CyberHunter
Local dataset, no network
// Other services

Port 9953: 9953

Port 9953 is assigned by IANA to acis (9953).

9953

How acis works

Other services
client:9953acisresponse client:9953acisresponse

The client sends a request to port 9953 and the acis 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 9953 dangerous?

We have no specific security note for port 9953. 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 9953

ServicePortTransportDescriptionReferenceUpdated
acis 9953 TCP, UDP 9953 - 2006-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 9953, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9953'      # process listening on 9953
sudo lsof -nP -i :9953

macOS

sudo lsof -nP -i :9953

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9953 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9953
netstat -ano | findstr :9953

From another machine

nmap -p 9953 -sV <host>
sudo nmap -sU -p 9953 <host>
nc -zv <host> 9953

Block it in the firewall

sudo ufw deny 9953/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9953" -Direction Inbound -LocalPort 9953 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9953 used for?

Port 9953 is assigned by IANA to acis (9953).

Is port 9953 TCP or UDP?

Port 9953 is registered for TCP and UDP.

Is it safe to open port 9953?

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 9953 is open?

On Linux run "ss -ltnup 'sport = :9953'", on macOS "lsof -nP -i :9953", and on Windows "netstat -ano | findstr :9953" to see the local process. From another machine, "nmap -p 9953 <host>" shows whether it is reachable.

05 Related
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