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// Other services

Port 2445: DTN1

Port 2445 is assigned by IANA to dtn1 (DTN1).

2445

How dtn1 works

Other services
client:2445dtn1response client:2445dtn1response

The client sends a request to port 2445 and the dtn1 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 2445 dangerous?

We have no specific security note for port 2445. 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 2445

ServicePortTransportDescriptionReferenceUpdated
dtn1 2445 TCP, UDP DTN1 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2445, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2445'      # process listening on 2445
sudo lsof -nP -i :2445

macOS

sudo lsof -nP -i :2445

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2445 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2445
netstat -ano | findstr :2445

From another machine

nmap -p 2445 -sV <host>
sudo nmap -sU -p 2445 <host>
nc -zv <host> 2445

Block it in the firewall

sudo ufw deny 2445/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2445" -Direction Inbound -LocalPort 2445 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2445 used for?

Port 2445 is assigned by IANA to dtn1 (DTN1).

Is port 2445 TCP or UDP?

Port 2445 is registered for TCP and UDP.

Is it safe to open port 2445?

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 2445 is open?

On Linux run "ss -ltnup 'sport = :2445'", on macOS "lsof -nP -i :2445", and on Windows "netstat -ano | findstr :2445" to see the local process. From another machine, "nmap -p 2445 <host>" shows whether it is reachable.

05 Related
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