img.hostexp.com

Issued by R3

About this certificate

This digital certificate with serial number 04:dd:2d:42:e8:14:60:f2:6a:b2:2e:b5:14:09:01:5a:fd:0f was issued on by Let's Encrypt.

With 3 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:
  • DV certificate contains a subject common name, this is not recommended. If certificate policy 2.23.140.1.2.1 (CA/B BR domain validated) is included, only country and/or common name is allowed in SubjectDN. (BRs: 7.1.2.7.2)
  • Subscriber certificates use of Subject Key Identifier is NOT RECOMMENDED (BRs v2: 7.1.2.7.6)
  • Subscriber Certificate: commonName is NOT RECOMMENDED. (BRs: 7.1.2.7.1)

Certificate Subject

CN=img.hostexp.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:dd:2d:42:e8:14:60:f2:6a:b2:2e:b5:14:09:01:5a:fd:0f
Serial Number (int): 423711709475104966447127294805140934688015
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: c3:81:3e:e5:c5:1e:ad:75:c1:30:9e:d3:b9:a8:97:bd:ef:00:aa:c2
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 8b:b8:6d:5f:85:1a:ed:d9:11:3b:65:39:37:ed:25:70:22:27:4e:c4
Fingerprint (sha256): 01:01:d0:65:5d:39:f3:5a:4d:94:92:c1:b1:3b:ce:37:32:79:61:7a:dc:a9:e0:78:3f:95:52:ad:40:f7:7c:5a

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

Revocation information

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

Check the revocation status for certificate img.hostexp.com

3

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for img.hostexp.com

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

cn.imgcampusmap.com
img.campusmaps.com
img.hostexp.com

Other certificates including the domain name hostexp.com

(limited to 100 certificates)
odu.hostexp.com
nsulamap.hostexp.com
occtour.hostexp.com
img.hostexp.com
sjcc.hostexp.com
img.hostexp.com
stu.hostexp.com
hsc.hostexp.com
kingsborough.hostexp.com
svsuwalk.hostexp.com
suffolk.hostexp.com
villanovavirtualvisit.com
shadygrove.hostexp.com
stevens.hostexp.com
pikeville.hostexp.com
endicott.hostexp.com
adelphi.hostexp.com
cazenovia.hostexp.com
stu.hostexp.com
hms.hostexp.com
suffolk.hostexp.com
seminolestate.hostexp.com
sjcc.hostexp.com
endicott.hostexp.com
stu.hostexp.com
adelphi.hostexp.com
uncsamap.hostexp.com
ornl.hostexp.com
wssu.hostexp.com
occ.hostexp.com
nku.hostexp.com
culinary.hostexp.com
pepperdine.hostexp.com
sdcc.hostexp.com
adelphi.hostexp.com
seminolestate.hostexp.com
atsu.hostexp.com
prioryca.hostexp.com
villanovavirtualvisit.com
seminolestate.hostexp.com
pikeville.hostexp.com
stevens.hostexp.com
ornl.hostexp.com
villanovavirtualvisit.com
cazenovia.hostexp.com
pepperdine.hostexp.com
pepperdine.hostexp.com
shadygrove.hostexp.com
seminolestate.hostexp.com
culinary.hostexp.com
stu.hostexp.com
culinary.hostexp.com
occ.hostexp.com
stevens.hostexp.com
wluva.hostexp.com
atsu.hostexp.com
mcmaster.hostexp.com
odu.hostexp.com
adelphi.hostexp.com
iolani.hostexp.com
radford.hostexp.com
prioryca.hostexp.com
odu.hostexp.com
nsu.hostexp.com
lattc.hostexp.com
sdcc.hostexp.com
wssu.hostexp.com
hms.hostexp.com
hms.hostexp.com
iolani.hostexp.com
merced.hostexp.com
nku.hostexp.com
miracosta.hostexp.com
*.ctpprojects.com
seminolestate.hostexp.com
philau.hostexp.com
svsu.hostexp.com
uncsatour.hostexp.com
wssu.hostexp.com
nsu.hostexp.com
gwu.hostexp.com
mcmaster.hostexp.com
gwu.hostexp.com
occ.hostexp.com
cedarville.hostexp.com
mtsinai.hostexp.com
npn.hostexp.com
gwc.hostexp.com
nsulamap.hostexp.com
fmhspanish.hostexp.com
cmich.hostexp.com
suffolk.hostexp.com
occtour.hostexp.com
mcmaster.hostexp.com
radford.hostexp.com
northampton.hostexp.com
unftour.hostexp.com
gwuembed.hostexp.com
svsu.hostexp.com
villanovavirtualvisit.com

Certificate

The complete raw certificate details for img.hostexp.com in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEApQrUppAAEkTu8TkwXrwR
8UH5b7vZYhCiLtdEFDQmLOil+W19qLABYIdVx0mZwq5VIwQUd8PiOWv5fN4uxGru
5PaQcY3KOA6di4ZrinvZ+/J2GEKNoAz8YHBBRxKHgeF2yBepYRegOkoy8eoK3fAO
vRIS7r3nW9HrjV5Q2SPUnGNCmJST5utZpa5cTfP39tThF1NVX6qRblA2LfTFUHNq
RAsaTCu/9ksJuUkthEqQ5BBcnAT+3qD1DzQVOljKuDd+4iokuTQpUjDb+8r1mHgy
QrCAfclEf8OvNBzsSR+qr9SS0TuxQ/D71C7Ei2IThneZoWs+tFt68G8MoGnsI96k
rQIDAQAB
-----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 423711709475104966447127294805140934688015
 . . . . . . . . [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 2023-09-25 02:35:12 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-12-24 02:35:11 +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 'img.hostexp.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 (2160 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 20834661120125936345596705800423559033065102810057678053543475435967139820868846624724970925736811869510203129813301340178796798335503155869104655234275261219596302537479589981370525695847225356844001390982897014973878707759295803467307737296588028509169636651706408641957517939545631999283335362818644958699963307322892623181740162466670832543519861351977270089686227512488125844868411199927560845576616561406061678179638636349537831453550678034341483364701881218995220120453083036379278058963203563856913899967888062578268408598718583151779622188682760787478392318167616274600817193558569405491605688347427910624429
 . . . . . . . . . . . . . . . . . . . . [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)
							c3813ee5c51ead75c1309ed3b9a897bdef00aac2
 . . . . . . . . . . . . . . . . [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 (60 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'cn.imgcampusmap.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'img.campusmaps.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'img.hostexp.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 (12 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 1.3.6.1.4.1.11129.2.4.2
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (244 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (241 bytes)
							00ef007600b73efb24df9c4dba75f239c5ba58f46c5dfc42cf7a9f35c49e1d098125edb4990000018aca67c57300000403004730450220392ef6203c13ef4fc780749526ee87c0f4b25e09d8aa3a773c4d25ed4f66fe180221008b9a88611fba87d2f06debacdc6c7c9c4f8d8adbcddee3d2f1a74579e34dbe24007500e83ed0da3ef5063532e75728bc896bc903d3cbd1116beceb69e1777d6d06bd6e0000018aca67c57a00000403004630440220383e965f8e7819f5b1261490cbf41ab8b67867a1bd39b625692e55ea395ecfd002207380fe2c14903573c328a67581054c2bf51158d94484c687ecf4223918ec55a9
 . . . . [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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