ost.ch

Observed Jul 21, 2026, 17:01 UTC (2d 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

Email byMicrosoft 365

Secured byLet's Encrypt

Also usesGoogle Search ConsoleAtlassianMiro

IPv6 · 6 subdomains · tranco_100k

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

INFRASTRUCTURE MAPwhat ost.ch actually stands on - every host below is a signed observation

ost.ch

A / AAAA

146.136.212.332001:620:1c0:d212:0:2ff:fe12:33

2001serves the site

dns03.ost.chdns02.ost.chdns01.ost.ch

ost.chanswers its DNS

ost-ch.mail.protection.outlook.com

Microsoft 365receives its email

TLS

ost.ch

Let's Encryptissued its certificate

DNS Records

A 1

146.136.212.33

AAAA 1

2001:620:1c0:d212:0:2ff:fe12:33

MX 1

0ost-ch.mail.protection.outlook.com

TXT 14

v=spf1 a:sismtp01.ost.ch a:smtp01.ost.ch a:smtp02.ost.ch include:spf.protection.outlook.com include:sendgrid.net -all
61sjwdyp9nf20ntp906wskswwq3vtqxq
dell-technologies-domain-verification=ost.ch_ae6a1c17-bbb6-4a86-9d07-7009ba89b6ad_1704450717
QuoVadis=f5454eb2-12d3-4af4-8db6-173f2d4c8e67
autodesk-domain-verification=EK5gPHyJPVB6rhjz-3ig
google-site-verification=1OL9JT_78j1_2bbGT5J54ZLFzcjOKMC1dCO8nf6hrBw
atlassian-domain-verification=mAHOHBOXxMe1UY/dDOFAqWSzeWJyoFosKuUf0NbaXHjWQcQOedw8QsLnPhPTF+pU
MS=ms41259948
google-site-verification=uXsX_aEfoeSpZ9tzZgcmmRCl99PcBClh8usP1_eoLDM
mentimeter-fe4edff1-5775-476e-9db7-8f48b5ad32e8

NS 3

dns03.ost.ch
dns02.ost.ch
dns01.ost.ch

SOA 1

dns01.ost.ch sysreports.ost.ch

SRV 4

sidv3690.ost.ch:5060 p10
sidv3690.ost.ch:5061 p10
sidv3690.ost.ch:5222 p10
sidv3690.ost.ch:5269 p10

TLS Certificates (2)

Common Name	Issuer	Expires
`ost.ch`	C=US, O=Let's Encrypt, CN=E7	Sun, 23 Aug 2026 16:17:39 +0000
`E7`	C=US, O=Internet Security Research Group, CN=ISRG Root X1	Fri, 12 Mar 2027 23:59:59 +0000

Subdomains (6)

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 ost.ch. It updates itself. It attests a signed observation - not that the site is safe.

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

Ed25519 Receipt

Receipt ID: rcpt_9c9bc22ba780b7aa
Output Hash: 921be647022f47924db521c0f6e4428b7c6f50c48540a9ec7668c8bded63bbf1
Signature: ed25519:9c14e87eac88c365e1b43f3842553d81241077742d957573f16037124cd893fc330312108b57ea2909b1ff51088356b4a8620b18169035d9f23f5108a544390f
Public Key: ed25519:178c3bd0f57d9d64b83cc4630753381e1a465005a2bbba3d032371f24af0bfd8
Parent: (genesis)
Plane: fast

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