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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

TLSv1.2

omc-mail.de · 212.77.232.72:443

Verified

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

Subject
CN=www.omc-mail.de
Issuer
C=US O=Let's Encrypt CN=YR1
Valid from
2026-08-28T08:13:12+00:00
Expires
2026-11-26T08:13:11+00:00
Days remaining
50
Serial (hex)
06B9CA91A6975038BC1CF7B02A8816E0A688
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:omc-mail.de, DNS:www.omc-mail.de

SHA-256 fingerprint

D8:F6:24:74:0E:7E:E9:5E:FF:6A:D2:52:2A:86:CD:03:1F:7D:2A:DE:EF:C1:C9:A7:FD:11:0E:F5:CE:55:27:FB
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
1F:F8:D8:BF:DD:83:18:60:EE:57:F2:40:C1:A1:EC:4E:47:6F:E4:53
authorityKeyIdentifier
1F:2F:35:BE:46:14:82:CD:40:B1:AE:79:2C:55:78:FA:F7:D4:68:FB
authorityInfoAccess
CA Issuers - URI:http://yr1.i.lencr.org/
subjectAltName
DNS:omc-mail.de, DNS:www.omc-mail.de
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr1.c.lencr.org/9.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : C8:A3:C4:7F:C7:B3:AD:B9:35:6B:01:3F:6A:7A:12:6D: E3:3A:4E:43:A5:C6:46:F9:97:AD:39:75:99:1D:CF:9A Timestamp : Aug 28 09:11:42.844 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:A8:DE:CE:BF:83:F3:96:6D:FB:89:A7: DE:A4:CD:01:C1:15:64:76:2E:82:CC:04:19:EE:D9:63: DC:9A:CB:97:12:02:21:00:89:DD:8C:3A:4C:37:BC:49: FE:3C:6E:E9:A5:F1:C9:85:B2:27:CB:80:D6:B8:16:02: AA:1C:88:79:84:FF:F3:1F Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 1A:8B:9D:6B:0F:FE:BF:81:B4:79:39:C6:D2:31:0A:86: D6:D1:02:D4:F0:46:E2:18:2C:9D:E3:5F:5E:26:25:EF Timestamp : Aug 28 09:11:43.363 2026 GMT Extensions: 00:00:05:00:39:AA:C4:C4 Signature : ecdsa-with-SHA256 30:44:02:20:1D:CB:64:91:7A:13:E6:3D:48:56:FE:28: C6:2F:C4:C3:64:EA:EB:35:76:A5:68:61:56:54:A0:8B: 67:16:6E:8F:02:20:6C:BC:6F:E2:95:27:F6:0E:B9:57: 11:6C:A1:19:5F:AE:3F:9E:DA:E7:EE:FB:3F:19:97:A8: E2:D0:6A:14:42:9D
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: ECDHE-RSA-AES256-GCM-SHA384 · Checked 2026-10-07T03:21:38+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=US O=Let's Encrypt CN=YR1
Issuer
C=US O=ISRG CN=Root YR
Valid from
2025-09-03T00:00:00+00:00
Expires
2028-09-02T23:59:59+00:00
Days remaining
696
Serial (hex)
A20253F15F2691C05DC1CE13B9BCCA4E
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

13:94:96:34:D9:9C:D6:FD:6A:A8:0B:C0:34:FE:FA:CC:EB:19:69:FE:EF:98:65:86:71:3E:CD:BB:05:75:8D:3F
Certificate extensions & PEM
keyUsage
Digital Signature, Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:TRUE, pathlen:0
subjectKeyIdentifier
1F:2F:35:BE:46:14:82:CD:40:B1:AE:79:2C:55:78:FA:F7:D4:68:FB
authorityKeyIdentifier
DE:E7:5B:60:D0:22:6D:40:28:7D:3F:0D:01:FE:A4:B5:52:B4:51:94
authorityInfoAccess
CA Issuers - URI:http://yr.i.lencr.org/
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr.c.lencr.org/ 
-----BEGIN CERTIFICATE-----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=
-----END CERTIFICATE-----

Chain certificate 2

Subject
C=US O=ISRG CN=Root YR
Issuer
C=US O=Internet Security Research Group CN=ISRG Root X1
Valid from
2026-05-13T00:00:00+00:00
Expires
2032-09-02T23:59:59+00:00
Days remaining
2157
Serial (hex)
F24B6D17F9D9AD7CB1C9FEA78782699F
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

07:26:39:D0:B1:40:D5:BF:FA:E1:6A:D9:C3:F6:CC:60:86:04:06:21:F5:1E:E6:1A:6D:46:A8:91:5C:07:CF:76
Certificate extensions & PEM
keyUsage
Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:TRUE
subjectKeyIdentifier
DE:E7:5B:60:D0:22:6D:40:28:7D:3F:0D:01:FE:A4:B5:52:B4:51:94
authorityKeyIdentifier
79:B4:59:E6:7B:B6:E5:E4:01:73:80:08:88:C8:1A:58:F6:E9:9B:6E
authorityInfoAccess
CA Issuers - URI:http://x1.i.lencr.org/
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://x1.c.lencr.org/ 
-----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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