Port 5504fcp-cics-gw1

Port 5504 is assigned to fcp-cics-gw1, a service name registered to Ken Wittmer with no established public usage.

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

Technical Details

what runs on :5504

fcp-cics-gw1 is registered on port :5504 over tcp and udp to Ken Wittmer. 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 never observed open, so if it's open on your network it's more likely a custom or misconfigured service than the registered one.

find what's listening on :5504

this machine

# linux
sudo ss -tulpn 'sport = :5504'

# macos / bsd
sudo lsof -nP -i :5504

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :5504

another host

nmap -sV -p T:5504 <host>
sudo nmap -sU -sV -p U:5504 <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 :5504

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 :5504 yet

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

Record

iana registry entry

port: :5504
service: fcp-cics-gw1
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: The IANA assignment names the service fcp-cics-gw1 and lists Ken Wittmer as its registrant. No widely documented implementation or common deployment is established.
lookups: 0rank 993
added: 2026-10-08
updated: 2026-10-08
references: IANA service name registry — port 5504

Something wrong?

This record is maintained by the engineers who use port 5504. 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 2026-10-08.

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 :5504, by lookups.

port	service	proto	category	risk	views
:5555	Freeciv	TCP	Security	caution	26.9k
:5495	Applix TM1 Admin	TCP	Databases	caution	24.8k
:5500	VNC Viewer Listener	TCP	Remote Access	caution	15.1k
:5450	OSIsoft PI System Client	TCP	Databases	caution	14.3k
:5498	Hotline Tracker Server	TCP	File Transfer	caution	8.4k
:5550	HP Data Protector	TCP	File Transfer	caution	8.2k
:5517	Setiqueue Proxy	TCPtls	Cloud	caution	8.0k
:5501	Hotline File Transfer	TCP	File Transfer	caution	7.8k

risk mix of the 8 listed

caution100%

1 of 8 encrypted

Port :5504fcp-cics-gw1

Technical Details

Security Information

Related Ports

Port 5504fcp-cics-gw1