ISRG Root X2
E559297
ISRG Root X2 is a widely trusted intermediate certificate authority operated by the Internet Security Research Group to enable free, automated TLS/SSL certificates for the web.
All labels observed (1)
| Label | Occurrences |
|---|---|
| ISRG Root X2 canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T5919748 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: ISRG Root X2 Context triple: [Let’s Encrypt, hasRootCertificate, ISRG Root X2]
-
A.
ISRG Root X1
ISRG Root X1 is the primary root certificate operated by the Internet Security Research Group that underpins the trust for most Let’s Encrypt-issued TLS/SSL certificates used across the web.
-
B.
DST Root CA X3
DST Root CA X3 is a widely trusted root certificate authority operated by IdenTrust that historically provided the cross-signed trust anchor enabling broad browser compatibility for Let’s Encrypt certificates.
-
C.
ISRG
ISRG (Internet Security Research Group) is the nonprofit organization that operates the free, automated, and open certificate authority Let’s Encrypt, promoting widespread use of HTTPS on the web.
-
D.
Let’s Encrypt
Let’s Encrypt is a free, automated, and open certificate authority that provides TLS/SSL certificates to enable secure HTTPS connections for websites worldwide.
-
E.
Comodo Dragon
Comodo Dragon is a Chromium-based web browser developed by Comodo that emphasizes enhanced security and privacy features compared to standard browsers.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: ISRG Root X2 Target entity description: ISRG Root X2 is a widely trusted intermediate certificate authority operated by the Internet Security Research Group to enable free, automated TLS/SSL certificates for the web.
-
A.
ISRG Root X1
ISRG Root X1 is the primary root certificate operated by the Internet Security Research Group that underpins the trust for most Let’s Encrypt-issued TLS/SSL certificates used across the web.
-
B.
DST Root CA X3
DST Root CA X3 is a widely trusted root certificate authority operated by IdenTrust that historically provided the cross-signed trust anchor enabling broad browser compatibility for Let’s Encrypt certificates.
-
C.
ISRG
ISRG (Internet Security Research Group) is the nonprofit organization that operates the free, automated, and open certificate authority Let’s Encrypt, promoting widespread use of HTTPS on the web.
-
D.
Let’s Encrypt
Let’s Encrypt is a free, automated, and open certificate authority that provides TLS/SSL certificates to enable secure HTTPS connections for websites worldwide.
-
E.
Comodo Dragon
Comodo Dragon is a Chromium-based web browser developed by Comodo that emphasizes enhanced security and privacy features compared to standard browsers.
- F. None of above. chosen
Statements (40)
| Predicate | Object |
|---|---|
| instanceOf |
public key infrastructure root
ⓘ
root certificate authority ⓘ |
| abbreviation | ISRG ⓘ |
| application |
HTTPS
ⓘ
secure web browsing ⓘ |
| associatedProject |
Let’s Encrypt certificate authority
ⓘ
linked to:
Let’s Encrypt
|
| certificateType | root CA certificate ⓘ |
| chainOfTrustRole | root of trust for Let’s Encrypt certificates ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| ecosystemRole | trust anchor for intermediate CAs ⓘ |
| field |
public key infrastructure
ⓘ
web security ⓘ |
| goal |
improve internet security
ⓘ
increase HTTPS adoption ⓘ |
| nonProfitMission | provide free digital certificates ⓘ |
| operatedBy | Internet Security Research Group ⓘ |
| operator | Internet Security Research Group ⓘ |
| organizationType | non-profit ⓘ |
| ownedBy | Internet Security Research Group ⓘ |
| parentOrganization | Internet Security Research Group ⓘ |
| protocol |
X.509
ⓘ
linked to:
X.509 certificates
|
| purpose |
enable free automated SSL certificates
ⓘ
enable free automated TLS certificates ⓘ |
| relatedTo |
ISRG Root X1
ⓘ
Let’s Encrypt Authority X1 ⓘ Let’s Encrypt Authority X3 ⓘ |
| scope | public internet ⓘ |
| securityModel | public key cryptography ⓘ |
| status | active ⓘ |
| supports |
SSL
ⓘ
TLS ⓘ |
| supportsAutomation | ACME-based issuance ⓘ |
| trustLevel | widely trusted ⓘ |
| trustStoreInclusion |
application trust stores
ⓘ
major operating systems ⓘ major web browsers ⓘ mobile operating systems ⓘ |
| usedBy | Let’s Encrypt ⓘ |
| validFor |
TLS server certificates
ⓘ
server authentication ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: ISRG Root X2 Description of subject: ISRG Root X2 is a widely trusted intermediate certificate authority operated by the Internet Security Research Group to enable free, automated TLS/SSL certificates for the web.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.