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

mail.keyweb.de · 95.169.160.15:443

Verified

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

Subject
CN=mail.keyweb.de
Issuer
C=US O=Let's Encrypt CN=YR1
Valid from
2026-08-25T06:16:44+00:00
Expires
2026-11-23T06:16:43+00:00
Days remaining
53
Serial (hex)
06B0DC27436215C824A5D3BA5237540AAC2D
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:autoconfig.keyweb.de, DNS:autodiscover.keyweb.de, DNS:mail.keymachine.de, DNS:mail.keymachine.eu, DNS:mail.keymedia.tv, DNS:mail.keyweb.de, DNS:mail.keyweb.org

SHA-256 fingerprint

03:1C:78:8B:FB:BB:92:AC:20:2E:67:8C:D5:26:ED:1C:83:51:15:5D:54:5B:94:95:49:3C:6D:C8:A7:13:14:69
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
32:6F:76:ED:D0:33:98:B6:C8:D8:DE:F1:32:F2:80:4A:A9:D2:E1:A1
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:autoconfig.keyweb.de, DNS:autodiscover.keyweb.de, DNS:mail.keymachine.de, DNS:mail.keymachine.eu, DNS:mail.keymedia.tv, DNS:mail.keyweb.de, DNS:mail.keyweb.org
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr1.c.lencr.org/46.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : CB:38:F7:15:89:7C:84:A1:44:5F:5B:C1:DD:FB:C9:6E: F2:9A:59:CD:47:0A:69:05:85:B0:CB:14:C3:14:58:E7 Timestamp : Aug 25 07:15:15.036 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:82:F5:73:85:AA:8D:58:36:B8:AE:AF: F6:5E:4A:ED:9C:78:8D:5E:EE:AE:DF:BE:9F:2F:FB:D9: 07:7D:8E:5E:7E:02:20:05:83:34:49:C7:35:2E:AF:09: 86:E4:AE:38:0A:76:31:B3:EB:E5:FF:4D:CE:4A:FF:BB: 64:B6:28:13:8D:B4:88 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 25 07:15:15.364 2026 GMT Extensions: 00:00:05:00:38:93:F0:B4 Signature : ecdsa-with-SHA256 30:45:02:21:00:9A:5E:98:D6:42:D2:2B:39:97:A4:16: E9:CA:E5:8C:0E:54:17:0C:17:41:9A:0D:33:B8:EE:BE: A1:41:CB:EA:FD:02:20:59:10:02:7C:45:60:1E:5D:D3: 81:28:F1:65:51:3D:E6:3C:34:B2:91:B5:FE:07:BA:B5: F6:CA:81:6B:77:B4:DF
-----BEGIN CERTIFICATE-----
MIIGcjCCBVqgAwIBAgISBrDcJ0NiFcgkpdO6UjdUCqwtMA0GCSqGSIb3DQEBCwUA
MDMxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQwwCgYDVQQD
EwNZUjEwHhcNMjYwODI1MDYxNjQ0WhcNMjYxMTIzMDYxNjQzWjAZMRcwFQYDVQQD
Ew5tYWlsLmtleXdlYi5kZTCCAiIwDQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIB
