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

dcu.ie · 99.80.221.0:443

Verified

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

Subject
C=IE L=Dublin O=Dublin City University CN=dcu.ie
Issuer
C=GR O=Hellenic Academic and Research Institutions CA CN=GEANT TLS RSA 1
Valid from
2026-07-23T14:52:01+00:00
Expires
2027-02-07T14:52:00+00:00
Days remaining
123
Serial (hex)
3C34412279FEF21008A83CF427646098
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:dcu.ie, DNS:www.dcu.ie

SHA-256 fingerprint

44:99:4F:26:CE:BC:4F:8F:F9:42:24:AA:3E:3C:A3:DD:A5:37:BF:12:09:17:E8:1E:7C:FF:8F:BD:CF:F4:09:6E
Certificate extensions & PEM
basicConstraints
CA:FALSE
authorityKeyIdentifier
86:01:72:3F:8C:A9:70:E2:31:06:53:16:CE:01:5F:5B:79:C8:3C:3B
authorityInfoAccess
CA Issuers - URI:http://crt.harica.gr/HARICA-GEANT-TLS-R1.cer
subjectAltName
DNS:dcu.ie, DNS:www.dcu.ie
certificatePolicies
Policy: 2.23.140.1.2.2 Policy: 0.4.0.2042.1.7 Policy: 1.3.6.1.4.1.26513.1.1.1.2
extendedKeyUsage
TLS Web Client Authentication, TLS Web Server Authentication
crlDistributionPoints
Full Name: URI:http://crl.harica.gr/HARICA-GEANT-TLS-R1.crl
subjectKeyIdentifier
15:68:EF:8F:75:5A:89:3A:B1:B1:EB:0C:93:B6:95:50:AD:65:CC:C2
keyUsage
Digital Signature, Key Encipherment
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 : Jul 23 15:02:02.629 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:80:D3:5F:06:0D:3F:8B:BB:F9:25:5A: F6:06:9D:92:4A:52:77:F9:72:F6:14:2E:1F:3B:5C:D1: 2A:FC:7D:CE:13:02:20:6D:BB:C4:58:95:5E:B9:4A:81: 2C:8D:77:18:2A:56:52:AF:BF:94:A5:20:86:50:48:28: 46:AA:F7:C6:F9:53:3E Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 46:A2:39:67:C6:0D:B6:46:87:C6:6F:3D:F9:99:94:76: 93:A6:A6:11:20:84:57:D5:55:E7:E3:D0:A1:D9:B6:46 Timestamp : Jul 23 15:02:02.661 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:C5:6F:CE:62:9B:3C:CC:48:E9:14:DE: 12:E3:B7:73:68:D0:28:4D:A8:1A:E5:F8:D8:85:EE:0A: B3:CF:68:64:94:02:21:00:F5:11:E6:71:FE:92:CE:0C: 81:3B:C3:A5:D4:A3:0C:E5:D9:D5:F3:93:41:85:8F:68: 9E:77:2F:B5:7D:A7:B2:91 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 44:C2:BD:0C:E9:14:0E:64:A5:C9:4A:01:93:0A:5A:A1: BB:35:97:0E:00:EE:11:16:89:68:2A:1C:44:D7:B5:66 Timestamp : Jul 23 15:02:02.609 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:A8:2C:A9:B1:61:8E:B7:88:08:90:42: 10:94:EA:52:E7:18:19:F6:16:D2:67:38:D2:DE:BD:DC: C5:DE:09:D4:7A:02:21:00:C9:E9:B0:56:10:FE:0D:71: F7:1D:1F:DD:EB:EE:8A:5A:DA:79:13:AD:03:95:95:70: 7C:6D:CE:33:3D:B1:39:F9
-----BEGIN CERTIFICATE-----
MIIGmDCCBQCgAwIBAgIQPDRBInn+8hAIqDz0J2RgmDANBgkqhkiG9w0BAQsFADBg
MQswCQYDVQQGEwJHUjE3MDUGA1UECgwuSGVsbGVuaWMgQWNhZGVtaWMgYW5kIFJl
