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cesnet.cz

Observed Jul 27, 2026, 09:47 UTC (6d 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 onCESNET z.s.p.o
Email byMailchimp
Secured byHellenic Academic and Research Institutions CA
Also usesGoogle Search Console
IPv6 · 1 subdomain · tranco_40k
Every line above is a signed observation. Check the math at the bottom of the page.
INFRASTRUCTURE MAPwhat cesnet.cz actually stands on - every host below is a signed observation
cesnet.cz
A / AAAA
78.128.246.932001:718:ff05:108::93
CESNET z.s.p.oserves the site
NS
nsa.ces.netnsa.ten.cznsa.cesnet.czdecsys.vsb.cz
ces.net + ten.cz + moreanswers its DNS
MX
ag2.cesnet.czag1.cesnet.cz
Mailchimpreceives its email
TLS
www.cesnet.cz
Hellenic Academic and Research Institutions CAissued its certificate

DNS Records

A 1

  • 78.128.246.93

AAAA 1

  • 2001:718:ff05:108::93

MX 2

  • 10ag2.cesnet.cz
  • 20ag1.cesnet.cz

TXT 3

  • v=spf1 exists:%{ir}.spf.cesnet.cz include:servers.mcsv.net ~all
  • google-site-verification=_67tfbFvuyNG5y_dNEpIUG7l0cR2p3g0J1znRhtcVhE
  • v=DMARC1; p=quarantine; sp=none; rua=mailto:dmarc-rua@cesnet.cz

NS 4

  • nsa.ces.net
  • nsa.ten.cz
  • nsa.cesnet.cz
  • decsys.vsb.cz

SOA 1

  • nsa.cesnet.cz hostmaster.cesnet.cz

SRV 5

  • cyrus.cesnet.cz:5060 p100
  • cyrus.cesnet.cz:5061 p100
  • cups1.cesnet.cz:5269 p0
  • office2.cesnet.cz:993 p0
  • office2.cesnet.cz:587 p10

CAA 6

  • iodef "mailto:abuse@cesnet.cz"
  • issue "harica.gr"
  • issue "letsencrypt.org"
  • issue "postsignum.cz"
  • issuemail "harica.gr"
  • issuewild "harica.gr"

TLS Certificates (3)

Common NameIssuerExpires
www.cesnet.cz C=GR, O=Hellenic Academic and Research Institutions CA, CN=GEANT TLS RSA 1 Sat, 20 Feb 2027 12:54:55 +0000
GEANT TLS RSA 1 C=GR, O=Hellenic Academic and Research Institutions CA, CN=HARICA TLS RSA Root CA 2021 Sat, 31 Dec 2039 11:14:59 +0000
HARICA TLS RSA Root CA 2021 C=GR, L=Athens, O=Hellenic Academic and Research Institutions Cert. Authority, CN=Hellenic Academic and Research Institutions RootCA 2015 Fri, 31 Aug 2029 07:41:54 +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.

Verify this receipt

Put the receipt on your own site. A live badge showing what DomainDrift observes and signs for cesnet.cz. It updates itself. It attests a signed observation - not that the site is safe.

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

Ed25519 Receipt

Receipt ID
rcpt_c6ca400c11fa3b41
Output Hash
21c3410d535cbb22a96d2efc048fac575cd4c88215ac3bd66aca633f8d0612a6
Signature
ed25519:d303b7ee778af314aa6d2e4f85a8fa60b4abe7f869a9aa830d0e4f404138fee8eb17ec6f448612b88251a53074850a270ca66a72469510d421c9845cb67d970a
Public Key
ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9
Parent
(genesis)
Plane
fast
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