CyberHunter
Local dataset, no network
// Other services

Port 440: sgcp

Port 440 is assigned by IANA to sgcp (sgcp).

440

How sgcp works

Other services
client:440sgcpresponse client:440sgcpresponse

The client sends a request to port 440 and the sgcp 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 440 dangerous?

We have no specific security note for port 440. 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 440

ServicePortTransportDescriptionReferenceUpdated
sgcp 440 TCP, UDP sgcp - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 440, and is it reachable?

Linux

sudo ss -ltnup 'sport = :440'      # process listening on 440
sudo lsof -nP -i :440

macOS

sudo lsof -nP -i :440

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 440 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 440
netstat -ano | findstr :440

From another machine

nmap -p 440 -sV <host>
sudo nmap -sU -p 440 <host>
nc -zv <host> 440

Block it in the firewall

sudo ufw deny 440/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 440" -Direction Inbound -LocalPort 440 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 440 used for?

Port 440 is assigned by IANA to sgcp (sgcp).

Is port 440 TCP or UDP?

Port 440 is registered for TCP and UDP.

Is it safe to open port 440?

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 440 is open?

On Linux run "ss -ltnup 'sport = :440'", on macOS "lsof -nP -i :440", and on Windows "netstat -ano | findstr :440" to see the local process. From another machine, "nmap -p 440 <host>" shows whether it is reachable.

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