CyberHunter
Local dataset, no network
// Other services

Port 9753: rasadv

Port 9753 is assigned by IANA to rasadv (rasadv).

9753

How rasadv works

Other services
client:9753rasadvresponse client:9753rasadvresponse

The client sends a request to port 9753 and the rasadv 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 9753 dangerous?

We have no specific security note for port 9753. 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 9753

ServicePortTransportDescriptionReferenceUpdated
rasadv 9753 TCP, UDP rasadv - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 9753, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9753'      # process listening on 9753
sudo lsof -nP -i :9753

macOS

sudo lsof -nP -i :9753

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9753 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9753
netstat -ano | findstr :9753

From another machine

nmap -p 9753 -sV <host>
sudo nmap -sU -p 9753 <host>
nc -zv <host> 9753

Block it in the firewall

sudo ufw deny 9753/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9753" -Direction Inbound -LocalPort 9753 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9753 used for?

Port 9753 is assigned by IANA to rasadv (rasadv).

Is port 9753 TCP or UDP?

Port 9753 is registered for TCP and UDP.

Is it safe to open port 9753?

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 9753 is open?

On Linux run "ss -ltnup 'sport = :9753'", on macOS "lsof -nP -i :9753", and on Windows "netstat -ano | findstr :9753" to see the local process. From another machine, "nmap -p 9753 <host>" shows whether it is reachable.

05 Related
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