jtbopen.cz
Observed Aug 16, 2026, 07:42 UTC (4h 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.
Let's EncryptDomainDrift asked this domain for a TXT record at a name nobody registers, and got an answer back. A domain that answers a name that was never created is answering names in general, and that is wildcard DNS.
Wildcard DNS clusters around domain parking, dynamic DNS and catch-all hosting. It is also a real attack surface: if every invented hostname resolves, then a hostname an attacker invents resolves too, which is the ground state for subdomain takeover and for phishing hosted under a name that looks legitimate.
This is evidence of wildcard behaviour, not a proven fact. It rests on one control name: a domain could legitimately serve a TXT record at exactly that name for an unrelated reason, and a wildcard that answers address records but not TXT records would not be caught here at all. What this reading is and is not.
DNS Records
A 1
95.168.212.14
AAAA 1
2a01:28:ca:112::1:1884
MX 1
10dvi08.vas-server.cz
TXT 1
v=spf1 a mx ?all
NS 3
ns.vas-hosting.czns.vas-hosting.euns.vas-hosting.com
SOA 1
ns.vas-hosting.cz info.vas-hosting.cz
MCP_RECORDS 1
v=spf1 a mx ?all
DMARC_RECORDS 1
v=spf1 a mx ?all
BIMI_RECORDS 1
v=spf1 a mx ?all
MTA_STS_RECORDS 1
v=spf1 a mx ?all
TLS Certificates (4)
| Common Name | Issuer | Expires |
|---|---|---|
jtbopen.cz |
C=US, O=Let's Encrypt, CN=YE2 | Sun, 11 Oct 2026 20:12:25 +0000 |
YE2 |
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 (0)
None observed.
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 receiptEd25519 Receipt
- Receipt ID
rcpt_9b7bf71be5bd5c46- Output Hash
13fbd3cb25f54829d4edb8fcf65239f8386cb4f4c09d49f54a4c6839924c757b- Signature
ed25519:a2b038cb8b656e207d19359c2bd089074007547a75f326eb36b180932b6d302334f2ab5b72419b3585c021103f0b287e990b076825bc13c769abd8319939600e- Public Key
ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9- Parent
(genesis)- Plane
- fast