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

osu.ru · 62.76.152.219:443

Verified

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

Subject
CN=www.osu.ru
Issuer
C=BE O=GlobalSign nv-sa CN=GlobalSign GCC R3 DV TLS CA 2020
Valid from
2025-10-20T08:49:15+00:00
Expires
2026-11-21T08:49:14+00:00
Days remaining
46
Serial (hex)
69B9B8ECCA697A13D6EF6889
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:www.osu.ru, DNS:autodiscover.osu.ru, DNS:mail.osu.ru, DNS:owa.osu.ru, DNS:osu.ru

SHA-256 fingerprint

CE:08:26:E7:F5:3F:8A:DA:37:7D:7E:8B:5E:A3:9A:57:A9:A5:A8:FA:69:BF:E3:E1:BA:04:28:28:00:2A:E4:E1
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:www.osu.ru, DNS:autodiscover.osu.ru, DNS:mail.osu.ru, DNS:owa.osu.ru, DNS:osu.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
4F:C8:68:39:0B:4E:15:53:33:80:DC:C8:5C:B2:B7:95:13:6B:5D:53
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : CB:38:F7:15:89:7C:84:A1:44:5F:5B:C1:DD:FB:C9:6E: F2:9A:59:CD:47:0A:69:05:85:B0:CB:14:C3:14:58:E7 Timestamp : Oct 20 08:49:19.027 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:7E:2D:61:88:BA:E3:29:9E:FE:42:89:75: 71:52:BB:BB:FD:F6:22:3E:18:2B:D2:6E:22:4D:53:3F: 81:83:9A:92:02:20:63:9D:59:38:D4:FA:70:DF:AD:FC: 0F:63:59:6A:46:DE:65:27:54:05:8A:C7:6B:EE:6F:6B: 23:A0:0F:9E:57:10 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : C2:31:7E:57:45:19:A3:45:EE:7F:38:DE:B2:90:41:EB: C7:C2:21:5A:22:BF:7F:D5:B5:AD:76:9A:D9:0E:52:CD Timestamp : Oct 20 08:49:18.948 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:A9:54:10:53:E2:1A:0B:CC:75:61:0B: 53:E3:BB:D9:87:96:D0:0F:68:BD:9B:ED:5C:D0:32:75: D8:EE:89:49:10:02:20:7C:D3:94:E3:F5:BC:9C:B7:02: AA:38:9B:70:39:FA:1A:F0:20:C8:37:7F:10:23:F3:71: DE:CE:05:06:40:3F:6E Signed Certificate Timestamp: Version : v1 (0x0) Log ID : C8:A3:C4:7F:C7:B3:AD:B9:35:6B:01:3F:6A:7A:12:6D: E3:3A:4E:43:A5:C6:46:F9:97:AD:39:75:99:1D:CF:9A Timestamp : Oct 20 08:49:18.695 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:B9:3A:F3:1F:9D:49:23:0B:4C:05:5D: 36:96:22:79:F3:F6:15:CD:5C:0A:1F:A2:B3:FF:DF:C9: BE:05:0A:33:93:02:20:13:BB:AA:EF:5E:ED:8B:89:E1: E8:3E:C5:9A:7D:BF:3F:F0:0E:90:C6:A9:F1:0D:8B:3C: E8:6A:42:44:0D:76:54
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: DHE-RSA-AES128-GCM-SHA256 · Checked 2026-10-06T04:52:14+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=BE O=GlobalSign nv-sa CN=GlobalSign GCC R3 DV TLS CA 2020
Issuer
OU=GlobalSign Root CA - R3 O=GlobalSign CN=GlobalSign
Valid from
2020-07-28T00:00:00+00:00
Expires
2029-03-18T00:00:00+00:00
Days remaining
893
Serial (hex)
77BD0E0742D5D9E9D049D774D02A6F9A
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

