CyberHunter
Local dataset, no network
// Other services

Port 169: SEND

Port 169 is assigned by IANA to send (SEND).

169

How send works

Other services
client:169sendresponse client:169sendresponse

The client sends a request to port 169 and the send 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 169 dangerous?

We have no specific security note for port 169. 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 169

ServicePortTransportDescriptionReferenceUpdated
send 169 TCP, UDP SEND - 2019-04-22

// source: IANA service name and port number registry

03 Check it

Which program uses port 169, and is it reachable?

Linux

sudo ss -ltnup 'sport = :169'      # process listening on 169
sudo lsof -nP -i :169

macOS

sudo lsof -nP -i :169

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 169 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 169
netstat -ano | findstr :169

From another machine

nmap -p 169 -sV <host>
sudo nmap -sU -p 169 <host>
nc -zv <host> 169

Block it in the firewall

sudo ufw deny 169/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 169" -Direction Inbound -LocalPort 169 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 169 used for?

Port 169 is assigned by IANA to send (SEND).

Is port 169 TCP or UDP?

Port 169 is registered for TCP and UDP.

Is it safe to open port 169?

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 169 is open?

On Linux run "ss -ltnup 'sport = :169'", on macOS "lsof -nP -i :169", and on Windows "netstat -ano | findstr :169" to see the local process. From another machine, "nmap -p 169 <host>" shows whether it is reachable.

05 Related
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