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// Other services

Port 62: ACA Services

Port 62 is assigned by IANA to acas (ACA Services).

62

How acas works

Other services
client:62acasresponse client:62acasresponse

The client sends a request to port 62 and the acas 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 62 dangerous?

We have no specific security note for port 62. 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 62

ServicePortTransportDescriptionReferenceUpdated
acas 62 TCP, UDP ACA Services - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 62, and is it reachable?

Linux

sudo ss -ltnup 'sport = :62'      # process listening on 62
sudo lsof -nP -i :62

macOS

sudo lsof -nP -i :62

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 62 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 62
netstat -ano | findstr :62

From another machine

nmap -p 62 -sV <host>
sudo nmap -sU -p 62 <host>
nc -zv <host> 62

Block it in the firewall

sudo ufw deny 62/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 62" -Direction Inbound -LocalPort 62 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 62 used for?

Port 62 is assigned by IANA to acas (ACA Services).

Is port 62 TCP or UDP?

Port 62 is registered for TCP and UDP.

Is it safe to open port 62?

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 62 is open?

On Linux run "ss -ltnup 'sport = :62'", on macOS "lsof -nP -i :62", and on Windows "netstat -ano | findstr :62" to see the local process. From another machine, "nmap -p 62 <host>" shows whether it is reachable.

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