SSL-Tools

SSL check results of t0b1.dev

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Discover if the mail servers for t0b1.dev 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, 30 Oct 2025 01:30:12 +0000

The mailservers of t0b1.dev can be reached through a secure connection.

Servers

Incoming Mails

These servers are responsible for incoming mails to @t0b1.dev addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
mail.t0b1.dev
2a03:4000:58:b21::1
 10
supported
mail.t0b1.dev
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
4 s
mail.t0b1.dev
202.61.193.166
 10
supported
mail.t0b1.dev
DANE
missing
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
5 s

Outgoing Mails

We have not received any emails from a @t0b1.dev address so far. Test mail delivery

Certificates

First seen at:

CN=mail.t0b1.dev

Certificate chain
  • mail.t0b1.dev
    • remaining
    • 2048 bit
    • sha256WithRSAEncryption
      • R13
        • remaining
        • 2048 bit
        • sha256WithRSAEncryption
          • ISRG Root X1 (Certificate is self-signed.)
            • remaining
            • 4096 bit
            • sha256WithRSAEncryption
Subject
Common Name (CN)
  • mail.t0b1.dev
Alternative Names
  • mail.t0b1.dev
Issuer
Country (C)
  • US
Organization (O)
  • Let's Encrypt
Common Name (CN)
  • R13
validity period
Not valid before
2025-09-26
Not valid after
2025-12-25
This certifcate has been verified for the following usages:
  • Digital Signature
  • Key Encipherment
  • TLS Web Server Authentication
  • TLS Web Client Authentication
Fingerprints
SHA256
F4:E4:EC:62:61:13:63:4D:6C:44:AB:C1:EB:D2:29:66:F6:0B:33:70:9B:0D:7A:C6:E8:D4:82:A8:94:4C:D3:C0
SHA1
51:A5:BE:0C:5A:6C:10:9B:E3:49:7C:10:49:8F:53:98:CF:FA:66:2F
X509v3 extensions
subjectKeyIdentifier
  • 65:9B:4B:37:D5:24:5D:6B:28:3A:CE:B3:01:AD:75:60:BA:61:41:BB
authorityKeyIdentifier
  • keyid:E7:AB:9F:0F:2C:33:A0:53:D3:5E:4F:78:C8:B2:84:0E:3B:D6:92:33
authorityInfoAccess
  • CA Issuers - URI:http://r13.i.lencr.org/
certificatePolicies
  • Policy: 2.23.140.1.2.1
crlDistributionPoints
  • Full Name:
  • URI:http://r13.c.lencr.org/56.crl
ct_precert_scts
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : ED:3C:4B:D6:E8:06:C2:A4:A2:00:57:DB:CB:24:E2:38:
  • 01:DF:51:2F:ED:C4:86:C5:70:0F:20:DD:B7:3E:3F:E0
  • Timestamp : Sep 26 14:55:58.419 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:45:02:21:00:9C:7E:0A:B3:D4:AD:19:EA:B4:8B:C6:
  • 8E:DE:37:1A:97:85:0B:45:61:E2:9E:7D:26:DC:E1:3B:
  • 81:48:5A:59:A5:02:20:31:72:5E:AF:17:04:B3:F4:C7:
  • 31:E9:83:A6:D2:EF:89:93:E7:8E:B7:E5:E6:BE:06:7B:
  • DF:C5:FE:B6:7D:8C:46
  • Signed Certificate Timestamp:
  • Version : v1 (0x0)
  • Log ID : 12:F1:4E:34:BD:53:72:4C:84:06:19:C3:8F:3F:7A:13:
  • F8:E7:B5:62:87:88:9C:6D:30:05:84:EB:E5:86:26:3A
  • Timestamp : Sep 26 14:55:58.423 2025 GMT
  • Extensions: none
  • Signature : ecdsa-with-SHA256
  • 30:44:02:20:38:84:0C:4D:B2:E4:55:2F:23:0E:89:28:
  • 41:99:31:3E:65:33:D7:60:39:B7:D8:B8:64:E2:F2:4F:
  • B8:1F:0D:D9:02:20:09:8B:CB:49:77:35:26:F0:66:14:
  • 27:B8:52:1A:87:81:77:A8:E9:56:F1:D4:36:B1:FF:13:
  • 55:26:72:CD:B5:88