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zcal.co

Observed Aug 2, 2026, 19:57 UTC (13h 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 · tranco
Every line above is a signed observation. Check the math at the bottom of the page.
INFRASTRUCTURE MAPwhat zcal.co actually stands on - every host below is a signed observation
zcal.co
A / AAAA
172.67.183.242104.21.32.572606:4700:3031::ac43:b7f22606:4700:3037::6815:2039
Cloudflareserves the site
NS
derek.ns.cloudflare.comvita.ns.cloudflare.com
cloudflare.comanswers its DNS
MX
aspmx.l.google.comalt3.aspmx.l.google.comalt4.aspmx.l.google.comalt1.aspmx.l.google.com+1 more
Google Workspacereceives its email
TLS
zcal.co
Google Trust Servicesissued its certificate

DNS Records

A 2

  • 172.67.183.242
  • 104.21.32.57

AAAA 2

  • 2606:4700:3031::ac43:b7f2
  • 2606:4700:3037::6815:2039

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 6

  • MS=CF52360B98C7BE2669C4544F91BE60ADED89B1F6
  • firebase=static-concept-220701
  • google-site-verification=NKwtQhbdfDcCP_UlrnHPTEybn-GrzlIeEAviwQwjcck
  • google-site-verification=T4ApDoKzzl0bTURmvbMFXCubnFUIxE248R4uqobXJew
  • google-site-verification=Y4jahCL7fqRgxSaTMArtT662IhxX-Hn0g7uXHXFvTAw
  • v=spf1 include:_spf.firebasemail.com ~all

NS 2

  • derek.ns.cloudflare.com
  • vita.ns.cloudflare.com

SOA 1

  • derek.ns.cloudflare.com dns.cloudflare.com

DMARC_RECORDS 1

  • v=DMARC1; p=none

TLS Certificates (3)

Common NameIssuerExpires
zcal.co C=US, O=Google Trust Services, CN=WE1 Thu, 22 Oct 2026 13:24:52 +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 (0)

None observed.

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.

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Ed25519 Receipt

Receipt ID
rcpt_3abd8a25addfce83
Output Hash
3bf7298ea0ba114eb89db7eca9787e2721bb0a519ce9d040eca2716d84fc3ac6
Signature
ed25519:f25fa7e3fb871cc4a891f8138981610cc8ab917c4bfb2bcd814994fffc9f73f917715a9e409ee51f71f8458306183f78ff9365e0b73470f7a85786bdaa49250c
Public Key
ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9
Parent
(genesis)
Plane
fast
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