jfn.co.jp
Observed Aug 16, 2026, 07:42 UTC (16h 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 · tranco
Every line above is a signed observation. Check the math at the bottom of the page.
DRIFT
Steady. No change on record for jfn.co.jp in the last day; this reading matches the one before it. The steady record is signed like every other reading. Watch it to catch the next move the moment it lands.
INFRASTRUCTURE MAPwhat jfn.co.jp actually stands on - every host below is a signed observation
jfn.co.jp
A / AAAA
157.7.44.237
unattributedserves the site
NS
01.dnsv.jp02.dnsv.jp03.dnsv.jp04.dnsv.jp
dnsv.jpanswers its DNS
MX
alt1.aspmx.l.google.comalt2.aspmx.l.google.comalt3.aspmx.l.google.comalt4.aspmx.l.google.com+1 more
Google Workspacereceives its email
TLS
jfn.co.jp
Let's Encryptissued its certificate
DNS Records
A 1
157.7.44.237
MX 5
5alt1.aspmx.l.google.com5alt2.aspmx.l.google.com10alt3.aspmx.l.google.com10alt4.aspmx.l.google.com1aspmx.l.google.com
TXT 3
google-site-verification=ZN785D46M2RPp-qTtza0dYmGY4pYCGhvOuaf99yXGBgv=spf1 +ip4:35.73.64.243 +ip4:54.64.97.35 +ip4:52.192.143.223 +ip4:54.250.173.218 +ip4:210.236.39.217/32 include:_spf.google.com ~allv=spf1 include:media-radar.jp -all
NS 4
01.dnsv.jp02.dnsv.jp03.dnsv.jp04.dnsv.jp
SOA 1
01.dnsv.jp hostmaster.dnsv.jp
DMARC_RECORDS 1
v=DMARC1; p=none; rua=mailto:kawahara@jfn.co.jp
TLS Certificates (3)
| Common Name | Issuer | Expires |
|---|---|---|
jfn.co.jp |
C=US, O=Let's Encrypt, CN=YR2 | Tue, 10 Nov 2026 10:53:19 +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_69574c99bd0e7fe4- Output Hash
8f93237ba6c42ed1440b137b0bd3fb65501c395eb735daee3036b632fbc242e3- Signature
ed25519:9a36ec18bcb6cef9867e307be41872330acea76c34baa40c595da513b1057f13f66c26116774626e13586a47736c5c3b09f16a5b8f9197a8cc67575e9b07e505- Public Key
ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9- Parent
(genesis)- Plane
- fast