Port 388Unidata Local Data Manager

Unidata LDM distributes real-time meteorological and other scientific data products between cooperating systems.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 4/10
lookups: 0

also known as unidata-ldm, LDM, LDM-6

Technical Details

what runs on :388

LDM normally uses TCP port 388 for control and product-transfer connections; UDP 388 is also registered for LDM deployments that use UDP-based or multicast distribution modes. The LDM-6 protocol establishes a client/server session, negotiates or requests a feed, and transfers individually framed data products identified by metadata such as feed type, origin, creation time, and product identifier. The server is typically rpc.ldmd, and port 388 is the standard default. Access and feed selection are controlled through LDM configuration rules such as ALLOW and REQUEST, while received products are stored in an LDM product queue and routed by downstream processing rules.

Security Information

exposure of :388

risk score

4/ 10caution

worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.

streaming averages 3.2 across 38 ports — this one sits 0.8 above.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

LDM traffic is normally unencrypted and does not provide modern end-to-end authentication by default. Internet exposure can permit unauthorized feed access where configuration is permissive, consume bandwidth or queue resources, and provide a path for malformed or unwanted products to reach downstream processing programs. Restrict port 388 to explicitly trusted feed peers with firewall rules and LDM access controls; use a VPN or secure tunnel when distribution must cross untrusted networks.

Record

iana registry entry

port: :388
service: Unidata Local Data Manager
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 4/10caution
category: Streaming System
usage: Unidata Local Data Manager (LDM) is used by universities, weather services, and research organizations to distribute real-time meteorological, satellite, model, and other scientific data. An LDM downstream host connects to an upstream feed source, receives products, and commonly places them in a local product queue for processing by tools such as pqact.
lookups: 0rank 994
added: 2026-09-07
updated: 2026-09-07
references: IANA service name registry — port 388

Something wrong?

This record is maintained by the engineers who use port 388. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-09-07.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

all 38 in streaming →

the 8 most looked-up other ports in streaming — 38 ports carry that label.

port	service	proto	category	risk	views
:8888	GNUmp3d Streaming HTTP	TCP	Web Services	caution	76.3k
:8000	Alternate HTTP / SHOUTcast	TCP	Web Services	caution	45.0k
:8880	Windows Media SOAP Connector	TCP	Streaming	caution	24.3k
:5001	Slingbox	TCP	Streaming	caution	22.4k
:1220	QTSS Admin	TCP	Streaming	safe	20.6k
:19294	Google Talk Voice/Video	TCP	Streaming	caution	16.6k
:12013	Audition Korea Server	TCPUDP	Streaming	caution	14.5k
:9000	SqueezeCenter	TCP	Web Services	caution	14.4k

risk mix of the 8 listed

safe13%
caution88%

0 of 8 encrypted

Port :388Unidata Local Data Manager

Technical Details

Security Information

Related Ports

Port 388Unidata Local Data Manager