wildcard.dpo.a-star.edu.sg
Issued by R3
About this certificate
This digital certificate with serial number 04:e9:56:53:dd:92:2e:ae:5a:80:a4:89:3b:46:ca:9e:91:38 was issued on by Let's Encrypt.
This certificate has already expired and will cause a warning or error message in the browser it's still listed on this site to allow you to look back on previously issued certificates. If we have found any compliance issues with this certificate they will be shown below. I hope this certificate review is providing you the detailed information in a simple form you where looking for.
We have idenified some issues with this certificate:
- DV certificate contains a subject common name, this is not recommended. If certificate policy 2.23.140.1.2.1 (CA/B BR domain validated) is included, only country and/or common name is allowed in SubjectDN. (BRs: 7.1.2.7.2)
- 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)
Certificate Subject
CN=wildcard.dpo.a-star.edu.sg
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 04:e9:56:53:dd:92:2e:ae:5a:80:a4:89:3b:46:ca:9e:91:38Serial Number (int): 427849684281890690954256951552121920983352
Serial Number lenght: 139 bits, 18 octets
SubjectKeyId: 2c:18:b7:25:2e:b8:95:d6:e3:de:4d:aa:b5:d2:e7:f8:d0:a1:4a:a0
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6
Fingerprint (sha1): 6f:36:9b:01:48:a7:a4:1c:f8:05:ed:5a:e0:35:57:c5:3d:a7:87:5b
Fingerprint (sha256): 0b:c7:57:b9:12:db:3d:c6:fe:95:ec:79:a9:7f:c7:6d:e1:46:5b:c6:12:53:a6:33:9d:a3:43:f8:c1:6a:a9:f5
Issuing Certificate URL: http://r3.i.lencr.org/
Revocation information
OCSP Server: http://r3.o.lencr.orgCheck the revocation status for certificate wildcard.dpo.a-star.edu.sg
1
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for wildcard.dpo.a-star.edu.sg
Public Key Algorithm
RSA
Key Size
4096
Signature Algorithm
SHA256 with RSA
Key Usage
Digital Signature
Key Encipherment
Extended Key Usages
Server Authentication
Client Authentication
Extensions
9 extensions
No
unhandled critical extensions
CA Certificate
This is not a CA certificate
Subject Alternative Names
wildcard.dpo.a-star.edu.sg
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Certificate
The complete raw certificate details for wildcard.dpo.a-star.edu.sg in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIGADCCBOigAwIBAgISBOlWU92SLq5agKSJO0bKnpE4MA0GCSqGSIb3DQEBCwUA MDIxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQswCQYDVQQD EwJSMzAeFw0yMzExMjUwMDEyNDFaFw0yNDAyMjMwMDEyNDBaMCUxIzAhBgNVBAMT GndpbGRjYXJkLmRwby5hLXN0YXIuZWR1LnNnMIICIjANBgkqhkiG9w0BAQEFAAOC Ag8AMIICCgKCAgEAwoArzQHMEgCn8JbwHDxzv7NMVpZASlwPo2ci2l9QiIFnTpLk /4Lv6LhuFFevsZrB5wCaawfffCyBK/chirMJMKdb+QItv+lZAkk248dzNlfM+Hhz POb3bfSarM4fYt+mNuAMkX6WrpiegHTNXOqSGncP2tg7TS5W23lnhLNobItKJDHR T4ZUHiofusaauSQxfYjtBlbQtnPswIA8b+p/MyZnrBrRAo04PIR/oIqJGbUDh8vE Z8hcJONA366ia/yizp64+iyfEUL4ksHisj0jzzBDZjAN7KgSWtS1+jDjrMlkgncp ILBX8zhQSFkm3RSoEf7MYNJPJFkedK8rdAPNDftpqTNrOQVlS7YsD+l1jVlmoGab RsL2FHunsUbA3vKKEhmbC/B24ayY7PjgPnHftt2kJ6EoArrBs5bFsE675Wk7UlEG JXLm0xBieophBh/gSx42BxnOy/bBGaHSvl0jq+oKKFNCiBqDEPJjTcd4UINWIqML +61dsrYgFyJt9CqzltddLHALFffW7/FshfNStW47S4vzuclIO1ACD3/s9RtO4rkO uVG1pYt5V/thGM2rtvfBvPvB2GTAbIt5P/wjQzn9pq/ARo9d6D3+Ld7pDeKgOzlP 7UNgFT0iwp0J72ixW/haPCxDGlw6nEIrp+jzkHFshdz3WR/Yhpv+lPSv3uECAwEA AaOCAhswggIXMA4GA1UdDwEB/wQEAwIFoDAdBgNVHSUEFjAUBggrBgEFBQcDAQYI KwYBBQUHAwIwDAYDVR0TAQH/BAIwADAdBgNVHQ4EFgQULBi3JS64ldbj3k2qtdLn +NChSqAwHwYDVR0jBBgwFoAUFC6zF7dYVsuuUAlA5h+vnYsUwsYwVQYIKwYBBQUH AQEESTBHMCEGCCsGAQUFBzABhhVodHRwOi8vcjMuby5sZW5jci5vcmcwIgYIKwYB BQUHMAKGFmh0dHA6Ly9yMy5pLmxlbmNyLm9yZy8wJQYDVR0RBB4wHIIad2lsZGNh