CyberHunter
Local dataset, no network
// Other services

Port 125: Locus PC-Interface Net Map Ser

Port 125 is assigned by IANA to locus-map (Locus PC-Interface Net Map Ser).

125

How locus-map works

Other services
client:125locus-mapresponse client:125locus-mapresponse

The client sends a request to port 125 and the locus-map 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 125 dangerous?

We have no specific security note for port 125. 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 125

ServicePortTransportDescriptionReferenceUpdated
locus-map 125 TCP, UDP Locus PC-Interface Net Map Ser - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 125, and is it reachable?

Linux

sudo ss -ltnup 'sport = :125'      # process listening on 125
sudo lsof -nP -i :125

macOS

sudo lsof -nP -i :125

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 125 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 125
netstat -ano | findstr :125

From another machine

nmap -p 125 -sV <host>
sudo nmap -sU -p 125 <host>
nc -zv <host> 125

Block it in the firewall

sudo ufw deny 125/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 125" -Direction Inbound -LocalPort 125 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 125 used for?

Port 125 is assigned by IANA to locus-map (Locus PC-Interface Net Map Ser).

Is port 125 TCP or UDP?

Port 125 is registered for TCP and UDP.

Is it safe to open port 125?

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 125 is open?

On Linux run "ss -ltnup 'sport = :125'", on macOS "lsof -nP -i :125", and on Windows "netstat -ano | findstr :125" to see the local process. From another machine, "nmap -p 125 <host>" shows whether it is reachable.

05 Related
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