www.eastridgerealestate.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:ce:58:c0:59:ea:2a:9b:3b:98:aa:69:44:52:73:60:f0:e4 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.eastridgerealestate.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:ce:58:c0:59:ea:2a:9b:3b:98:aa:69:44:52:73:60:f0:e4
Serial Number (int): 331552996189307005485733947013238123196644
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 06:27:b3:71:b9:46:83:54:0a:df:13:87:b4:85:34:f3:3d:a6:f6:25
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 4e:6f:f7:6b:22:54:b1:ac:1e:df:79:26:1d:8f:05:75:6e:be:10:8b
Fingerprint (sha256): c3:16:0c:3f:dd:cd:be:bd:ac:c4:b8:d6:13:f7:5a:c9:cc:8a:12:b7:c1:94:10:73:e9:2d:b8:da:e3:33:68:3f

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.eastridgerealestate.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.eastridgerealestate.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.eastridgerealestate.com

Other certificates including the domain name eastridgerealestate.com

(limited to 100 certificates)

Certificate

The complete raw certificate details for www.eastridgerealestate.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 331552996189307005485733947013238123196644
 . . . . . . . . [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 2019-09-17 06:19:38 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-12-16 06:19:38 +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.eastridgerealestate.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 881540745841986604983803922233170321344740396245941106378015793927334637840639885205833981475221553571517832986355111185873406784744518070413210254863146047708626731556865297608515656294242065008896257381186859132402640208816856916925076716223897505844756865948117880789965563840068860620754022697910703269254004834532622904391277227917407722121206753877513055193657420100954201264417815202228766196107278086386366190900786232029470462869187329130376910241794800016885317592275581842311502910468319623426770377475545994759396890907888939651845326264890372957807685784106023294456452567966423204647322825278021009944307317855796289168414185449650598870004023111362694272223134292236081300409168210465283074002144004713864054748185214884495046734400075417215855170951900464734238315175898139117587403760454099016332347380118977317210751606553312543149216190115015250963566682851681298450620126398222000126143816233177853334836680973228339130676634161178568154337086226874276927752222332523142574533337747033676861093997706474493506725645758150275125598467613884296468837585113967205950873791433156688842671790529983363371035063746801770353782671854601279226516971880323788965874916118253633606122624805463662020897228094625367369676467
 . . . . . . . . . . . . . . . . . . . . [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)
							0627b371b94683540adf1387b48534f33da6f625
 . . . . . . . . . . . . . . . . [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 (31 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.eastridgerealestate.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)
							00f0007600293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f4780000016d3e175216000004030047304502205549a60b7234150746789166293a99d4b6f6eb93ec782a1907ff1389b010f3150221008ab278121a01707e8cd8bee8d53d5361a8472eccb64489fa0c6698bec3df3e0d007600e2694bae26e8e94009e8861bb63b83d43ee7fe7488fba48f2893019dddf1dbfe0000016d3e1753ed0000040300473045022021248d4e37a4978e0b93230581c420564e842500df28e0bee80779cc5b478e24022100ec7d2bf8e539b9ae99937aa5447c079ea8e535bbe827ec2ec3e11a83a41ea366
 . . . . [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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