CyberHunter
Local dataset, no network
// Other services

Port 25900: TASP Network Comm

Port 25900 is assigned by IANA to tasp-net (TASP Network Comm).

25900

How tasp-net works

Other services
client:25900tasp-netresponse client:25900tasp-netresponse

The client sends a request to port 25900 and the tasp-net 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 25900 dangerous?

We have no specific security note for port 25900. 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 25900

ServicePortTransportDescriptionReferenceUpdated
tasp-net 25900 TCP, UDP TASP Network Comm - 2004-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 25900, and is it reachable?

Linux

sudo ss -ltnup 'sport = :25900'      # process listening on 25900
sudo lsof -nP -i :25900

macOS

sudo lsof -nP -i :25900

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 25900 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 25900
netstat -ano | findstr :25900

From another machine

nmap -p 25900 -sV <host>
sudo nmap -sU -p 25900 <host>
nc -zv <host> 25900

Block it in the firewall

sudo ufw deny 25900/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 25900" -Direction Inbound -LocalPort 25900 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 25900 used for?

Port 25900 is assigned by IANA to tasp-net (TASP Network Comm).

Is port 25900 TCP or UDP?

Port 25900 is registered for TCP and UDP.

Is it safe to open port 25900?

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 25900 is open?

On Linux run "ss -ltnup 'sport = :25900'", on macOS "lsof -nP -i :25900", and on Windows "netstat -ano | findstr :25900" to see the local process. From another machine, "nmap -p 25900 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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