CyberHunter
Local dataset, no network
// Other services

Port 758:

Port 758 is assigned by IANA to nlogin ().

758

How nlogin works

Other services
client:758nloginresponse client:758nloginresponse

The client sends a request to port 758 and the nlogin 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 758 dangerous?

We have no specific security note for port 758. 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 758

ServicePortTransportDescriptionReferenceUpdated
nlogin 758 TCP, UDP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 758, and is it reachable?

Linux

sudo ss -ltnup 'sport = :758'      # process listening on 758
sudo lsof -nP -i :758

macOS

sudo lsof -nP -i :758

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 758 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 758
netstat -ano | findstr :758

From another machine

nmap -p 758 -sV <host>
sudo nmap -sU -p 758 <host>
nc -zv <host> 758

Block it in the firewall

sudo ufw deny 758/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 758" -Direction Inbound -LocalPort 758 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 758 used for?

Port 758 is assigned by IANA to nlogin ().

Is port 758 TCP or UDP?

Port 758 is registered for TCP and UDP.

Is it safe to open port 758?

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 758 is open?

On Linux run "ss -ltnup 'sport = :758'", on macOS "lsof -nP -i :758", and on Windows "netstat -ano | findstr :758" to see the local process. From another machine, "nmap -p 758 <host>" shows whether it is reachable.

05 Related
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