bluetone.cz
Observed Aug 16, 2026, 16:57 UTC (2h 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.
Up right now
Email byMicrosoft 365
Microsoft 365Secured byLet's Encrypt
Let's EncryptRegistered withREG-INTERNET-CZ
IPv6 · 1 subdomain · tranco_100k
Every line above is a signed observation. Check the math at the bottom of the page.
INFRASTRUCTURE MAPwhat bluetone.cz actually stands on - every host below is a signed observation
bluetone.cz
A / AAAA
84.244.77.1982a02:a40:2:1::54f4:4dd92a02:a40:2:1::54f4:4dc6
2a02serves the site
NS
ns.bluetone.czns1.bluetone.czns2.bluetone.cz
bluetone.czanswers its DNS
MX
bluetone-cz.mail.protection.outlook.com
Microsoft 365receives its email
TLS
bluetone.cz
Let's Encryptissued its certificate
DNS Records
A 1
84.244.77.198
AAAA 2
2a02:a40:2:1::54f4:4dd92a02:a40:2:1::54f4:4dc6
MX 1
10bluetone-cz.mail.protection.outlook.com
TXT 2
MS=ms49405193v=spf1 include:smtp.cra.cz include:spf.protection.outlook.com -all
NS 3
ns.bluetone.czns1.bluetone.czns2.bluetone.cz
SOA 1
ns.bluetone.cz root.bluetone.cz
DMARC_RECORDS 1
v=DMARC1; p=quarantine; sp=none; rua=mailto:mailValidity@cra.cz; ruf=mailto:mailValidity@cra.cz; fo=1;
TLS Certificates (4)
| Common Name | Issuer | Expires |
|---|---|---|
bluetone.cz |
C=US, O=Let's Encrypt, CN=YE1 | Tue, 06 Oct 2026 11:23:17 +0000 |
YE1 |
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 (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; the only network request the check makes is for the published public keys.
Verify this receiptEd25519 Receipt
- Receipt ID
rcpt_8fcb36ab00249cd9- Output Hash
39668ed76794feb00cbdebcaf56cd538428864735213c9af9fca4e60f47c7d5d- Signature
ed25519:82eedfc1ab1f26ef8dfd40b8a00a67d16b74e6bdb2dc09c6c251237e42e6a6e6b945f4c066a01974eb65fabcbdb7918c5537a84d4cb2d35114e8c38c80839b0b- Public Key
ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9- Parent
(genesis)- Plane
- fast