stadt-koeln.de

Observed Jul 24, 2026, 03:32 UTC (10h 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

Runs onNetCologne Gesellschaft fur Telekommunikation mbH

Secured byLet's Encrypt

IPv6 · 3 subdomains · tranco_40k

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

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

stadt-koeln.de

A / AAAA

87.79.15.1402001:4dd0:100:1f00:80:0:221:1

NetCologne Gesellschaft fur Telekommunikation mbHserves the site

dns4.netcologne.dedns13.netcologne.dedns11.netcologne.dedns12.netcologne.de+3 more

netcologne.deanswers its DNS

mail1.stadt-koeln.demail2.stadt-koeln.de

stadt-koeln.dereceives its email

TLS

www.stadt-koeln.de

Let's Encryptissued its certificate

DNS Records

A 1

87.79.15.140

AAAA 1

2001:4dd0:100:1f00:80:0:221:1

MX 2

10mail1.stadt-koeln.de
10mail2.stadt-koeln.de

TXT 3

v=spf1 mx a:otc-de-spf.mms.t-systems-service.com ip4:91.151.20.22 include:ekom21.de include:successfactors.eu -all
successfactors-site-verification=NTIxYzA0NTQ2NTlkY2U0YzJlMjI4ZDIxY2JkYTNhNTBjM2Q5N2Y3YWE5MDcxOGMxODRhZWVhYjJhNjIzYjg3ZQ==
v=DMARC1;p=quarantine;sp=quarantine;pct=100;rua=mailto:dmarc@stadt-koeln.de

NS 7

dns4.netcologne.de
dns13.netcologne.de
dns11.netcologne.de
dns12.netcologne.de
dns5.netcologne.de
dns14.netcologne.de
dns3.netcologne.de

SOA 1

dns11.netcologne.de hostmaster.routing.net

TLS Certificates (3)

Common Name	Issuer	Expires
`www.stadt-koeln.de`	C=US, O=Let's Encrypt, CN=YR2	Mon, 07 Sep 2026 05:01:58 +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 (3)

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

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

Ed25519 Receipt

Receipt ID: rcpt_a467827a136da738
Output Hash: c7873223ee14e0a94174df1afda26806511592c89df7e856e78a167ecc09984a
Signature: ed25519:888d82f100e38a6f8402d87931832f6ed5bf346fc7c3bb8836e7769c76ab6605c9cf1e7b5fdbec234413a79c59646cdc13250417b5e5214d83819b36a7b44e0f
Public Key: ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9
Parent: (genesis)
Plane: fast

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