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

mx.comstar.ru · 213.87.75.51:443

Unverified
Certificate verification failed. These are unverified certificate details presented by the server. Peer certificate subjectAltName did not match expected name `mx.comstar.ru'

Certificate verification failed

Subject
CN=umail.ru
Issuer
C=BE O=GlobalSign nv-sa CN=GlobalSign GCC R46 DV TLS CA 2025
Valid from
2026-09-18T07:43:44+00:00
Expires
2027-04-05T07:43:44+00:00
Days remaining
166
Serial (hex)
563BCCA51DEB3CDDBC8D8168
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:umail.ru

SHA-256 fingerprint

36:56:62:07:8C:20:AF:65:9F:66:CC:E4:70:E5:35:ED:BC:61:C1:E6:66:A7:37:FD:0A:01:23:FF:88:6A:A6:BF
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
basicConstraints
CA:FALSE
authorityInfoAccess
CA Issuers - URI:http://secure.globalsign.com/cacert/gsgccr46dvtlsca2025.crt OCSP - URI:http://ocsp.globalsign.com/gsgccr46dvtlsca2025
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://crl.globalsign.com/gsgccr46dvtlsca2025.crl
subjectAltName
DNS:umail.ru
authorityKeyIdentifier
08:69:E9:7F:A5:AB:F4:C3:61:E5:CD:8E:7B:47:EF:8B:29:64:8D:EC
extendedKeyUsage
TLS Web Server Authentication
subjectKeyIdentifier
88:07:B6:25:62:BE:F1:87:1D:95:8D:15:18:A5:0A:1D:6F:A4:A4:B2
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 : Sep 18 07:44:44.864 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:46:2D:03:B6:B7:70:94:02:9D:E1:6C:C1: B7:52:EF:4F:3C:3C:C4:6E:27:F5:DE:8E:97:B2:79:5D: 09:2E:34:E6:02:20:6F:95:66:80:30:77:CD:CE:AF:36: 17:45:08:69:74:D9:51:83:71:3A:29:E8:0A:DC:8F:95: 27:F9:33:6C:26:4F 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 : Sep 18 07:44:44.194 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:C2:7E:32:BF:A1:D5:2D:E0:7A:C6:E5: 20:29:C7:2E:53:99:30:BD:A8:C0:8B:85:30:1C:65:C2: EF:1C:33:AC:A2:02:21:00:88:67:62:81:FF:68:86:C7: A2:F8:13:7A:E9:5A:DF:39:26:47:CE:68:EA:A9:14:3E: 18:4A:E3:E2:BA:3C:17:1D 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 : Sep 18 07:44:44.676 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:8C:9E:85:17:87:6B:F5:84:9D:1C:26: C8:D5:88:70:AB:DC:70:1C:5C:72:46:B5:39:6E:01:9B: C2:CF:73:8E:F4:02:20:77:2A:CD:40:AB:9A:76:90:6A: 63:35:69:6F:A4:B5:7E:7A:FF:71:5A:0E:45:CC:0B:33: 82:E5:57:63:97:E4:7D
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-10-21T00:06:14+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=BE O=GlobalSign nv-sa CN=GlobalSign GCC R46 DV TLS CA 2025
Issuer
C=BE O=GlobalSign nv-sa CN=GlobalSign Root R46
Valid from
2025-09-17T02:55:44+00:00
Expires
2029-06-23T00:00:00+00:00
Days remaining
975
Serial (hex)
8443588121DB5AB28499FFAE80670BA4
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

B5:94:10:F3:67:B9:86:E9:8E:53:A9:78:9A:65:80:55:3A:74:BE:51:52:11:D9:F6:EC:B6:E8:A1:1E:83:AE:AA
Certificate extensions & PEM
keyUsage
Digital Signature, Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:TRUE, pathlen:0
subjectKeyIdentifier
08:69:E9:7F:A5:AB:F4:C3:61:E5:CD:8E:7B:47:EF:8B:29:64:8D:EC
authorityKeyIdentifier
03:5C:AB:73:81:87:A8:CC:B0:A6:D5:94:E2:36:96:49:FF:05:99:2C
authorityInfoAccess
OCSP - URI:http://ocsp.globalsign.com/rootr46 CA Issuers - URI:http://secure.globalsign.com/cacert/rootr46.crt
crlDistributionPoints
Full Name: URI:http://crl.globalsign.com/rootr46.crl
certificatePolicies
Policy: 2.23.140.1.2.1 Policy: 1.3.6.1.4.1.4146.10.1.3
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Chain certificate 2

Subject
C=BE O=GlobalSign nv-sa CN=GlobalSign Root R46
Issuer
C=BE O=GlobalSign nv-sa CN=GlobalSign Root R46
Valid from
2019-03-20T00:00:00+00:00
Expires
2046-03-20T00:00:00+00:00
Days remaining
7089
Serial (hex)
11D2BBB9D723189E405F0A9D2DD0DF2567D1
Signature
RSA-SHA384
Public key
RSA 4096

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

4F:A3:12:6D:8D:3A:11:D1:C4:85:5A:4F:80:7C:BA:D6:CF:91:9D:3A:5A:88:B0:3B:EA:2C:63:72:D9:3C:40:C9
Certificate extensions & PEM
keyUsage
Digital Signature, Certificate Sign, CRL Sign
basicConstraints
CA:TRUE
subjectKeyIdentifier
03:5C:AB:73:81:87:A8:CC:B0:A6:D5:94:E2:36:96:49:FF:05:99:2C
-----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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