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

mastertel.ru · 79.171.174.104:443

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

Certificate verification failed

Subject
CN=*.mastertel.ru
Issuer
C=BE O=GlobalSign nv-sa CN=GlobalSign GCC R3 DV TLS CA 2020
Valid from
2026-07-02T14:44:03+00:00
Expires
2027-01-17T14:44:03+00:00
Days remaining
108
Serial (hex)
01E4F8037D8FB59B46F83446
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:*.mastertel.ru, DNS:mastertel.ru

SHA-256 fingerprint

EB:D3:CF:53:9B:9C:DF:5B:59:6A:33:3A:2C:FD:D9:AB:EF:01:E5:E9:D1:87:64:6B:3D:77:EB:72:1D:3F:CC:23
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
basicConstraints
CA:FALSE
authorityInfoAccess
CA Issuers - URI:http://secure.globalsign.com/cacert/gsgccr3dvtlsca2020.crt OCSP - URI:http://ocsp.globalsign.com/gsgccr3dvtlsca2020
certificatePolicies
Policy: 1.3.6.1.4.1.4146.1.10 CPS: https://www.globalsign.com/repository/ Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://crl.globalsign.com/gsgccr3dvtlsca2020.crl
subjectAltName
DNS:*.mastertel.ru, DNS:mastertel.ru
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
authorityKeyIdentifier
0D:98:C0:73:7F:AB:BD:BD:D9:47:4B:49:AD:0A:4A:0C:AC:3E:C7:7C
subjectKeyIdentifier
D1:40:2C:35:F2:EA:7E:71:04:C6:65:0F:58:6B:0F:83:04:E8:70:E9
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 1C:9F:68:2C:E9:FA:F0:45:69:50:F8:1B:96:8A:87:DD: DB:32:10:D8:4C:E6:C8:B2:E3:82:52:4A:C4:CF:59:9F Timestamp : Jul 2 14:44:07.221 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:92:8C:A1:E2:AF:BF:15:53:B7:D5:79: 1B:8A:74:E2:22:6A:41:C8:E3:85:65:0C:18:AA:95:18: 59:C8:FE:69:F5:02:21:00:E8:65:7F:AE:AF:63:81:7F: EA:6C:E5:7E:4F:8B:91:41:02:FF:CA:A1:63:1D:EF:A3: CE:B2:2D:C5:6E:B8:BD:99 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 4C:63:DC:98:E5:9C:1D:AB:88:F6:1E:8A:3D:DE:AE:8F: AB:44:A3:37:7B:5F:9B:94:C3:FB:A1:9C:FC:C1:BE:26 Timestamp : Jul 2 14:44:06.581 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:BF:03:5D:B7:4D:0C:21:E0:A5:D4:EB: C9:F2:7F:B7:3B:DC:AA:A7:8C:1B:FC:B3:DF:54:55:2C: F7:8E:E7:A2:E4:02:21:00:A5:28:FE:99:B9:22:7F:6B: E4:CF:B2:21:A3:AC:B6:52:2E:7C:F7:40:AD:A4:4A:76: F0:86:41:C3:5D:D8:1E:D2 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 : Jul 2 14:44:07.035 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:96:5C:41:01:FE:F8:89:86:E3:C5:55: 2E:C6:5A:36:F9:0C:0C:51:22:FB:3C:60:8A:D5:54:85: 9F:3E:EC:7F:05:02:21:00:F1:B9:EA:0B:0B:DD:F8:E4: 96:A5:2E:E3:FA:05:E1:21:66:D6:11:12:C1:C9:86:61: 93:4E:5A:1A:0F:1A:4B:78
-----BEGIN CERTIFICATE-----
MIIGVDCCBTygAwIBAgIMAeT4A32PtZtG+DRGMA0GCSqGSIb3DQEBCwUAMFMxCzAJ
BgNVBAYTAkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMSkwJwYDVQQDEyBH
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LSNDvLexZzapjdUCSITMZQiVxoD01keMxTiCceRKI9mt2jfAmx/TLl8AUrOv6Ply
+km4aBTh6szThZxadqQKCFnyUItsf40RSFx6oB2q/zTJEMMExXBZb5/1lhU6pE0g
tmvq/eJv9xzsbZsC4K86hCCoEukidkJMr9QGVPMwsHT7GaKkaDPyAg==
-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-09-30T21:53:01+00:00

One endpoint on port 443. Server-presented chain; no revocation, OCSP, CT or full TLS security scan.

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