c2VhcmNoIEluc3RpdHV0aW9ucyBDQTEYMBYGA1UEAwwPR0VBTlQgVExTIFJTQSAx
MB4XDTI2MDcyMzE0NTIwMVoXDTI3MDIwNzE0NTIwMFowUDELMAkGA1UEBhMCSUUx
DzANBgNVBAcMBkR1YmxpbjEfMB0GA1UECgwWRHVibGluIENpdHkgVW5pdmVyc2l0
eTEPMA0GA1UEAwwGZGN1LmllMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC
AQEAw01V3/ineFbdG+3DcrkSm9RKz4GlAcSK32WrP0DGdaXa+t+uFPTt17Z8ozHH
M3TF1knirI0yKCpab6S9f1pTbUnDB5K20W+fOI9PG+NSluqxY7a3efa/qbdGqFU+
w/CdEGjHnunnxjpycAPw9luvWQKKlIwub6tMNUHrr7a1lwfEyB+BZ/yzLzYsiSw7
J5Y0r8ao/8WWONrMJU3oAUenbLfirqxfOilVHzO43m4dLZmAj5W8u8lNM6+Fsfy6
g4csY42nHkXmFnl7c8/HG/fo8IiRARh2ko6iURQ8DVkQl8l00uo2qsbHLbFVvR+h
B+gkZbbi/rLozXF3RgM3JBOlCwIDAQABo4IC3DCCAtgwDAYDVR0TAQH/BAIwADAf
BgNVHSMEGDAWgBSGAXI/jKlw4jEGUxbOAV9becg8OzBIBggrBgEFBQcBAQQ8MDow
OAYIKwYBBQUHMAKGLGh0dHA6Ly9jcnQuaGFyaWNhLmdyL0hBUklDQS1HRUFOVC1U
TFMtUjEuY2VyMB0GA1UdEQQWMBSCBmRjdS5pZYIKd3d3LmRjdS5pZTAtBgNVHSAE
JjAkMAgGBmeBDAECAjAIBgYEAI96AQcwDgYMKwYBBAGBzxEBAQECMB0GA1UdJQQW
MBQGCCsGAQUFBwMCBggrBgEFBQcDATA9BgNVHR8ENjA0MDKgMKAuhixodHRwOi8v
Y3JsLmhhcmljYS5nci9IQVJJQ0EtR0VBTlQtVExTLVIxLmNybDAdBgNVHQ4EFgQU
FWjvj3VaiTqxsesMk7aVUK1lzMIwDgYDVR0PAQH/BAQDAgWgMIIBgAYKKwYBBAHW
eQIEAgSCAXAEggFsAWoAdgBgTJqven93XwHUBvySDciZ6wscffjJUhv6+hd3O5eL
yQAAAZ+Pf3SFAAAEAwBHMEUCIQCA018GDT+Lu/klWvYGnZJKUnf5cvYULh87XNEq
/H3OEwIgbbvEWJVeuUqBLI13GCpWUq+/lKUghlBIKEaq98b5Uz4AdwBGojlnxg22
RofGbz35mZR2k6amESCEV9VV5+PQodm2RgAAAZ+Pf3SlAAAEAwBIMEYCIQDFb85i
mzzMSOkU3hLjt3No0ChNqBrl+NiF7gqzz2hklAIhAPUR5nH+ks4MgTvDpdSjDOXZ
1fOTQYWPaJ53L7V9p7KRAHcARMK9DOkUDmSlyUoBkwpaobs1lw4A7hEWiWgqHETX
tWYAAAGfj390cQAABAMASDBGAiEAqCypsWGOt4gIkEIQlOpS5xgZ9hbSZzjS3r3c
xd4J1HoCIQDJ6bBWEP4NcfcdH93r7opa2nkTrQOVlXB8bc4zPbE5+TANBgkqhkiG
9w0BAQsFAAOCAYEAlLT+hzqTtZIgCiLz5VvzIjnmujqnMCYoY179qzLF1VYXbudm
/vH6cXRoncPHkxjXdBKlz5ye4ZqTrVfC6EISJIlGbwljTSF5L4BFVR1QcRl7v43T
6ZjJP7mIVFdE7Wvj+N3hZT/OfPzRp1wETdindHvpB0ypbIRE9/intQNnf7yUXfsw
mflZpIaPmwxD1Wiz+kPtDeYD6Y/KCanzsVEJHPF2mopvg6p0Jw4+2q+NEe/TDGAz
VxWTjBfIibtEm+coiJ+3SOEvgXDNEKPDpQW8kS5jm2UqQgCWkkKELYuUgBxOxehq
GHzYLuc3pl1JEuCpNhgH3THKdixKMe/pWC1L4Vh5ima2+zBCaKHOlaw9TJHOGqZl
ZaauBAfl4E5EBQsa14oWGlbAEjRTXBmd5gVqodug+n1v5z0ZkmX3l2dJgB8Pfsus
3xcrogS+M24zDAXMr5TVDQmIdSjWQT7oUB0UFJDYi+76OtfHsf3UiOMMYV5o395a
LB+l4brAn1R2Y1Ab
-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-10-06T20:23:10+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=GR O=Hellenic Academic and Research Institutions CA CN=GEANT TLS RSA 1
Issuer
C=GR O=Hellenic Academic and Research Institutions CA CN=HARICA TLS RSA Root CA 2021
Valid from
2025-01-03T11:15:00+00:00
Expires
2039-12-31T11:14:59+00:00
Days remaining
4833
Serial (hex)
14D57BF3692228219A5567FA91651B22
Signature
RSA-SHA256
Public key
RSA 3072

