neommma.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:a3:34:89:a5:6a:ab:74:bd:a6:21:17:b5:f1:45:c0:a6:02 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=neommma.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:a3:34:89:a5:6a:ab:74:bd:a6:21:17:b5:f1:45:c0:a6:02
Serial Number (int): 316872718158892977277881840557230519264770
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 5f:0d:4e:79:7b:2c:88:02:a1:72:fb:2f:ea:0e:b6:1a:db:2b:10:30
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 3b:71:37:40:83:d6:64:c1:25:58:c4:d2:51:75:d7:af:a9:21:9f:d4
Fingerprint (sha256): 1d:36:8e:a2:59:a4:72:2c:d4:49:e1:8c:22:e9:75:f7:fe:c5:e1:bb:14:c8:a4:1b:6a:20:63:d0:f7:58:dd:4b

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 neommma.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for neommma.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

neommma.com

Other certificates including the domain name neommma.com

(limited to 100 certificates)
neommma.com
neommma.com
www.neommma.com
neommma.com
www.neommma.com
neommma.com
shenzhengaotie.com
www.neommma.com
lagod.com
neommma.com

Certificate

The complete raw certificate details for neommma.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 316872718158892977277881840557230519264770
 . . . . . . . . [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 2020-01-03 21:04:58 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-04-02 21:04:58 +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 'neommma.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 680213042540077978355667272901696069569518839145140478966820356913655024130838390953148325342087489209875047993406689932393816547749749844410169531193883492723702093421455187720971516370971936025173773112606755384175208767313197845027766459563098568386064375836333247983556793151320888121954804745981791962867979279141065271206215984870422690018240034100330438205199160734660743829512140709126457521102428071175140615770388986586960818513895526683927689442189242007198589843897292627321956041661053878435189559628852107022977000926138644253336111376780480161174172258036885092382303958717698117101675637394809253757145463621825984698934414022444732039380016002592621205886653755961345243983602449607490400045750163175148993828488556262700342235690103302764169719627854651760687389676065892454641463601596095482877511717206404037598231643223384879376717798241628978090169291207393191604398946191254541533612839441696151244667397405216810478475078436499066702203665014534690760089278304791321263677016549947559925304114743371743071972029138194611766653313451143849322111596023978265631987093079242097398009620298718946599979528768404320713021883615938879559323668739765715187113057943392929630240759192223432798014516473056101811649549
 . . . . . . . . . . . . . . . . . . . . [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)
							5f0d4e797b2c8802a172fb2fea0eb61adb2b1030
 . . . . . . . . . . . . . . . . [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 (15 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'neommma.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)
							00f10076005ea773f9df56c0e7b536487dd049e0327a919a0c84a1121284187596817145580000016f6d70ab6a000004030047304502202dc525c271031357aa4c7bed6157331620ae40b1b4ac7a04e7a40ce3cd8b03dc022100f62ba1eac08201761e0ed57ad9df9fb122020465ce982c072cf9ca332898643500770007b75c1be57d68fff1b0c61d2315c7bae6577c5794b76aeebc613a1a69d3a21c0000016f6d70ab9100000403004830460221009a3b387944eb6b836960c2c34101f3f078755e4bd77abd75b42eec6126966ae7022100f54cda81b8e77191d6247c90f1262538250b54107d9f15bafd5c36ab4d671b2e
 . . . . [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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