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

up.pt · 193.137.55.13:443

Verified

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

Subject
C=PT L=Porto O=Universidade do Porto CN=up.pt
Issuer
C=GR O=Hellenic Academic and Research Institutions CA CN=GEANT TLS RSA 1
Valid from
2025-11-20T06:34:01+00:00
Expires
2026-11-20T06:34:01+00:00
Days remaining
48
Serial (hex)
0637A90FB7D3C659ED8D683C02DA327C
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:up.pt, DNS:www.up.pt

SHA-256 fingerprint

45:52:2E:77:28:8C:F0:B7:E3:AF:C3:A4:9B:F1:E7:7F:6C:4A:5C:33:69:93:90:DE:E9:99:BC:DE:FC:AC:D8:89
Certificate extensions & PEM
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 OCSP - URI:http://ocsp-tls.harica.gr
subjectAltName
DNS:up.pt, DNS:www.up.pt
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
C5:DD:44:7E:32:57:4E:81:FE:5C:51:BF:40:C0:C4:17:8E:11:28:7E
keyUsage
Digital Signature, Key Encipherment
ct_precert_scts
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 : Nov 20 06:44:03.222 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:F3:66:9E:6E:90:40:EB:C6:DF:12:48: 97:1A:C6:44:92:77:BD:46:64:09:7B:01:AC:A7:41:EB: 70:2D:F2:8A:D7:02:21:00:C8:CA:B2:1B:47:4A:A6:0F: 21:9E:28:AA:15:F1:02:18:FD:81:09:D7:A4:7E:FA:BE: 97:81:19:AD:AF:25:91:92 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 : Nov 20 06:44:03.173 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:97:DA:B0:8E:36:E0:77:71:B8:A5:84: 4C:AB:6D:78:72:43:43:05:05:38:FD:79:DE:69:7D:37: 1C:85:F4:D5:23:02:21:00:BF:E6:E8:58:D4:DC:92:D3: EC:4D:A4:4E:F3:17:4F:A7:DA:D5:12:7C:B2:F1:9C:A0: 1D:EC:4A:D3:0F:DC:59:AB Signed Certificate Timestamp: Version : v1 (0x0) Log ID : AC:AB:30:70:6C:EB:EC:84:31:F4:13:D2:F4:91:5F:11: 1E:42:24:43:B1:F2:A6:8C:4F:3C:2B:3B:A7:1E:02:C3 Timestamp : Nov 20 06:44:03.224 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:10:51:C7:76:AE:9A:ED:88:F2:FB:96:C3: BC:C1:4C:25:55:55:99:59:9A:1D:C1:45:DF:DE:18:18: D0:21:95:9F:02:20:02:13:01:82:3C:D4:EF:91:35:25: 07:B0:60:81:59:27:2B:94:54:C3:E1:F3:25:5B:3D:7B: 44:F0:4B:FD:F9:98
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-10-02T22:31:56+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
4837
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
1063
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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