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// Other services

Port 3778: Cutler-Hammer IT Port

Port 3778 is assigned by IANA to c-h-it-port (Cutler-Hammer IT Port).

3778

How c-h-it-port works

Other services
client:3778c-h-it-portresponse client:3778c-h-it-portresponse

The client sends a request to port 3778 and the c-h-it-port 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 3778 dangerous?

We have no specific security note for port 3778. 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 3778

ServicePortTransportDescriptionReferenceUpdated
c-h-it-port 3778 TCP, UDP Cutler-Hammer IT Port - 2003-06

// source: IANA service name and port number registry

03 Check it

Which program uses port 3778, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3778'      # process listening on 3778
sudo lsof -nP -i :3778

macOS

sudo lsof -nP -i :3778

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3778 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3778
netstat -ano | findstr :3778

From another machine

nmap -p 3778 -sV <host>
sudo nmap -sU -p 3778 <host>
nc -zv <host> 3778

Block it in the firewall

sudo ufw deny 3778/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3778" -Direction Inbound -LocalPort 3778 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3778 used for?

Port 3778 is assigned by IANA to c-h-it-port (Cutler-Hammer IT Port).

Is port 3778 TCP or UDP?

Port 3778 is registered for TCP and UDP.

Is it safe to open port 3778?

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 3778 is open?

On Linux run "ss -ltnup 'sport = :3778'", on macOS "lsof -nP -i :3778", and on Windows "netstat -ano | findstr :3778" to see the local process. From another machine, "nmap -p 3778 <host>" shows whether it is reachable.

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