DNS
THE CERTIFICATE BEHIND THE CONNECTION

TLS certificate checker.

Inspect SSL/TLS certificates for any public domain or subdomain.

Checks HTTPS on port 443, including subject alternative names, validity dates and the presented chain.

SSL certificate

TLSv1.3

mx.biaman.pl · 212.33.64.30:443

Verified

Certificate chain, hostname and dates verified using this server’s CA store.

Subject
C=PL ST=podlaskie L=Białystok O=Politechnika Białostocka CN=mx.biaman.pl
Issuer
C=GR O=Hellenic Academic and Research Institutions CA CN=GEANT TLS RSA 1
Valid from
2026-07-23T05:45:56+00:00
Expires
2027-02-07T05:45:55+00:00
Days remaining
101
Serial (hex)
56AD687DDB5C02DD857B040EA3DAC013
Signature
RSA-SHA256
Public key
RSA 3072

Subject alternative names (SAN)

DNS:mx.biaman.pl, DNS:www.mx.biaman.pl

SHA-256 fingerprint

EF:CB:05:5E:56:DB:0A:0A:AB:CE:FC:F1:7A:FB:86:87:52:D7:9E:42:28:E4:14:38:C6:54:1E:38:87:4B:2B:90
Certificate extensions & PEM
basicConstraints
CA:FALSE
authorityKeyIdentifier
86:01:72:3F:8C:A9:70:E2:31:06:53:16:CE:01:5F:5B:79:C8:3C:3B
authorityInfoAccess
CA Issuers - URI:http://crt.harica.gr/HARICA-GEANT-TLS-R1.cer
subjectAltName
DNS:mx.biaman.pl, DNS:www.mx.biaman.pl
certificatePolicies
Policy: 2.23.140.1.2.2 Policy: 0.4.0.2042.1.7 Policy: 1.3.6.1.4.1.26513.1.1.1.2
extendedKeyUsage
TLS Web Client Authentication, TLS Web Server Authentication
crlDistributionPoints
Full Name: URI:http://crl.harica.gr/HARICA-GEANT-TLS-R1.crl
subjectKeyIdentifier
9F:34:9A:25:B7:D5:B6:C8:E8:CE:9A:75:F7:ED:4D:7E:43:2A:BC:F0
keyUsage
Digital Signature, Key Encipherment
ct_precert_scts
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 : Jul 23 05:55:58.220 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:D8:3E:14:FC:26:5A:07:82:C7:51:A6: DD:36:B1:81:7F:3C:AE:4E:3A:F9:98:D4:C3:54:18:60: E4:F3:66:D6:1D:02:20:37:75:F8:B7:7C:64:80:FB:08: F6:6F:33:C6:23:E1:B0:DD:94:C6:33:DA:A4:B2:8F:7F: DF:B9:EE:B7:D2:28:0E Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 46:A2:39:67:C6:0D:B6:46:87:C6:6F:3D:F9:99:94:76: 93:A6:A6:11:20:84:57:D5:55:E7:E3:D0:A1:D9:B6:46 Timestamp : Jul 23 05:55:58.251 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:1E:8B:44:1C:36:E2:6F:18:CA:42:95:A7: 7B:A0:B3:51:16:59:44:FE:8A:0E:2D:57:2E:28:B3:A4: 1C:8F:92:97:02:21:00:DA:EA:A8:BD:00:40:5A:20:E0: 85:78:25:BB:26:7A:29:10:4C:2B:A5:16:F2:27:C2:FF: 99:AD:B5:0F:91:C9:76 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 : Jul 23 05:55:58.196 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:81:0E:41:BB:0C:3F:DD:42:9E:E5:50: E5:1C:11:9B:93:E9:9D:0F:12:1C:9B:64:1D:51:11:38: B1:53:8B:D1:E7:02:20:5B:95:B1:C5:03:B3:8F:B7:30: 9E:A7:25:55:4B:68:2F:EA:9A:72:10:7B:45:C7:8D:4E: BA:7E:FA:4F:39:DD:4B
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-10-28T12:38:09+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=GR O=Hellenic Academic and Research Institutions CA CN=GEANT TLS RSA 1
Issuer
C=GR O=Hellenic Academic and Research Institutions CA CN=HARICA TLS RSA Root CA 2021
Valid from
2025-01-03T11:15:00+00:00
Expires
2039-12-31T11:14:59+00:00
Days remaining
4811
Serial (hex)
14D57BF3692228219A5567FA91651B22
Signature
RSA-SHA256
Public key
RSA 3072

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

5B:67:8D:C4:40:95:A5:28:95:B6:3B:31:F2:72:27:F4:B3:6C:3E:34:74:91:BF:2B:FA:69:18:37:A5:FB:8C:79
Certificate extensions & PEM
basicConstraints
CA:TRUE, pathlen:0
authorityKeyIdentifier
0A:48:23:A6:60:A4:92:0A:33:EA:93:5B:C5:57:EA:25:4D:BD:12:EE
authorityInfoAccess
CA Issuers - URI:http://crt.harica.gr/HARICA-TLS-Root-2021-RSA.cer
certificatePolicies
Policy: X509v3 Any Policy
extendedKeyUsage
TLS Web Client Authentication, TLS Web Server Authentication
crlDistributionPoints
Full Name: URI:http://crl.harica.gr/HARICA-TLS-Root-2021-RSA.crl
subjectKeyIdentifier
86:01:72:3F:8C:A9:70:E2:31:06:53:16:CE:01:5F:5B:79:C8:3C:3B
keyUsage
Digital Signature, Certificate Sign, CRL Sign
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Chain certificate 2

Subject
C=GR O=Hellenic Academic and Research Institutions CA CN=HARICA TLS RSA Root CA 2021
Issuer
C=GR L=Athens O=Hellenic Academic and Research Institutions Cert. Authority CN=Hellenic Academic and Research Institutions RootCA 2015
Valid from
2021-09-02T07:41:55+00:00
Expires
2029-08-31T07:41:54+00:00
Days remaining
1037
Serial (hex)
2A6086D4D4DE45C95E4B98FBBF2FBF26
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

4A:CD:8D:C6:02:0A:54:5A:85:89:43:A5:53:B5:E0:F3:FC:5B:85:9A:EA:17:46:65:0D:69:CF:12:10:F9:56:D8
Certificate extensions & PEM
basicConstraints
CA:TRUE
authorityKeyIdentifier
71:15:67:C8:C8:C9:BD:75:5D:72:D0:38:18:6A:9D:F3:71:24:54:0B
authorityInfoAccess
CA Issuers - URI:http://repo.harica.gr/certs/HaricaRootCA2015.crt
certificatePolicies
Policy: X509v3 Any Policy
extendedKeyUsage
TLS Web Client Authentication, TLS Web Server Authentication
crlDistributionPoints
Full Name: URI:http://crl.harica.gr/HaricaRootCA2015.crl
subjectKeyIdentifier
0A:48:23:A6:60:A4:92:0A:33:EA:93:5B:C5:57:EA:25:4D:BD:12:EE
keyUsage
Digital Signature, Certificate Sign, CRL Sign
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

One endpoint on port 443. Server-presented chain; no revocation, OCSP, CT or full TLS security scan.

View certificate JSON

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