infofo.ru

Issued by Sectigo RSA Domain Validation Secure Server CA

About this certificate

This digital certificate with serial number 76:ba:f1:01:e0:d3:6a:ec:2c:9d:3e:d0:59:36:51:4c was issued on by Sectigo Limited.

With 2 subject alternative names this certificate can be used to secure multiple fqdn's. This certificate is currently not expired, we haven't checked the revocation status of this certificate but you can do this simply on revocationcheck.com. 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=infofo.ru

Sectigo Limited

Organization: Sectigo Limited
State / Province: Greater Manchester
Locality: Salford
Country: GB

This certificate will expire on

Certificate Details

Serial Number (hex): 76:ba:f1:01:e0:d3:6a:ec:2c:9d:3e:d0:59:36:51:4c
Serial Number (int): 157819558927830423983805976813063524684
Serial Number lenght: 127 bits, 16 octets

SubjectKeyId: 91:cf:83:a2:ba:2c:52:2b:9e:60:05:87:e1:de:95:db:32:ea:79:dc
AuthorityKeyId: 8d:8c:5e:c4:54:ad:8a:e1:77:e9:9b:f9:9b:05:e1:b8:01:8d:61:e1

Fingerprint (sha1): 10:5f:31:9e:94:f1:f5:cb:71:78:8f:0c:4b:3f:cf:fe:00:b9:98:ee
Fingerprint (sha256): a4:66:3b:db:36:da:4f:b2:d7:93:59:d5:f0:b7:83:b8:87:16:c3:66:92:fc:2a:da:ea:a4:88:79:22:69:76:84

Issuing Certificate URL: http://crt.sectigo.com/SectigoRSADomainValidationSecureServerCA.crt

Revocation information

OCSP Server: http://ocsp.sectigo.com

Check the revocation status for certificate infofo.ru

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for infofo.ru

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

infofo.ru
www.infofo.ru

Other certificates including the domain name infofo.ru

(limited to 100 certificates)

Certificate

The complete raw certificate details for infofo.ru in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA60Wect+cFtBLBPQtCPMI
vQkqPpI5AI2sjEBNzpuagyuKC/Mc6wVM/1IbmLIEIZW/xqiollL2Y0T3q1ZTkZus
/gDzWris+3JW7yfUET8dE9ntz4fHuYEqqNTCLwHa7sqD9JSFKBlEvyJJSevrqQgH
x1pgGM4JTfsQ4oS6SdnjpSZAdEqbV4jam+iBjbM5VwaOPqhjt+J+oQxWdbbKKhU0
rD4yunq76yq+CvCugttMxiH54Pe/0vaKUQ9KDnVdBGGGwjRQWOnlEjuhkxMI5a5s
PFvgq4+t2mOrKoJuvi+ivj0+Iuh3f8zmMAwBdpvEqVr8A9dOm25v0jt+rnqr4W0X
MQIDAQAB
-----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 157819558927830423983805976813063524684
 . . . . . . . . [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 'GB'
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.8 (stateOrProvinceName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Greater Manchester'
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.7 (localityName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Salford'
 . . . . . . . . . . . . [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 'Sectigo Limited'
 . . . . . . . . . . . . [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 'Sectigo RSA Domain Validation Secure Server CA'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-03-23 00:00:00 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2022-03-27 23:59:59 +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 'infofo.ru'
 . . . . . . . . [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 29700332046011311175713036397384574901261309567867747574536456475785042506971042146161558086070979591389123984356125892946901616621217904391655484704043426290922299746139736112818640229736882696793951219131150067338916466152743422099416112536267379738424898958059548982977448466282714216014013435183956562513158691616502644574862450243652866733687339729551126189550334080361449541902136010901660823191761942783488859543164503762304404406194821580770550537202752519009593100533214707656942985737202536195215603425419467658842788765918418740345402055294802432789073292818490546236748979219697402795578806330375659132721
 . . . . . . . . . . . . . . . . . . . . [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 2.5.29.35 (authorityKeyIdentifier)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|false] OtherName 8d8c5ec454ad8ae177e99bf99b05e1b8018d61e1
 . . . . . . . . . . . . . . . . [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)
							91cf83a2ba2c522b9e600587e1de95db32ea79dc
 . . . . . . . . . . . . . . . . [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 2.5.29.19 (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 2.5.29.37 (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 2.5.29.32 (certificatePolicies)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (66 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.4.1.6449.1.2.2.7
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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 'https://sectigo.com/CPS'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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 1.3.6.1.5.5.7.1.1 (authorityInfoAccess)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (120 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.2 (caIssuers)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://crt.sectigo.com/SectigoRSADomainValidationSecureServerCA.crt'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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.sectigo.com'
 . . . . . . . . . . . . . . . . [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 'infofo.ru'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.infofo.ru'
 . . . . . . . . . . . . . . . . [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 (366 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (362 bytes)
							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
 . . . . [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)
		00255f720084c9cea12c30ecdf92246802d95f7a8e53235c3c97d85b3b3f33fffd7fa38ae7b163336a66ea40db156f0f52750c2ea3e9f6e4f708815b91429d7718c5fe7a0f8c6c1fad33e4795f232d49c27421c3183eb886c2d4834092fe3942f0f5219d1adc95478a99e30ce920f5ecf989e0e943c5eff39e578963c049882d65546c0b8fe61f754bcaeaf7e71343251cd2cb60c23d5fa7111ff21d54aaafe4db317eaddbcf2ee5ac3b35d8927f75b17e2c34f194ee940903f2f0670fafbb3d0b667b562e3ddfa421910c376ed5116826af70eef937218c1c7ea87a219ca68963c60f3a302532189b8f6d5ac7d2e3dda901924d651de2ff7b7d82f776ff00bef3