www.medicsuperstore.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:b7:f5:98:a6:0f:1d:98:01:a3:12:df:54:29:00:b8:9a:2c 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.medicsuperstore.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:b7:f5:98:a6:0f:1d:98:01:a3:12:df:54:29:00:b8:9a:2c
Serial Number (int): 323934984397979855909961422567628615490092
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: a2:5a:a3:7b:99:12:23:d8:59:ff:2a:7f:f1:48:d7:42:ca:7f:c6:19
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): f2:28:7d:d9:ef:60:1f:01:28:d2:d1:dc:0c:d4:8a:bd:eb:aa:70:4c
Fingerprint (sha256): cb:1e:57:7e:99:8f:ce:76:01:cc:ce:a3:da:48:2e:0b:bd:81:65:c6:92:94:78:09:64:0c:c7:c0:bd:42:95:5a

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.medicsuperstore.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.medicsuperstore.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.medicsuperstore.com

Other certificates including the domain name medicsuperstore.com

(limited to 100 certificates)

Certificate

The complete raw certificate details for www.medicsuperstore.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 323934984397979855909961422567628615490092
 . . . . . . . . [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 2020-02-19 11:40:34 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-05-19 11:40:34 +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 'www.medicsuperstore.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 760947285712221846443097169331656788679886992767125121434906581686302032562956159350619195833211570752476541479566833893529787513827712114376924020001234277440656366685943650855877843929073179567700891903650550788706272772150791098102132649266015705733948541647267102435531341014102147729679411665985001021162790939851624064783810263794989109389189187953703636418334791806565460027888962262020536056460509197408227888676585511650015118780248373405268640565601714636280066557955881775694308755563063911153034801680074356133263734249754758283717972910361771481836374160145524318018301975081269697319932693624864983022803240975117402820233200519308955223277568761494021539422933973664570114853606040225446184129671597456834105399312055873687016838423319721885627404474397646257582622903923519519982656815402594862939099172934077536018944672249047661656999110213995298247024057323864388406641331041789864857675896268449121819984742243233285282970399196422245862584293568938335269024943411361527332385946440413671447248696248643043447270741547927699222666097842124017723049238959962864308170698880223358317958430613731040252237352224214192002782962739932310668661281000884382714314579959349229108742865810912016037754379639357147212723711
 . . . . . . . . . . . . . . . . . . . . [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)
							a25aa37b991223d859ff2a7ff148d742ca7fc619
 . . . . . . . . . . . . . . . . [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 (27 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.medicsuperstore.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)
							00f00076005ea773f9df56c0e7b536487dd049e0327a919a0c84a112128418759681714558000001705d76d8e0000004030047304502206dd59241ee81dac927f09080dfed12df4525de77912bff9d00a95d7357021fe3022100910c4ec6cbed6edfcf891a2cdf7b859127b5a77f0935a4a96a77381b99c823b000760007b75c1be57d68fff1b0c61d2315c7bae6577c5794b76aeebc613a1a69d3a21c000001705d76d92a00000403004730450221009fd180ccb46eb30b9a160391aeb6710711b05c6cbf7cedcf62b49acf8c6b5dc002207a73d83bbca9eec518ae6c1484fd350b26150640f05d9487a5eee7984f394677
 . . . . [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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