upk.ch

Observed Aug 10, 2026, 06:44 UTC (4d ago). Every field below was attested with an Ed25519 signature at scan time.

This reading of upk.ch was taken 4d ago

upk.ch is on the survey sweep, which works its way across the whole catalog rather than returning to one name on a schedule. Putting upk.ch under watch moves it to the fast lane, where DomainDrift re-checks it about every 5 minutes and signs each reading, so a change becomes a dated event within minutes instead of waiting for the sweep to come round.

Watch upk.ch Watching a domain needs a DRM3 account. The reading above stays free and public either way.

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Up right now

Secured byLet's Encrypt

Also usesAppleMicrosoft 365

IPv6 · 1 subdomain · majestic

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

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

upk.ch

A / AAAA

185.221.40.252a09:f00:b:1::9

2a09serves the site

dnsext.uhbs.chscsnms.switch.ch

uhbs.ch + switch.chanswers its DNS

mailgw02.usb.chmailgw01.usb.ch

usb.chreceives its email

TLS

upk.ch

Let's Encryptissued its certificate

DNS Records

A 1

185.221.40.25

AAAA 1

2a09:f00:b:1::9

MX 2

10mailgw02.usb.ch
10mailgw01.usb.ch

TXT 4

_10jspi6o5nmkedophyx2mijox6mpvy7
MS=811B7A8D2918E7A069D32684AE37CE3332626986
v=spf1 mx:hin.ch ip4:185.221.40.25 ip4:62.12.135.246 ip4:145.250.210.44/31 ip4:88.82.97.0/29 ip4:88.82.97.25 ip4:88.82.97.26 ip6:2a09:f00:b:1::9 include:_spf.rexx-suite.com include:spf.qb-feedback.com include:spf.nl2go.com include:spf.protection.outlook.com -all
apple-domain-verification=SwQxYhFggntXxwxm

NS 2

dnsext.uhbs.ch
scsnms.switch.ch

SOA 1

dnsext.uhbs.ch netzwerk.usb.ch

DMARC_RECORDS 1

v=DMARC1;p=none;

TLS Certificates (3)

Common Name	Issuer	Expires
`upk.ch`	C=US, O=Let's Encrypt, CN=YR1	Sat, 12 Sep 2026 01:08:07 +0000
`YR1`	C=US, O=ISRG, CN=Root YR	Sat, 02 Sep 2028 23:59:59 +0000
`Root YR`	C=US, O=Internet Security Research Group, CN=ISRG Root X1	Thu, 02 Sep 2032 23:59:59 +0000

Subdomains (1)

www.upk.ch

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 Receipt

Receipt ID: rcpt_e172eb9a08245f66
Output Hash: 614e6342f91a76986618141efd397aff40c4b70abbd18da3f775b053d6133b91
Signature: ed25519:dc6c833e63fa97b939221c918a2fb7649ceb8f442c29e6421567c14c95ccf2d119b6905b8c0171e0591ec43846b65403822d2637836c084936f64d3d9b7fbd02
Public Key: ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9
Parent: (genesis)
Plane: fast

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Permalink: https://domaindrift.io/t/upk.ch