748.me

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:a2:82:c2:09:f1:cd:bf:07:4b:a1:54:89:9b:73:e1:fb:32 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=748.me

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:a2:82:c2:09:f1:cd:bf:07:4b:a1:54:89:9b:73:e1:fb:32
Serial Number (int): 316636408383214714806075172307953692834610
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 33:2c:3f:86:7b:57:79:49:e7:6c:8e:fb:9c:9a:77:88:d1:ae:13:3c
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 56:9a:0e:1e:e0:6e:aa:8d:d5:50:64:fa:17:a3:c0:e5:45:b0:bb:5e
Fingerprint (sha256): 63:ba:45:60:97:4c:66:ea:e4:d0:8a:a8:7f:d5:58:fd:33:d8:f1:5e:0d:ef:76:bf:a9:03:9c:5d:1d:d3:94:6f

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 748.me

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for 748.me

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

748.me

Other certificates including the domain name 748.me

(limited to 100 certificates)
organicmedicalmarijuana.clinic
748.me
www.748.me
748.me
748.me
748.me
www.748.me
748.me
www.748.me
748.me
www.748.me
748.me
947.me
musey.bible
www.748.me
748.me
financialfreedomsteps.com

Certificate

The complete raw certificate details for 748.me 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 316636408383214714806075172307953692834610
 . . . . . . . . [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 2020-04-04 23:51:20 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-07-03 23:51:20 +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 '748.me'
 . . . . . . . . [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 851958995101020178364132737304926966647253225626649644941855004296720118178107033508523441376368636173177012326336577822093402084275809623338345797048811721834939374523936660196047023870894278918006130360796834719733452742177567024497127192658428859727125421427054960065018601743933567969060340933901607849675322222041552432259189314708472915461244917328642316918105091681251927078723234676319414563235103791623482177079012819330683804830622385612689813817484364845432142153729618137473549643597993262452285560606244966447584100318121664446507406446315157056699634122273152561056575227868185662932921834115638896310450667402513409222201643240513767510208594639078625099055205631834324144122742864386303985035168342466564150846794621122049080373442102199204196434411811941042547025104968736075999266331974929670442251155163616060709579189570438896823942431834251957547457091362928128903868528116683112936454859240719773836418442990422495635144582294375680121612174791372948793838614771226411215550713804889335024682163519032242944160233897679933689891118177869333759846189875862518451367576378516664000959546162511253382400207661052561376382987202615318452885582295716108264281375295477633855781588483474463553129320230180249890394401
 . . . . . . . . . . . . . . . . . . . . [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)
							332c3f867b577949e76c8efb9c9a7788d1ae133c
 . . . . . . . . . . . . . . . . [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 (10 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String '748.me'
 . . . . . . . . . . . . . . . . [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)
							00f2007700f095a459f200d18240102d2f93888ead4bfe1d47e399e1d034a6b0a8aa8eb2730000017147d20d110000040300483046022100d86d89910de92aa4107b930300d71fc05c9f7492818b569ba306a70cca267903022100e4ef09ed85d2f9669b7e0bdefecb45d09532361d8f4d28f636b4bd8bea7ff38600770007b75c1be57d68fff1b0c61d2315c7bae6577c5794b76aeebc613a1a69d3a21c0000017147d20d410000040300483046022100d93a3c5a48757dc12a7f25d2421894ed84d4b1d4d2e3bbf9c5b36479ccab9b5302210084b9c6d4e19c4c360835d3be33c832ceeaddb2799d30ad70cfcd768cabaac8b1
 . . . . [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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