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

5B:67:8D:C4:40:95:A5:28:95:B6:3B:31:F2:72:27:F4:B3:6C:3E:34:74:91:BF:2B:FA:69:18:37:A5:FB:8C:79
Certificate extensions & PEM
basicConstraints
CA:TRUE, pathlen:0
authorityKeyIdentifier
0A:48:23:A6:60:A4:92:0A:33:EA:93:5B:C5:57:EA:25:4D:BD:12:EE
authorityInfoAccess
CA Issuers - URI:http://crt.harica.gr/HARICA-TLS-Root-2021-RSA.cer
certificatePolicies
Policy: X509v3 Any Policy
extendedKeyUsage
TLS Web Client Authentication, TLS Web Server Authentication
crlDistributionPoints
Full Name: URI:http://crl.harica.gr/HARICA-TLS-Root-2021-RSA.crl
subjectKeyIdentifier
86:01:72:3F:8C:A9:70:E2:31:06:53:16:CE:01:5F:5B:79:C8:3C:3B
keyUsage
Digital Signature, Certificate Sign, CRL Sign
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Chain certificate 2

Subject
C=GR O=Hellenic Academic and Research Institutions CA CN=HARICA TLS RSA Root CA 2021
Issuer
C=GR L=Athens O=Hellenic Academic and Research Institutions Cert. Authority CN=Hellenic Academic and Research Institutions RootCA 2015
Valid from
2021-09-02T07:41:55+00:00
Expires
2029-08-31T07:41:54+00:00
Days remaining
1059
Serial (hex)
2A6086D4D4DE45C95E4B98FBBF2FBF26
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

