www.545.me

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:87:ed:b9:43:70:bc:99:78:ac:39:f2:93:4f:5a:67:56:64 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.545.me

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:87:ed:b9:43:70:bc:99:78:ac:39:f2:93:4f:5a:67:56:64
Serial Number (int): 307590966307380652876034082538929812624996
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 5b:fa:21:8f:03:1a:9e:cc:c4:5c:3d:40:b6:da:f9:70:ce:3d:e4:aa
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 42:be:00:86:a6:e6:aa:79:3f:3e:88:60:2e:14:a6:0a:81:9e:04:7f
Fingerprint (sha256): 97:63:c8:56:e0:f4:f3:95:ac:b6:9f:5c:85:7b:73:dc:61:7f:b0:a0:e9:eb:b7:0f:f4:ac:57:b4:cd:ae:ca:a4

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.545.me

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.545.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

www.545.me

Other certificates including the domain name 545.me

(limited to 100 certificates)
545.me
kituba.bible
545.me
545.me
www.545.me
www.545.me
384.me
545.me
www.545.me
545.me
www.545.me
545.me
www.xn--8dbbm5a2afc.com
www.545.me
545.me
www.545.me

Certificate

The complete raw certificate details for www.545.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 307590966307380652876034082538929812624996
 . . . . . . . . [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 2019-07-28 14:11:26 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-10-26 14:11:26 +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.545.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 707576506292662892945051041972645811077553637585459153510528891787364567821543355157597293659071061281098558940788035022056234223855209331878362042401079026926063302606803691189303394825927860027733015697754049204507107228086161734059392273414191391963565680836093045227156750365228731658379401977399151673674271040271861717471001845557858016641631216052112329586030999306958775542296831852235068489764427490521965335454862789644371625589659874125415069082224736223910220814520001124288735007941924340319637887778474695553646043894402196679994881447761592243097885708268217508740501467714561031475057060829403563680783489771093596272962299301539903725706717184526758163828993226275930533674840098171653608823014396026696336303811485770369383520757028564374964961409409286934657150703999909867115084903739490369616058911502278802380477522245511275617717055926761624997871129699281667141517345751609470580604644184874706967614711994603297315747926820648467543153048120372941091599558893474225812849720560296038891661151079413085257418324202892137170629118754214560299096331940415859694959537537091726143850907005271971450121397026047995549885812451484685025610512341968292908729791171433647515039834910602012192452293767085705363605017
 . . . . . . . . . . . . . . . . . . . . [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)
							5bfa218f031a9eccc45c3d40b6daf970ce3de4aa
 . . . . . . . . . . . . . . . . [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 (14 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.545.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 (244 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (241 bytes)
							00ef007500747eda8331ad331091219cce254f4270c2bffd5e422008c6373579e6107bcc560000016c3922ef0c000004030046304402207f20a055f586c7df3a09bcb4ed2a4c0f9e1c3b60ad8513aecdafcccb6f035a2402203c12252ec1019cd78f6dbfe1bd1bad5d886130e4dad8e3242141221825da353500760063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d0000016c3922f0ee00000403004730450220072ce9e63958ad1bd5f094252f1883618394ae5949f1c4321423d7229d5244ca022100937a4236a14298b945f0ce3f70c7fd60ff7690d6ac65d338c9d7d637e97d8775
 . . . . [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)
		0094dbb800386a7ddb1e686412ac6bbac636b61d0d29ec13e4d3733dcd771c97951470116e3ec67d4fad2eedaeeb0d277c2b11dc6ae54e9b7faa51b3e5f17b041e44d893e838be48111d3951dbf7053c227df1fa7288cdda76e23049ea2d3690821f85683c629d2ae07de8aae1cf54c704301c700102d77790ad6b967819233f247bcda88905fb8a17f5dd9251b6023a37645a70f9882b0504a2cc0e7e03abed822e82c731e50dd5b3a3cc8ba09fa2f831aa64ec45293df9331a532acb9d5646c05275ffc62cc5e2bdfce32a92b9d7a2d133fa3400837206238548f830f8a2021a1c521ad45e39595fa17c9700f2f05c3d17168ae2099684f9eb3bed6ad11fdb2b