CyberHunter
Local dataset, no network
// Other services

Port 5501: fcp-addr-srvr2

Port 5501 is assigned by IANA to fcp-addr-srvr2 (fcp-addr-srvr2).

5501

How fcp-addr-srvr2 works

Other services
client:5501fcp-addr-srvr2response client:5501fcp-addr-srvr2response

The client sends a request to port 5501 and the fcp-addr-srvr2 service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 5501 dangerous?

We have no specific security note for port 5501. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 5501

ServicePortTransportDescriptionReferenceUpdated
fcp-addr-srvr2 5501 TCP, UDP fcp-addr-srvr2 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 5501, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5501'      # process listening on 5501
sudo lsof -nP -i :5501

macOS

sudo lsof -nP -i :5501

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5501 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5501
netstat -ano | findstr :5501

From another machine

nmap -p 5501 -sV <host>
sudo nmap -sU -p 5501 <host>
nc -zv <host> 5501

Block it in the firewall

sudo ufw deny 5501/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5501" -Direction Inbound -LocalPort 5501 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5501 used for?

Port 5501 is assigned by IANA to fcp-addr-srvr2 (fcp-addr-srvr2).

Is port 5501 TCP or UDP?

Port 5501 is registered for TCP and UDP.

Is it safe to open port 5501?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 5501 is open?

On Linux run "ss -ltnup 'sport = :5501'", on macOS "lsof -nP -i :5501", and on Windows "netstat -ano | findstr :5501" to see the local process. From another machine, "nmap -p 5501 <host>" shows whether it is reachable.

05 Related
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