DV SSL/TLS Certificate for support.ntu.ac.uk

Certificate is witin its validity period

Issued by GlobalSign nv-sa (GlobalSign GCC R3 DV TLS CA 2020)

About the support.ntu.ac.uk DV SSL/TLS Certificate

This certificate with serial number 19:a3:87:62:43:7d:b2:4d:28:3d:7a:58 for support.ntu.ac.uk was issued on by GlobalSign nv-sa.

This DV SSL/TLS Certificate is currently within its validity period but we haven't checked the revocation status of this certificate, you can do this simply on revocationcheck.com. We have found some issues with the compliance of this certificate, they are be shown below. We hope this DV SSL/TLS Certificate review for support.ntu.ac.uk provides you with the detailed information you were looking for.


We have identified some issues with this certificate:
  • Subscriber certificates use of Subject Key Identifier is NOT RECOMMENDED (BRs v2: 7.1.2.7.6)
  • Subscriber Certificate: commonName is NOT RECOMMENDED. (BRs: 7.1.2.7.1)

GlobalSign nv-sa

Organization: GlobalSign nv-sa
Country: BE

This X.509 certificate will expire on

Certificate Details

Serial Number (hex): 19:a3:87:62:43:7d:b2:4d:28:3d:7a:58
Serial Number (int): 7934819486250157116323887704
Serial Number Length: 93 bits, 12 octets

Subject Key Identifier: da:9d:ea:72:4c:0a:39:7e:cd:6e:f0:c3:bc:9b:4e:35:d7:61:b4:cf
Authority Key Identifier: 0d:98:c0:73:7f:ab:bd:bd:d9:47:4b:49:ad:0a:4a:0c:ac:3e:c7:7c

Fingerprint (SHA-1): ad:f8:11:f2:bc:5c:ea:36:7a:67:ec:55:43:fe:24:d0:bf:d7:02:14
Fingerprint (SHA-256): 29:9b:52:52:14:24:54:81:60:f6:d5:90:b7:aa:81:19:8c:43:36:23:bf:4c:88:32:14:b6:2c:89:63:a2:d9:17

Issuing Certificate URL: http://secure.globalsign.com/cacert/gsgccr3dvtlsca2020.crt

Revocation Information

OCSP Server: http://ocsp.globalsign.com/gsgccr3dvtlsca2020
CRL Distribution Point: http://crl.globalsign.com/gsgccr3dvtlsca2020.crl

Check the revocation status for certificate support.ntu.ac.uk
1
DNS Names
0
Email Addresses
0
IP Addresses

Advanced Certificate Properties

Technical details of the X.509 certificate for support.ntu.ac.uk

Public Key Algorithm
RSA
Key Size
2048
Signature Algorithm
SHA256 with RSA
Key Usage
Digital Signature
Key Encipherment
Extended Key Usages
Server Authentication
Client Authentication
Extensions
10
CA Certificate
This is not a CA certificate

Subject Alternative Names

support.ntu.ac.uk

X.509 Certificate

The complete raw X.509 certificate details for support.ntu.ac.uk in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAsb8HfR6HSbou6IUoU5Wg
h7aIguwBCl7N8Q4P8UJ0KwhSGPHFTER/UpsXZo07dHssRhgXA74eKMvOSCsIlVA+
LYf51FwqgquVy1EG3hWfu7Gi6neFR/6eYLcbJP8tw37QAeNpd3w8WsDIXtvTADXi
kuBTQF35AzNIvq47GY73Kdwqu7dwee0sSfofwnau/GO0eLT+9lsSs74SE0ytI+DK
G0YwsdTF7CJGD3xDGyyyL92GKM3CrUrZG8EJvakrKiDfOvrjP9evaQgeQ2BgJzza
2T8ddqLPr+3WEXc83NRRyEMdeD9SuX2qegDFnW/bNeqzFt1Jo0qxK3+jl/kMfhnD
UQIDAQAB
-----END PUBLIC KEY-----

ASN.1 Decoded

 [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . [c:2|t:0|true] OtherName 
 . . . . . . . . . . . . [c:0|t:2|false] INTEGER 2
 . . . . . . . . [c:0|t:2|false] INTEGER 7934819486250157116323887704
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11
 . . . . . . . . . . . . [c:0|t:5|false] NULL []
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.6
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'BE'
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.10
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'GlobalSign nv-sa'
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.3
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'GlobalSign GCC R3 DV TLS CA 2020'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2025-03-14 16:13:34 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2026-04-15 16:13:33 +0000 UTC
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.3
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'support.ntu.ac.uk'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.1
 . . . . . . . . . . . . . . . . [c:0|t:5|false] NULL []
 . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (2160 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 22438380014489778807027616279196401443783145269247506187872607842473540528335487067627362945786622497069362612483559262519882837319431919738081743043122169433248181645058326245197505483162666702740124162643874041831652422939700846729035733488392526166093806958769303051942262287888034247411618737766055520435839978134253870958389968995010478208495085874684792967532123146372509177961087563026120230528435775990448021492930076001704949172093337108592870141308995242027929961359979595886586945339653496817184031188632190240062184030661036480423606618038546788047786023360769729570823590540900542437443386169989900387153
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 65537

 . . . . . . . . [c:2|t:3|true] ORAddress 
 . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.15
 . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN true
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (4 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (3 bits)
							05a0
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.19
 . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN true
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (2 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.1.1
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (134 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.2
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://secure.globalsign.com/cacert/gsgccr3dvtlsca2020.crt'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.1
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://ocsp.globalsign.com/gsgccr3dvtlsca2020'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.32
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (79 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.4.1.4146.1.10
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.2.1
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:22|false] IA5String 'https://www.globalsign.com/repository/'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.23.140.1.2.1
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.31
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (58 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|true] OtherName 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|true] OtherName 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://crl.globalsign.com/gsgccr3dvtlsca2020.crl'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.17
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (21 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'support.ntu.ac.uk'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.37
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.1
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.2
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.35
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|false] OtherName 0d98c0737fabbdbdd9474b49ad0a4a0cac3ec77c
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.14
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (20 bytes)
							da9dea724c0a397ecd6ef0c3bc9b4e35d761b4cf
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.4.1.11129.2.4.2
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 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (361 bytes)
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 . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11
 . . . . . . . . [c:0|t:5|false] NULL []
 . . . . [c:0|t:3|false] BIT STRING (2048 bits)
		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