www.centrotutelaminori.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:90:15:cb:65:60:20:ea:d9:ed:cf:25:e3:af:4e:75:06:27 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.centrotutelaminori.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:90:15:cb:65:60:20:ea:d9:ed:cf:25:e3:af:4e:75:06:27
Serial Number (int): 310366488512209105490221707424936240678439
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 31:bf:d5:6f:eb:2f:b1:ad:3d:9d:67:3f:f7:12:13:66:69:ff:7d:41
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): ee:97:e9:b3:fa:ee:f9:cb:0c:73:62:00:1b:93:0e:17:ba:86:92:d1
Fingerprint (sha256): ca:dd:76:b6:ef:9c:e8:4a:07:0c:69:ee:ad:03:1f:e8:ed:76:88:90:84:82:e7:18:9a:82:5a:4f:d1:01:d9:e2

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.centrotutelaminori.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.centrotutelaminori.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.centrotutelaminori.com

Other certificates including the domain name centrotutelaminori.com

(limited to 100 certificates)

Certificate

The complete raw certificate details for www.centrotutelaminori.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 310366488512209105490221707424936240678439
 . . . . . . . . [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 2019-03-23 19:01:32 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-06-21 19:01:32 +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.centrotutelaminori.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 780595986993035079854642476748437264446089288257596573820381759135815583783812771404697867461599027462751145956352807895007696473184284334843958944334352412916621280741168048245321940815871247998213925470974361195780999271007052472373883536678290943319309780283313325134106630837125310327391584609831821865698102427499414103756464008299763606374664867404688191926688969058801176659040707897221839025134241407680361613554584463893503971601932061219100124559054612196680346813106448729730402858157604464006230492742201540037773740997479133115695404138368364117065785306811922799314227949816868429333977037563944767333137366617124518337949095913883649072048091637258868350468490909857567017157517284983633180362135798870176308247706967414020031800246623510713222246904760155867607976700183613359143287475447689865577910581684378486279130297692341306082393392191324351875402404241299179646806565686144849853379300915991301673502008391139625972190254094991736694603165955113917541228507464778315857817328959539467527877180217245143677972876269619636562179495767587098731694196900241818428005721962066817976618537161072271107035300046964538428107068152020545772475305873464512522701600033283038624364892778010748574286065616782434530118109
 . . . . . . . . . . . . . . . . . . . . [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)
							31bfd56feb2fb1ad3d9d673ff712136669ff7d41
 . . . . . . . . . . . . . . . . [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 (30 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.centrotutelaminori.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)
							00f0007600747eda8331ad331091219cce254f4270c2bffd5e422008c6373579e6107bcc5600000169ac24e2a80000040300473045022100d219e90c3dd7d321394ed01f536078c202a9f01925f8407c6fd8a4ebf02c5fbe0220621ba2689bc88acabdc0eed146afd6d6010f247e82b97c17077b1969824b78c5007600293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f47800000169ac24e31b000004030047304502204d3e2587e804534926afe8b3cc4b30135b918b2db7064126e9a5e2020414eb95022100b6003e1ba89abf47913c74b07c41809bfac1be8857196afd2eee58c0ed30f2cd
 . . . . [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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