www.birori.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:d8:14:ea:46:52:97:68:03:37:40:15:4e:01:15:f3:ff:4e 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.birori.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:d8:14:ea:46:52:97:68:03:37:40:15:4e:01:15:f3:ff:4e
Serial Number (int): 334865650033896283076824922431418839334734
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 4b:40:62:7e:8a:cf:84:bf:e1:7e:54:c6:ac:5a:b0:ac:bc:30:73:bc
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 6d:af:7d:db:0d:f9:6f:2a:7b:b4:ff:75:3e:41:6e:57:ab:3e:b5:77
Fingerprint (sha256): f7:4e:cc:15:f3:0e:2a:1c:c0:cb:d2:3e:2f:ec:72:d7:5e:49:61:90:0f:51:95:8d:a3:e6:66:25:67:f6:0c:95

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.birori.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.birori.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.birori.com

Other certificates including the domain name birori.com

(limited to 100 certificates)
birori.com
teutonix.com
birori.com
birori.com
www.birori.com
cubasignlanguage.bible
birori.com
35451.com
birori.com
www.birori.com
birori.com
birori.com
www.birori.com
birori.com
www.birori.com
www.birori.com
www.birori.com

Certificate

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

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAp2zf1YCYIga/9p7hEsSl
rvWKqZRr2Jkv1d/9gW1L4NwIIAYpxb7K6tG4iMaQo0HmXUY5+jxldvwrGwZaolHr
Hg5nQDbGpBPqPGtzFxWZ0G6zQgl7toL1LKdt72itwCXP5cdbz+zEZnABP0KfzYZX
4WZgjyn3R76Z9blv9VCM0JowR1oxELajNu5kk0YN/j2uxKesMjPvMomXoY1TL0vf
TnGfr6yf/w92q3txugJ/kwMNsg30foDrUa69Y0Is+Yz21LDOxUpfezxVX9Ad9pV9
pBr9OczzhvV+xlVE2m3QxODAP0YlRXcwlDmnZbtpECnnmpoxBs8IMFh5PUG49muv
g89/5ify/15CFOb2ZgBbrdizQjf8UsVkAnWDODJpHbUyZQE2WtkvRpzVxTyDIsu0
1k0fBAPI7QHg21bMupewUiOUB5cTPJvpnbonmQvdpYzSHC8j4pyTQiEOoIjQA48d
A9T8eS8nHbJcEijs8bIwekyOgARtaAveFTBAFeNjAr7Gy7w98SV5fnv21u4cf9K1
36F03mf+n+3gQcaKZ+aRcFZRCofyoQOMKxFnVRKAXrqyekI7A+ze8vrzkbfz74Q1
VipmvGcuzUIOZPtyISNE05rhmH0XWlB3QEH08N12mSztgZef4NcwC2Z2Ovmqq1LF
7HVE8a1Zvj6L8tBFBWb9JfECAwEAAQ==
-----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 334865650033896283076824922431418839334734
 . . . . . . . . [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 2019-08-28 13:24:19 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-11-26 13:24:19 +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.birori.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 683035592962513530389947807669506335110006772510825311651822398013819968948367717098487138004410489351188644314294742222608806108061411213656254775751977768070084235174983822545348296977874784830725785504070412005612638810775157685837103145117977586450675751819674385029740134857631951341041436608659804335913836702441724638091946119109741562375291639981794276751670168200514835773186499465715849133736581818552131724400459391890394894551491002541620497526040530267802437012387631884895582905752217446032013352240412039198824595307533284325193956214457616255417002219734784121652454767721469755576050325838976821564609185865794752501513647672887740299889981642937952042663068939222717401679385638375065885361915698934856158182438111310242556573474499420843325687550972039913258969145665117879846009480959438474618576812555760033750795362490005987813938985019600238361959010142793285071336776999614039944460013250311735980355253187647910830326701809640377207829474457711467462716510612825362498142378921667202852482020127518239875241438146575350845055788609042466525622720111150243890456292858735251345780779307704633010558408908533163655307653596255673536114104672919657496000450427293355449655729442904003727520291834512630882313713
 . . . . . . . . . . . . . . . . . . . . [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)
							4b40627e8acf84bfe17e54c6ac5ab0acbc3073bc
 . . . . . . . . . . . . . . . . [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.birori.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)
							00f0007600747eda8331ad331091219cce254f4270c2bffd5e422008c6373579e6107bcc560000016cd89cef700000040300473045022100a20b7b50227f1ae7bf4b5fc8f8844c93e5fcfa034df5ab8d528ce5f25ce54db50220032be38751690ef23fb0cefccb13f5a6110a249c7c2b1b472653a97c8b9f445500760063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d0000016cd89cf1820000040300473045022100fec987f334769bb00ed5c9dec7088487d0932fc248e2a43e1395344a3a6177f202206c1a4417246fe846a3b1e3f89ffe630d46026a24e6f0b463d542263d25fcb01d
 . . . . [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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