duplex.cz

Observed Jul 29, 2026, 07:18 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.

Verify this receipt yourself + Watch this domain

Up right now

Runs onCloudflare

Email byGoogle Workspace

Secured byGoogle Trust Services

Also usesGoogle Search Console

IPv6 · majestic

Every line above is a signed observation. Check the math at the bottom of the page.

INFRASTRUCTURE MAPwhat duplex.cz actually stands on - every host below is a signed observation

duplex.cz

A / AAAA

104.21.16.3172.67.165.1602606:4700:3032::6815:10032606:4700:3033::ac43:a5a0

Cloudflareserves the site

kami.ns.cloudflare.comlogan.ns.cloudflare.com

cloudflare.comanswers its DNS

aspmx.l.google.comalt3.aspmx.l.google.comalt4.aspmx.l.google.comalt1.aspmx.l.google.com+1 more

Google Workspacereceives its email

TLS

duplex.cz

Google Trust Servicesissued its certificate

DNS Records

A 2

104.21.16.3
172.67.165.160

AAAA 2

2606:4700:3032::6815:1003
2606:4700:3033::ac43:a5a0

MX 5

1aspmx.l.google.com
10alt3.aspmx.l.google.com
10alt4.aspmx.l.google.com
5alt1.aspmx.l.google.com
5alt2.aspmx.l.google.com

TXT 3

google-site-verification=55wJSrwxRWk5YpzTQMHxwyYA8ltuEY1lXKdpxGaVFgY
v=spf1 ip4:152.89.92.24 ip4:164.92.164.30 include:servers.mcsv.net include:_spf.google.com include:_spf.smtp.com include:_spf.elasticemail.com ~all
v=DMARC1; p=reject; rua=mailto:c81f00bf37db4beaa411231226ada257@dmarc-reports.cloudflare.net

NS 2

kami.ns.cloudflare.com
logan.ns.cloudflare.com

SOA 1

kami.ns.cloudflare.com dns.cloudflare.com

TLS Certificates (3)

Common Name	Issuer	Expires
`duplex.cz`	C=US, O=Google Trust Services, CN=WE1	Sun, 04 Oct 2026 08:35:37 +0000
`WE1`	C=US, O=Google Trust Services LLC, CN=GTS Root R4	Tue, 20 Feb 2029 14:00:00 +0000
`GTS Root R4`	C=BE, O=GlobalSign nv-sa, 2.5.4.11=Root CA, CN=GlobalSign Root CA	Fri, 28 Jan 2028 00:00:42 +0000

Subdomains (2)

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 duplex.cz. It updates itself. It attests a signed observation - not that the site is safe.

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

Ed25519 Receipt

Receipt ID: rcpt_5d7f7de4fed39e1a
Output Hash: d47a8b440155fc887084fa00e6bf5aeb1f502e024b17da5b5e9ce9b315415a55
Signature: ed25519:ebc739d0b8e63cb713a97c25ee326fb0f2beece1cc2a03db73a7cb75282fc1d82df728c528c97e6d32c561b01d928c5da86c79a0591912098b9338c9f9d3c805
Public Key: ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9
Parent: (genesis)
Plane: fast

Verify this in your browser

Permalink: https://domaindrift.io/t/duplex.cz