Port 603Intrusion Detection Exchange Protocol

IDXP carries IDMEF intrusion-detection alerts between sensors, analysis systems, and security management platforms.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 3/10
lookups: 0

also known as idxp, IDMEF exchange

Technical Details

what runs on :603

IDXP is an application-layer protocol for exchanging structured IDMEF messages between intrusion-detection components. The registry assigns port 603 for both TCP and UDP; deployments commonly use a reliable session-oriented transport and may apply TLS or other authentication and integrity protections. Payloads are structured alert messages rather than general-purpose application data, and implementations should follow the IDXP and IDMEF specifications for message framing and transport behavior.

Security Information

exposure of :603

risk score

3/ 10caution

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

security averages 3.8 across 222 ports — this one sits 0.8 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

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

security overview

Internet exposure is generally unnecessary: an exposed endpoint may disclose sensitive alert, host, and network information and could accept forged or manipulated detection messages if peer authentication and integrity checks are absent. Restrict the service to known IDS and management peers, use authenticated encrypted transport where supported, and monitor for unexpected external access.

Record

iana registry entry

port: :603
service: Intrusion Detection Exchange Protocol
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 3/10caution
category: Security Network Services
usage: IDXP is used to exchange Intrusion Detection Message Exchange Format (IDMEF) alerts between IDS sensors, analysis engines, and security management systems. It is uncommon on public networks and is normally restricted to internal monitoring infrastructure.
lookups: 0rank 994
added: 2026-08-21
updated: 2026-08-21
references: IANA service name registry — port 603
RFC 4767

Something wrong?

This record is maintained by the engineers who use port 603. 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 2026-08-21.

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 222 in security →

the 8 most looked-up other ports in security — 222 ports carry that label.

port	service	proto	category	risk	views
:8881	Atlasz Secure Server	TCP	Web Services	caution	67.6k
:443	HTTPS	TCPtls	Web Services	caution	65.9k
:8291	Winbox MikroTik Admin	TCP	Security	caution	62.9k
:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:3128	Squid Proxy HTTP	TCP	Web Services	caution	45.8k
:8080	HTTP Alternate	TCPtls	Web Services	caution	44.9k
:7000	Vuze HTTPS Tracker	TCPtls	Security	caution	28.9k

risk mix of the 8 listed

caution100%

3 of 8 encrypted

Port :603Intrusion Detection Exchange Protocol

Technical Details

Security Information

Related Ports

Port 603Intrusion Detection Exchange Protocol