What port number is used by LDAP protocol?

The correct answer is B. 389. LDAP (Lightweight Directory Access Protocol) uses port 389 for directory queries and authentication against services such as Active Directory.

Enumeration

Question

Options

A110
B389
C464
D445

How the community answered

(32 responses)

A
3% (1)
B
94% (30)
D
3% (1)

Why each option

LDAP (Lightweight Directory Access Protocol) uses port 389 for directory queries and authentication against services such as Active Directory.

A110

Port 110 is assigned to POP3 (Post Office Protocol version 3), used for retrieving email from a mail server.

B389Correct

Port 389 is the IANA-assigned well-known port for LDAP, used for directory lookups, bind authentication, and attribute queries. The secure variant LDAPS uses port 636, while LDAP over STARTTLS also initiates on port 389 before upgrading to an encrypted channel.

C464

Port 464 is assigned to the Kerberos password change protocol (kpasswd), not LDAP.

D445

Port 445 is used by Microsoft SMB (Server Message Block) for file and printer sharing over TCP/IP.

Concept tested: LDAP well-known port number identification

Source: https://learn.microsoft.com/en-us/troubleshoot/windows-server/active-directory/active-directory-over-specific-ports

Topics

#LDAP#port 389#directory services#network protocols

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