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// Other services

Port 5193: AmericaOnline3

Port 5193 is assigned by IANA to aol-3 (AmericaOnline3).

5193

How aol-3 works

Other services
client:5193aol-3response client:5193aol-3response

The client sends a request to port 5193 and the aol-3 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 5193 dangerous?

We have no specific security note for port 5193. 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 5193

ServicePortTransportDescriptionReferenceUpdated
aol-3 5193 TCP, UDP AmericaOnline3 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 5193, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5193'      # process listening on 5193
sudo lsof -nP -i :5193

macOS

sudo lsof -nP -i :5193

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5193 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5193
netstat -ano | findstr :5193

From another machine

nmap -p 5193 -sV <host>
sudo nmap -sU -p 5193 <host>
nc -zv <host> 5193

Block it in the firewall

sudo ufw deny 5193/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5193" -Direction Inbound -LocalPort 5193 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5193 used for?

Port 5193 is assigned by IANA to aol-3 (AmericaOnline3).

Is port 5193 TCP or UDP?

Port 5193 is registered for TCP and UDP.

Is it safe to open port 5193?

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 5193 is open?

On Linux run "ss -ltnup 'sport = :5193'", on macOS "lsof -nP -i :5193", and on Windows "netstat -ano | findstr :5193" to see the local process. From another machine, "nmap -p 5193 <host>" shows whether it is reachable.

05 Related
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