upandupseo.com.britishiron.bike

Issued by R3

About this certificate

This digital certificate with serial number 03:29:d6:1a:5b:61:cd:1d:92:cb:21:1f:aa:75:a5:01:fb:d1 was issued on by Let's Encrypt.

With 9 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=upandupseo.com.britishiron.bike

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:29:d6:1a:5b:61:cd:1d:92:cb:21:1f:aa:75:a5:01:fb:d1
Serial Number (int): 275573026483303396719450190164894339431377
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 25:f1:a6:aa:c8:88:e7:0f:5e:e9:42:06:1b:e7:85:ea:3f:3a:38:92
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 66:74:bc:d2:5a:6b:29:53:0c:b3:14:f3:1c:ee:92:c4:a3:bf:12:20
Fingerprint (sha256): db:63:2c:58:de:61:3c:25:d0:5a:a5:95:85:e9:0e:50:bc:9a:d1:9b:fb:14:a3:c0:3a:45:81:fb:e8:4d:ca:35

Issuing Certificate URL: http://r3.i.lencr.org/

Revocation information

OCSP Server: http://r3.o.lencr.org

Check the revocation status for certificate upandupseo.com.britishiron.bike

9

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for upandupseo.com.britishiron.bike

Public Key Algorithm

RSA

Key Size

2048

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

affiliateadvertisingnetwork.com
domainservicesinc.com.gayresorthotels.com
kakaduplumfreezedried.com
myretentioncredits.com
omancryptoexchange.com
sidehustleopps.com
taurushoodies.com
thehoardinginstitute.com
upandupseo.com.britishiron.bike

Other certificates including the domain name britishiron.bike

(limited to 100 certificates)
ucid.tv.britishiron.bike
britishiron.bike
upandupseo.com.britishiron.bike

Certificate

The complete raw certificate details for upandupseo.com.britishiron.bike in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtgs5IFajBrL9kESmbZFY
mi24WrGZJxMYsP6K8rZYO7XtMH+bIB7ef+bufcOEbOTPgfmjfph1vzjSbQ9YMNDD
dauj0j5hn5yzYwo10LRYA4l9FE/8tT161QGzPf63v7pen+U3BMoTf+MfkdqCq5H0
pTEXaj50jgJV+pOIT58IVK96jCMWmAfT7o6M98BugeVaYXcYftqZc7kezc+fSeZs
1mP3aBZqpBjOEQf5ytX56BUJAw/UMJj4lbep97jZ/++vC8Jce45Gzs6x6DBCkjIl
RJ30gGhAKFdAMlq+B8zzPrVJsTrCddIUXbQkNgVxzDuoxwA067QKD3n4Ub9vs/wd
EQIDAQAB
-----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 275573026483303396719450190164894339431377
 . . . . . . . . [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 'R3'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-03-31 01:16:33 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-06-29 01:16:32 +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 'upandupseo.com.britishiron.bike'
 . . . . . . . . [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 (2160 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 22980905845205103867592073555062584039981415167674406448318325765800842345151317054638006810076217592122341008708150801026440150693068080757618667817020698893743045333588198990817864416246152245922923940932648252268878987694370766408846880873783616269630198577664029993892200599494811685992473902920445050836532984626159007559274300896860042106811410107779477598538137238239056940777407342970529757379885038732786682811181861708867399780741055778708715394013198935379540951565267274796889848181184813111717980689806160349028528459797035295711296530441026939864699348985380173692355719987829014067753903098797213097233
 . . . . . . . . . . . . . . . . . . . . [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)
							25f1a6aac888e70f5ee942061be785ea3f3a3892
 . . . . . . . . . . . . . . . . [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 142eb317b75856cbae500940e61faf9d8b14c2c6
 . . . . . . . . . . . . . . . . [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 (73 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://r3.o.lencr.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://r3.i.lencr.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 (252 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'affiliateadvertisingnetwork.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'domainservicesinc.com.gayresorthotels.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'kakaduplumfreezedried.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'myretentioncredits.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'omancryptoexchange.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'sidehustleopps.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'taurushoodies.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'thehoardinginstitute.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'upandupseo.com.britishiron.bike'
 . . . . . . . . . . . . . . . . [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)
							00f0007600b73efb24df9c4dba75f239c5ba58f46c5dfc42cf7a9f35c49e1d098125edb499000001873573ca5b0000040300473045022100842c6951a017ee428f3668ee41813d49e70e70165757ff6a44637e19a1ce6112022073d103ba3da47dac694b422034185f3bfb19c261e8a02610e869a83268844c830076007a328c54d8b72db620ea38e0521ee98416703213854d3bd22bc13a57a352eb52000001873573ca6800000403004730450221008d0d7b8d9d2fd51a78e5da9fa75f19e75d898df5bdd307f9afd47313b040fa370220394ee1561692dd5fb11f6a1952a5ef4b04e8b08f0ec2d1839b340d54aad2791b
 . . . . [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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