CONTINUOUS INTERNET TELEMETRY24H DRIFT7,874 material changesacross 7,306 domains · 24h to ~65m ago · -889 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

vhu.cz

Observed Aug 2, 2026, 10:47 UTC (21h 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
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 vhu.cz actually stands on - every host below is a signed observation
vhu.cz
A / AAAA
77.78.110.243
unattributedserves the site
NS
ns2.blueboard.czshinzon.blueboard.cz
blueboard.czanswers its DNS
MX
0ea6bc4222c6e636.mx2.emailprofi.seznam.cz0ea6bc4222c6e636.mx1.emailprofi.seznam.cz
seznam.czreceives its email
TLS
www.vhu.cz
Let's Encryptissued its certificate

DNS Records

A 1

  • 77.78.110.243

MX 2

  • 100ea6bc4222c6e636.mx2.emailprofi.seznam.cz
  • 200ea6bc4222c6e636.mx1.emailprofi.seznam.cz

TXT 1

  • v=spf1 a mx include:spf.blueboard.cz include:spf.seznam.cz -all

NS 2

  • ns2.blueboard.cz
  • shinzon.blueboard.cz

SOA 1

  • shinzon.blueboard.cz hostmaster.blueboard.cz

DMARC_RECORDS 1

  • v=DMARC1; p=none; rua=mailto:12dnsnj1t4@dmarc-reports.ecomailapp.com; fo=1; ri=86400;

TLS Certificates (4)

Common NameIssuerExpires
www.vhu.cz C=US, O=Let's Encrypt, CN=YE1 Fri, 23 Oct 2026 02:59:35 +0000
YE1 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_9a7fefca76181f28
Output Hash
09ba63b235b792a3082100e99a1438389f76e9bfa582005de86e4ae24086dace
Signature
ed25519:944a3e8c01151dc4226a4b373fab8c86580c141bcd1c7e355f1e4e063c193eff5d2fdfd6df709a4dc804a81ed6fb15212ea200ecfe1cd238e41f745b42275704
Public Key
ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9
Parent
(genesis)
Plane
fast
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