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

daouoffice.co.kr · 136.69.12.132:443

Verified

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

Subject
CN=daouoffice.co.kr
Issuer
C=US O=Google Trust Services CN=WR3
Valid from
2026-10-27T19:42:20+00:00
Expires
2027-01-25T20:38:14+00:00
Days remaining
80
Serial (hex)
4DC452BC6EFCC2E1108A1AAEDD567CA3
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:daouoffice.co.kr, DNS:*.daouoffice.co.kr

SHA-256 fingerprint

29:2C:0B:4C:AD:8D:BD:16:A7:37:13:E5:58:FA:94:4A:2D:BD:5E:8A:29:88:89:87:A3:E0:9B:A5:DA:76:BE:66
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
A2:1A:20:32:22:EF:48:BE:3D:1A:BD:52:58:81:96:48:36:1F:15:C1
authorityKeyIdentifier
C7:81:F5:FD:8E:88:D9:00:3C:4D:63:A2:50:31:24:A0:CE:23:FE:23
authorityInfoAccess
CA Issuers - URI:http://i.pki.goog/wr3.crt
subjectAltName
DNS:daouoffice.co.kr, DNS:*.daouoffice.co.kr
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://c.pki.goog/wr3/fqlubeBRsyI.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 1C:9F:68:2C:E9:FA:F0:45:69:50:F8:1B:96:8A:87:DD: DB:32:10:D8:4C:E6:C8:B2:E3:82:52:4A:C4:CF:59:9F Timestamp : Oct 27 20:42:20.541 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:18:8D:5F:F1:27:BD:1B:9D:A5:29:B4:1D: 42:38:CD:16:DE:74:BD:CE:53:C7:26:D8:C7:66:6F:54: 58:54:C4:38:02:21:00:C4:F0:18:4A:35:1C:63:C3:A6: 59:81:84:75:46:DD:15:0C:F0:BC:49:4E:F8:56:1A:E0: 98:24:47:70:5F:CD:AB Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 8E:CA:47:0B:AC:DE:6A:F3:A2:06:B0:A4:7A:84:B7:46: FE:1F:C6:BF:95:3E:25:E6:9B:4E:E4:02:48:F3:C6:E8 Timestamp : Oct 27 20:42:20.972 2026 GMT Extensions: 00:00:05:00:30:2D:51:B8 Signature : ecdsa-with-SHA256 30:45:02:20:0A:CF:A7:CB:38:3B:E4:BB:13:D5:A0:B6: D5:3E:C7:55:29:D5:73:DB:2D:9C:DC:F5:42:6A:EC:BB: 0F:B5:F0:9B:02:21:00:DF:96:F1:A3:22:64:66:CB:B6: C1:1D:84:1D:D3:41:C5:DD:C0:D9:6D:19:BC:EB:AC:94: 65:49:6F:CE:DC:65:AA
-----BEGIN CERTIFICATE-----
MIIFHjCCBAagAwIBAgIQTcRSvG78wuEQihqu3VZ8ozANBgkqhkiG9w0BAQsFADA7
MQswCQYDVQQGEwJVUzEeMBwGA1UEChMVR29vZ2xlIFRydXN0IFNlcnZpY2VzMQww
