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

TLSv1.2

t-systems.de · 63.181.161.172:443

Verified

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

Subject
C=DE ST=Nordrhein-Westfalen L=Bonn O=Deutsche Telekom IT GmbH CN=t-systems.de
Issuer
C=DE O=Deutsche Telekom Security GmbH CN=Telekom Security ServerID OV Class 2 CA
Valid from
2026-02-16T07:26:47+00:00
Expires
2027-02-20T23:59:59+00:00
Days remaining
99
Serial (hex)
31969FA05171B5AA818F893DDC653EAE
Signature
RSA-SHA256
Public key
EC 256 prime256v1

Subject alternative names (SAN)

DNS:t-systems.de, DNS:www.t-systems.de

SHA-256 fingerprint

C3:E6:98:0E:8C:5F:DF:8C:4D:49:1C:30:C2:57:D5:3B:66:28:1A:6E:85:E1:8B:23:96:84:E3:55:89:ED:D2:4F
Certificate extensions & PEM
authorityKeyIdentifier
1C:05:93:B1:7F:A8:34:30:8C:52:E0:96:40:A0:72:A3:10:5D:E0:FF
keyUsage
Digital Signature, Key Agreement
extendedKeyUsage
TLS Web Client Authentication, TLS Web Server Authentication
subjectKeyIdentifier
1C:E8:D9:44:3F:61:2D:42:6A:6D:1A:1B:20:7B:B0:AC:35:80:43:74
certificatePolicies
Policy: 2.23.140.1.2.2 CPS: http://docs.serverid.telesec.de/cps/serverid.htm
crlDistributionPoints
Full Name: URI:http://crl.serverid.telesec.de/rl/Telekom_Security_ServerID_OV_Class_2_CA.crl
authorityInfoAccess
OCSP - URI:http://ocsp.serverid.telesec.de/ocspr CA Issuers - URI:http://crt.serverid.telesec.de/crt/Telekom_Security_ServerID_OV_Class_2_CA.crt
basicConstraints
CA:FALSE
subjectAltName
DNS:t-systems.de, DNS:www.t-systems.de
ct_precert_scts
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 : Feb 16 07:26:50.551 2026 GMT Extensions: 00:00:05:00:02:8A:2A:70 Signature : ecdsa-with-SHA256 30:46:02:21:00:F3:E8:02:4F:9F:44:3D:B0:BC:F0:7D: 3F:FD:8D:9F:73:9D:00:9F:4B:C8:EF:78:57:DC:93:5F: 8A:F2:C7:A9:FF:02:21:00:8D:1B:59:E8:E2:1D:C0:04: 45:43:85:A7:EF:4F:44:B9:DC:C1:D4:2C:34:51:8F:4E: D2:3A:18:0A:24:C7:5A:CF 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 : Feb 16 07:26:49.542 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:5D:BD:B7:9A:F1:76:CA:B0:D3:0C:41:E3: 1F:97:76:78:2B:99:61:87:22:CD:C0:A0:52:C1:FA:D1: BD:00:E0:8D:02:21:00:E3:4C:D9:0B:CE:10:0F:C3:B0: 4E:B2:8B:93:3A:74:BE:A9:F7:C7:C0:59:05:16:47:1C: 62:BE:53:E0:4F:DF:CC Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 8E:CA:47:0B:AC:DE:6A:F3:A2:06:B0:A4:7A:84:B7:46: FE:1F:C6:BF:95:3E:25:E6:9B:4E:E4:02:48:F3:C6:E8 Timestamp : Feb 16 07:26:49.774 2026 GMT Extensions: 00:00:05:00:02:C4:FB:1B Signature : ecdsa-with-SHA256 30:46:02:21:00:D2:76:E0:9D:C8:31:90:F4:6A:54:B5: 87:A5:C4:AB:A6:86:62:94:30:8D:91:C1:39:E2:30:8F: C1:9E:E0:30:C4:02:21:00:9A:54:56:22:83:52:82:B1: 1A:76:7F:AF:03:88:E2:4E:59:26:1A:94:A9:AF:8B:6B: 65:22:42:18:98:EB:C4:B4 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 59:6E:6C:33:86:94:B2:59:72:A2:56:C8:A0:E8:DD:90: 4A:76:E8:08:3D:DA:87:3B:01:08:38:28:14:3C:EE:59 Timestamp : Feb 16 07:26:49.433 2026 GMT Extensions: 00:00:05:00:00:28:19:4E Signature : ecdsa-with-SHA256 30:45:02:21:00:A9:5A:7F:AF:F3:52:06:C9:F2:E2:94: 31:C7:16:6A:94:41:48:6D:AF:67:43:6F:E6:1D:A7:3B: E1:55:2E:86:E0:02:20:4C:07:16:62:69:2F:E7:25:19: 94:92:BE:BA:17:8F:86:C0:4C:AA:B8:C5:F7:C2:77:47: DF:4E:6F:FE:64:4C:E9 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 : Feb 16 07:26:49.432 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:12:B4:FC:44:AF:A7:81:7D:E6:E5:BD:B8: EA:6B:F6:5E:FB:05:4C:A0:06:F4:47:6F:21:E6:16:02: 24:FC:16:BF:02:20:5F:03:B7:1E:51:20:AB:CE:95:AF: F3:0D:D9:6D:19:9A:23:7A:7E:40:8B:A1:DE:5F:26:A4: 74:DF:CE:9A:41:59
-----BEGIN CERTIFICATE-----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=
-----END CERTIFICATE-----

