CyberHunter
Local dataset, no network
// Other services

Port 764:

Port 764 is assigned by IANA to omserv ().

764

How omserv works

Other services
client:764omservresponse client:764omservresponse

The client sends a request to port 764 and the omserv 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 764 dangerous?

We have no specific security note for port 764. 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 764

ServicePortTransportDescriptionReferenceUpdated
omserv 764 TCP, UDP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 764, and is it reachable?

Linux

sudo ss -ltnup 'sport = :764'      # process listening on 764
sudo lsof -nP -i :764

macOS

sudo lsof -nP -i :764

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 764 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 764
netstat -ano | findstr :764

From another machine

nmap -p 764 -sV <host>
sudo nmap -sU -p 764 <host>
nc -zv <host> 764

Block it in the firewall

sudo ufw deny 764/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 764" -Direction Inbound -LocalPort 764 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 764 used for?

Port 764 is assigned by IANA to omserv ().

Is port 764 TCP or UDP?

Port 764 is registered for TCP and UDP.

Is it safe to open port 764?

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 764 is open?

On Linux run "ss -ltnup 'sport = :764'", on macOS "lsof -nP -i :764", and on Windows "netstat -ano | findstr :764" to see the local process. From another machine, "nmap -p 764 <host>" shows whether it is reachable.

05 Related
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