247medical.co

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:40:73:3c:44:6c:9d:32:a1:8b:8e:10:89:6c:3b:eb:ee:44 was issued on by Let's Encrypt.

With 2 subject alternative names this certificate can be used to secure multiple fqdn's. 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=247medical.co

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:40:73:3c:44:6c:9d:32:a1:8b:8e:10:89:6c:3b:eb:ee:44
Serial Number (int): 283268103423356723972131730222016979791428
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 46:ca:f6:29:7e:10:f2:dd:22:58:e7:b5:d9:3a:74:80:14:e6:ae:ab
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): a9:c0:33:54:97:27:4f:f2:56:9d:47:6b:37:18:ef:71:9d:17:ea:16
Fingerprint (sha256): 8e:32:d3:03:ba:2d:60:24:e0:84:f0:f5:d9:29:af:58:3e:87:fd:a1:e7:a0:eb:34:5f:e7:fb:b1:18:bc:de:b8

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 247medical.co

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for 247medical.co

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

247medical.co
www.247medical.co

Other certificates including the domain name 247medical.co

(limited to 100 certificates)

Certificate

The complete raw certificate details for 247medical.co 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 283268103423356723972131730222016979791428
 . . . . . . . . [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 2020-03-15 02:21:45 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-06-13 02:21:45 +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 '247medical.co'
 . . . . . . . . [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 946339387287920054081726376938203436687076222381921401583280251579936327799808389707047512736637149830324303756650854530304981346918860064439578357101689986612123741063190547117854713878615624036568225249747495311593954123401261060086699372437259946701693688319537633031895310272889020220532660330540502004288226455577543918178575656537777433133274529710650828647777365337842181215684416361108377172816705534837403571176204742786575728659694295885279130966205432753540119875561925809441610917928606521248854339413485976555900878487585344672774685092677607163287140728991039980734390293615074070052808422973804443624606430732900844242669550357135917465264723494032192796757550195755852815408865166437245000492561159573927287139764810788572964494166162484400803816664913794945992227456882434566307613816853253791517110623827095293732801446551423229979722113759540046453389702641093524757680318536517996642961643747559112733352539405899649520541460686673254513034077762914410349016026227990158073472634733793239321464217872497925516081510445384538628313327657211742678423078173413099889802245757138607927009082072746999423382581507314702254019125234484085842560225370735842531230211196630858707194897555801079613587895101542073446575371
 . . . . . . . . . . . . . . . . . . . . [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)
							46caf6297e10f2dd2258e7b5d93a748014e6aeab
 . . . . . . . . . . . . . . . . [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 (36 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String '247medical.co'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.247medical.co'
 . . . . . . . . . . . . . . . . [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)
							00ef0076005ea773f9df56c0e7b536487dd049e0327a919a0c84a11212841875968171455800000170dc3637ae0000040300473045022100baa40a915f8a2600382cd674b0358065927c91a109a856fd92676156fcab16710220692262bb90142d9b23a063ab809e9602cea4f6fc3427111f05b3adb23a9218c0007500b21e05cc8ba2cd8a204e8766f92bb98a2520676bdafa70e7b249532def8b905e00000170dc36379e0000040300463044022063553dbcff8d2476ba4f2d149d5f61b9805a30a5ebe666e9ec9d2ad234fbc0e402200872174aed7a55f6c8d9bebaf237aa710ce58592ba00a771b17eadad1a320806
 . . . . [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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