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.best.com.ua · 95.158.22.16:443

Verified

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

Subject
CN=mail.best.com.ua
Issuer
C=US O=Let's Encrypt CN=YR1
Valid from
2026-10-27T01:16:14+00:00
Expires
2027-01-25T01:16:13+00:00
Days remaining
80
Serial (hex)
05D2714DF6B49DCECCEFDC9E81ABBB432B6C
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:mail.best.com.ua, DNS:webmail.best.com.ua

SHA-256 fingerprint

2C:1C:25:21:C8:35:86:33:11:3A:BF:37:90:DE:13:87:7B:46:6F:25:6C:CD:57:08:94:CD:FE:9E:50:A8:C9:B9
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
1A:71:40:8C:62:B7:E7:00:46:BA:49:78:AE:A1:36:06:B3:84:62:9D
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:mail.best.com.ua, DNS:webmail.best.com.ua
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr1.c.lencr.org/109.crl
ct_precert_scts
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 : Oct 27 02:14:44.958 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:F2:EF:C5:0C:5C:03:78:7D:1D:8E:51: 31:F4:67:A5:79:F1:34:1C:CD:23:04:2E:66:A9:C7:88: A2:F3:01:2C:6B:02:21:00:8E:30:24:55:0A:69:A0:F0: E7:6C:F7:8F:45:A9:22:1F:74:00:76:61:E8:C9:57:CB: 7A:38:F2:22:25:E8:C6:20 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 1A:8B:9D:6B:8D:D7:91:D1:CD:05:49:ED:B6:03:55:D6: 06:B6:4F:AD:30:DB:71:FE:78:8F:0F:C7:C8:FB:C4:B1 Timestamp : Oct 27 02:14:45.740 2026 GMT Extensions: 00:00:05:00:0E:01:BA:FF Signature : ecdsa-with-SHA256 30:45:02:20:0D:A7:56:E1:7C:D2:69:33:E3:64:9B:B7: 65:85:9C:91:71:D7:6C:B1:96:C8:EA:F4:07:31:8D:C4: B1:1E:27:37:02:21:00:F4:33:C0:BD:77:79:E5:18:9D: 93:63:0F:B6:53:5E:4D:FA:BB:F8:EA:EA:01:0D:EE:81: D3:A5:A7:04:51:EB:A5
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-11-05T06:39:09+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
667
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
2128
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

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