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

mail.infronet.ru · 217.65.3.81:443

Verified

Certificate chain, hostname and dates verified using this server’s CA store.

Subject
CN=mail.infronet.ru
Issuer
C=US O=Let's Encrypt CN=YR1
Valid from
2026-09-12T11:38:34+00:00
Expires
2026-12-11T11:38:33+00:00
Days remaining
49
Serial (hex)
05A63F95AAD272717F4A2670DB51A16238F8
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:autoconfig.himcolor.com, DNS:autoconfig.infronet.ru, DNS:autoconfig.khimpozit.ru, DNS:autoconfig.polytekprom.ru, DNS:autoconfig.promten.ru, DNS:autoconfig.vpngate-001.ru, DNS:autodiscover.himcolor.com, DNS:autodiscover.infronet.ru, DNS:autodiscover.khimpozit.ru, DNS:autodiscover.polytekprom.ru, DNS:autodiscover.promten.ru, DNS:autodiscover.vpngate-001.ru, DNS:mail.infronet.ru

SHA-256 fingerprint

C9:79:C2:3A:D8:AF:40:B2:E5:64:D7:C5:52:EA:A3:C2:F8:A7:64:DA:2C:8F:9E:9B:EE:83:1D:D8:89:52:34:38
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
DC:03:19:5F:81:7C:8D:72:66:DD:D5:49:10:F9:DE:C5:D2:81:CB:CA
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:autoconfig.himcolor.com, DNS:autoconfig.infronet.ru, DNS:autoconfig.khimpozit.ru, DNS:autoconfig.polytekprom.ru, DNS:autoconfig.promten.ru, DNS:autoconfig.vpngate-001.ru, DNS:autodiscover.himcolor.com, DNS:autodiscover.infronet.ru, DNS:autodiscover.khimpozit.ru, DNS:autodiscover.polytekprom.ru, DNS:autodiscover.promten.ru, DNS:autodiscover.vpngate-001.ru, DNS:mail.infronet.ru
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr1.c.lencr.org/121.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : A8:26:CB:E3:0A:C6:35:12:46:53:3F:E0:65:F1:4F:19: D9:6E:19:08:13:C4:1D:D9:6D:79:00:B3:12:3C:55:27 Timestamp : Sep 12 12:37:05.444 2026 GMT Extensions: 00:00:05:00:31:F7:4D:E6 Signature : ecdsa-with-SHA256 30:44:02:20:4A:7A:6A:CD:AD:4C:2A:6B:5D:69:AA:CD: 59:17:49:80:72:19:1E:F2:8C:F3:B5:BA:34:D4:EF:4E: C9:FE:9E:D5:02:20:2D:56:68:A5:98:80:4E:3C:27:B3: D7:7E:36:83:58:77:3C:80:88:C2:AE:61:16:40:1A:EF: FB:C8:F7:4C:E9:54 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : AF:67:88:3B:57:B0:4E:DD:8F:A6:D9:7E:F6:2E:A8:EB: 81:0A:C7:71:60:F0:24:5E:55:D6:0C:2F:E7:85:87:3A Timestamp : Sep 12 12:37:10.818 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:C6:1F:6D:5F:4B:87:16:88:F3:06:94: E7:7F:1F:7C:89:3A:64:9F:31:62:A2:D7:75:11:5D:1D: 67:33:90:F4:E8:02:21:00:E0:7C:D3:21:0A:6F:BE:F8: B4:3F:E0:11:85:63:F3:02:1E:C5:DE:AC:56:95:D9:55: 1E:40:42:2E:FA:92:0B:11
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-10-22T20:51:47+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
681
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
2142
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

Registration / WHOIS →DNS records →