THE CERTIFICATE BEHIND THE CONNECTION

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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

mai.ru · 194.54.177.229:443

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

Certificate verification failed

Subject
CN=mai.ru O=Московский авиационный институт C=RU ST=77 г.Москва L=г. Москва street=Волоколамское шоссе, д. 4 UNDEF=7712038455 OGRN=1037739180820
Issuer
C=RU O=The Ministry of Digital Development and Communications CN=Russian Trusted Sub CA
Valid from
2026-08-25T09:14:13+00:00
Expires
2027-08-25T09:14:13+00:00
Days remaining
312
Serial (hex)
383295D9F2814CBBAB516050FDB8D2AF
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:mai.ru, DNS:*.mai.ru

SHA-256 fingerprint

48:A5:03:E3:F0:C5:47:E0:50:5D:51:0D:15:95:A2:1E:AD:7A:6E:41:BA:DD:2C:D7:1E:79:42:3E:C7:7F:F4:A7
Certificate extensions & PEM
subjectKeyIdentifier
B1:62:B2:48:72:38:88:3F:A2:A8:B2:24:D6:6D:00:81:47:7D:B4:4F
authorityKeyIdentifier
77:3D:D9:39:AF:42:BD:DC:5B:CA:76:EA:EE:FD:CE:3E:61:29:30:5F
keyUsage
Digital Signature, Key Encipherment, Key Agreement
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
subjectAltName
DNS:mai.ru, DNS:*.mai.ru
crlDistributionPoints
Full Name: URI:http://nuc-cdp.voskhod.ru/cdp/subca_ssl_rsa2024_ov.crl Full Name: URI:http://nuc-cdp.digital.gov.ru/cdp/subca_ssl_rsa2024_ov.crl
authorityInfoAccess
CA Issuers - URI:http://nuc-cdp.voskhod.ru/cdp/subca_ssl_rsa2024.crt CA Issuers - URI:http://nuc-cdp.digital.gov.ru/cdp/subca_ssl_rsa2024.crt OCSP - URI:http://nuc-ocsp.voskhod.ru
certificatePolicies
Policy: 2.23.140.1.2.2
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : D4:B3:7F:F2:73:4F:26:F1:E5:50:75:E5:85:5B:70:4F: DE:71:BB:7D:05:C7:57:D3:DC:EB:13:7F:62:43:AD:24 Timestamp : Aug 25 09:14:13.819 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:7B:9E:82:6F:76:0E:1C:AC:E0:DD:0D:1F: 10:53:82:B5:70:A9:F3:D7:A1:4E:80:48:81:0F:6F:AB: 72:C7:B0:74:02:20:3B:A9:7D:19:D1:2A:DE:55:C3:33: 89:6A:21:32:D2:53:8E:A7:7B:6B:21:C3:B4:7D:2A:D9: BB:09:6E:FA:AF:A9 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 1A:E9:16:87:66:D7:F7:8A:9C:B0:86:F8:C4:9C:3C:5D: CE:B8:C9:93:00:A9:AF:4B:FF:B0:9B:07:4F:81:2C:17 Timestamp : Aug 25 