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SSL check results of hs0304.knet.ne.jp

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Discover if the mail servers for hs0304.knet.ne.jp can be reached through a secure connection.

To establish a secure connection a mail server has to offer STARTTLS (SSL), a trustworthy SSL certificate, support for the Diffie-Hellman-Algorithm to guarantee Perfect Forward Secrecy and must not be vulnerable against the Heartbleed attack. Futhermore we recommend using end-to-end encryption with GnuPG.

Summary

JSON Refresh

Report created Mon, 14 Sep 2026 04:52:24 +0000

The mailservers of hs0304.knet.ne.jp can be reached through a secure connection.

Servers

Incoming Mails

These servers are responsible for incoming mails to @hs0304.knet.ne.jp addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
hs0304.knet.ne.jp
210.233.182.19
 -
supported
*.knet.ne.jp
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • TLSv1.1
  • TLSv1.0
  • SSLv3
11 s

Outgoing Mails

We have not received any emails from a @hs0304.knet.ne.jp address so far. Test mail delivery

Certificates

First seen at:

CN=*.knet.ne.jp

Certificate chain
Subject
Common Name (CN)
  • *.knet.ne.jp
Alternative Names
  • *.knet.ne.jp
  • knet.ne.jp
Issuer
Country (C)
  • JP
Organization (O)
  • Japan Registry Services Co., Ltd.
Common Name (CN)
  • JPRS Domain Validation Authority - G4
validity period
Not valid before
2026-02-05
Not valid after
2027-02-28
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
Fingerprints
SHA256
F1:B8:98:FA:41:04:57:95:5A:58:A1:94:94:AB:C3:1B:D6:5A:AD:17:0A:11:25:60:99:E2:A4:40:99:D3:EA:93
SHA1
9E:28:AD:69:CC:82:21:BB:A7:93:FF:39:66:70:F4:D8:B0:35:16:79
X509v3 extensions
authorityKeyIdentifier
  • keyid:7C:24:CE:0D:A4:38:2D:C7:B3:63:5E:A7:78:7A:8D:1D:4C:2E:C7:15
authorityInfoAccess
  • CA Issuers - URI:http://repo.pubcert.jprs.jp/sppca/jprs/dvca_g4/JPRS_DVCA_G4_DER.cer
  • OCSP - URI:http://dv.g4.ocsp.pubcert.jprs.jp
certificatePolicies
  • Policy: 1.3.6.1.4.1.53827.1.1.4
  • CPS: http://jprs.jp/pubcert/info/repository/
  • Policy: 2.23.140.1.2.1
crlDistributionPoints
  • Full Name:
  • URI:http://repo.pubcert.jprs.jp/sppca/jprs/dvca_g4/fullcrl.crl
subjectKeyIdentifier
  • 10:24:4E:55:27:AE:A2:EB:B5:6C:46:0A:EC:E1:8D:5E:C2:D6:9A:16
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : D6:D5:8D:A9:D0:17:53:F3:6A:4A:A0:C7:57:49:02:AF:
  • EB:C7:DC:2C:D3:8C:D9:F7:64:C8:0C:89:19:1E:9F:02
  • Timestamp : Feb 5 00:28:13.219 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:21:00:D6:1B:2C:60:0E:1B:64:9C:DC:55:56:
  • 45:9A:D4:36:2D:B5:00:2D:23:48:C4:8A:77:69:3F:1D:
  • 96:0F:11:16:B0:02:20:76:0D:F4:A8:97:0D:C0:EB:94:
  • 01:AC:50:74:0E:F1:EC:76:30:67:E3:1D:23:54:66:8F:
  • 0E:04:06:D1:C6:99:01
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 44:C2:BD:0C:E9:14:0E:64:A5:C9:4A:01:93:0A:5A:A1:
  • BB:35:97:0E:00:EE:11:16:89:68:2A:1C:44:D7:B5:66
  • Timestamp : Feb 5 00:28:14.913 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:21:00:CD:20:DD:F0:24:2C:38:BC:94:CA:95:
  • 41:7D:2C:51:B0:8E:F9:BD:19:B2:1B:8C:46:1E:A5:24:
  • B4:DD:7E:6B:13:02:20:32:94:A7:89:49:55:FA:7E:21:
  • 97:06:D8:D8:9B:3C:98:86:D2:DF:C3:47:BF:4B:39:06:
  • DF:7E:F1:87:59:FE:0C
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 4C:63:DC:98:E5:9C:1D:AB:88:F6:1E:8A:3D:DE:AE:8F:
  • AB:44:A3:37:7B:5F:9B:94:C3:FB:A1:9C:FC:C1:BE:26
  • Timestamp : Feb 5 00:28:15.344 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:2E:B7:99:2D:2F:AA:DC:9C:CE:23:AB:F5:
  • 72:8D:9D:BD:E8:DA:5C:9D:89:CC:8E:BC:E8:74:17:F8:
  • A7:0A:42:0D:02:21:00:C8:B3:03:73:BC:22:67:6C:AB:
  • D3:61:9E:1A:09:7F:E4:52:49:FD:A3:48:DF:B4:6B:2D:
  • AF:16:DC:96:22:79:88
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 1C:9F:68:2C:E9:FA:F0:45:69:50:F8:1B:96:8A:87:DD:
  • DB:32:10:D8:4C:E6:C8:B2:E3:82:52:4A:C4:CF:59:9F
  • Timestamp : Feb 5 00:28:16.198 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:44:02:20:52:75:45:10:40:DE:C7:C3:5E:08:26:3F:
  • E1:6A:F5:2E:33:30:11:55:2B:53:5F:34:AB:50:EE:97:
  • 40:AF:49:22:02:20:33:AC:A6:81:3F:EE:BB:6C:53:11:
  • F7:AE:4E:53:98:FB:6F:55:4D:1F:9E:A8:6E:99:F4:ED:
  • 78:EF:67:F0:9E:67
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 60:4C:9A:AF:7A:7F:77:5F:01:D4:06:FC:92:0D:C8:99:
  • EB:0B:1C:7D:F8:C9:52:1B:FA:FA:17:77:3B:97:8B:C9
  • Timestamp : Feb 5 00:28:16.794 2026 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:21:00:97:A2:3D:DF:6F:E1:DA:1B:60:16:9D:
  • 05:81:9B:4D:5D:04:2B:81:3C:D2:83:F5:97:BF:7C:13:
  • 6E:E3:23:D6:75:02:20:0B:91:53:01:83:A5:7F:C7:68:
  • 47:92:65:AB:04:4E:F7:7A:92:7F:2D:95:99:BB:95:21:
  • 29:3A:54:1B:49:02:E4