cmQuZHBvLmEtc3Rhci5lZHUuc2cwEwYDVR0gBAwwCjAIBgZngQwBAgEwggEDBgor BgEEAdZ5AgQCBIH0BIHxAO8AdgBIsONr2qZHNA/lagL6nTDrHFIBy1bdLIHZu7+r OdiEcwAAAYwECTd9AAAEAwBHMEUCIQCBkzpOv2xYuPKsmzYKFJpVL6yjOsyzVXf2 fF5IJWDZUAIgC97S4VYF0j9BLt31vA7pOQTqG3vs2W9AISqlvdUtOXAAdQB2/4g/ Crb7lVHCYcz1h7o0tKTNuyncaEIKn+ZnTFo6dAAAAYwECThdAAAEAwBGMEQCIEoe UmAfEbLkmKSoxn+xylZ+cixtPHNCis8GtvVBidJAAiB6biW5SOXfY7J67hAjqBWK EkgF60zv6fOuDt5ATWfbaTANBgkqhkiG9w0BAQsFAAOCAQEAFLRihL6m83sRX+lZ WnUCXU5FkcgKp6OrkoLWatqRgw3iW19fZwHlWBz6Z0JICuN4xOXrWOmggzldWLxE rLipIbyaA+hjozeSTx1NOOCnhzLlDAaaJA2JQyi5dw4SIItL7dOfs/80Le9CvPk8 fRzaSs03HbBXJ/X9u8+8Z/mbyYgAhznUvLP1XoFxlMPYHbnBGhUbsEuxhodUNmfb 7iNSWNc8kvDsZnQd6AxjMRXcDai2/KIDIMZpjz2plrZf5WznL4VgoapGObsg9tFx la4seEO+7axPWqBpz7V+WZrOO/JTy04NbH7SgqENTpvKLeWTvsTC8xGem6/aEfI0 tACLyg== -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAwoArzQHMEgCn8JbwHDxz v7NMVpZASlwPo2ci2l9QiIFnTpLk/4Lv6LhuFFevsZrB5wCaawfffCyBK/chirMJ MKdb+QItv+lZAkk248dzNlfM+HhzPOb3bfSarM4fYt+mNuAMkX6WrpiegHTNXOqS GncP2tg7TS5W23lnhLNobItKJDHRT4ZUHiofusaauSQxfYjtBlbQtnPswIA8b+p/ MyZnrBrRAo04PIR/oIqJGbUDh8vEZ8hcJONA366ia/yizp64+iyfEUL4ksHisj0j zzBDZjAN7KgSWtS1+jDjrMlkgncpILBX8zhQSFkm3RSoEf7MYNJPJFkedK8rdAPN DftpqTNrOQVlS7YsD+l1jVlmoGabRsL2FHunsUbA3vKKEhmbC/B24ayY7PjgPnHf tt2kJ6EoArrBs5bFsE675Wk7UlEGJXLm0xBieophBh/gSx42BxnOy/bBGaHSvl0j q+oKKFNCiBqDEPJjTcd4UINWIqML+61dsrYgFyJt9CqzltddLHALFffW7/FshfNS tW47S4vzuclIO1ACD3/s9RtO4rkOuVG1pYt5V/thGM2rtvfBvPvB2GTAbIt5P/wj Qzn9pq/ARo9d6D3+Ld7pDeKgOzlP7UNgFT0iwp0J72ixW/haPCxDGlw6nEIrp+jz kHFshdz3WR/Yhpv+lPSv3uECAwEAAQ== -----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 427849684281890690954256951552121920983352 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11 (sha256WithRSAEncryption) . . . . . . . . . . . . [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 (countryName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'US' . . . . . . . . . . . . [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 (organizationName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Let's Encrypt' . . . . . . . . . . . . [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 (commonName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'R3' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-11-25 00:12:41 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-02-23 00:12:40 +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 (commonName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'wildcard.dpo.a-star.edu.sg' . . . . . . . . [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 (rsaEncryption) . . . . . . . . . . . . . . . . [c:0|t:5|false] NULL . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (4208 bits) . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 793493497849013735370572512714601319717636116001097259913665907299540445608540735578792127874594392326462450064567655484647412532216764620666166070099820894675177982962078004395997237113575980459023751557010416611674035650221964696036622688642439624222544602849477811666230566851159308675227602772200993611823357203710362771529914337449086689839005014354066020883657316198985654770768454153121162534891860013952711451748975834921190588178386736420332599217588627515838270015904885983069924660584588711653987269022882147421362148523139436446446878410478858264658512259195823331619433857562676278008672681417996311366800497057112833382444374182033508761393176308237294570124678375495216471500726868455364566922854147259446339226400064788901788984603909415539402318863631954496491819281528763487926559031191263544272102495270472275613262817513335671083614872122205158525088098948329011334773088267457446609212042057213765001969609730355922083762712203883368436419288658606824822183652383822766062345118076454548145859087867318133856680454052286677608312297301362456784410892947582387950358923005366171480433624751447043539035170278188317734353184205878814005399980611862323273870049977364192410313784070040709956435038085862817457495777 . . . . . . . . . . . . . . . . . . . . [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 (keyUsage) . . . . . . . . . . . . . . . . . . . . [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 2.5.29.37 (extKeyUsage) . . . . . . . . . . . . . . . . . . . . [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 (serverAuth) . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.2 (clientAuth) . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.19 (basicConstraints) . . . . . . . . . . . . . . . . . . . . [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 2.5.29.14 (subjectKeyIdentifier) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (20 bytes) 2c18b7252eb895d6e3de4daab5d2e7f8d0a14aa0 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.35 (authorityKeyIdentifier) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|false] OtherName 142eb317b75856cbae500940e61faf9d8b14c2c6 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.1.1 (authorityInfoAccess) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (73 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.1 (ocsp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://r3.o.lencr.org' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.2 (caIssuers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://r3.i.lencr.org/' . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.17 (subjectAltName) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (30 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'wildcard.dpo.a-star.edu.sg' . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.32 (certificatePolicies) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (12 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.23.140.1.2.1 (Domain Validation Certificates Policy) . . . . . . . . . . . . . . . . [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 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (244 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (241 bytes) 00ef00760048b0e36bdaa647340fe56a02fa9d30eb1c5201cb56dd2c81d9bbbfab39d884730000018c0409377d000004030047304502210081933a4ebf6c58b8f2ac9b360a149a552faca33accb35577f67c5e482560d95002200bded2e15605d23f412eddf5bc0ee93904ea1b7becd96f40212aa5bdd52d397000750076ff883f0ab6fb9551c261ccf587ba34b4a4cdbb29dc68420a9fe6674c5a3a740000018c0409385d000004030046304402204a1e52601f11b2e498a4a8c67fb1ca567e722c6d3c73428acf06b6f54189d24002207a6e25b948e5df63b27aee1023a8158a124805eb4cefe9f3ae0ede404d67db69 . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11 (sha256WithRSAEncryption) . . . . . . . . [c:0|t:5|false] NULL . . . . [c:0|t:3|false] BIT STRING (2048 bits) 0014b46284bea6f37b115fe9595a75025d4e4591c80aa7a3ab9282d66ada91830de25b5f5f6701e5581cfa6742480ae378c4e5eb58e9a083395d58bc44acb8a921bc9a03e863a337924f1d4d38e0a78732e50c069a240d894328b9770e12208b4bedd39fb3ff342def42bcf93c7d1cda4acd371db05727f5fdbbcfbc67f99bc988008739d4bcb3f55e817194c3d81db9c11a151bb04bb18687543667dbee235258d73c92f0ec66741de80c633115dc0da8b6fca20320c6698f3da996b65fe56ce72f8560a1aa4639bb20f6d17195ae2c7843beedac4f5aa069cfb57e599ace3bf253cb4e0d6c7ed282a10d4e9bca2de593bec4c2f3119e9bafda11f234b4008bca