CgYDVQQDEwNXUjMwHhcNMjYxMDI3MTk0MjIwWhcNMjcwMTI1MjAzODE0WjAbMRkw
FwYDVQQDExBkYW91b2ZmaWNlLmNvLmtyMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8A
MIIBCgKCAQEA23w1/nX/YdxcBOv3SgpA99Ua7fRPjbqntbuhUUgeKwLh6z2P27mB
0j+olmj4R0BE77OIlpdAumqkaDguTSYxzPhm19RuQEwwdHz64CSgI8t2+l48NfQa
36otaG5rwpw6v+5P6mJ/u42tahfXLe8hv6MLakT+0w+9ZrRsOz2zbJ/3dESKAqM4
so/DCuGjbwT5Ak+ppZMrLgiutc3bdZNnsx6t7M9AD9f012v9VyxrrdTLZACrBo1S
9W9QMfUmW/+pFXyLpoOzhT+7bRwN+USX4o6QXlXu/Lq0G0QQZxPe2DjBb2PL8hn7
PElk3BiMRUNBbyN34WYbktOuQsuWS+uEFQIDAQABo4ICPDCCAjgwDgYDVR0PAQH/
BAQDAgWgMBMGA1UdJQQMMAoGCCsGAQUFBwMBMAwGA1UdEwEB/wQCMAAwHQYDVR0O
BBYEFKIaIDIi70i+PRq9UliBlkg2HxXBMB8GA1UdIwQYMBaAFMeB9f2OiNkAPE1j
olAxJKDOI/4jMDUGCCsGAQUFBwEBBCkwJzAlBggrBgEFBQcwAoYZaHR0cDovL2ku
cGtpLmdvb2cvd3IzLmNydDAvBgNVHREEKDAmghBkYW91b2ZmaWNlLmNvLmtyghIq
LmRhb3VvZmZpY2UuY28ua3IwEwYDVR0gBAwwCjAIBgZngQwBAgEwNgYDVR0fBC8w
LTAroCmgJ4YlaHR0cDovL2MucGtpLmdvb2cvd3IzL2ZxbHViZUJSc3lJLmNybDCC
AQwGCisGAQQB1nkCBAIEgf0EgfoA+AB2AByfaCzp+vBFaVD4G5aKh93bMhDYTObI
suOCUkrEz1mfAAABoX8Zgf0AAAQDAEcwRQIgGI1f8Se9G52lKbQdQjjNFt50vc5T
xybYx2ZvVFhUxDgCIQDE8BhKNRxjw6ZZgYR1Rt0VDPC8SU74VhrgmCRHcF/NqwB+
AI7KRwus3mrzogawpHqEt0b+H8a/lT4l5ptO5AJI88boAAABoX8Zg6wACAAABQAw
LVG4BAMARzBFAiAKz6fLODvkuxPVoLbVPsdVKdVz2y2c3PVCauy7D7XwmwIhAN+W
8aMiZGbLtsEdhB3TQcXdwNltGbzrrJRlSW/O3GWqMA0GCSqGSIb3DQEBCwUAA4IB
AQBpWG1Yt4zq+L59PV2sDaBHgqoIa8NUBDqQoXivj1ql9c5/mqOBiMLLmdweucqE
920JI5ilmv3ZoOL9NYKxxDZtTEVEp7s36TWf2lhesAiRSviCO/ybLGb6iFwGr61d
AwWDNYw7Y5bxXgRrY5ZMaJoBmD8zSPtRKL+4ZF77ozM2bXo6iWJhkCy6tS83GHgD
RGe+ykMp8vzIMLrC5A9+gs6Kq65dPksuf2aFXBu6KiVFtiiVQxM16V5yUXisqy32
qehG7KBKHr6F2If+eSY/iRxVM6zs7eMcwm7FdIZCMz4vbFazlIGLVbLbXjjciz/1
arFGtjVep0EA8zmvWZCnp7sM
-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-11-06T02:48:44+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=US O=Google Trust Services CN=WR3
Issuer
C=US O=Google Trust Services LLC CN=GTS Root R1
Valid from
2023-12-13T09:00:00+00:00
Expires
2029-02-20T14:00:00+00:00
Days remaining
837
Serial (hex)
7FF005A91568D63ABC22861684AA4B5A
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

