SSL-Tools

SSL check results of knack.gmbh

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Discover if the mail servers for knack.gmbh 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 Thu, 13 Mar 2025 07:16:23 +0000

The mailservers of knack.gmbh can be reached through a secure connection.

Servers

Incoming Mails

These servers are responsible for incoming mails to @knack.gmbh addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
mail.knack.gmbh
2a01:239:32e:c100::
 10
supported
knack.gmbh
DANE
valid
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
2 s
mail.knack.gmbh
212.227.143.87
 10
supported
knack.gmbh
DANE
valid
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
1 s

Outgoing Mails

We have not received any emails from a @knack.gmbh address so far. Test mail delivery

Certificates

First seen at:

CN=knack.gmbh

Certificate chain
  • knack.gmbh
    • remaining
    • 2048 bit
    • sha256WithRSAEncryption
      • R10
        • remaining
        • 2048 bit
        • sha256WithRSAEncryption
          • ISRG Root X1 (Certificate is self-signed.)
            • remaining
            • 4096 bit
            • sha256WithRSAEncryption
Subject
Common Name (CN)
  • knack.gmbh
Alternative Names
  • *.knack.gmbh
  • knack.gmbh
Issuer
Country (C)
  • US
Organization (O)
  • Let's Encrypt
Common Name (CN)
  • R10
validity period
Not valid before
2025-03-07
Not valid after
2025-06-05
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
  • TLS Web Client Authentication
Fingerprints
SHA256
CB:68:F7:BF:8B:8F:F3:28:99:C2:CD:B4:D5:59:AD:F5:49:45:96:E9:81:A1:57:C9:42:5E:34:94:A4:65:73:6A
SHA1
C7:9A:09:C6:18:52:10:EA:BB:3B:B8:3C:4F:CA:D8:06:E7:55:19:98
X509v3 extensions
subjectKeyIdentifier
  • C6:19:96:0E:DE:D0:1A:6A:83:29:8C:AE:2F:95:A3:5D:6B:99:04:EC
authorityKeyIdentifier
  • keyid:BB:BC:C3:47:A5:E4:BC:A9:C6:C3:A4:72:0C:10:8D:A2:35:E1:C8:E8
authorityInfoAccess
  • OCSP - URI:http://r10.o.lencr.org
  • CA Issuers - URI:http://r10.i.lencr.org/
certificatePolicies
  • Policy: 2.23.140.1.2.1
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 4E:75:A3:27:5C:9A:10:C3:38:5B:6C:D4:DF:3F:52:EB:
  • 1D:F0:E0:8E:1B:8D:69:C0:B1:FA:64:B1:62:9A:39:DF
  • Timestamp : Mar 7 09:59:43.452 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:21:00:DB:CF:22:CA:22:92:58:9B:DD:F7:E6:
  • 65:8D:8D:29:15:59:34:98:17:20:44:D1:F6:7A:35:F5:
  • 24:5F:42:B3:4B:02:20:3C:2C:38:DF:DE:EB:9D:28:5C:
  • 31:4D:01:09:7B:4A:AE:3B:85:F2:65:14:92:09:C1:CB:
  • E2:E2:AA:C9:9F:1D:08
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : E0:92:B3:FC:0C:1D:C8:E7:68:36:1F:DE:61:B9:96:4D:
  • 0A:52:78:19:8A:72:D6:72:C4:B0:4D:A5:6D:6F:54:04
  • Timestamp : Mar 7 09:59:43.500 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:20:7D:8D:94:92:E2:5E:7C:0E:26:A5:E4:B5:
  • FD:40:16:CF:64:92:71:5B:B8:3E:EA:26:13:5B:32:2F:
  • 74:62:98:EA:02:21:00:CC:83:17:09:D5:AA:74:F2:BB:
  • 4F:FF:F9:98:36:AB:D1:B9:44:B1:59:1E:94:12:AA:94:
  • 87:0B:CD:01:4E:C4:CD

DANE

DNS-based Authentication of Named Entities (DANE) is a protocol to allow X.509 certificates to be bound to DNS using TLSA records and DNSSEC.

Name Options DNSSEC Matches
_25._tcp.mail.knack.gmbh
  • DANE-EE: Domain Issued Certificate
  • Use full certificate
  • SHA-256 Hash
valid
valid