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// Other services

Port 24601: UDP-based IP-Layer Capacity and Performance Measurement protocol

Port 24601 is assigned by IANA to udpstp (UDP-based IP-Layer Capacity and Performance Measurement protocol).

24601

How udpstp works

Other services
client:24601udpstpresponse client:24601udpstpresponse

The client sends a request to port 24601 and the udpstp service answers.

Transport
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 24601 dangerous?

We have no specific security note for port 24601. 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 24601

ServicePortTransportDescriptionReferenceUpdated
udpstp 24601 UDP UDP-based IP-Layer Capacity and Performance Measurement protocol RFC 9946 2025-09-26
-24601-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 24601, and is it reachable?

Linux

sudo ss -ltnup 'sport = :24601'      # process listening on 24601
sudo lsof -nP -i :24601

macOS

sudo lsof -nP -i :24601

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 24601 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 24601
netstat -ano | findstr :24601

From another machine

nmap -p 24601 -sV <host>
sudo nmap -sU -p 24601 <host>
nc -zv <host> 24601

Block it in the firewall

sudo ufw deny 24601/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 24601" -Direction Inbound -LocalPort 24601 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 24601 used for?

Port 24601 is assigned by IANA to udpstp (UDP-based IP-Layer Capacity and Performance Measurement protocol).

Is port 24601 TCP or UDP?

Port 24601 is registered for UDP.

Is it safe to open port 24601?

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 24601 is open?

On Linux run "ss -ltnup 'sport = :24601'", on macOS "lsof -nP -i :24601", and on Windows "netstat -ano | findstr :24601" to see the local process. From another machine, "nmap -p 24601 <host>" shows whether it is reachable.

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