2F:E3:57:DB:13:75:1F:F9:16:0E:87:35:49:75:B3:40:74:98:F4:1C:9B:D1:6A:48:65:78:66:E6:E5:A9:B4:C7
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
C7:81:F5:FD:8E:88:D9:00:3C:4D:63:A2:50:31:24:A0:CE:23:FE:23
authorityKeyIdentifier
E4:AF:2B:26:71:1A:2B:48:27:85:2F:52:66:2C:EF:F0:89:13:71:3E
authorityInfoAccess
CA Issuers - URI:http://i.pki.goog/r1.crt
crlDistributionPoints
Full Name: URI:http://c.pki.goog/r/r1.crl
certificatePolicies
Policy: 2.23.140.1.2.1
-----BEGIN CERTIFICATE-----
MIIFCzCCAvOgAwIBAgIQf/AFqRVo1jq8IoYWhKpLWjANBgkqhkiG9w0BAQsFADBH
MQswCQYDVQQGEwJVUzEiMCAGA1UEChMZR29vZ2xlIFRydXN0IFNlcnZpY2VzIExM
QzEUMBIGA1UEAxMLR1RTIFJvb3QgUjEwHhcNMjMxMjEzMDkwMDAwWhcNMjkwMjIw
MTQwMDAwWjA7MQswCQYDVQQGEwJVUzEeMBwGA1UEChMVR29vZ2xlIFRydXN0IFNl
cnZpY2VzMQwwCgYDVQQDEwNXUjMwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK
AoIBAQCPNHWHr4RyFI0HEJFvA6zx1Ag1mhnymxiJNGyYj3rU3eoF6N4bfIxUErp5
ivsYDQ18nPO9OOSoXsYzy0aJb0ag6TdjjdzM1ZdOMq17HSMFufV7SUOY0LxXx1N4
GLHtp1SyfIa+8FRFvIe6mVkd9LjbAPuBT0YrYl6xOqUqFyOsor7FjuVe/XEefaS0
I30EUrI00t+ZrIfGTFlf+OZPjnWSwrIwRpLQtg3H5Iln/z9UlCdl4wHISiyEL2Vf
za1c/aatQVvcTD8XlpF9qdg8Uyoc0ObUd+ZDSsK3+Eiiza1jtSVrlnIdgUVvhmnE
5OZ4TDHmoX+nAXMKh++HiXLM08WNAgMBAAGjgf4wgfswDgYDVR0PAQH/BAQDAgGG
MB0GA1UdJQQWMBQGCCsGAQUFBwMBBggrBgEFBQcDAjASBgNVHRMBAf8ECDAGAQH/
AgEAMB0GA1UdDgQWBBTHgfX9jojZADxNY6JQMSSgziP+IzAfBgNVHSMEGDAWgBTk
rysmcRorSCeFL1JmLO/wiRNxPjA0BggrBgEFBQcBAQQoMCYwJAYIKwYBBQUHMAKG
GGh0dHA6Ly9pLnBraS5nb29nL3IxLmNydDArBgNVHR8EJDAiMCCgHqAchhpodHRw
Oi8vYy5wa2kuZ29vZy9yL3IxLmNybDATBgNVHSAEDDAKMAgGBmeBDAECATANBgkq
hkiG9w0BAQsFAAOCAgEAnI1DlJQzSKcWbyXXrJSsgKMo6KG74TMqhsuTg67a0FX0
2752+eiJb5YsOJc8DVOHalwpOvbuPdl5BuAEgIK4Va7l9j3J9M1/EjeWjGTM3Ros
zmBJGu82oz6EWi5q75xeF+onJmh2Hm98a/yJAI/mODXq5LofYcQ9AffKP9ZMZu+Y
wW+/qHqyX2JhaOntvl7i8S+l1Y8CcKEqM1NFK4s4EBYPRFjZDawOHX7fSchbSMVP
n5Nu04lrU6xufuZqRosEQw2o0UAyzDoyA52NXzJTWr1G2FVg/0A9hdrQ/6fe9G31
67zKxNqXErs6MpHttEouGbpm2ftzrmcvruYxTfxc4G2GwBi3LFLozNpy042gDfXB
zDyn1staWsy7+QnzMlR59Fz6jBOk5R4LT+ma0+KjnfRhMh5T2ucm69HkvNQtDZlV
a1tLUlzs0zLEdQSehTCjZ6SYsGt2bMVK6dvtxzcyCP0QDUFnNXCwgw12+mGSkAuj
4ORi8kMRpnL8UEjkNbdw9KL1eYbEC3D0GPue2Yk2AGhxkmcdm1BoOp05kYw/Nnqg
h7QV8DKyBTUHbjH0pXlLiOsSOY+CLh1eTM+Do6rSjqGnDQeUXylZmPCmuveaw38I
VnBaa6Eiz6pngZ1u6OeO/1UzfhmyTm0n0G+9JZ3KS2Mq08isNgXHLnhlHJaphpE=
-----END CERTIFICATE-----

