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// Other services

Port 1861: LeCroy VICP

Port 1861 is assigned by IANA to lecroy-vicp (LeCroy VICP).

1861

How lecroy-vicp works

Other services
client:1861lecroy-vicpresponse client:1861lecroy-vicpresponse

The client sends a request to port 1861 and the lecroy-vicp 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 1861 dangerous?

We have no specific security note for port 1861. 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 1861

ServicePortTransportDescriptionReferenceUpdated
lecroy-vicp 1861 TCP, UDP LeCroy VICP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1861, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1861'      # process listening on 1861
sudo lsof -nP -i :1861

macOS

sudo lsof -nP -i :1861

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1861 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1861
netstat -ano | findstr :1861

From another machine

nmap -p 1861 -sV <host>
sudo nmap -sU -p 1861 <host>
nc -zv <host> 1861

Block it in the firewall

sudo ufw deny 1861/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1861" -Direction Inbound -LocalPort 1861 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1861 used for?

Port 1861 is assigned by IANA to lecroy-vicp (LeCroy VICP).

Is port 1861 TCP or UDP?

Port 1861 is registered for TCP and UDP.

Is it safe to open port 1861?

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 1861 is open?

On Linux run "ss -ltnup 'sport = :1861'", on macOS "lsof -nP -i :1861", and on Windows "netstat -ano | findstr :1861" to see the local process. From another machine, "nmap -p 1861 <host>" shows whether it is reachable.

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