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

mail01.vserver.site · 116.203.46.227:443

Verified

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

Subject
CN=mail01.vserver.site
Issuer
C=US O=Let's Encrypt CN=YR2
Valid from
2026-09-04T07:09:38+00:00
Expires
2026-12-03T07:09:37+00:00
Days remaining
68
Serial (hex)
06D8F5B5231C0E1BEFA456A7F2C1373DB3E3
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:autodiscover.sdr.nrw, DNS:mail01.vserver.site

SHA-256 fingerprint

12:3B:27:42:B9:79:94:80:CF:4E:DC:AF:AE:A5:25:DF:71:13:31:AA:95:98:AE:05:AD:8B:EC:F7:ED:4C:0A:EE
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
E6:D1:2E:52:C1:D4:00:58:3C:AF:8A:37:EA:09:49:05:74:E9:1B:51
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:autodiscover.sdr.nrw, DNS:mail01.vserver.site
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr2.c.lencr.org/100.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : D8:09:55:3B:94:4F:7A:FF:C8:16:19:6F:94:4F:85:AB: B0:F8:FC:5E:87:55:26:0F:15:D1:2E:72:BB:45:4B:14 Timestamp : Sep 4 08:08:08.955 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:EF:62:C5:93:32:8E:96:46:30:61:15: 94:B7:E9:90:4B:DC:BA:E8:7B:08:84:54:A1:06:A4:C8: 1F:36:36:65:43:02:20:65:59:0E:72:47:A6:BA:E8:CD: 2E:C8:BA:02:B3:3C:D6:9F:90:2D:60:46:85:D0:C1:98: B4:A8:3A:E8:D8:7B:79 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : A8:26:CB:E3:0A:C6:35:12:46:53:3F:E0:65:F1:4F:19: D9:6E:19:08:13:C4:1D:D9:6D:79:00:B3:12:3C:55:27 Timestamp : Sep 4 08:08:09.048 2026 GMT Extensions: 00:00:05:00:2B:D3:06:23 Signature : ecdsa-with-SHA256 30:45:02:20:57:C9:76:EC:C6:9F:CE:93:0C:E2:3A:93: 88:6D:68:2A:0B:19:7A:03:FC:61:7E:01:1F:DC:8A:18: D1:64:28:57:02:21:00:C9:DD:3A:DC:8E:48:C2:AD:50: A5:2F:61:EC:DA:EA:31:48:40:38:E4:A8:18:3C:07:7A: 21:99:5F:4D:B8:F0:C5
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-09-25T18:50:58+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
708
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
2169
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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