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

21vianet.com · 124.251.110.133:443

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
The certificate has expired.

Certificate verification failed

Subject
CN=www.vnet.com
Issuer
C=US O=Let's Encrypt CN=R13
Valid from
2026-01-25T23:57:06+00:00
Expires
2026-04-25T23:57:05+00:00
Days remaining
-152
Serial (hex)
06D9011BAD2D4EDB5EBC6A9D397149C3A6DD
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:www.vnet.com

SHA-256 fingerprint

C0:B7:46:E2:6B:F0:B3:9C:7C:ED:2D:13:C5:36:61:19:39:16:87:31:BA:4A:23:8B:16:35:FA:29:8A:06:3C:C0
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
38:17:78:85:04:B2:7B:8F:90:A7:3B:F6:CA:FC:C8:C0:49:D1:21:12
authorityKeyIdentifier
E7:AB:9F:0F:2C:33:A0:53:D3:5E:4F:78:C8:B2:84:0E:3B:D6:92:33
authorityInfoAccess
CA Issuers - URI:http://r13.i.lencr.org/
subjectAltName
DNS:www.vnet.com
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://r13.c.lencr.org/94.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 96:97:64:BF:55:58:97:AD:F7:43:87:68:37:08:42:77: E9:F0:3A:D5:F6:A4:F3:36:6E:46:A4:3F:0F:CA:A9:C6 Timestamp : Jan 26 00:55:37.466 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:69:77:37:3B:74:FF:17:13:43:EA:D4:FB: 6F:1E:57:C3:49:E1:C7:9D:40:12:8F:EE:7B:0F:C9:52: 0E:5A:45:01:02:20:7D:39:83:65:5A:3D:D9:0D:3E:A5: CF:3D:62:A4:F1:2B:7D:1C:5E:2E:F5:28:4D:AF:9D:9C: 13:C4:AB:E6:FA:BC Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 1A:8B:9D:69:4A:57:98:C8:99:A0:CA:88:BD:F4:8F:C0: B4:56:60:CC:C3:60:0D:1F:71:F4:69:FF:C7:D1:AC:A3 Timestamp : Jan 26 00:55:37.740 2026 GMT Extensions: 00:00:05:00:3C:1E:EA:34 Signature : ecdsa-with-SHA256 30:45:02:20:73:B5:3C:85:29:33:DD:9E:E9:9D:26:B8: D8:DF:2B:02:42:F6:59:37:84:6D:17:AD:4D:E6:FF:F9: A5:8B:6C:9C:02:21:00:B9:46:7B:65:5D:B0:CF:3B:D3: 78:50:65:75:A7:16:56:0B:71:A2:7D:29:A1:BC:0F:18: 56:90:14:BD:FC:84:F6
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-09-24T00:21:13+00:00

Server-presented chain · 1 additional certificate

Chain certificate 1

Subject
C=US O=Let's Encrypt CN=R13
Issuer
C=US O=Internet Security Research Group CN=ISRG Root X1
Valid from
2024-03-13T00:00:00+00:00
Expires
2027-03-12T23:59:59+00:00
Days remaining
169
Serial (hex)
5A00F212D8D4B480F3924157EA298305
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

D3:B1:28:21:6A:84:3F:8E:F1:32:15:01:F5:DF:52:A5:DF:52:93:9E:E2:C1:92:97:71:2C:D3:DE:4D:41:93:54
Certificate extensions & PEM
keyUsage
Digital Signature, Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Client Authentication, TLS Web Server Authentication
basicConstraints
CA:TRUE, pathlen:0
subjectKeyIdentifier
E7:AB:9F:0F:2C:33:A0:53:D3:5E:4F:78:C8:B2:84:0E:3B:D6:92:33
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

Registration / WHOIS →DNS records →