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// Other services

Port 2550: ADS

Port 2550 is assigned by IANA to ads (ADS).

2550

How ads works

Other services
client:2550adsresponse client:2550adsresponse

The client sends a request to port 2550 and the ads 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 2550 dangerous?

We have no specific security note for port 2550. 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 2550

ServicePortTransportDescriptionReferenceUpdated
ads 2550 TCP, UDP ADS - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2550, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2550'      # process listening on 2550
sudo lsof -nP -i :2550

macOS

sudo lsof -nP -i :2550

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2550 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2550
netstat -ano | findstr :2550

From another machine

nmap -p 2550 -sV <host>
sudo nmap -sU -p 2550 <host>
nc -zv <host> 2550

Block it in the firewall

sudo ufw deny 2550/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2550" -Direction Inbound -LocalPort 2550 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2550 used for?

Port 2550 is assigned by IANA to ads (ADS).

Is port 2550 TCP or UDP?

Port 2550 is registered for TCP and UDP.

Is it safe to open port 2550?

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 2550 is open?

On Linux run "ss -ltnup 'sport = :2550'", on macOS "lsof -nP -i :2550", and on Windows "netstat -ano | findstr :2550" to see the local process. From another machine, "nmap -p 2550 <host>" shows whether it is reachable.

05 Related
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