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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

uss.com · 170.191.2.22:443

Verified

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

Subject
C=US ST=Pennsylvania L=Pittsburgh O=UNITED STATES STEEL CORPORATION CN=www.ussteel.com
Issuer
C=US O=DigiCert Inc CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1
Valid from
2025-12-31T00:00:00+00:00
Expires
2027-01-13T23:59:59+00:00
Days remaining
75
Serial (hex)
0D2C63A79FE0D052C61B3D6947CCC810
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:www.ussteel.com, DNS:uss.com, DNS:ussteel.com, DNS:www.uss.com

SHA-256 fingerprint

7D:0D:C1:89:5C:34:DC:4E:8A:4B:F7:40:6C:61:36:0A:E7:1C:15:53:CD:C5:5F:33:E6:FF:B9:08:EF:D6:82:FC
Certificate extensions & PEM
authorityKeyIdentifier
74:85:80:C0:66:C7:DF:37:DE:CF:BD:29:37:AA:03:1D:BE:ED:CD:17
subjectKeyIdentifier
4A:13:F8:F4:6D:EC:07:46:33:95:B1:E0:92:88:CF:53:11:18:B2:D4
subjectAltName
DNS:www.ussteel.com, DNS:uss.com, DNS:ussteel.com, DNS:www.uss.com
certificatePolicies
Policy: 2.23.140.1.2.2 CPS: http://www.digicert.com/CPS
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
crlDistributionPoints
Full Name: URI:http://crl3.digicert.com/DigiCertGlobalG2TLSRSASHA2562020CA1-1.crl Full Name: URI:http://crl4.digicert.com/DigiCertGlobalG2TLSRSASHA2562020CA1-1.crl
authorityInfoAccess
OCSP - URI:http://ocsp.digicert.com CA Issuers - URI:http://cacerts.digicert.com/DigiCertGlobalG2TLSRSASHA2562020CA1-1.crt
basicConstraints
CA:FALSE
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 4C:63:DC:98:E5:9C:1D:AB:88:F6:1E:8A:3D:DE:AE:8F: AB:44:A3:37:7B:5F:9B:94:C3:FB:A1:9C:FC:C1:BE:26 Timestamp : Dec 31 13:31:49.453 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:B6:D8:70:A4:50:68:29:0D:78:91:64: F9:49:9B:74:0F:D1:E4:52:CB:05:CE:25:8F:63:55:E7: 62:71:C2:31:D9:02:20:41:1A:AA:BF:0A:33:F3:C5:0A: F6:8B:6E:52:2E:46:6E:D3:4A:10:84:7C:E0:FE:C5:88: A0:84:F3:FC:7D:DD:93 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 1C:9F:68:2C:E9:FA:F0:45:69:50:F8:1B:96:8A:87:DD: DB:32:10:D8:4C:E6:C8:B2:E3:82:52:4A:C4:CF:59:9F Timestamp : Dec 31 13:31:49.503 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:AC:A0:82:65:BA:84:FD:35:F0:A3:4F: AF:35:99:BB:70:ED:6C:A6:7D:65:64:89:A5:0F:8B:0D: 7F:73:56:FB:8C:02:21:00:B6:4C:DE:21:56:9B:AD:2F: 73:7D:7C:DE:E6:08:F1:AF:FC:71:70:73:86:1E:B6:5B: EB:0F:03:1F:5D:2A:D9:5F Signed Certificate Timestamp: Version : v1 (0x0) Log ID : A2:81:00:18:73:4E:17:6E:1D:47:E0:95:40:F3:81:BA: 54:66:97:CD:63:A8:43:50:71:6E:B8:09:4E:DA:F1:0D Timestamp : Dec 31 13:31:49.550 2025 GMT Extensions: 00:00:05:00:00:E9:2E:52 Signature : ecdsa-with-SHA256 30:45:02:21:00:DA:43:28:03:5D:46:6B:9F:18:91:ED: AB:03:63:BB:4E:AC:07:98:72:54:68:32:77:44:6B:D1: 80:93:2D:2D:3D:02:20:3C:D8:41:47:C3:16:DC:87:65: C4:B4:10:9D:D2:E3:B4:BB:83:52:28:84:03:9B:F1:33: 5E:EB:90:A2:08:BE:2D
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-10-30T09:47:44+00:00

Server-presented chain · 1 additional certificate

Chain certificate 1

Subject
C=US O=DigiCert Inc CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1
Issuer
C=US O=DigiCert Inc OU=www.digicert.com CN=DigiCert Global Root G2
Valid from
2021-03-30T00:00:00+00:00
Expires
2031-03-29T23:59:59+00:00
Days remaining
1611
Serial (hex)
0CF5BD062B5602F47AB8502C23CCF066
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

C8:02:5F:9F:C6:5F:DF:C9:5B:3C:A8:CC:78:67:B9:A5:87:B5:27:79:73:95:79:17:46:3F:C8:13:D0:B6:25:A9
Certificate extensions & PEM
basicConstraints
CA:TRUE, pathlen:0
subjectKeyIdentifier
74:85:80:C0:66:C7:DF:37:DE:CF:BD:29:37:AA:03:1D:BE:ED:CD:17
authorityKeyIdentifier
4E:22:54:20:18:95:E6:E3:6E:E6:0F:FA:FA:B9:12:ED:06:17:8F:39
keyUsage
Digital Signature, Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
authorityInfoAccess
OCSP - URI:http://ocsp.digicert.com CA Issuers - URI:http://cacerts.digicert.com/DigiCertGlobalRootG2.crt
crlDistributionPoints
Full Name: URI:http://crl3.digicert.com/DigiCertGlobalRootG2.crl
certificatePolicies
Policy: 2.16.840.1.114412.2.1 Policy: 2.23.140.1.1 Policy: 2.23.140.1.2.1 Policy: 2.23.140.1.2.2 Policy: 2.23.140.1.2.3
-----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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