Port 3268

Q: What is port 3268?

Active Directory Global Catalog over LDAP Port 3268 provides LDAP access to the Microsoft Active Directory Global Catalog, which contains a partial replica of all objects in an AD forest. It is used for cross-domain authentication, universal group lookups, and queries that must span multiple domains. Access is unencrypted — use port 3269 for the TLS-secured equivalent.

LDAP-GC

Active Directory Global Catalog over LDAP

Port

3268

Protocol

TCP

Service

LDAP-GC

Security

Restricted

Full name: Microsoft Global Catalog LDAP

What is port 3268?

Port 3268 provides LDAP access to the Microsoft Active Directory Global Catalog, which contains a partial replica of all objects in an AD forest. It is used for cross-domain authentication, universal group lookups, and queries that must span multiple domains. Access is unencrypted — use port 3269 for the TLS-secured equivalent.

Related ports

← All ports