09:14:13.844 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:81:9E:37:3C:28:D5:55:0B:7D:E3:B8: 1D:F3:F5:1E:81:B1:34:9A:E5:C0:53:70:9C:B4:AE:CB: 0E:C8:82:D9:E1:02:20:76:3A:C0:7A:B4:B3:6C:B5:2A: E8:6E:78:FF:0E:64:B8:FB:C7:AD:1C:F3:2F:74:9F:0E: A9:12:A7:05:75:CE:56 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 4C:98:A0:DD:BB:F4:75:93:66:0C:36:E8:66:26:87:14: 09:F9:7E:78:78:4E:91:9E:A9:6A:F8:1C:53:27:5C:D6 Timestamp : Aug 25 09:14:13.812 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:2B:DA:AC:1C:93:E7:BC:95:82:06:AD:DE: 84:C1:E2:E1:F4:BB:BC:0D:82:BB:7E:12:43:74:3D:CC: E1:EA:87:71:02:20:36:B0:0B:6A:0E:47:6E:B1:88:84: 4D:13:DD:9A:DF:8D:30:6C:B0:A8:6F:4E:C5:4C:D3:3A: 0C:F6:B7:6A:5C:BD
-----BEGIN CERTIFICATE-----
MIIIczCCBlugAwIBAgIQODKV2fKBTLurUWBQ/bjSrzANBgkqhkiG9w0BAQsFADBv
MQswCQYDVQQGEwJSVTE/MD0GA1UECgw2VGhlIE1pbmlzdHJ5IG9mIERpZ2l0YWwg
RGV2ZWxvcG1lbnQgYW5kIENvbW11bmljYXRpb25zMR8wHQYDVQQDDBZSdXNzaWFu
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ggEFMQ8wDQYDVQQDDAZtYWkucnUxRTBDBgNVBAoMPNCc0L7RgdC60L7QstGB0LrQ
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A1UEBhMCUlUxGzAZBgNVBAgMEjc3INCzLtCc0L7RgdC60LLQsDEZMBcGA1UEBwwQ
0LMuINCc0L7RgdC60LLQsDE1MDMGA1UECQws0JLQvtC70L7QutC+0LvQsNC80YHQ
utC+0LUg0YjQvtGB0YHQtSwg0LQuIDQxFTATBgUqhQNkBBIKNzcxMjAzODQ1NTEY
MBYGBSqFA2QBEg0xMDM3NzM5MTgwODIwMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8A
MIIBCgKCAQEA0IcfGCgy+Slt1nS9yfpQYyJvasDPBlE8AizeCGMU+PozNa7ZzeM8
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MAGGGmh0dHA6Ly9udWMtb2NzcC52b3NraG9kLnJ1MBMGA1UdIAQMMAowCAYGZ4EM
AQICMIIBfAYKKwYBBAHWeQIEAgSCAWwEggFoAWYAdQDUs3/yc08m8eVQdeWFW3BP
3nG7fQXHV9Pc6xN/YkOtJAAAAaA4MuG7AAAEAwBGMEQCIHuegm92Dhys4N0NHxBT
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T2SqbTeS3gangsM/vvXSOhLww9/N07Ztp10/gzm8tKQpVaS0N8Ju4tgX3smABQHm
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M/XvFbsc7RgRvLi7sJvnHe1oSzjNnL04R7qCZ+k2WimyIGPsuXF9RuMl29MjFl3M
fs/uZxOIfNN/Vg09xudHucxCKMfoSTw5NEashFCgFmeZkU7UnpMQP8Gyj9D8mbHf
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28IZcx0uZd0lemZdwIBZXhy+QL52FWbbTFg5rpCOQ9vO6RoeCSBZwrYzoPZKsej8
o29ypuLYrw==
-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-10-17T01:34:20+00:00

