Port 3603Integrated Receiver Control

Integrated Receiver Control traffic on TCP/UDP port 3603, an obscure assignment registered to Dave Stone.

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

also known as int-rcv-cntrl

Technical Details

what runs on :3603

Integrated Receiver Control is registered on port :3603 over tcp and udp to Dave Stone, assigned September 2002. We don't have a technical write-up for it beyond the IANA registry entry.

In nmap's internet-wide scan data this port is found open rarely. What's listening is often not the registered service, so check before you assume.

find what's listening on :3603

this machine

# linux
sudo ss -tulpn 'sport = :3603'

# macos / bsd
sudo lsof -nP -i :3603

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :3603

another host

nmap -sV -p T:3603 <host>
sudo nmap -sU -sV -p U:3603 <host>

run it? the handshake, the implementations you meet in the wild and the flags that matter come from the engineers who do.

add technical details

Security Information

exposure of :3603

risk score

1/ 10safe

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

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

no security notes recorded for :3603 yet

known exploits, hardening advice, what a compromise looks like — suggest an edit if you know its exposure.

Record

iana registry entry

port: :3603
service: Integrated Receiver Control
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: Port 3603 is assigned for Integrated Receiver Control over TCP and UDP. The assignment was registered to Dave Stone in 2002, but public protocol or product usage information is not established.
lookups: 0rank 993
added: 2026-09-04
updated: 2026-09-04
references: IANA service name registry — port 3603

Something wrong?

This record is maintained by the engineers who use port 3603. 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 2026-09-04.

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

browse categories →

ports registered around :3603, by lookups.

port	service	proto	category	risk	views
:3605	ComCam IO	UDP	Security	caution	7.8k
:3544	Teredo	UDP	Security	caution	7.8k
:3606	Splitlock Server	TCPUDP	Security	caution	6.5k
:3632	DistCC Distributed Compiler	TCP	Network Services	caution	6.1k
:3595	ShareApp	TCPUDP	—	safe	0
:3569	Meinberg Control Service	TCPUDP	Network Services	safe	0
:3664	UPS Engine	TCPUDP	System	safe	0
:3659	Apple SASL	TCPUDP	Network Services	safe	0

risk mix of the 8 listed

safe50%
caution50%

0 of 8 encrypted

Port :3603Integrated Receiver Control

Technical Details

Security Information

Related Ports

Port 3603Integrated Receiver Control