AOmK1dsYSdA3+0EekWoMXvBD+Cs5ehkrnLafgbfWebCuWGTBUk431NLdw57duvUE
+OerxarTSDxOha/3pjHKx5kkZSkyeRyZ6A9bg3l1NxvBLGD/NvdbvEGA2VUxT/sX
i29AJ9DJzAkWjJ3hFhBEbOpNsCXfYB6od6tjxQqQuDPB8jE/eOVIRvf3Dm2uNiKt
WYhrcXhxHvaCi90GMUmfYYCJk72rFr6M8gViacgEz32lM829H1qnqp/TfRY2BjGb
mgKXbNL3sL/B4aT5frxstSdu5LtMPAXEsf/4Hfalo5gVk6FtMhbGZdYIxCkeGoCM
cMzAS8td7F2hU0k8CkkwzIw0BGAmUgGB5z2Bqb5XoQRyev/Pk4Ut5uqM5fi6OY5E
EJ8AUzjJPYJvBWAV5Jm85yfCo5jbfnhFp5aI2xzNsI2eDH7z0LrCbBTbApycwpGW
FGPTCmQN8wnTYQb/7cIdi8PdX4BoGB+XEGPhukRVS10vhJtb+WLk7v6pSdvPePXb
6Cv1HRP53HFC8Db04WjlL47ImbWMq5ZMiFfsZD9uzTpMX+8h6zyeeo6z6dJvUuHu
M0qS01I2oE1WHeSvU+MDnUJoCqsdBN1D+0Zg71pAR3cKijnkhwf/ImXqw1R+nb+b
rirynEzjuFg79UcQxek8i97KUW2QwvoKPQS9p94V9hjnAgMBAAGjggKYMIIClDAO
BgNVHQ8BAf8EBAMCBaAwEwYDVR0lBAwwCgYIKwYBBQUHAwEwDAYDVR0TAQH/BAIw
ADAdBgNVHQ4EFgQUMm927dAzmLbI2N7xMvKASqnS4aEwHwYDVR0jBBgwFoAUHy81
vkYUgs1Asa55LFV4+vfUaPswMwYIKwYBBQUHAQEEJzAlMCMGCCsGAQUFBzAChhdo
dHRwOi8veXIxLmkubGVuY3Iub3JnLzCBlAYDVR0RBIGMMIGJghRhdXRvY29uZmln
LmtleXdlYi5kZYIWYXV0b2Rpc2NvdmVyLmtleXdlYi5kZYISbWFpbC5rZXltYWNo
aW5lLmRlghJtYWlsLmtleW1hY2hpbmUuZXWCEG1haWwua2V5bWVkaWEudHaCDm1h
aWwua2V5d2ViLmRlgg9tYWlsLmtleXdlYi5vcmcwEwYDVR0gBAwwCjAIBgZngQwB
AgEwLgYDVR0fBCcwJTAjoCGgH4YdaHR0cDovL3lyMS5jLmxlbmNyLm9yZy80Ni5j
cmwwggEMBgorBgEEAdZ5AgQCBIH9BIH6APgAdgDLOPcViXyEoURfW8Hd+8lu8ppZ
zUcKaQWFsMsUwxRY5wAAAaA3xfPcAAAEAwBHMEUCIQCC9XOFqo1YNriur/ZeSu2c
eI1e7q7fvp8v+9kHfY5efgIgBYM0Scc1Lq8JhuSuOAp2MbPr5f9Nzkr/u2S2KBON
tIgAfgAai51rD/6/gbR5OcbSMQqG1tEC1PBG4hgsneNfXiYl7wAAAaA3xfUkAAgA
AAUAOJPwtAQDAEcwRQIhAJpemNZC0is5l6QW6crljA5UFwwXQZoNM7juvqFBy+r9
AiBZEAJ8RWAeXdOBKPFlUT3mPDSykbX+B7q19sqBa3e03zANBgkqhkiG9w0BAQsF
AAOCAQEASk7OnGMl9PGg6LM8w8zd2RyQhiRfW3sE/eeaAE1QyxdmEw03CtYdppN0
18WJkunwQ3ChuTSKiapAumqMMfOOOHjcIIW5MPdDgqHm/d3ApBPOb4RQDpO5J0WY
d41Uf13YrKupKqv+0Pjmqik3mGbUx7OvI0OZqaatp+6sGU3kFKNEAxJfRR82LFXw
b4gV1I7JBswMR8yekYt7CUtQkbPIp7XIqvZ9Jb3BNcI2YAD8hEoZp42EUwCVLfkZ
JZhXT2mNY41UtvN5V+PdCMYOw37lkzNxDZ6D0hWNA88r/Nq6/WFQ8pYDoOpwMkYG
73Uc4K37DfWr02VL40cRA9H5Ta7aSw==
-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-09-30T15:34:45+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
703
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
2164
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-----
