CyberHunter
Local dataset, no network
// Other services

Port 3544: Teredo Port

Port 3544 is assigned by IANA to teredo (Teredo Port).

3544

How teredo works

Other services
client:3544teredoresponse client:3544teredoresponse

The client sends a request to port 3544 and the teredo 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 3544 dangerous?

We have no specific security note for port 3544. 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 3544

ServicePortTransportDescriptionReferenceUpdated
teredo 3544 TCP, UDP Teredo Port RFC 4380 -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3544, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3544'      # process listening on 3544
sudo lsof -nP -i :3544

macOS

sudo lsof -nP -i :3544

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3544 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3544
netstat -ano | findstr :3544

From another machine

nmap -p 3544 -sV <host>
sudo nmap -sU -p 3544 <host>
nc -zv <host> 3544

Block it in the firewall

sudo ufw deny 3544/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3544" -Direction Inbound -LocalPort 3544 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3544 used for?

Port 3544 is assigned by IANA to teredo (Teredo Port).

Is port 3544 TCP or UDP?

Port 3544 is registered for TCP and UDP.

Is it safe to open port 3544?

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 3544 is open?

On Linux run "ss -ltnup 'sport = :3544'", on macOS "lsof -nP -i :3544", and on Windows "netstat -ano | findstr :3544" to see the local process. From another machine, "nmap -p 3544 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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