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// Other services

Port 64: Communications Integrator (CI)

Port 64 is assigned by IANA to covia (Communications Integrator (CI)).

64

How covia works

Other services
client:64coviaresponse client:64coviaresponse

The client sends a request to port 64 and the covia 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 64 dangerous?

We have no specific security note for port 64. 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 64

ServicePortTransportDescriptionReferenceUpdated
covia 64 TCP, UDP Communications Integrator (CI) - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 64, and is it reachable?

Linux

sudo ss -ltnup 'sport = :64'      # process listening on 64
sudo lsof -nP -i :64

macOS

sudo lsof -nP -i :64

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 64 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 64
netstat -ano | findstr :64

From another machine

nmap -p 64 -sV <host>
sudo nmap -sU -p 64 <host>
nc -zv <host> 64

Block it in the firewall

sudo ufw deny 64/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 64" -Direction Inbound -LocalPort 64 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 64 used for?

Port 64 is assigned by IANA to covia (Communications Integrator (CI)).

Is port 64 TCP or UDP?

Port 64 is registered for TCP and UDP.

Is it safe to open port 64?

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 64 is open?

On Linux run "ss -ltnup 'sport = :64'", on macOS "lsof -nP -i :64", and on Windows "netstat -ano | findstr :64" to see the local process. From another machine, "nmap -p 64 <host>" shows whether it is reachable.

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