ustclug.org

Observed Jul 27, 2026, 22:38 UTC (5d 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 ustclug.org actually stands on - every host below is a signed observation

ustclug.org

A / AAAA

104.21.34.197172.67.164.1192606:4700:3031::6815:22c52606:4700:3033::ac43:a477

Cloudflareserves the site

ns-c.ustclug.orgns-a.ustclug.orgns-b.ustclug.org

ustclug.organswers its DNS

smtp.google.com

Google Workspacereceives its email

TLS

ustclug.org

Google Trust Servicesissued its certificate

DNS Records

A 2

104.21.34.197
172.67.164.119

AAAA 2

2606:4700:3031::6815:22c5
2606:4700:3033::ac43:a477

MX 1

1smtp.google.com

TXT 7

ca3-8a295376a5bc449482347bb09fc07add
v=spf1 a:ip-list.mail.ustclug.org include:_spf.google.com include:spf.protection.outlook.com include:mailgun.org ~all
MS=ms43950213
734941312-18191251
google-site-verification=ibXIjx6-PLlu9n-Pw1CRjCiQ75nJTRSWi6Y-rm4nznI
verification-code-site-App_feishu=IDMUhY2RhXjsCjXGr801
v=DMARC1; p=none

NS 3

ns-c.ustclug.org
ns-a.ustclug.org
ns-b.ustclug.org

SOA 1

ns-a.ustclug.org lug.ustc.edu.cn

TLS Certificates (3)

Common Name	Issuer	Expires
`ustclug.org`	C=US, O=Google Trust Services, CN=WE1	Sun, 04 Oct 2026 05:38:41 +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.

Verify this receipt

Put the receipt on your own site. A live badge showing what DomainDrift observes and signs for ustclug.org. It updates itself. It attests a signed observation - not that the site is safe.

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

Ed25519 Receipt

Receipt ID
Output Hash: cb98120467f4d0eff3d9cc5c5a0839b9fc5b51c82dfe6193c46609d07cf878a8
Signature: (receipt not held at this host)
Public Key: connor-fast-v0.13.0
Parent: (genesis)
Plane: fast

Verify this in your browser

Permalink: https://domaindrift.io/t/ustclug.org