CONTINUOUS INTERNET TELEMETRY24H DRIFT4,871 material changesacross 4,498 domains · 24h to ~80m ago · -3,892 vs yesterdayNOW560 curated domains not reachablelast probe, steadySITE ERRORS34,304 sites serving errorslast probe · 5xx / 404 / TLSBOT DEFENSEbot defense observed on 156,289 sites429 rate-limit / 403 bot-block, a posture signalMOVERokta.comNo mail routes in the latest observation

zu.de

Observed Aug 2, 2026, 11:48 UTC (17h 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.

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Up right now
Email bySalesforce
Secured byLet's Encrypt
1 subdomain · tranco
Every line above is a signed observation. Check the math at the bottom of the page.
INFRASTRUCTURE MAPwhat zu.de actually stands on - every host below is a signed observation
zu.de
A / AAAA
85.13.136.128
unattributedserves the site
NS
cns3.alfahosting.infocns1.alfahosting.infocns2.alfahosting.info
alfahosting.infoanswers its DNS
MX
d334026.a.ess.de.barracudanetworks.comd334026.b.ess.de.barracudanetworks.com
Salesforcereceives its email
TLS
zu.de
Let's Encryptissued its certificate

DNS Records

A 1

  • 85.13.136.128

MX 2

  • 0d334026.a.ess.de.barracudanetworks.com
  • 0d334026.b.ess.de.barracudanetworks.com

TXT 3

  • g6Kq3Gqocv6hwLiszklHL1EsDT+U0yBEhEs+f1/zQ6Iw7gcm12ImDnDKsI7dgzZGyGvz3Tt7lVmxcEqO1NBmFw==
  • v=spf1 ip4:193.175.6.55 include:spf.protection.outlook.com include:spf.ess.de.barracudanetworks.com include:mail.zendesk.com include:_spf.createsend.com a:vereinonline.org include:_spf.salesforce.com include:_spf.tivian.com include:_spf.uni-freiburg.de -all
  • jYw4p8NNjywh8Fgb5G3R8++Tuyp8+iuZYrslQ/ry9A3ofzCoM+02v2T7gXA4n4zJPYH5jWgwXx3FJ7SY6Nl++A==

NS 3

  • cns3.alfahosting.info
  • cns1.alfahosting.info
  • cns2.alfahosting.info

SOA 1

  • cns1.alfahosting.info hostmaster.alfahosting.de

DMARC_RECORDS 1

  • v=DMARC1; p=quarantine; fo=1; rua=mailto:dmarc@zu.de,mailto:rua+zu.de@dmarc.barracudanetworks.com; ruf=mailto:dmarc@zu.de,mailto:ruf+zu.de@dmarc.barracudanetworks.com

TLS Certificates (4)

Common NameIssuerExpires
zu.de C=US, O=Let's Encrypt, CN=YE2 Sat, 05 Sep 2026 11:40:12 +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)

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.

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Ed25519 Receipt

Receipt ID
rcpt_f6e86c7144b39e82
Output Hash
49cc9bbe03f81df4e3f209b2dc08b5fa30de4531726e03dc5f8e94827c31d877
Signature
ed25519:7fdd82ed3bd1bb734fce7bb9d028091df08601ae243590d933efc1763584bb8b61d7594e1690e3ae60af1505dce1b3216f5f732fecfb6c15348199d5211a9106
Public Key
ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9
Parent
(genesis)
Plane
fast
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