MIIF9DCCA9ygAwIBAgIRAPJLbRf52a18scn+p4eCaZ8wDQYJKoZIhvcNAQELBQAw
TzELMAkGA1UEBhMCVVMxKTAnBgNVBAoTIEludGVybmV0IFNlY3VyaXR5IFJlc2Vh
cmNoIEdyb3VwMRUwEwYDVQQDEwxJU1JHIFJvb3QgWDEwHhcNMjYwNTEzMDAwMDAw
WhcNMzIwOTAyMjM1OTU5WjAuMQswCQYDVQQGEwJVUzENMAsGA1UEChMESVNSRzEQ
MA4GA1UEAxMHUm9vdCBZUjCCAiIwDQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIB
ANvGJnN78CTJdWL3+eGfsLN5TrNBJs+VH9hRXqRbwxu9sGNiB0BD1fcOxbSUQCJI
M1xE13Db+5Cw1w0s0EBYsvuIP/6joF0w8cuImbgR1OGgYbSQ4OpzI+DG8SGuTlcE
873OCS+kh3srlo6vl43M5OJg4Aeo1sfHp6kTJDoIiFBNJAY+OKfX/FUvYKuhjT+n
o49lmqmupSBI5PkBQiqrEGtWU5uxU/cQWHGu8jSjFBznZqvbNPLMXMLFxCb3WTfr
JBXXjqvWG+v4bjzxjjeAtOlU7qarRDvNOyAuQYLln904M+faKx8hnLCpJ15ZqaEg
cNlY+9MMWcC5yvL2A2j3l9+2buggZX+dOE91zYmIdawTvSZuVvlbRrAlLxIB6pwM
BjneXCjYQ8+3BCCjssbSNpZU3hTcBDdhfAlEDlYr6pEatnMdmDT5BqnKC92bd0Eh
M1fbLHioLccLCuievT8ZkPhZrq7Mii7gNXAcUEAR8+lzYal+9zTg7C5DALyVOeG/
CqfRAMn1KSHCR0NSA6P8tn/mGRlnCct5rtVCLnVySVpU6H1qGg3DgTOuskf8eahT
MiYbI5ezPJmO5ertalskQ1utp74+eDy92PI4ftHKTbq9IWhH4YZKh3WnJEIt+oQv
lYZbY8tpEroKrFB6PFGzrJIDRyts4HqvuH52RFj2zv/BAgMBAAGjgeswgegwDgYD
VR0PAQH/BAQDAgEGMBMGA1UdJQQMMAoGCCsGAQUFBwMBMA8GA1UdEwEB/wQFMAMB
Af8wHQYDVR0OBBYEFN7nW2DQIm1AKH0/DQH+pLVStFGUMB8GA1UdIwQYMBaAFHm0
WeZ7tuXkAXOACIjIGlj26ZtuMDIGCCsGAQUFBwEBBCYwJDAiBggrBgEFBQcwAoYW
aHR0cDovL3gxLmkubGVuY3Iub3JnLzATBgNVHSAEDDAKMAgGBmeBDAECATAnBgNV
HR8EIDAeMBygGqAYhhZodHRwOi8veDEuYy5sZW5jci5vcmcvMA0GCSqGSIb3DQEB
CwUAA4ICAQA8spSI95KKfn2W6GMmDpHBJSPaLbsS3W93cijJCRCYAc1fsJgL1FIL
7C0C9ecPOdcwB2fi0Dk2p94j9iTJCxmt5CFSKLRWwnXT2MMSXexVxqoVB79BdWPx
VXETkVme/qYSAuKVHh5Ps+5BixgmwS1JkjSAc+MfrUbNssVEEnH0aEiAh+rotXAV
JSP/Ye7LJPEwD9DWG72vVWbhAcuOf5OLjz57Ctk7MgQHynZ7+PlHJtajroCaIbtC
r6tcZZaAwUQm+jQyeWdV+2hv9deOYFmKeQyjjcSrN5Nadrw+L9DZJLbA1HqeNvLh
BgqpP0fvJq2N6EtD574N6eMI7uMsJTnji2UDz9el5XLSv9fqJMuDQtYVb2oTNoKp
oUqhxPVC0aq4eG5MESaIdn8b5ZGSSeAJLMHXljEdlNza+ncfkviXk1POLnnFdvx8
/gk6M374WbLWFXw8N141B/Rl/tINGfl1TxOIiqtiMYkL02RSGb1kq34BL9NPP27z
RGMuHGnzS3hFIrRTfKxrzUZ9RzQWzEG3K6fJ3r2nqSltkeytis9DIBoFY9VmVyjL
M71DMi+y1+TRSJVClEMwvA4yL++7q9XZx5r5wBRWB4kQTKH5qyoZnDw7iiuh1lID
yDFx8r7i9vIJU5HS3moZLkYWAOilMaV9N56A9Bgb6dNcHkvg3NoaYA==
-----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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