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

mailserver.webstrategy.de · 212.6.181.244:443

Verified

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

Subject
CN=mailserver.webstrategy.de
Issuer
C=US O=Let's Encrypt CN=YR2
Valid from
2026-09-24T20:18:24+00:00
Expires
2026-12-23T20:18:23+00:00
Days remaining
45
Serial (hex)
05C43E2B0075F80B53A109DD1AF494F2D9A0
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:autoconfig.mailspice.com, DNS:autoconfig.martrexo.com, DNS:autoconfig.ts-verpackung.de, DNS:autoconfig.webstrategy.de, DNS:autoconfig.wepinski.de, DNS:autodiscover.mailspice.com, DNS:autodiscover.martrexo.com, DNS:autodiscover.ts-verpackung.de, DNS:autodiscover.webstrategy.de, DNS:autodiscover.wepinski.de, DNS:mailserver.ts-verpackung.de, DNS:mailserver.webstrategy.de, DNS:mta-sts.webstrategy.de

SHA-256 fingerprint

46:F9:6A:70:6E:B8:37:D7:7F:2D:C7:69:21:04:55:03:48:48:54:E2:44:0F:35:42:40:2F:80:DF:5E:0F:6D:20
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
54:41:C2:DC:D8:08:A7:BD:F9:25:D8:7D:C7:B0:18:59:5B:EC:57:4B
authorityKeyIdentifier
40:15:2D:26:79:ED:32:20:9E:DF:9A:72:1D:D6:32:1F:81:0C:81:0C
authorityInfoAccess
CA Issuers - URI:http://yr2.i.lencr.org/
subjectAltName
DNS:autoconfig.mailspice.com, DNS:autoconfig.martrexo.com, DNS:autoconfig.ts-verpackung.de, DNS:autoconfig.webstrategy.de, DNS:autoconfig.wepinski.de, DNS:autodiscover.mailspice.com, DNS:autodiscover.martrexo.com, DNS:autodiscover.ts-verpackung.de, DNS:autodiscover.webstrategy.de, DNS:autodiscover.wepinski.de, DNS:mailserver.ts-verpackung.de, DNS:mailserver.webstrategy.de, DNS:mta-sts.webstrategy.de
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr2.c.lencr.org/33.crl
ct_precert_scts
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 : Sep 24 21:16:54.861 2026 GMT Extensions: 00:00:05:00:14:58:4D:BD Signature : ecdsa-with-SHA256 30:44:02:20:76:43:4B:53:78:45:67:ED:00:BB:51:9C: CF:BC:48:0E:11:51:BD:F8:35:FD:B4:1D:76:E1:4F:F8: C9:C8:68:C7:02:20:71:AE:E5:D3:EF:D6:04:DA:AA:FE: 4E:5B:FC:29:41:6C:33:43:97:A5:4F:67:66:AB:05:8A: AE:27:C2:33:1C:8C Signed Certificate Timestamp: Version : v1 (0x0) Log ID : D7:6D:7D:10:D1:A7:F5:77:C2:C7:E9:5F:D7:00:BF:F9: 82:C9:33:5A:65:E1:D0:B3:01:73:17:C0:C8:C5:69:77 Timestamp : Sep 24 21:17:02.446 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:17:AE:49:5C:7C:A9:C0:1A:D3:D9:A0:6F: 05:06:57:2A:81:37:FA:C1:92:68:45:E4:EB:A2:72:AC: 23:FE:D9:A0:02:20:32:FA:46:ED:B2:09:64:8F:A5:11: 97:06:10:6B:94:57:41:C5:44:05:15:2D:D9:91:07:5E: F6:99:22:70:2B:4C
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-11-08T15:00:24+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=US O=Let's Encrypt CN=YR2
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
664
Serial (hex)
4EBD24947E24D394802D84A52FD5B319
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

23:8B:85:A0:09:9C:65:B9:70:47:7D:57:24:F1:A1:D4:75:CE:50:58:CF:FE:4E:FA:87:33:89:9B:DB:86:3C:47
Certificate extensions & PEM
keyUsage
Digital Signature, Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:TRUE, pathlen:0
subjectKeyIdentifier
40:15:2D:26:79:ED:32:20:9E:DF:9A:72:1D:D6:32:1F:81:0C:81:0C
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
2125
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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