fchk.cz

Last scanned 15h ago; the signed record is unchanged since 20d ago. Every field below carries an Ed25519 signature from that last reading. Catalog observation, re-checked on rotation - watch it for 5-minute checks.

Up right now
Runs onSuperNetwork
Email byMicrosoft 365
Secured byLet's Encrypt
DNSSEC on · 1 subdomain · tranco
Every line above is a signed observation. Check the math at the bottom of the page.
DRIFT

Steady. No change on record for fchk.cz in the last day; this reading matches the one before it. The steady record is signed like every other reading. Watch it to catch the next move the moment it lands.

SIGNED-OUT VIEW Provider names, posture and counts are shown. The record values - every DNS answer, each subdomain hostname, raw TXT, IPs, cert names and WHOIS - are the product. Sign in for the full signed record, or use the API with a key.

DNS records 8

A1NS3MX1TXT2SOA1

TLS certificates 3

Issued byLet's Encrypt
ExpiresTue, 15 Se (15d)
Certificate nameswithheld

Subdomains 1

1 subdomain hostname observed and signed - the list itself is part of the paid record.

WILDCARD DNSobserved 2026-08-30 04:50 UTC

DomainDrift asked this domain for one hostname that nobody ever registered, and it answered. A domain that answers invented hostnames is running wildcard DNS. It is common and usually deliberate. A SaaS platform gives every customer a subdomain this way. How the check works

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 receipt
Ed25519 receiptthe raw cryptographic proof
Receipt ID
rcpt_5e1adad2abec5b89
Output Hash
b45e6e3dae89d0e35944f38f4bda50d8c45b54d7f4145ab32b7e2c5aa6b48a61
Signature
ed25519:3d58f4dd7ba628b5f4ff4bc76e6e2752cbbaa13fbd9a192ea1690c025b3b49d2fdade0028e75dfa5423d501bb3b0966ecd214e67b78f97501ba5f0e61948780b
Public Key
ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9
Parent
(genesis)
Plane
fast
CONTINUOUS INTERNET TELEMETRY24H DRIFT28,614 material changesacross 23,188 domains · 24h to ~80m agoROTATION58 domains moved DNS from magpiedns.com to koaladns.com, 54 moved backa rotation loop, not a migration · 24hREGISTRAR DRIFT3 changed registrar24hNOW555 curated domains not reachablelast probe, steadySITE ERRORS18,213 sites serving errorslast probe · 5xx / 404 / TLSBOT DEFENSEbot defense observed on 80,855 sites429 rate-limit / 403 bot-block, a posture signal