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// Other services

Port 3163: RES-SAP

Port 3163 is assigned by IANA to res-sap (RES-SAP).

3163

How res-sap works

Other services
client:3163res-sapresponse client:3163res-sapresponse

The client sends a request to port 3163 and the res-sap 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 3163 dangerous?

We have no specific security note for port 3163. 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 3163

ServicePortTransportDescriptionReferenceUpdated
res-sap 3163 TCP, UDP RES-SAP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3163, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3163'      # process listening on 3163
sudo lsof -nP -i :3163

macOS

sudo lsof -nP -i :3163

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3163 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3163
netstat -ano | findstr :3163

From another machine

nmap -p 3163 -sV <host>
sudo nmap -sU -p 3163 <host>
nc -zv <host> 3163

Block it in the firewall

sudo ufw deny 3163/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3163" -Direction Inbound -LocalPort 3163 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3163 used for?

Port 3163 is assigned by IANA to res-sap (RES-SAP).

Is port 3163 TCP or UDP?

Port 3163 is registered for TCP and UDP.

Is it safe to open port 3163?

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 3163 is open?

On Linux run "ss -ltnup 'sport = :3163'", on macOS "lsof -nP -i :3163", and on Windows "netstat -ano | findstr :3163" to see the local process. From another machine, "nmap -p 3163 <host>" shows whether it is reachable.

05 Related
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