4A:CD:8D:C6:02:0A:54:5A:85:89:43:A5:53:B5:E0:F3:FC:5B:85:9A:EA:17:46:65:0D:69:CF:12:10:F9:56:D8
Certificate extensions & PEM
basicConstraints
CA:TRUE
authorityKeyIdentifier
71:15:67:C8:C8:C9:BD:75:5D:72:D0:38:18:6A:9D:F3:71:24:54:0B
authorityInfoAccess
CA Issuers - URI:http://repo.harica.gr/certs/HaricaRootCA2015.crt
certificatePolicies
Policy: X509v3 Any Policy
extendedKeyUsage
TLS Web Client Authentication, TLS Web Server Authentication
crlDistributionPoints
Full Name: URI:http://crl.harica.gr/HaricaRootCA2015.crl
subjectKeyIdentifier
0A:48:23:A6:60:A4:92:0A:33:EA:93:5B:C5:57:EA:25:4D:BD:12:EE
keyUsage
Digital Signature, Certificate Sign, CRL Sign
-----BEGIN CERTIFICATE-----
MIIGwDCCBKigAwIBAgIQKmCG1NTeRcleS5j7vy+/JjANBgkqhkiG9w0BAQsFADCB
pjELMAkGA1UEBhMCR1IxDzANBgNVBAcTBkF0aGVuczFEMEIGA1UEChM7SGVsbGVu
aWMgQWNhZGVtaWMgYW5kIFJlc2VhcmNoIEluc3RpdHV0aW9ucyBDZXJ0LiBBdXRo
b3JpdHkxQDA+BgNVBAMTN0hlbGxlbmljIEFjYWRlbWljIGFuZCBSZXNlYXJjaCBJ
bnN0aXR1dGlvbnMgUm9vdENBIDIwMTUwHhcNMjEwOTAyMDc0MTU1WhcNMjkwODMx
MDc0MTU0WjBsMQswCQYDVQQGEwJHUjE3MDUGA1UECgwuSGVsbGVuaWMgQWNhZGVt
aWMgYW5kIFJlc2VhcmNoIEluc3RpdHV0aW9ucyBDQTEkMCIGA1UEAwwbSEFSSUNB
IFRMUyBSU0EgUm9vdCBDQSAyMDIxMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIIC
CgKCAgEAi8Lnr2WbBWeWyQ0kudAOZPzO4iQYLIR/d1HLBBE2uF7taXGnnuQlCZdn
wUfCz5EWNmI9OAThUYL/rNK0ad0u7BGjRe5raztMv4yNpB6dEbnpOPl6DgyY4iMd
0U5j1Oe4QUT7a69r2h/TxZGIW6SJktGB5ow5WKDWaUOprZhSWG7bCvtrz2j646Re
OkVzmAfqXwJy3gyls5+uqR23HbP8ilnnbnJlrfUwlCMH84IWSzWYnFO7L8rkWtnH
jR38mJn7LKSCa/AqH44LX3FcXK5CeymJgcsDo5nKiJ4LQAlBM9vmWHr9rplwwFoP
1hOGcS92afyQ3dstbtHym/Uaa55vFYx68EsooCI4gCRsNqQ78jCR83gTz8E/Navx
HREjtUMingGStxgC5RHRgtsVAMxhN8EqfJrh0LqzUEbugqydMfj7I+IDAEhwowkm
eRVTYPM4XK046oEAYxS5M17dC9ugRQcaMwn4TbSnAqZp9MJZBYhlhVauS8vg3jx9
LRrI6fsfo2FK1ioTrXdMGhibkQ9Y2AZUxZf4qj8giqaFpnf2pvwc4u5ulDMqg1CE
CuVPhvhQRXgAgetbaOMmjcx7XFH0FCxAvhpgHXpyYR0fYy2Iqs6iRZAI/Gu+s1Aq
Wv2oSBhG1pBAkpAKhF5oMfjr7Q3THcZ9mRhVVidlLo1FxSTszuMCAwEAAaOCASEw
ggEdMA8GA1UdEwEB/wQFMAMBAf8wHwYDVR0jBBgwFoAUcRVnyMjJvXVdctA4GGqd
83EkVAswTAYIKwYBBQUHAQEEQDA+MDwGCCsGAQUFBzAChjBodHRwOi8vcmVwby5o
YXJpY2EuZ3IvY2VydHMvSGFyaWNhUm9vdENBMjAxNS5jcnQwEQYDVR0gBAowCDAG
BgRVHSAAMB0GA1UdJQQWMBQGCCsGAQUFBwMCBggrBgEFBQcDATA6BgNVHR8EMzAx
MC+gLaArhilodHRwOi8vY3JsLmhhcmljYS5nci9IYXJpY2FSb290Q0EyMDE1LmNy
bDAdBgNVHQ4EFgQUCkgjpmCkkgoz6pNbxVfqJU29Eu4wDgYDVR0PAQH/BAQDAgGG
MA0GCSqGSIb3DQEBCwUAA4ICAQDAze/rVni3cYGP1BWkxXnIVynqHcC6Cw7kbkXo
XBZAqF9ANQAKoz2YQ+WyzrparKVilMG6p6mdWTKeLy6eQDRhFSu9DrMYr4TBYxIp
2e5ZLQBk96xbG3wSepBCkTDA0MA0NybzM0gF5nTa82BMCED8EQXliWWsgqUorXuk
7msadosX793M42llmAcj1zJkADzlyzi4gcPvIc4skfmz1OW9jxxwyaR/41VYzPVy
w7m0rsL9n3v5PCFJ1zrldYayKq9gOdwOZInNJQgPU6imXEFBZWdqdR+xdL7qHVMk
dzBRoFqnYjr2bonw87Rxk7dAsdzmUUPJTIayzDTdtU78XkOl0FivJWBXDQPiVB2Z
5NdOVPUANDnADA5octuC3YTG2ncpG9aNKM4ggAyr3imdnz5UZdioYkecv2TVJHT2
lXE5PH/ifJs8p9+WFgyzFsW97BUF1nKsZiUWvlyPY9C9PKuhI4OMeTEA99YIRXYj
XDSZq300ko5sXUVKVG2osAR4Sr3wqS5hLGNBfym7FZwsQ+/ja+fenEALAbAiEMpI
9h71lpMpIhdx7rdRznNeSOok/pVMaqvBZ0IvAq+yXb7d8C+tAND0IcUxYyyJqkE7
89RJdcGZO9JMXv4inBFIEuMAMlGPxzcroEx+ehDXyGR0asw7CooV2DCfiEJlIsKz
LcPZew==
-----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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