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

kielnet.de · 212.7.147.128:443

Unverified

Certificate verification failed. These are unverified certificate details presented by the server. SSL operation failed with code 1. OpenSSL Error messages: error:0A000086:SSL routines::certificate verify failed

Certificate verification failed

Subject: C=US O=Unspecified CN=wwwredvm01hw.versatel.local emailAddress=root@wwwredvm01hw.versatel.local
Issuer: C=US O=Unspecified OU=ca-725446088658363507 CN=wwwredvm01hw.versatel.local emailAddress=root@wwwredvm01hw.versatel.local
Valid from: 2026-07-31T08:31:07+00:00
Expires: 2027-07-31T08:31:07+00:00
Days remaining: 276
Serial (hex): 1951312397045B83
Signature: RSA-SHA256
Public key: RSA 2048

Subject alternative names (SAN)

DNS:wwwredvm01hw.versatel.local

SHA-256 fingerprint

37:26:91:E0:24:79:01:F6:0C:75:72:EE:8D:3E:5B:18:2C:FA:DE:3B:AE:16:F2:BA:E5:89:6C:1E:7A:93:C5:76

Certificate extensions & PEM

keyUsage: Digital Signature, Key Encipherment
extendedKeyUsage: TLS Web Server Authentication
basicConstraints: CA:FALSE
subjectAltName: DNS:wwwredvm01hw.versatel.local
authorityKeyIdentifier: 4D:1C:0C:13:D3:F8:DF:1C:3F:9A:19:49:03:FC:20:84:1B:8B:0F:FD

-----BEGIN CERTIFICATE-----
MIIFEjCCAvqgAwIBAgIIGVExI5cEW4MwDQYJKoZIhvcNAQELBQAwgZoxCzAJBgNV
BAYTAlVTMRQwEgYDVQQKDAtVbnNwZWNpZmllZDEeMBwGA1UECwwVY2EtNzI1NDQ2
MDg4NjU4MzYzNTA3MSQwIgYDVQQDDBt3d3dyZWR2bTAxaHcudmVyc2F0ZWwubG9j
YWwxLzAtBgkqhkiG9w0BCQEWIHJvb3RAd3d3cmVkdm0wMWh3LnZlcnNhdGVsLmxv
Y2FsMB4XDTI2MDczMTA4MzEwN1oXDTI3MDczMTA4MzEwN1owejELMAkGA1UEBhMC
VVMxFDASBgNVBAoMC1Vuc3BlY2lmaWVkMSQwIgYDVQQDDBt3d3dyZWR2bTAxaHcu
dmVyc2F0ZWwubG9jYWwxLzAtBgkqhkiG9w0BCQEWIHJvb3RAd3d3cmVkdm0wMWh3
LnZlcnNhdGVsLmxvY2FsMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA
uciOEeJeqzEswx0rXDFsSib8rxtN69tvV4Xh8Xb2XTXG1RssRvC3RQglfFOloslF
dCNHLhyN8U/NhMS5ym/fIgaHWAYhNrDAG9GzB0mKJ9V/iUJqtZqdl3qCPimVF9Xf
aeFoK5KCK+8QYwpz1xCk2VoEPbDeRUD0ENSTVnTAARr2xDR2j5B9/8g9fWPznK7q
mAtFtRXG035tv3qGgQk2fqdw9HgAD49ZqF7VJ2/nSgO9kyReNbOjmxM4ZB1HXpDl
fjX3o1aGdhohOcoscL5BPEA2uAT3fDx41j6NPkTB82jqtWCW15RlUBc3MAdIyMuK
XBCTasJGNRQLC9sraRBN+wIDAQABo3sweTAOBgNVHQ8BAf8EBAMCBaAwEwYDVR0l
BAwwCgYIKwYBBQUHAwEwCQYDVR0TBAIwADAmBgNVHREEHzAdght3d3dyZWR2bTAx
aHcudmVyc2F0ZWwubG9jYWwwHwYDVR0jBBgwFoAUTRwME9P43xw/mhlJA/wghBuL
D/0wDQYJKoZIhvcNAQELBQADggIBAAMW/KkUox4uhcd1fnpxPEkKAqC4eOVskMEM
heHl9wfxqfisdek94hsvPsSD/Fe4FR7QoCF2geQ0wtYvW4OmfeichBeYVBO7AuCY
251++MlH64UBX3rqD9eFUE/QXxMVKu1S1T17S02L/1hl1/h67D+Nu7VHBwKI6aiS
cwt8Q9hWz1zgPnAYCGVbadKbV6+QjFJXATgglYQX7Us6koZCHo11rmrNJvm1rOf9
GbYfo9RhgA6qP/wv/YFMU6U07xgAxIoQsmrPPCHGSLq5+hPU95zp6G7eAf+C4EFs
zkCpTq4PFnxcxOE2LYv60yTE+qoTXRoAx02Ihi04dntOJmV2nL/+Vydz9LjEpXD3
iRYpPFbeEP2M4yZxB328RzV2ZWIE+aUuZbjxZ3I0QIHJ0Vv0l+lyrk2U/7oE4Zw6
Rceq20sRijd65kYfSXS8AmbgYJ/Whj538wE6r/YRloFidRhTD392MEVxL28aWMap
hC/CwLq9n9Qj6lqF/0iKRBniJ7kdsV4LyamWXYb7Yo+cM0X4EstjLNidoa+D2Jt5
AKmNYi2aWi3myxM220IIqu54Nns/T0NyuTsgxFYVL3SbnDUCdRa/eW96GdYRQngk
rbszl8KzxClcgEcV3AlnlBMxdo7qy9LfO9I+FgRiFpDijPpmiITF4Rk7nT9+Px3A
YECVXY0O
-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-10-27T09:57:31+00:00

Server-presented chain · 1 additional certificate

Chain certificate 1

Subject: C=US O=Unspecified OU=ca-725446088658363507 CN=wwwredvm01hw.versatel.local emailAddress=root@wwwredvm01hw.versatel.local
Issuer: C=US O=Unspecified OU=ca-725446088658363507 CN=wwwredvm01hw.versatel.local emailAddress=root@wwwredvm01hw.versatel.local
Valid from: 2026-07-31T08:31:07+00:00
Expires: 2027-07-31T08:31:07+00:00
Days remaining: 276
Serial (hex): 0A114D5FC22DA473
Signature: RSA-SHA256
Public key: RSA 4096

Subject alternative names (SAN)

DNS:wwwredvm01hw.versatel.local

SHA-256 fingerprint

E6:D3:BF:68:1D:76:8D:2B:EE:35:2B:B7:45:DE:40:E7:48:D7:B3:13:1A:43:43:76:76:80:11:70:24:04:F6:6A

Certificate extensions & PEM

keyUsage: Digital Signature, Key Encipherment, Certificate Sign
basicConstraints: CA:TRUE
nameConstraints: Permitted: DNS:wwwredvm01hw.versatel.local
subjectAltName: DNS:wwwredvm01hw.versatel.local
subjectKeyIdentifier: 4D:1C:0C:13:D3:F8:DF:1C:3F:9A:19:49:03:FC:20:84:1B:8B:0F:FD

-----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

Registration / WHOIS →DNS records →