CyberHunter
Local dataset, no network
// Other services

Port 2851: webemshttp

Port 2851 is assigned by IANA to webemshttp (webemshttp).

2851

How webemshttp works

Other services
client:2851webemshttpresponse client:2851webemshttpresponse

The client sends a request to port 2851 and the webemshttp 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 2851 dangerous?

We have no specific security note for port 2851. 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 2851

ServicePortTransportDescriptionReferenceUpdated
webemshttp 2851 TCP, UDP webemshttp - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2851, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2851'      # process listening on 2851
sudo lsof -nP -i :2851

macOS

sudo lsof -nP -i :2851

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2851 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2851
netstat -ano | findstr :2851

From another machine

nmap -p 2851 -sV <host>
sudo nmap -sU -p 2851 <host>
nc -zv <host> 2851

Block it in the firewall

sudo ufw deny 2851/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2851" -Direction Inbound -LocalPort 2851 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2851 used for?

Port 2851 is assigned by IANA to webemshttp (webemshttp).

Is port 2851 TCP or UDP?

Port 2851 is registered for TCP and UDP.

Is it safe to open port 2851?

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 2851 is open?

On Linux run "ss -ltnup 'sport = :2851'", on macOS "lsof -nP -i :2851", and on Windows "netstat -ano | findstr :2851" to see the local process. From another machine, "nmap -p 2851 <host>" shows whether it is reachable.

05 Related
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