Server-presented chain · 3 additional certificates

Chain certificate 1

Subject
C=RU O=The Ministry of Digital Development and Communications CN=Russian Trusted Root CA
Issuer
C=RU O=The Ministry of Digital Development and Communications CN=Russian Trusted Root CA
Valid from
2022-03-01T21:04:15+00:00
Expires
2032-02-27T21:04:15+00:00
Days remaining
1959
Serial (hex)
1000
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

D2:6D:2D:02:31:B7:C3:9F:92:CC:73:85:12:BA:54:10:35:19:E4:40:5D:68:B5:BD:70:3E:97:88:CA:8E:CF:31
Certificate extensions & PEM
subjectKeyIdentifier
E1:D1:81:E5:CE:5A:5F:04:AA:D2:E9:B6:9D:66:B1:C5:FA:AC:2C:87
authorityKeyIdentifier
E1:D1:81:E5:CE:5A:5F:04:AA:D2:E9:B6:9D:66:B1:C5:FA:AC:2C:87
basicConstraints
CA:TRUE, pathlen:4
keyUsage
Digital Signature, Certificate Sign, CRL Sign
-----BEGIN CERTIFICATE-----
MIIFwjCCA6qgAwIBAgICEAAwDQYJKoZIhvcNAQELBQAwcDELMAkGA1UEBhMCUlUx
PzA9BgNVBAoMNlRoZSBNaW5pc3RyeSBvZiBEaWdpdGFsIERldmVsb3BtZW50IGFu
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VTE/MD0GA1UECgw2VGhlIE1pbmlzdHJ5IG9mIERpZ2l0YWwgRGV2ZWxvcG1lbnQg
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dCBDQTCCAiIwDQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBAMfFOZ8pUAL3+r2n
qqE0Zp52selXsKGFYoG0GM5bwz1bSFtCt+AZQMhkWQheI3poZAToYJu69pHLKS6Q
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YwCOXhOO2pDUx3ckmJlCMUGacUTnylyQW2VsJIyIGA8V0xzdaeUXg0VZ6ZmNUr5Y
Ber/EAOLPb8NYpsAhJe2mXjMB/J9HNsoFMBFJ0lLOT/+dQvjbdRZoOT8eqJpWnVD
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G8wkNKTPLDc4wH0FDTijhgxR3Y4PiS1HL2Zhw7bD3CbslmEGgfnnZojNkJtcLeBH
BLa52/dSwNU4WWLubaYSiAmA9IUMX1/RpfpxOxd4Ykmhz97oFbUaDJFipIggx5sX
ePAlkTdWnv+RWBxlJwMQ25oEHmRguNYf4Zr/Rxr9cS93Y+mdXIZaBEE0KS2iLRqa
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BKrS6badZrHF+qwshzAfBgNVHSMEGDAWgBTh0YHlzlpfBKrS6badZrHF+qwshzAS
BgNVHRMBAf8ECDAGAQH/AgEEMA4GA1UdDwEB/wQEAwIBhjANBgkqhkiG9w0BAQsF
AAOCAgEAALIY1wkilt/urfEVM5vKzr6utOeDWCUczmWX/RX4ljpRdgF+5fAIS4vH
tmXkqpSCOVeWUrJV9QvZn6L227ZwuE15cWi8DCDal3Ue90WgAJJZMfTshN4OI8cq
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C/B7yTqgI7rbyvox7DEXoX7rIiEqyNNUguTk/u3SZ4VXE2kmxdmSh3TQvybfbnXV
4JbCZVaqiZraqc7oZMnRoWrXRG3ztbnbes/9qhRGI7PqXqeKJBztxRTEVj8ONs1d
WN5szTwaPIvhkhO3CO5ErU2rVdUr89wKpNXbBODFKRtgxUT70YpmJ46VVaqdAhOZ
D9EUUn4YaeLaS8AjSF/h7UkjOibNc4qVDiPP+rkehFWM66PVnP1Msh93tc+taIfC
EYVMxjh8zNbFuoc7fzvvrFILLe7ifvEIUqSVIC/AzplM/Jxw7buXFeGP1qVCBEHq
391d/9RAfaZ12zkwFsl+IKwE/OZxW8AHa9i1p4GO0YSNuczzEm4=
-----END CERTIFICATE-----

Chain certificate 2

Subject
C=RU O=The Ministry of Digital Development and Communications CN=Russian Trusted Sub CA
Issuer
C=RU O=The Ministry of Digital Development and Communications CN=Russian Trusted Root CA
Valid from
2022-03-02T11:25:19+00:00
Expires
2027-03-06T11:25:19+00:00
Days remaining
140
Serial (hex)
1002
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