76:25:38:43:95:09:C4:11:C4:37:D3:C5:67:56:3E:13:78:67:12:81:FC:4A:14:64:AD:D0:31:87:08:43:67:6E
Certificate extensions & PEM
keyUsage
Digital Signature, Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
basicConstraints
CA:TRUE, pathlen:0
subjectKeyIdentifier
0D:98:C0:73:7F:AB:BD:BD:D9:47:4B:49:AD:0A:4A:0C:AC:3E:C7:7C
authorityKeyIdentifier
8F:F0:4B:7F:A8:2E:45:24:AE:4D:50:FA:63:9A:8B:DE:E2:DD:1B:BC
authorityInfoAccess
OCSP - URI:http://ocsp2.globalsign.com/rootr3 CA Issuers - URI:http://secure.globalsign.com/cacert/root-r3.crt
crlDistributionPoints
Full Name: URI:http://crl.globalsign.com/root-r3.crl
certificatePolicies
Policy: X509v3 Any Policy CPS: https://www.globalsign.com/repository/
-----BEGIN CERTIFICATE-----
MIIEsDCCA5igAwIBAgIQd70OB0LV2enQSdd00CpvmjANBgkqhkiG9w0BAQsFADBM
MSAwHgYDVQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xv
YmFsU2lnbjETMBEGA1UEAxMKR2xvYmFsU2lnbjAeFw0yMDA3MjgwMDAwMDBaFw0y
OTAzMTgwMDAwMDBaMFMxCzAJBgNVBAYTAkJFMRkwFwYDVQQKExBHbG9iYWxTaWdu
IG52LXNhMSkwJwYDVQQDEyBHbG9iYWxTaWduIEdDQyBSMyBEViBUTFMgQ0EgMjAy
MDCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAKxnlJV/de+OpwyvCXAJ
IcxPCqkFPh1lttW2oljS3oUqPKq8qX6m7K0OVKaKG3GXi4CJ4fHVUgZYE6HRdjqj
hhnuHY6EBCBegcUFgPG0scB12Wi8BHm9zKjWxo3Y2bwhO8Fvr8R42pW0eINc6OTb
QXC0VWFCMVzpcqgz6X49KMZowAMFV6XqtItcG0cMS//9dOJs4oBlpuqX9INxMTGp
6EASAF9cnlAGy/RXkVS9nOLCCa7pCYV+WgDKLTF+OK2Vxw3RUJ/p8009lQeUARv2
UCcNNPCifYX1xIspvarkdjzLwzOdLahDdQbJON58zN4V+lMj0msg+c0KnywPIRp3
BMkCAwEAAaOCAYUwggGBMA4GA1UdDwEB/wQEAwIBhjAdBgNVHSUEFjAUBggrBgEF
BQcDAQYIKwYBBQUHAwIwEgYDVR0TAQH/BAgwBgEB/wIBADAdBgNVHQ4EFgQUDZjA
c3+rvb3ZR0tJrQpKDKw+x3wwHwYDVR0jBBgwFoAUj/BLf6guRSSuTVD6Y5qL3uLd
G7wwewYIKwYBBQUHAQEEbzBtMC4GCCsGAQUFBzABhiJodHRwOi8vb2NzcDIuZ2xv
YmFsc2lnbi5jb20vcm9vdHIzMDsGCCsGAQUFBzAChi9odHRwOi8vc2VjdXJlLmds
b2JhbHNpZ24uY29tL2NhY2VydC9yb290LXIzLmNydDA2BgNVHR8ELzAtMCugKaAn
hiVodHRwOi8vY3JsLmdsb2JhbHNpZ24uY29tL3Jvb3QtcjMuY3JsMEcGA1UdIARA
MD4wPAYEVR0gADA0MDIGCCsGAQUFBwIBFiZodHRwczovL3d3dy5nbG9iYWxzaWdu
LmNvbS9yZXBvc2l0b3J5LzANBgkqhkiG9w0BAQsFAAOCAQEAy8j/c550ea86oCkf
r2W+ptTCYe6iVzvo7H0V1vUEADJOWelTv07Obf+YkEatdN1Jg09ctgSNv2h+LMTk
KRZdAXmsE3N5ve+z1Oa9kuiu7284LjeS09zHJQB4DJJJkvtIbjL/ylMK1fbMHhAW
i0O194TWvH3XWZGXZ6ByxTUIv1+kAIql/Mt29PmKraTT5jrzcVzQ5A9jw16yysuR
XRrLODlkS1hyBjsfyTNZrmL1h117IFgntBA5SQNVl9ckedq5r4RSAU85jV8XK5UL
REjRZt2I6M9Po9QL7guFLu4sPFJpwR1sPJvubS2THeo7SxYoNDtdyBHs7euaGcMa
D/fayQ==
-----END CERTIFICATE-----

Chain certificate 2

Subject
OU=GlobalSign Root CA - R3 O=GlobalSign CN=GlobalSign
Issuer
OU=GlobalSign Root CA - R3 O=GlobalSign CN=GlobalSign
Valid from
2009-03-18T10:00:00+00:00
Expires
2029-03-18T10:00:00+00:00
Days remaining
894
Serial (hex)
04000000000121585308A2
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

CB:B5:22:D7:B7:F1:27:AD:6A:01:13:86:5B:DF:1C:D4:10:2E:7D:07:59:AF:63:5A:7C:F4:72:0D:C9:63:C5:3B
Certificate extensions & PEM
keyUsage
Certificate Sign, CRL Sign
basicConstraints
CA:TRUE
subjectKeyIdentifier
8F:F0:4B:7F:A8:2E:45:24:AE:4D:50:FA:63:9A:8B:DE:E2:DD:1B:BC
-----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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