sfn.cn

Observed Jul 18, 2026, 13:37 UTC (3d ago). Every field below was attested with an Ed25519 signature at scan time.

Up right now

Runs onComputer Network Information Center of Chinese Academy of Sciences (CNIC-CAS)

Secured byChina Financial Certification Authority

Also usesGoogle Search Console

IPv6 · 1 subdomain · tranco_40k

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

INFRASTRUCTURE MAPwhat sfn.cn actually stands on - every host below is a signed observation

sfn.cn

A / AAAA

210.72.13.1772409:8c04:1001:1e::132409:8c04:1001:1e::bb

Computer Network Information Center of Chinese Academy of Sciences (CNIC-CAS)serves the site

ns1.sfn.cnns2.sfn.cn

sfn.cnanswers its DNS

mail.sfn.cn

sfn.cnreceives its email

TLS

www.guokeyun.com

China Financial Certification Authorityissued its certificate

DNS Records

A 1

210.72.13.177

AAAA 2

2409:8c04:1001:1e::13
2409:8c04:1001:1e::bb

MX 1

6mail.sfn.cn

TXT 3

118r7j35mlyns2sywdmvghfyfndmrfyl
google-site-verification=tuID6n28tUg-VVKqsOqe6EtOYfV-istMBCdbi5_xJ5s
v=spf1 include:spf.icoremail.net ~all

NS 2

ns1.sfn.cn
ns2.sfn.cn

SOA 1

ns1.sfn.cn root.ns1.sfn.cn

TLS Certificates (4)

Common Name	Issuer	Expires
`www.guokeyun.com`	C=CN, O=China Financial Certification Authority, CN=CFCA EV OCA	Thu, 11 Mar 2027 06:19:52 +0000
`CFCA EV OCA`	C=CN, O=China Financial Certification Authority, CN=CFCA EV ROOT	Sat, 29 Dec 2029 06:06:31 +0000
`CFCA EV ROOT`	C=CN, O=China Financial Certification Authority, CN=CFCA EV ROOT	Mon, 31 Dec 2029 03:07:01 +0000
`CFCA EV OCA`	C=CN, O=China Financial Certification Authority, CN=CFCA EV ROOT	Sat, 29 Dec 2029 06:06:31 +0000

Subdomains (1)

www.sfn.cn

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 sfn.cn. It updates itself. It attests a signed observation - not that the site is safe.

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

Ed25519 Receipt

Receipt ID: 71e57375-1d91-4821-978a-74e089b60d9d
Output Hash: 3a0389dfe88b0ce62e9705d485444779a69321bcbb1e75f9be123c667b424bf2
Signature: ed25519:e40308e6f6a8e754806d4a8b76c95cbd00213998d72fabaa5c0823221efe4e5cdad26a56f13628d767f631ab5b511c6a3ff2ab9958f9b2e0a0f2e4ac5d16e60c
Public Key: ed25519:178c3bd0f57d9d64b83cc4630753381e1a465005a2bbba3d032371f24af0bfd8
Parent: (genesis)
Plane: fast

Verify this in your browser

Permalink: https://domaindrift.io/t/sfn.cn