CyberHunter
Local dataset, no network
// Other services

Port 754: send

Port 754 is assigned by IANA to tell (send).

754

How tell works

Other services
client:754tellresponse client:754tellresponse

The client sends a request to port 754 and the tell 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 754 dangerous?

We have no specific security note for port 754. 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 754

ServicePortTransportDescriptionReferenceUpdated
tell 754 TCP, UDP send - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 754, and is it reachable?

Linux

sudo ss -ltnup 'sport = :754'      # process listening on 754
sudo lsof -nP -i :754

macOS

sudo lsof -nP -i :754

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 754 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 754
netstat -ano | findstr :754

From another machine

nmap -p 754 -sV <host>
sudo nmap -sU -p 754 <host>
nc -zv <host> 754

Block it in the firewall

sudo ufw deny 754/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 754" -Direction Inbound -LocalPort 754 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 754 used for?

Port 754 is assigned by IANA to tell (send).

Is port 754 TCP or UDP?

Port 754 is registered for TCP and UDP.

Is it safe to open port 754?

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 754 is open?

On Linux run "ss -ltnup 'sport = :754'", on macOS "lsof -nP -i :754", and on Windows "netstat -ano | findstr :754" to see the local process. From another machine, "nmap -p 754 <host>" shows whether it is reachable.

05 Related
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