Port 5903Flight and Flow Information for a Collaborative Environment (FF-ICE)

Port 5903 is assigned to FF-ICE, the aviation framework for exchanging collaborative flight and flow information.

transport: tcp · udp · sctp
in transit: cleartext
assignment: official
risk: 1/10
lookups: 0

also known as ff-ice, Flight and Flow Information for a Collaborative Environment

Technical Details

what runs on :5903

IANA assigns port 5903 to FF-ICE over TCP, UDP, and SCTP. FF-ICE supports collaborative aviation information exchange, including flight-plan-related services; its information models are associated with FIXM and deployments are generally part of aviation information-management or SWIM environments. The port registration does not establish a universal handshake, framing, or encryption behavior, so those details depend on the implementation and its deployment profile.

Security Information

exposure of :5903

risk score

1/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

network services averages 2.6 across 1,673 ports — this one sits 1.6 below.

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 · sctp

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

security overview

Treat an exposed listener as an aviation-system service, not as an ordinary public application. Keep it restricted to authorized aviation networks and peers; the port assignment does not itself provide authentication or encryption, and the security properties depend on the implementation and surrounding deployment. Internet-wide scan data has not observed it open.

Record

iana registry entry

port: :5903
service: Flight and Flow Information for a Collaborative Environment (FF-ICE)
transport: TCPUDPSCTP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: Network Services
usage: The assignment is for FF-ICE, an ICAO framework used by air navigation service providers and other aviation participants to share flight and flow information. It is not a general-purpose service, and the assignment alone does not mean a host on the public internet will be listening.
lookups: 0rank 993
added: 2026-10-09
updated: 2026-10-09
references: IANA service name registry — port 5903

Something wrong?

This record is maintained by the engineers who use port 5903. 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 2026-10-09.

01edit any field on a page of its own
02a model checks it for accuracy and spam
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edit this record →back to the registry

Related Ports

all 1,673 in network services →

the 8 most looked-up other ports in network services — 1,673 ports carry that label.

port	service	proto	category	risk	views
:9080	Groove RPC	TCPUDP	Web Services	caution	70.8k
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:5938	TeamViewer	TCPUDP	Remote Access	caution	65.0k
:8291	Winbox MikroTik Admin	TCP	Security	caution	62.9k
:3233	WhiskerControl Protocol	TCPUDP	Network Services	caution	61.9k
:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:3128	Tatsoft Default HTTP Proxy	TCP	Web Services	caution	46.8k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :5903Flight and Flow Information for a Collaborative Environment (FF-ICE)

Technical Details

Security Information

Related Ports

Port 5903Flight and Flow Information for a Collaborative Environment (FF-ICE)