Cipher: ECDHE-ECDSA-AES128-GCM-SHA256 · Checked 2026-11-13T21:28:57+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=DE O=Deutsche Telekom Security GmbH CN=Telekom Security ServerID OV Class 2 CA
Issuer
C=DE O=T-Systems Enterprise Services GmbH OU=T-Systems Trust Center CN=T-TeleSec GlobalRoot Class 2
Valid from
2022-08-02T09:16:44+00:00
Expires
2027-08-02T23:59:59+00:00
Days remaining
262
Serial (hex)
0E5D298915C40431A4E1C4CA488B8EA3
Signature
RSA-SHA256
Public key
RSA 3072

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

94:4A:CE:96:1D:B3:16:BE:B6:94:E0:1C:30:2C:46:FE:D4:0D:C0:29:17:29:E7:DA:F5:85:50:C3:CB:55:E7:91
Certificate extensions & PEM
keyUsage
Certificate Sign, CRL Sign
subjectKeyIdentifier
1C:05:93:B1:7F:A8:34:30:8C:52:E0:96:40:A0:72:A3:10:5D:E0:FF
authorityKeyIdentifier
BF:59:20:36:00:79:A0:A0:22:6B:8C:D5:F2:61:D2:B8:2C:CB:82:4A
basicConstraints
CA:TRUE, pathlen:0
extendedKeyUsage
TLS Web Client Authentication, TLS Web Server Authentication
crlDistributionPoints
Full Name: URI:http://grcl2.crl.telesec.de/rl/T-TeleSec_GlobalRoot_Class_2.crl
authorityInfoAccess
OCSP - URI:http://grcl2.ocsp.telesec.de/ocspr CA Issuers - URI:http://grcl2.crt.telesec.de/crt/T-TeleSec_GlobalRoot_Class_2.crt
certificatePolicies
Policy: 2.23.140.1.2.2
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Chain certificate 2

Subject
C=DE O=T-Systems Enterprise Services GmbH OU=T-Systems Trust Center CN=T-TeleSec GlobalRoot Class 2
Issuer
C=DE O=T-Systems Enterprise Services GmbH OU=T-Systems Trust Center CN=T-TeleSec GlobalRoot Class 2
Valid from
2008-10-01T10:40:14+00:00
Expires
2033-10-01T23:59:59+00:00
Days remaining
2514
Serial (hex)
01
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

91:E2:F5:78:8D:58:10:EB:A7:BA:58:73:7D:E1:54:8A:8E:CA:CD:01:45:98:BC:0B:14:3E:04:1B:17:05:25:52
Certificate extensions & PEM
basicConstraints
CA:TRUE
keyUsage
Certificate Sign, CRL Sign
subjectKeyIdentifier
BF:59:20:36:00:79:A0:A0:22:6B:8C:D5:F2:61:D2:B8:2C:CB:82:4A
-----BEGIN CERTIFICATE-----
MIIDwzCCAqugAwIBAgIBATANBgkqhkiG9w0BAQsFADCBgjELMAkGA1UEBhMCREUx
KzApBgNVBAoMIlQtU3lzdGVtcyBFbnRlcnByaXNlIFNlcnZpY2VzIEdtYkgxHzAd
BgNVBAsMFlQtU3lzdGVtcyBUcnVzdCBDZW50ZXIxJTAjBgNVBAMMHFQtVGVsZVNl
YyBHbG9iYWxSb290IENsYXNzIDIwHhcNMDgxMDAxMTA0MDE0WhcNMzMxMDAxMjM1
OTU5WjCBgjELMAkGA1UEBhMCREUxKzApBgNVBAoMIlQtU3lzdGVtcyBFbnRlcnBy
aXNlIFNlcnZpY2VzIEdtYkgxHzAdBgNVBAsMFlQtU3lzdGVtcyBUcnVzdCBDZW50
ZXIxJTAjBgNVBAMMHFQtVGVsZVNlYyBHbG9iYWxSb290IENsYXNzIDIwggEiMA0G
CSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCqX9obX+hzkeXaXPSi5kfl82hVYAUd
AqSzm1nzHoqvNK38DcLZSBnuaY/JIPwhqgcZ7bBcrGXHX+0CfHt8LRvWurmAwhiC
FoT6ZrAIxlQjgeTNuUk/9k9uN0goOA/FvudocP05l03Sx5iRUKrERLMjfTlH6VJi
1hKTXrcxlkIF+3anHqP1wvzpesVsqXFP6st4vGCvx9702cu+fjOlbpSD8DT6Iavq
jnKgP6TeMFvvhk1qlVtDRKgQFRzlAVfFmPHmBiiRqiDFt1MmUUOyCxGVWOHAD3bZ
wI18gfNycJ5v/hqO2V81xrJvNHy+SE/iWjnX2J14np+GPgNeGYtEotXHAgMBAAGj
QjBAMA8GA1UdEwEB/wQFMAMBAf8wDgYDVR0PAQH/BAQDAgEGMB0GA1UdDgQWBBS/
WSA2AHmgoCJrjNXyYdK4LMuCSjANBgkqhkiG9w0BAQsFAAOCAQEAMQOiYQsfdOhy
NsZt+U2e+iKo4YFWz827n+qrkRk4r6p8FU3ztqONpfSO9kSpp+ghla0+AGIWiPAC
uvxhI+YzmzB6azZie60EI4RYZeLbK4rnJVM3YlNfvNoBYimipidx5joifsFvHZVw
IEoHNN/q/xWA5brXethbdXwFeilHfkCoMRN3zUA7tFFHei4R40cR3p1m0IvVVGb6
g1XqfMIpiRvpb7PO4gWEyS8+eIVibslfwXhjdFjASBgMmTnrpMwatXlajRWc2BQN
9noHV8cigwUtPJslJj0Ys6lDfMjIq2SPDqO/nBudMNva0Bkuqjzx+zOAduTNrRlP
BSeOE6Fuwg==
-----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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