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

TLSv1.2

mail.avetel.ru · 217.29.51.92:443

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=avetel-online.ru
Issuer
C=US O=Let's Encrypt CN=Let's Encrypt Authority X3
Valid from
2017-07-19T21:11:00+00:00
Expires
2017-10-17T21:11:00+00:00
Days remaining
-3291
Serial (hex)
0385945BFE444F4C17BD1DB502DF1C9234C9
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:avetel-online.ru, DNS:www.avetel-online.ru

SHA-256 fingerprint

1A:81:76:FB:BC:CD:E1:9E:27:29:D7:05:F1:D1:04:AA:7A:88:91:7C:B2:EF:54:F0:F3:44:4F:71:4D:0A:F0:B4
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
A1:CA:27:EF:6C:C5:CE:D0:F6:4A:4C:16:01:62:EE:01:E3:9C:B4:3B
authorityKeyIdentifier
A8:4A:6A:63:04:7D:DD:BA:E6:D1:39:B7:A6:45:65:EF:F3:A8:EC:A1
authorityInfoAccess
OCSP - URI:http://ocsp.int-x3.letsencrypt.org CA Issuers - URI:http://cert.int-x3.letsencrypt.org/
subjectAltName
DNS:avetel-online.ru, DNS:www.avetel-online.ru
certificatePolicies
Policy: 2.23.140.1.2.1 Policy: 1.3.6.1.4.1.44947.1.1.1 CPS: http://cps.letsencrypt.org User Notice: Explicit Text: This Certificate may only be relied upon by Relying Parties and only in accordance with the Certificate Policy found at https://letsencrypt.org/repository/
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: ECDHE-RSA-AES256-GCM-SHA384 · Checked 2026-10-21T07:17:26+00:00

Server-presented chain · 1 additional certificate

Chain certificate 1

Subject
C=US O=Let's Encrypt CN=Let's Encrypt Authority X3
Issuer
O=Digital Signature Trust Co. CN=DST Root CA X3
Valid from
2016-03-17T16:40:46+00:00
Expires
2021-03-17T16:40:46+00:00
Days remaining
-2044
Serial (hex)
0A0141420000015385736A0B85ECA708
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

25:84:7D:66:8E:B4:F0:4F:DD:40:B1:2B:6B:07:40:C5:67:DA:7D:02:43:08:EB:6C:2C:96:FE:41:D9:DE:21:8D
Certificate extensions & PEM
basicConstraints
CA:TRUE, pathlen:0
keyUsage
Digital Signature, Certificate Sign, CRL Sign
authorityInfoAccess
OCSP - URI:http://isrg.trustid.ocsp.identrust.com CA Issuers - URI:http://apps.identrust.com/roots/dstrootcax3.p7c
authorityKeyIdentifier
C4:A7:B1:A4:7B:2C:71:FA:DB:E1:4B:90:75:FF:C4:15:60:85:89:10
certificatePolicies
Policy: 2.23.140.1.2.1 Policy: 1.3.6.1.4.1.44947.1.1.1 CPS: http://cps.root-x1.letsencrypt.org
crlDistributionPoints
Full Name: URI:http://crl.identrust.com/DSTROOTCAX3CRL.crl
subjectKeyIdentifier
A8:4A:6A:63:04:7D:DD:BA:E6:D1:39:B7:A6:45:65:EF:F3:A8:EC:A1
-----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 →