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Port 389 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
389 tcp LDAP LDAP (Lightweight Directory Access Protocol) - an Internet protocol, used my MS Active Directory,as well as some email programs to look up contact information from a server.

Both Microsoft Exchange and NetMeeting install a LDAP server on this port.

IBM Lotus Domino Server 7.0 allows remote attackers to cause a denial of service (segmentation fault) via a crafted packet to the LDAP port (389/TCP).
References: [CVE-2006-0580], [BID-16523]

Rockliffe MailSite 7.0 and earlier allows remote attackers to cause a denial of service by sending crafted LDAP packets to port 389/TCP, as demonstrated by the ProtoVer LDAP testsuite.
References: [CVE-2006-0790] [BID-16675] [SECUNIA-18888]
389 tcp,udp Lightweight Directory Access Protocol (LDAP) (official) Wikipedia
389 tcp,udp ldap Lightweight Directory Access Protocol IANA
522,389,1503,1720,1731 tcp applications NetMeeting 2.0 through 3.01 (can also use ports 1024-65535 udp) Portforward
389 tcp ms-ils Microsoft NetMeeting ILS server default port (for versions older than w2k) Neophasis
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Related ports: 522  636  1002  29831  

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External Resources
SANS Internet Storm Center: port 389

Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.

TCP ports use the Transmission Control Protocol. TCP is the most commonly used protocol on the Internet and any TCP/IP network. Whereas the IP protocol deals only with packets, TCP enables two hosts to establish a connection and exchange streams of data. TCP guarantees delivery of data and that packets will be delivered in the same order in which they were sent. Guaranteed communication/delivery is the key difference between TCP and UDP.

UDP ports use the Datagram Protocol, a communications protocol for the Internet network, transport, and session layers. Like TCP (Transmission Control Protocol), UDP is used with IP (the Internet Protocol) and makes possible the transmission of datagrams from one computer to applications on another computer, but unlike TCP, UDP is connectionless and does not guarantee reliable communication; it's up to the application that received the message to process any errors and verify correct delivery. UDP is often used with time-sensitive applications, such as audio/video streaming, where dropping some packets is preferable to waiting for delayed data.

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