BB:BD:E2:10:3E:79:0B:99:9E:C6:2B:D0:3C:F6:25:A5:A2:E7:C3:16:E1:0A:FE:6A:49:0E:ED:EA:D8:B3:FD:9B
Certificate extensions & PEM
basicConstraints
CA:TRUE, pathlen:0
keyUsage
Digital Signature, Certificate Sign, CRL Sign
subjectKeyIdentifier
D1:E1:71:0D:0B:2D:81:4E:6E:8A:4A:8F:4C:23:B3:4C:5E:AB:69:0B
authorityKeyIdentifier
E1:D1:81:E5:CE:5A:5F:04:AA:D2:E9:B6:9D:66:B1:C5:FA:AC:2C:87
authorityInfoAccess
CA Issuers - URI:http://rostelecom.ru/cdp/rootca_ssl_rsa2022.crt CA Issuers - URI:http://company.rt.ru/cdp/rootca_ssl_rsa2022.crt CA Issuers - URI:http://reestr-pki.ru/cdp/rootca_ssl_rsa2022.crt
crlDistributionPoints
Full Name: URI:http://rostelecom.ru/cdp/rootca_ssl_rsa2022.crl Full Name: URI:http://company.rt.ru/cdp/rootca_ssl_rsa2022.crl Full Name: URI:http://reestr-pki.ru/cdp/rootca_ssl_rsa2022.crl
-----BEGIN CERTIFICATE-----
MIIHQjCCBSqgAwIBAgICEAIwDQYJKoZIhvcNAQELBQAwcDELMAkGA1UEBhMCUlUx
PzA9BgNVBAoMNlRoZSBNaW5pc3RyeSBvZiBEaWdpdGFsIERldmVsb3BtZW50IGFu
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Gk8ZS8DMrkdAh0xby4xAQ/mSWAfWrBmfzlOqGyoB1U47WTOeqNbWkkoAP2ys94+s
Jg4NTkiDVtXRF6nr6fYi0bSOvOFg0IQrMXO2Y8gyg9ARdPJwKtvWX8VPADCYMiWH
h4n8bZokIrImVKLDQKHY4jCsND2HHdJfnrdL2YJw1qFskNO4cSNmZydw0Wkgjv9k
F+KxqrDKlB8MZu2Hclph6v/CZ0fQ9YuE8/lsHZ0Qc2HyiSMnvjgK5fDc3TD4fa8F
E8gMNurM+kV8PT8LNIM+4Zs+LKEV8nqRWBaxkIVJGekkVKO8xDBOG/aN62AZKHOe
GcyIdu7yNMMRihGVZCYr8rYiJoKiOzDqOkPkLOPdhtVlgnhowzHDxMHND/E2WA5p
ZHuNM/m0TXt2wTTPL7JH2YC0gPz/BvvSzjksgzU5rLbRyUKQkgU=
-----END CERTIFICATE-----

Chain certificate 3

Subject
C=RU O=The Ministry of Digital Development and Communications CN=Russian Trusted Sub CA
Issuer
C=RU O=The Ministry of Digital Development and Communications CN=Russian Trusted Root CA
Valid from
2024-07-15T12:50:41+00:00
Expires
2029-07-19T12:50:41+00:00
Days remaining
1006
Serial (hex)
1005
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

21:55:78:50:36:C9:00:DB:B5:F1:BB:2A:15:69:C8:0C:55:59:5B:D6:BF:94:86:7A:29:BB:DD:BC:7D:88:A3:F2
Certificate extensions & PEM
subjectKeyIdentifier
77:3D:D9:39:AF:42:BD:DC:5B:CA:76:EA:EE:FD:CE:3E:61:29:30:5F
authorityKeyIdentifier
E1:D1:81:E5:CE:5A:5F:04:AA:D2:E9:B6:9D:66:B1:C5:FA:AC:2C:87
keyUsage
Digital Signature, Certificate Sign, CRL Sign
basicConstraints
CA:TRUE, pathlen:0
authorityInfoAccess
CA Issuers - URI:http://nuc-cdp.voskhod.ru/cdp/rootca_ssl_rsa2022.crt CA Issuers - URI:http://nuc-cdp.digital.gov.ru/cdp/rootca_ssl_rsa2022.crt
crlDistributionPoints
Full Name: URI:http://nuc-cdp.voskhod.ru/cdp/rootca_ssl_rsa2022.crl Full Name: URI:http://nuc-cdp.digital.gov.ru/cdp/rootca_ssl_rsa2022.crl
-----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 →