SSL-Tools

SSL check results of netcup.de

NEW You can also bulk check multiple servers.

Discover if the mail servers for netcup.de 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 Tue, 16 Sep 2025 05:54:16 +0000

No connection to the mailservers of netcup.de could be established.

Servers

Incoming Mails

These servers are responsible for incoming mails to @netcup.de addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
smtp.netcup.net
2a03:4000:0:1::e1aa
Results incomplete
10
supported
*.netcup.net
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
1 s
smtp.netcup.net
46.38.225.170
Results incomplete
10
supported
*.netcup.net
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
1 s
backupmx-fra1.netcup.net
2a03:4001:0:104::29
Results incomplete
20 not checked
DANE
missing
PFS
not checked
Heartbleed
not checked
Weak ciphers
not checked
11 s
backupmx-fra1.netcup.net
188.68.63.41
Results incomplete
20
supported
*.netcup.net
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
1 s

Outgoing Mails

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

Certificates

First seen at:

CN=*.netcup.net

Certificate chain
Subject
Common Name (CN)
  • *.netcup.net
Alternative Names
  • *.netcup.net
  • netcup.net
Issuer
Country (C)
  • US
Organization (O)
  • DigiCert Inc
Organizational Unit (OU)
  • www.digicert.com
Common Name (CN)
  • RapidSSL TLS RSA CA G1
validity period
Not valid before
2025-09-10
Not valid after
2026-09-09
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
  • TLS Web Client Authentication
Fingerprints
SHA256
8A:29:49:62:7A:4A:EC:13:4D:6C:08:E7:1C:E7:80:03:3A:28:78:99:D3:38:61:ED:D2:7C:43:CD:8E:F4:2C:C9
SHA1
6F:67:22:0F:D1:AB:AD:51:CC:C4:C1:B0:9E:FA:CF:32:30:B9:90:AC
X509v3 extensions
authorityKeyIdentifier
  • keyid:0C:DB:6C:82:49:0F:4A:67:0A:B8:14:EE:7A:C4:48:52:88:EB:56:38
subjectKeyIdentifier
  • EA:D7:B6:20:A8:5D:53:51:0D:5B:24:EB:07:67:13:21:0A:BD:2F:E4
certificatePolicies
  • Policy: 2.23.140.1.2.1
  • CPS: http://www.digicert.com/CPS
crlDistributionPoints
  • Full Name:
  • URI:http://cdp.rapidssl.com/RapidSSLTLSRSACAG1.crl
authorityInfoAccess
  • OCSP - URI:http://status.rapidssl.com
  • CA Issuers - URI:http://cacerts.rapidssl.com/RapidSSLTLSRSACAG1.crt
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : D8:09:55:3B:94:4F:7A:FF:C8:16:19:6F:94:4F:85:AB:
  • B0:F8:FC:5E:87:55:26:0F:15:D1:2E:72:BB:45:4B:14
  • Timestamp : Sep 10 11:14:38.524 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:46:02:21:00:DE:06:5F:85:E3:10:AE:0F:E6:94:86:
  • C5:47:27:4A:C0:53:89:7A:BC:E5:DC:54:03:81:90:F4:
  • 3B:17:43:77:CB:02:21:00:A0:BD:07:6D:B8:D9:62:7A:
  • 08:20:2F:C6:D4:CC:FC:B1:80:14:B1:DD:D1:D5:43:F5:
  • CD:E3:BD:4B:A3:82:0D:E4
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : C2:31:7E:57:45:19:A3:45:EE:7F:38:DE:B2:90:41:EB:
  • C7:C2:21:5A:22:BF:7F:D5:B5:AD:76:9A:D9:0E:52:CD
  • Timestamp : Sep 10 11:14:38.513 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:21:00:BB:C6:0F:33:9B:33:5F:42:24:EA:4C:
  • AF:58:32:DA:B1:60:2B:7D:F7:1F:A2:E4:D5:BC:8B:F7:
  • E3:54:3E:A3:92:02:20:21:85:F5:96:6B:E3:23:7E:77:
  • E4:60:AF:40:F1:14:D1:F8:9E:FA:38:C4:F2:3D:67:E1:
  • 00:C5:2A:DB:9E:22:CB
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 94:4E:43:87:FA:EC:C1:EF:81:F3:19:24:26:A8:18:65:
  • 01:C7:D3:5F:38:02:01:3F:72:67:7D:55:37:2E:19:D8
  • Timestamp : Sep 10 11:14:38.528 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:44:02:20:34:D2:0B:43:4A:AB:3E:6A:A3:D0:3D:44:
  • 09:72:B8:D7:0E:F9:28:8D:88:9C:EC:BA:A3:39:1E:62:
  • AB:20:0C:7F:02:20:41:C8:49:AD:F8:8D:A8:8D:B7:0F:
  • 2C:49:8F:E5:60:66:FB:15:5C:A6:8D:4B:A8:19:36:E8:
  • 14:2A:BC:26:60:2C