Chain certificate 2

Subject
C=US O=Google Trust Services LLC CN=GTS Root R1
Issuer
C=BE O=GlobalSign nv-sa OU=Root CA CN=GlobalSign Root CA
Valid from
2020-06-19T00:00:42+00:00
Expires
2028-01-28T00:00:42+00:00
Days remaining
447
Serial (hex)
77BD0D6CDB36F91AEA210FC4F058D30D
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

3E:E0:27:8D:F7:1F:A3:C1:25:C4:CD:48:7F:01:D7:74:69:4E:6F:C5:7E:0C:D9:4C:24:EF:D7:69:13:39:18:E5
Certificate extensions & PEM
keyUsage
Digital Signature, Certificate Sign, CRL Sign
basicConstraints
CA:TRUE
subjectKeyIdentifier
E4:AF:2B:26:71:1A:2B:48:27:85:2F:52:66:2C:EF:F0:89:13:71:3E
authorityKeyIdentifier
60:7B:66:1A:45:0D:97:CA:89:50:2F:7D:04:CD:34:A8:FF:FC:FD:4B
authorityInfoAccess
OCSP - URI:http://ocsp.pki.goog/gsr1 CA Issuers - URI:http://pki.goog/gsr1/gsr1.crt
crlDistributionPoints
Full Name: URI:http://crl.pki.goog/gsr1/gsr1.crl
certificatePolicies
Policy: 2.23.140.1.2.1 Policy: 2.23.140.1.2.2 Policy: 1.3.6.1.4.1.11129.2.5.3.2 Policy: 1.3.6.1.4.1.11129.2.5.3.3
-----BEGIN CERTIFICATE-----
MIIFYjCCBEqgAwIBAgIQd70NbNs2+RrqIQ/E8FjTDTANBgkqhkiG9w0BAQsFADBX
MQswCQYDVQQGEwJCRTEZMBcGA1UEChMQR2xvYmFsU2lnbiBudi1zYTEQMA4GA1UE
CxMHUm9vdCBDQTEbMBkGA1UEAxMSR2xvYmFsU2lnbiBSb290IENBMB4XDTIwMDYx
OTAwMDA0MloXDTI4MDEyODAwMDA0MlowRzELMAkGA1UEBhMCVVMxIjAgBgNVBAoT
GUdvb2dsZSBUcnVzdCBTZXJ2aWNlcyBMTEMxFDASBgNVBAMTC0dUUyBSb290IFIx
MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAthECix7joXebO9y/lD63
ladAPKH9gvl9MgaCcfb2jH/76Nu8ai6Xl6OMS/kr9rH5zoQdsfnFl97vufKj6bwS
iV6nqlKr+CMny6SxnGPb15l+8Ape62im9MZaRw1NEDPjTrETo8gYbEvs/AmQ351k
KSUjB6G00j0uYODP0gmHu81I8E3CwnqIiru6z1kZ1q+PsAewnjHxgsHA3y6mbWwZ
DrXYfiYaRQM9sHmklCitD38m5agI/pboPGiUU+6DOogrFZYJsuB6jC511pzrp1Zk
j5ZPaK49l8KEj8C8QMALXL32h7M1bKwYUH+E4EzNktMg6TO8UpmvMrUpsyUqtEj5
cuHKZPfmghCN6J3Cioj6OGaK/GP5Afl4/Xtcd/p2h/rs37EOeZVXtL0m79YB0esW
CruOC7XFxYpVq9Os6pFLKcwZpDIlTirxZUTQAs6qzkm06p98g7BAe+dDq6dso499
iYH6TKX/1Y7DzkvgtdizjkXPdsDtQCv9Uw+wp9U7DbGKogPeMa3Md+pvez7W35Ei
Eua++tgy/BBjFFFy3l3WFpO9KWgz7zpm7AeKJt8T11dleCfeXkkUAKIAf5qoIbap
sZWwpbkNFhHax2xIPEDgfg1azVY80ZcFuctL7TlLnMQ/0lUTbiSw1nH69MG6zO0b
9f6BQdgAmD06yK56mDcYBZUCAwEAAaOCATgwggE0MA4GA1UdDwEB/wQEAwIBhjAP
BgNVHRMBAf8EBTADAQH/MB0GA1UdDgQWBBTkrysmcRorSCeFL1JmLO/wiRNxPjAf
BgNVHSMEGDAWgBRge2YaRQ2XyolQL30EzTSo//z9SzBgBggrBgEFBQcBAQRUMFIw
JQYIKwYBBQUHMAGGGWh0dHA6Ly9vY3NwLnBraS5nb29nL2dzcjEwKQYIKwYBBQUH
MAKGHWh0dHA6Ly9wa2kuZ29vZy9nc3IxL2dzcjEuY3J0MDIGA1UdHwQrMCkwJ6Al
oCOGIWh0dHA6Ly9jcmwucGtpLmdvb2cvZ3NyMS9nc3IxLmNybDA7BgNVHSAENDAy
MAgGBmeBDAECATAIBgZngQwBAgIwDQYLKwYBBAHWeQIFAwIwDQYLKwYBBAHWeQIF
AwMwDQYJKoZIhvcNAQELBQADggEBADSkHrEoo9C0dhemMXoh6dFSPsjbdBZBiLg9
NR3t5P+T4Vxfq7vqfM/b5A3Ri1fyJm9bvhdGaJQ3b2t6yMAYN/olUazsaL+yyEn9
WprKASOshIArAoyZl+tJaox118fessmXn1hIVw41oeQa1v1vg4Fv74zPl6/AhSrw
9U5pCZEt4Wi4wStz6dTZ/CLANx8LZh1J7QJVj2fhMtfTJr9w4z30Z209fOU0iOMy
+qduBmpvvYuR7hZL6Dupszfnw0Skfths18dG9ZKb59UhvmaSGZRVbNQpsg3BZlvi
d0lIKO2d1xozclOzgjXPYovJJIultzkMu34qQb9Sz/yilrbCgj8=
-----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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