www.redeff.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 04:e7:1c:63:e5:d3:79:59:36:4d:33:c0:98:73:cc:06:1a:73 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:
  • Subscriber Certificate: commonName is deprecated. (BRs: 7.1.4.2.2)

Certificate Subject

CN=www.redeff.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:e7:1c:63:e5:d3:79:59:36:4d:33:c0:98:73:cc:06:1a:73
Serial Number (int): 427092107568475241302672212731915164588659
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 31:a2:34:0a:05:b8:dc:d2:f5:6a:e3:50:09:69:c6:28:55:c0:7c:1d
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): e8:cb:50:b3:0e:3a:f1:e2:ff:93:f8:00:72:34:d8:52:2b:18:81:7e
Fingerprint (sha256): a2:f1:d0:44:40:df:50:78:e4:0a:8c:53:07:b8:86:0e:f5:72:5d:1f:48:28:a9:91:5d:f5:40:42:94:f1:73:36

Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/

Revocation information

OCSP Server: http://ocsp.int-x3.letsencrypt.org

Check the revocation status for certificate www.redeff.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.redeff.com

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

www.redeff.com

Other certificates including the domain name redeff.com

(limited to 100 certificates)
redeff.com
imperialism.exposed
www.redeff.com
www.redeff.com
redeff.com
emozionata.com
www.redeff.com
redeff.com
www.redeff.com
redeff.com
redeff.com
redeff.com
madelynn.org
redeff.com
redeff.com
www.redeff.com

Certificate

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

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----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-----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 427092107568475241302672212731915164588659
 . . . . . . . . [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 'Let's Encrypt Authority X3'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-03-23 09:27:40 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-06-21 09:27:40 +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 'www.redeff.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 (4208 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 681187596736444060064567141135382525981962355755942397330234722122005204518274992519690334904453787589665174830469486979177424019268759126810103994276299857385008801350346310543832275512342968852364804041593781405934267181722645287879246325939011167577883345192970309109462438890611019639056626030119692733017793474128883128160262804856163757180149865420486122477989681820529768082512701799339859049769124058707546957129509511311404943454968675798562726651441187608097326056066716401146945800600027934894557368524309915118988110857835915359904358476107378145065422720774017079290365447420302327552065792862780032880670510417777566571405695533747294953797759542121945019192436559346873280690189043742166641581702511493647434751128385683135230871271654787726261787439355524092995318231638640690741354090090869763873765412602638751175465503127448728352946611634566647699980348320354353546270174141465192246286409064218209511002263805132557112386979276257897956040565877152112026595864882116142562456076064577659424771779330663811139696360697136774575143052848010956225521132213027135026039062215608848468271521053940467363317154542477768756476003922038569483292199172663054919642006476300029871717099203085624209809480585906418737172163
 . . . . . . . . . . . . . . . . . . . . [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)
							31a2340a05b8dcd2f56ae3500969c62855c07c1d
 . . . . . . . . . . . . . . . . [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 a84a6a63047dddbae6d139b7a64565eff3a8eca1
 . . . . . . . . . . . . . . . . [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 (99 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://ocsp.int-x3.letsencrypt.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://cert.int-x3.letsencrypt.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 (18 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.redeff.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 (245 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes)
							00f0007500f095a459f200d18240102d2f93888ead4bfe1d47e399e1d034a6b0a8aa8eb2730000017106ef0720000004030046304402206826af362efcb735bccd8e4d4195e27896a8f9fc63dca0e55297490b827fdf34022051b2170031293d97e22307e54c69b9817554eb185ab04d810c53651703d9cbad007700b21e05cc8ba2cd8a204e8766f92bb98a2520676bdafa70e7b249532def8b905e0000017106ef071c0000040300483046022100a1a842233eefedab97cf60226041a53f04afe4be35ec5a25b5305fd74e114fec022100af9d9a95545917b3c49b31bda153792f2b4914f6ca51f39bcb9d6eb98b985afb
 . . . . [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)
		00842cd0313abbe236c49b29f15eaa301c121950c6a0b38e2fd6cd64658c4cc760fd4d45690364f71c32206c724b3c7433512509cf15810c0ed3cb409f47d67397545d240717f697819eda6fc3dc7534a6da1c2f72fb0c85f2d818c79b1aab1e6b28588cb194785596aefbb710db5406fd6248a91a776c527b525bf9f14ea25a1589c3f3a30d11f37aa6a8ec9e6a144bda91fbb823f700198475d6e2b9417cdadf474360bc0c4c214d8006e82cb7454ef77067521b7b64b436b23cc6fd98a73b6701a87e6a318379bec204acc5a00bd70ce5644c4f835588c4cd53fdbd6170db09df309ebe99972106635f24df798534f5845b1ba0c1a6aa4a6dc12c3fe6b6b1f1