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=YR1
Valid from
2026-11-03T08:10:44+00:00
Expires
2027-02-01T08:10:43+00:00
Days remaining
83
Serial (hex)
05AB6CF1EF91B35A4ADF07BAC50FEC518C10
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

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

SHA-256 fingerprint

50:E9:1C:D4:9B:DF:29:38:A6:40:F9:C5:EB:B9:7B:9D:9C:E7:6F:2E:FB:7A:21:8A:52:E2:0E:D7:FA:D3:26:42
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
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:autodiscover.sdr.nrw, DNS:mail01.vserver.site
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr1.c.lencr.org/17.crl
ct_precert_scts
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 : Nov 3 09:09:14.985 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:78:86:97:E6:C8:CD:AC:12:6E:79:87:CA: B9:20:36:CA:55:1C:46:6E:D9:FE:1F:22:21:58:CE:A3: 47:47:B8:44:02:20:62:DD:2E:D5:65:CF:A8:C7:FE:1F: 71:B2:37:B6:5E:82:DE:F1:35:49:E4:9A:A4:D8:03:A6: E3:85:59:5F:F7:89 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 1A:8B:9D:6B:8D:D7:91:D1:CD:05:49:ED:B6:03:55:D6: 06:B6:4F:AD:30:DB:71:FE:78:8F:0F:C7:C8:FB:C4:B1 Timestamp : Nov 3 09:09:16.740 2026 GMT Extensions: 00:00:05:00:11:EF:25:94 Signature : ecdsa-with-SHA256 30:45:02:20:61:48:05:B7:F7:DD:35:06:60:00:E1:85: 9F:46:51:B4:B9:03:F1:71:65:5A:10:62:59:B4:C7:78: 37:45:57:D3:02:21:00:CC:D9:0B:61:AE:FF:F8:4A:97: 46:76:8A:B7:11:E0:B0:7B:51:AB:03:5C:13:08:86:BF: CB:A1:54:39:58:B6:DB
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-11-10T05:20:42+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
662
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
2123
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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