ruvodipuglia.org

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 04:fb:43:b9:72:a3:af:08:5e:d8:3a:7e:e6:79:a2:46:37:70 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=ruvodipuglia.org

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:fb:43:b9:72:a3:af:08:5e:d8:3a:7e:e6:79:a2:46:37:70
Serial Number (int): 433950038999996014524530426521537969796976
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 10:32:f4:13:e4:8a:c7:4a:3e:0a:61:87:ca:b6:29:18:f0:3c:61:24
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 3f:57:78:91:aa:6a:70:63:ac:25:94:d2:b1:01:c3:1f:ea:f4:27:63
Fingerprint (sha256): ad:bc:3e:ce:1e:58:04:33:32:c9:a7:a0:f0:ba:3c:4a:7e:43:ff:2a:90:d8:29:70:fd:6e:9f:52:7d:c5:52:11

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 ruvodipuglia.org

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for ruvodipuglia.org

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

ruvodipuglia.org

Other certificates including the domain name ruvodipuglia.org

(limited to 100 certificates)

Certificate

The complete raw certificate details for ruvodipuglia.org 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 433950038999996014524530426521537969796976
 . . . . . . . . [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 2020-04-05 09:53:34 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-07-04 09:53:34 +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 'ruvodipuglia.org'
 . . . . . . . . [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 634060759574091544688614718870528302110689647338437254882945784831053983995052147804464114215433184704860751997762664651295698076432810162781194661453511586328111299501611485091382012554126508703372227254232351964203172884521377247332790136076252113019700224100361969120720487303554549006947137091420587306042049169573149020656836146974570777215026782707714049985592680950565324458278099934779089005268646770031130796501130097429128301470322021393596258155965140714331192263208846938257343044956491321333961655214422801204976828149806990003855065306933078027291995407450143825771458380086648303287554624064596482156359216735321574302076961184882704293771042690865646126282679525220946581560658303217158412092307877308965649212197262224497336180599411402617561608668956494588622334343285604614834053249981426866549376529610907336659912989507888271446122677016366388765951726444824750303962847110020552521510731555140466610300321914233870201974045888609266929461411771965786180457886296772922199873101791103313248524453624051339711757305686142155779680015466304391509359147444058041087631555704045604223628090230877166288951827350498608402172701965621810730941645640580290829305892102556859250748027206010571676745594196462120558600617
 . . . . . . . . . . . . . . . . . . . . [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)
							1032f413e48ac74a3e0a6187cab62918f03c6124
 . . . . . . . . . . . . . . . . [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 (20 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'ruvodipuglia.org'
 . . . . . . . . . . . . . . . . [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 (247 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (244 bytes)
							00f2007700f095a459f200d18240102d2f93888ead4bfe1d47e399e1d034a6b0a8aa8eb2730000017149f96b7b0000040300483046022100d46283b100ab992f2a0a8f912df60b88f55cad1ca99fcf6eb58bef398b31fd67022100fa96fac5344922d1d2b02fb78fcdf619f168ab48987e7833fb66b1b338a8697f00770007b75c1be57d68fff1b0c61d2315c7bae6577c5794b76aeebc613a1a69d3a21c0000017149f96b9f0000040300483046022100a4bf581dc5632e084b46123afb8a318bf6c22c6a524a8aa66167e7db7fe0551e022100a2466a991f8e50e596e8f91fb98a3e27af27fe0b0da04b14dc993690cce7b877
 . . . . [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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