CyberHunter
Local dataset, no network
// Other services

Port 1873: Fjmpjps

Port 1873 is assigned by IANA to fjmpjps (Fjmpjps).

1873

How fjmpjps works

Other services
client:1873fjmpjpsresponse client:1873fjmpjpsresponse

The client sends a request to port 1873 and the fjmpjps 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 1873 dangerous?

We have no specific security note for port 1873. 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 1873

ServicePortTransportDescriptionReferenceUpdated
fjmpjps 1873 TCP, UDP Fjmpjps - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1873, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1873'      # process listening on 1873
sudo lsof -nP -i :1873

macOS

sudo lsof -nP -i :1873

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1873 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1873
netstat -ano | findstr :1873

From another machine

nmap -p 1873 -sV <host>
sudo nmap -sU -p 1873 <host>
nc -zv <host> 1873

Block it in the firewall

sudo ufw deny 1873/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1873" -Direction Inbound -LocalPort 1873 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1873 used for?

Port 1873 is assigned by IANA to fjmpjps (Fjmpjps).

Is port 1873 TCP or UDP?

Port 1873 is registered for TCP and UDP.

Is it safe to open port 1873?

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 1873 is open?

On Linux run "ss -ltnup 'sport = :1873'", on macOS "lsof -nP -i :1873", and on Windows "netstat -ano | findstr :1873" to see the local process. From another machine, "nmap -p 1873 <host>" shows whether it is reachable.

05 Related
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