vfu.cz
Observed Aug 3, 2026, 01:36 UTC (9h 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.
Not responding
Secured byLet's Encrypt
Also usesGoogle Search Console
1 subdomain · tranco
Every line above is a signed observation. Check the math at the bottom of the page.
INFRASTRUCTURE MAPwhat vfu.cz actually stands on - every host below is a signed observation
vfu.cz
A / AAAA
195.113.198.43
unattributedserves the site
NS
ns.muni.czns1.vetuni.cz
muni.cz + vetuni.czanswers its DNS
MX
ag1.cesnet.czag2.cesnet.cz
cesnet.czreceives its email
TLS
vfu.cz
Let's Encryptissued its certificate
DNS Records
A 1
195.113.198.43
MX 2
1ag1.cesnet.cz1ag2.cesnet.cz
TXT 3
google-site-verification=miyd3SOaQ9HBeQkKsnfwKvLmzqtV4-OlOcIrNghIsLsxziceQbIhF6CnfeURUu91VytNd4amJrIQrrBdiliUD+WunyjZQ53q/MyI/1uJonDMPRoWoPmHZgfXFpG7moCog==v=spf1 a:mail.vfu.cz include:spf.protection.outlook.com ip4:195.113.198.0/24 include:web.spf.e-fractal.cz ip6:2603:10a6:150:1::20 ~all
NS 2
ns.muni.czns1.vetuni.cz
SOA 1
ns1.vetuni.cz jdvor.vfu.cz
SRV 1
ex1mail.vfu.cz:443 p0
DMARC_RECORDS 1
v=DMARC1; p=quarantine;sp=none; ruf=mailto:postmaster@vfu.cz; rua=mailto:postmaster@vfu.cz; aspf=r; adkim=r;
MTA_STS_RECORDS 1
v=STSv1; id=20240208131300
TLS Certificates (3)
| Common Name | Issuer | Expires |
|---|---|---|
vfu.cz |
C=US, O=Let's Encrypt, CN=YR2 | Wed, 28 Oct 2026 18:16:51 +0000 |
YR2 |
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 (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 receiptEd25519 Receipt
- Receipt ID
rcpt_3dcd1d462c16f46b- Output Hash
1dcc92ac7b7d497c4a2d32c2be90a81b0d3389a0ad5eca740ca82912630431a9- Signature
ed25519:adbf4b4bfd02ac92d3fd6f21c10a834ef660b8a97ea3640ad35fae5f76df93f5e7425d63abe0c8fa47b937cbcaf65370d2115f8660c2077e64423ddd134ff301- Public Key
ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9- Parent
(genesis)- Plane
- fast