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// Other services

Port 9899: SCTP TUNNELING

Port 9899 is assigned by IANA to sctp-tunneling (SCTP TUNNELING).

9899

How sctp-tunneling works

Other services
client:9899sctp-tunnelingresponse client:9899sctp-tunnelingresponse

The client sends a request to port 9899 and the sctp-tunneling 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 9899 dangerous?

We have no specific security note for port 9899. 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 9899

ServicePortTransportDescriptionReferenceUpdated
sctp-tunneling 9899 UDP SCTP TUNNELING RFC 6951 2013-04-10
-9899-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 9899, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9899'      # process listening on 9899
sudo lsof -nP -i :9899

macOS

sudo lsof -nP -i :9899

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9899 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9899
netstat -ano | findstr :9899

From another machine

nmap -p 9899 -sV <host>
sudo nmap -sU -p 9899 <host>
nc -zv <host> 9899

Block it in the firewall

sudo ufw deny 9899/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9899" -Direction Inbound -LocalPort 9899 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 9899 used for?

Port 9899 is assigned by IANA to sctp-tunneling (SCTP TUNNELING).

Is port 9899 TCP or UDP?

Port 9899 is registered for UDP.

Is it safe to open port 9899?

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 9899 is open?

On Linux run "ss -ltnup 'sport = :9899'", on macOS "lsof -nP -i :9899", and on Windows "netstat -ano | findstr :9899" to see the local process. From another machine, "nmap -p 9899 <host>" shows whether it is reachable.

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