jk-contest.jp
Observed Aug 16, 2026, 13:17 UTC (7h 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.
Up right now
Email byGoogle Workspace
Google WorkspaceSecured byLet's Encrypt
Let's EncryptAlso usesGoogle Search Console
Google Search Console1 subdomain · majestic
Every line above is a signed observation. Check the math at the bottom of the page.
INFRASTRUCTURE MAPwhat jk-contest.jp actually stands on - every host below is a signed observation
jk-contest.jp
A / AAAA
49.212.243.169
unattributedserves the site
NS
ns1.dns.ne.jpns2.dns.ne.jp
ne.jpanswers its DNS
MX
smtp.google.com
Google Workspacereceives its email
TLS
jk-contest.jp
Let's Encryptissued its certificate
DNS Records
A 1
49.212.243.169
MX 1
1smtp.google.com
TXT 2
google-site-verification=JTyfS-dOcpHi9mjfGLLJ-TSLdgvbh4AjI3V1KI9LsxEv=spf1 include:_spf.google.com ~all
NS 2
ns1.dns.ne.jpns2.dns.ne.jp
SOA 1
master.dns.ne.jp tech.sakura.ad.jp
DMARC_RECORDS 1
v=DMARC1; p=none; rua=mailto:admin@jk-contest.jp; aspf=r; adkim=r
TLS Certificates (3)
| Common Name | Issuer | Expires |
|---|---|---|
jk-contest.jp |
C=US, O=Let's Encrypt, CN=YR2 | Wed, 23 Sep 2026 18:18:43 +0000 |
YR2 |
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)
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 receiptEd25519 Receipt
- Receipt ID
rcpt_1ff06b041f94c03d- Output Hash
4ebc945f110c0a46b6fe5731095e7ea5941f0c4a9891380d98752ba7d1ccc534- Signature
ed25519:ed8e258445f743226a730aeeeddc3222c2af3da31e9ca3fa3732df4ce19a9ed570333f5918f6c423399057423261a2742575cbd896f2b382426589dcbb4cb90e- Public Key
ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9- Parent
(genesis)- Plane
- fast