comand.co

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:77:45:67:10:16:5c:d8:ee:66:9d:53:b4:21:d4:cf:f8:0d 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=comand.co

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:77:45:67:10:16:5c:d8:ee:66:9d:53:b4:21:d4:cf:f8:0d
Serial Number (int): 301922711323448313482926648257936414996493
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 99:5a:e2:38:5e:06:8e:f3:77:67:ef:cf:93:a3:02:16:aa:e5:d8:b0
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 83:64:9f:2c:cc:43:42:d4:24:e8:ee:06:96:86:b1:7f:65:c4:84:42
Fingerprint (sha256): 80:00:56:3d:2f:d5:9c:f5:aa:04:e0:b4:d6:2f:c1:e2:20:50:97:ea:d7:88:7c:8e:a0:39:ce:08:77:47:f2:50

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 comand.co

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for comand.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

comand.co
www.comand.co

Other certificates including the domain name comand.co

(limited to 100 certificates)

Certificate

The complete raw certificate details for comand.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 301922711323448313482926648257936414996493
 . . . . . . . . [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 2020-01-28 14:31:19 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-04-27 14:31:19 +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 'comand.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 877168993506751871383297297538669733993540500724203452042970791916568832843575812813641573177635040608307262652122231955052415961425580444623528059291585267987692641506791927577609495524387615842004610548254998523003476811449125734341816907991360606339779764069929365491051538102107528348760983068090432951937399427979375234181874689839398973845724704763815497869405533964826746248951168154974133254092950253193567978590589276361294776500760046191182371854275941007138221245495380298940411620301355019174183929549458314421262597542231695979110943841250043347127349064955860301365498595999576827093582364985135210707970985455754504442951936310585712232402087981143225380438229381898975596703461107740084470724045625108507205693813729382177215464790922580647015706245671770527541539935678068012530647194496057198685173146849925650602910179683038300642732036853366802620162551724623360107342696165661440502690746176727386658995361685417729707171276441737215694148831841078981776424438818112096837374325805752650637424512341208255580464289543068340001218686826855659325288338806283637411493271543702854306945890113347951844577236776341513558095214494839255437238915382262632015435423288145851431667079827891073563328458925734670384328601
 . . . . . . . . . . . . . . . . . . . . [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)
							995ae2385e068ef37767efcf93a30216aae5d8b0
 . . . . . . . . . . . . . . . . [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 (28 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'comand.co'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.comand.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 (246 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes)
							00f100760007b75c1be57d68fff1b0c61d2315c7bae6577c5794b76aeebc613a1a69d3a21c0000016fecc74536000004030047304502207a90f284f55d580f91d87ff6e95a67ae6f4e0689b4f51a40646f8c0ebbfdc664022100f6f1627b8f327a5848ff25460ffbdc2170225e78ef1c214d080000f47bbb08500077006f5376ac31f03119d89900a45115ff77151c11d902c10029068db2089a37d9130000016fecc745c50000040300483046022100c94c00bcaca84fd53c2d2ef6d363e9a08ea38ae436169ba1a42c1c88da500d5e022100e322d2265f0013fec90e40f798d9a6dcc0bbff84bb9dc9f981ab27d60920ac39
 . . . . [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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