cas.cz

Observed Jul 22, 2026, 00:18 UTC (1h ago). Every field below was attested with an Ed25519 signature at scan time.

Up right now

Runs onCESNET z.s.p.o

Email byMicrosoft 365

Secured byHellenic Academic and Research Institutions CA

Also usesGoogle Search Console

1 subdomain · tranco_20k

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

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

cas.cz

A / AAAA

147.231.163.240

CESNET z.s.p.oserves the site

nsa.ces.netvisla.utia.cas.czacademy.cas.cz

ces.net + cas.czanswers its DNS

cas-cz.mail.protection.outlook.com

Microsoft 365receives its email

TLS

avcr.cz

Hellenic Academic and Research Institutions CAissued its certificate

DNS Records

A 1

147.231.163.240

MX 1

10cas-cz.mail.protection.outlook.com

TXT 5

MS=ms15273704
PS-1DE9E9D695DD8C6BCB650BF86B69107D861F5A07
google-site-verification=vUDwTSfcIbP-SZlB4YtOHK9HptYiG6lYnU2bDgAbgqs
v=spf1 ip4:147.231.58.32 ip4:147.231.163.131 include:spf.protection.outlook.com ~all
eZQUjdgG4Qz1lrWWUR2cbrxQzAfv6E8v5ZR6ERf7euQqDDSdKQQQ0MMjQLs5ERt6cGUN8tGMy8fMmLeoh4z5Ig==

NS 3

nsa.ces.net
visla.utia.cas.cz
academy.cas.cz

SOA 1

visla.utia.cas.cz root.utia.cas.cz

TLS Certificates (3)

Common Name	Issuer	Expires
`avcr.cz`	C=GR, O=Hellenic Academic and Research Institutions CA, CN=GEANT TLS ECC 1	Tue, 02 Feb 2027 04:51:28 +0000
`GEANT TLS ECC 1`	C=GR, O=Hellenic Academic and Research Institutions CA, CN=HARICA TLS ECC Root CA 2021	Sat, 31 Dec 2039 11:14:20 +0000
`HARICA TLS ECC Root CA 2021`	C=GR, L=Athens, O=Hellenic Academic and Research Institutions Cert. Authority, CN=Hellenic Academic and Research Institutions ECC RootCA 2015	Fri, 31 Aug 2029 07:44:36 +0000

Subdomains (1)

www.cas.cz

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 cas.cz. It updates itself. It attests a signed observation - not that the site is safe.

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

Ed25519 Receipt

Receipt ID: rcpt_c6fd942681f052ee
Output Hash: 1e2e8ad97d6db350e9afe781787e8b0ec4711dfb8ad888e790fc9cdd3e21e5d0
Signature: ed25519:4b6119aa4b2bc508484de539c6bc448890293c650e3be9941ad9e00b0c4394215f32d9b25b1db872ce78d19d1f7ee75bc0a4970303f74a4f335e7113e4e60309
Public Key: ed25519:178c3bd0f57d9d64b83cc4630753381e1a465005a2bbba3d032371f24af0bfd8
Parent: (genesis)
Plane: fast

Verify this in your browser

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