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// Other services

Port 4601: Piranha2

Port 4601 is assigned by IANA to piranha2 (Piranha2).

4601

How piranha2 works

Other services
client:4601piranha2response client:4601piranha2response

The client sends a request to port 4601 and the piranha2 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 4601 dangerous?

We have no specific security note for port 4601. 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 4601

ServicePortTransportDescriptionReferenceUpdated
piranha2 4601 TCP, UDP Piranha2 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4601, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4601'      # process listening on 4601
sudo lsof -nP -i :4601

macOS

sudo lsof -nP -i :4601

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4601 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4601
netstat -ano | findstr :4601

From another machine

nmap -p 4601 -sV <host>
sudo nmap -sU -p 4601 <host>
nc -zv <host> 4601

Block it in the firewall

sudo ufw deny 4601/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4601" -Direction Inbound -LocalPort 4601 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4601 used for?

Port 4601 is assigned by IANA to piranha2 (Piranha2).

Is port 4601 TCP or UDP?

Port 4601 is registered for TCP and UDP.

Is it safe to open port 4601?

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 4601 is open?

On Linux run "ss -ltnup 'sport = :4601'", on macOS "lsof -nP -i :4601", and on Windows "netstat -ano | findstr :4601" to see the local process. From another machine, "nmap -p 4601 <host>" shows whether it is reachable.

05 Related
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