jcu.cz

Observed Aug 10, 2026, 19:15 UTC (5d ago). Every field below was attested with an Ed25519 signature at scan time.

This reading of jcu.cz was taken 5d ago

jcu.cz is on the survey sweep, which works its way across the whole catalog rather than returning to one name on a schedule. Putting jcu.cz under watch moves it to the fast lane, where DomainDrift re-checks it about every 5 minutes and signs each reading, so a change becomes a dated event within minutes instead of waiting for the sweep to come round.

Watch jcu.cz Watching a domain needs a DRM3 account. The reading above stays free and public either way.

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Up right now

Email byMicrosoft 365

Secured byLet's Encrypt

Also usesAppleFacebook/MetaGoogle Search Console

2 subdomains · tranco_100k

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

INFRASTRUCTURE MAPwhat jcu.cz actually stands on - every host below is a signed observation

jcu.cz

A / AAAA

160.217.6.39

unattributedserves the site

hera.zcu.czorion.zf.jcu.czgemini.jcu.cz

zcu.cz + jcu.czanswers its DNS

jcu-cz.mail.protection.outlook.com

Microsoft 365receives its email

TLS

jcu.cz

Let's Encryptissued its certificate

DNS Records

A 1

160.217.6.39

MX 1

100jcu-cz.mail.protection.outlook.com

TXT 4

apple-domain-verification=93nIvXBPAF4Wb1Iq
facebook-domain-verification=pio9amtqdqz8pvlbdn93pxhbcon1vt
google-site-verification=sdC0gdhFZ7CoL3-CZJ2Fjjv7vVSh7R57zJ1AFee6_CQ
v=spf1 ip4:160.217.1.0/24 ip4:160.217.6.33 ip4:160.217.6.151 include:spf.protection.outlook.com ~all

NS 3

hera.zcu.cz
orion.zf.jcu.cz
gemini.jcu.cz

SOA 1

virgo.jcu.cz hostmaster.jcu.cz

SRV 1

asta.tel.jcu.cz:5060 p0

DMARC_RECORDS 1

v=DMARC1; p=quarantine; sp=quarantine; pct=100; rua=mailto:dmar@jcu.cz; ruf=mailto:dmfr@jcu.cz; adkim=s; aspf=s; fo=1:d:s

TLS Certificates (3)

Common Name	Issuer	Expires
`jcu.cz`	C=US, O=Let's Encrypt, CN=YR1	Mon, 21 Sep 2026 04:53:08 +0000
`YR1`	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 (2)

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; the only network request the check makes is for the published public keys.

Verify this receipt

Ed25519 Receipt

Receipt ID: rcpt_b029a06dc8c98a51
Output Hash: 6e0f1c27d96f91bcef35446989a5508bcdba9715f155f186c3d6a4ec515cfbb6
Signature: ed25519:d35135f978e6ffcae3982a93bcb23a96325b20c7afd3859fb21c64687c5ddfaf9ac982841a5bf2344a9ca44d85bfcbffa87352b048e9925cff245155ff90e804
Public Key: ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9
Parent: (genesis)
Plane: fast

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