www.alltow.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:38:cb:03:ca:0d:0a:62:9f:a3:77:31:71:43:12:c7:fa:06 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.alltow.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:38:cb:03:ca:0d:0a:62:9f:a3:77:31:71:43:12:c7:fa:06
Serial Number (int): 280662523300968127549526111489695613975046
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 99:ab:95:98:3a:fe:41:34:1f:5d:9e:cb:a5:1c:da:9b:42:e8:b9:3b
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 3e:7a:9b:6d:ac:c0:54:b6:51:16:fb:fe:95:20:3b:ae:69:54:7f:eb
Fingerprint (sha256): a3:49:74:0b:e0:6b:d1:b5:9d:67:96:e4:9a:eb:89:f0:49:ae:0a:cd:70:38:ff:05:23:8c:dc:f6:f6:8b:33:0b

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.alltow.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.alltow.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.alltow.com

Other certificates including the domain name alltow.com

(limited to 100 certificates)
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alltow.com
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www.alltow.com
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www.alltow.com
sportspacks.com
www.hawaiiatty.com
www.alltow.com
www.alltow.com
alltow.com
alpignano.org
www.emusoft.com
chemfront.com
www.cartheory.com

Certificate

The complete raw certificate details for www.alltow.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 280662523300968127549526111489695613975046
 . . . . . . . . [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 2020-02-17 04:20:02 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-05-17 04:20:02 +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.alltow.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 773282533214440849073417394237542240685680536074010612114457873336865676185948960258351334435554091308822389093921457624879430441574895616323087884138814379565292011225184482415647693951801418502715790034027080328209760870198803525991438919798160799401684822806304989306174025102272605477079249435661836316626036493892211284889450555218644074791738445803393262589301696829427635195691991758786788253218422277321586815616237130017083473366841208520161823281666456569566724095181602861924065059530609439467956779920635658232759665773998792882462580488253689466978606020509179931061420986944243250776243175665647821991323000970853651114714086227518080900884219191796502947437573400820980639920290590479839268419411664861458732990370400113649568652847976998626458652976052692106281560001923320998458228988460216044541564025194680093123975919782899280518756298795513595375435911993540598208952220114127341467950739774007807325469510247297164683003261466592366583823745666700599444971028315673060128277127523708688983580985970038437010146918192790598830936267703791072316223370295704285336259953224664706214473995438511988633380823660626578566943211682312747043148866712165857945047479607732046274697897174499774671665009842948202909174887
 . . . . . . . . . . . . . . . . . . . . [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)
							99ab95983afe41341f5d9ecba51cda9b42e8b93b
 . . . . . . . . . . . . . . . . [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 (18 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.alltow.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 (246 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes)
							00f10077005ea773f9df56c0e7b536487dd049e0327a919a0c84a112128418759681714558000001705196cc720000040300483046022100c6271ffea0ceb6285c8657b7d11b4a5db6d5f84cd8fdd370e5a60a9633b29927022100a91fa754f1c1689dfb3a164d5dda217bc50d3f4ad66dace07da345ae01e5a7ed007600b21e05cc8ba2cd8a204e8766f92bb98a2520676bdafa70e7b249532def8b905e000001705196cc5c0000040300473045022100a11f3aceea2532bb85bb9dc048fe3cdf7a1186ed4dcfe9a7dcea4e44b43f6e6a022042a8310592959bcf0805bf7953a3cdb2b277041d7fd722d509698c9784095526
 . . . . [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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