www.davidfeldmanphd.com

Issued by R3

About this certificate

This digital certificate with serial number 03:11:1d:d0:28:5d:ff:cb:c9:e6:45:a5:e4:33:73:1c:8c:f7 was issued on by Let's Encrypt.

With 2 subject alternative names this certificate can be used to secure multiple fqdn's. 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:
  • Subscriber Certificate: commonName is deprecated. (BRs: 7.1.4.2.2)

Certificate Subject

CN=www.davidfeldmanphd.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:11:1d:d0:28:5d:ff:cb:c9:e6:45:a5:e4:33:73:1c:8c:f7
Serial Number (int): 267161286461304799925992669560280861936887
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 0e:b3:d9:2f:51:c3:74:40:97:5a:02:9e:ee:c1:cc:a5:0b:29:0b:2c
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 64:b4:a3:b8:b2:82:46:66:2a:34:4d:c8:d0:db:5e:14:02:22:ec:98
Fingerprint (sha256): 0d:04:42:5d:6a:d5:93:34:8a:63:cd:4c:07:89:f0:57:ec:26:0b:78:59:ea:83:c6:d8:ad:8c:75:f5:31:58:cc

Issuing Certificate URL: http://r3.i.lencr.org/

Revocation information

OCSP Server: http://r3.o.lencr.org

Check the revocation status for certificate www.davidfeldmanphd.com

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.davidfeldmanphd.com

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

9 extensions
No unhandled critical extensions

CA Certificate

This is not a CA certificate

Subject Alternative Names

davidfeldmanphd.com
www.davidfeldmanphd.com

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www.davidfeldmanphd.com

Certificate

The complete raw certificate details for www.davidfeldmanphd.com in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAl2/TjnyPfmMzHdeFGzRS
L5U3glIC1aCbL/plaYI9Wv26mIZPiBmjLKckloSs6kZwB0OJKQIvdoNipI7TwhBo
HZS/B8bA4TqgVxuW6rRT9Gc95zyBiNCshEtjD6AhAJQ/jtIlmbaCQyr08YvvwT6A
sFHCQt6cPxML0n5+7664lXUXS/QT5M0WsY8BwAUNiREDnQPLZB9yt6KwnRQwXmUa
dU6bCgeplurMpOgNCm7RVWXWoRDIxobuf6oUHxK2MMtRGGMa39KBYKfhqjpWkQg0
Iw8dg0cylEH6VR+l0lTlgZZr9a7ZaiybCMa+AXQyclKICW3KcmX/DkVHpvAFlL2F
ZwIDAQAB
-----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 267161286461304799925992669560280861936887
 . . . . . . . . [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 2023-04-06 21:51:09 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-07-05 21:51:08 +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 'www.davidfeldmanphd.com'
 . . . . . . . . [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 (2160 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 19117127699456868918585957669321249214737656413717283010490538281817123575057105718938689038320252538622439578152958192198561526952475045222427568802462198344967817796043248969478352691974931955497750628491537896429627115896281748819966006793872944175168189649166815927089005875897355211357460388363229081704965992276522332497437815109825492998630316601963472618170306600963613212182105765213014905970641539778821494033280901594007751513751371334926159657044958722337757454377225224872027900952088538255193970339514291357506531139942587672221510393449653602636789985958502638866923083026200593865999163584920984323431
 . . . . . . . . . . . . . . . . . . . . [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)
							0eb3d92f51c37440975a029eeec1cca50b290b2c
 . . . . . . . . . . . . . . . . [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 (48 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'davidfeldmanphd.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.davidfeldmanphd.com'
 . . . . . . . . . . . . . . . . [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 (69 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 1.3.6.1.4.1.44947.1.1.1
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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 (cps)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:22|false] IA5String 'http://cps.letsencrypt.org'
 . . . . . . . . . . . . . . . . [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 (246 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes)
							00f1007600b73efb24df9c4dba75f239c5ba58f46c5dfc42cf7a9f35c49e1d098125edb4990000018758c43fba000004030047304502205d8abe0f1d21581a9c81ab6c5884e1c3e35cc653adc15e96698e6408cf61792c0221008f17d38f2fc20f39c3a6e452e454cb44a8a67bf7f8b069eea050ed846b6118a7007700e83ed0da3ef5063532e75728bc896bc903d3cbd1116beceb69e1777d6d06bd6e0000018758c43fd40000040300483046022100fc519c9cb57b495f9d23d2c36ea1c166a8a1d40359cbbbf598fa8041e838a41d022100ebc6d72dd9a4a695cec094e73f1dfaca1e0fb0016ab992344a9b01856ae9d6b8
 . . . . [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)
		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