cd0bf38f0332894cd0c994523b7e886de50d7b7ba794a149df35fe146a9834e99bf4dd82d554d9e8e8c95ea3d9d69f0c
Public Key: ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9
Parent: (genesis)
Plane: fast

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