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// Other services

Port 775:

Port 775 is assigned by IANA to acmaint_transd (), acmaint-transd (IANA assigned this well-formed service name as a replacement for "acmaint_transd".), entomb ().

775

How acmaint_transd works

Other services
client:775acmaint_transdresponse client:775acmaint_transdresponse

The client sends a request to port 775 and the acmaint_transd service answers.

Transport
UDP · TCP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned3 registered services
Range
Well-known (0-1023)
Category
Other services
01 Security

Is port 775 dangerous?

We have no specific security note for port 775. 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 775

ServicePortTransportDescriptionReferenceUpdated
acmaint_transd 775 UDP - -
acmaint-transd 775 UDP IANA assigned this well-formed service name as a replacement for "acmaint_transd". - -
entomb 775 TCP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 775, and is it reachable?

Linux

sudo ss -ltnup 'sport = :775'      # process listening on 775
sudo lsof -nP -i :775

macOS

sudo lsof -nP -i :775

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 775 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 775
netstat -ano | findstr :775

From another machine

nmap -p 775 -sV <host>
sudo nmap -sU -p 775 <host>
nc -zv <host> 775

Block it in the firewall

sudo ufw deny 775/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 775" -Direction Inbound -LocalPort 775 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 775 used for?

Port 775 is assigned by IANA to acmaint_transd (), acmaint-transd (IANA assigned this well-formed service name as a replacement for "acmaint_transd".), entomb ().

Is port 775 TCP or UDP?

Port 775 is registered for UDP and TCP.

Is it safe to open port 775?

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 775 is open?

On Linux run "ss -ltnup 'sport = :775'", on macOS "lsof -nP -i :775", and on Windows "netstat -ano | findstr :775" to see the local process. From another machine, "nmap -p 775 <host>" shows whether it is reachable.

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