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// Other services

Port 365: DTK

Port 365 is assigned by IANA to dtk (DTK).

365

How dtk works

Other services
client:365dtkresponse client:365dtkresponse

The client sends a request to port 365 and the dtk 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 365 dangerous?

We have no specific security note for port 365. 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 365

ServicePortTransportDescriptionReferenceUpdated
dtk 365 TCP, UDP DTK - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 365, and is it reachable?

Linux

sudo ss -ltnup 'sport = :365'      # process listening on 365
sudo lsof -nP -i :365

macOS

sudo lsof -nP -i :365

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 365 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 365
netstat -ano | findstr :365

From another machine

nmap -p 365 -sV <host>
sudo nmap -sU -p 365 <host>
nc -zv <host> 365

Block it in the firewall

sudo ufw deny 365/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 365" -Direction Inbound -LocalPort 365 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 365 used for?

Port 365 is assigned by IANA to dtk (DTK).

Is port 365 TCP or UDP?

Port 365 is registered for TCP and UDP.

Is it safe to open port 365?

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 365 is open?

On Linux run "ss -ltnup 'sport = :365'", on macOS "lsof -nP -i :365", and on Windows "netstat -ano | findstr :365" to see the local process. From another machine, "nmap -p 365 <host>" shows whether it is reachable.

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