CyberHunter
Local dataset, no network
// Other services

Port 1874: Fjswapsnp

Port 1874 is assigned by IANA to fjswapsnp (Fjswapsnp).

1874

How fjswapsnp works

Other services
client:1874fjswapsnpresponse client:1874fjswapsnpresponse

The client sends a request to port 1874 and the fjswapsnp 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 1874 dangerous?

We have no specific security note for port 1874. 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 1874

ServicePortTransportDescriptionReferenceUpdated
fjswapsnp 1874 TCP, UDP Fjswapsnp - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1874, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1874'      # process listening on 1874
sudo lsof -nP -i :1874

macOS

sudo lsof -nP -i :1874

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1874 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1874
netstat -ano | findstr :1874

From another machine

nmap -p 1874 -sV <host>
sudo nmap -sU -p 1874 <host>
nc -zv <host> 1874

Block it in the firewall

sudo ufw deny 1874/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1874" -Direction Inbound -LocalPort 1874 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1874 used for?

Port 1874 is assigned by IANA to fjswapsnp (Fjswapsnp).

Is port 1874 TCP or UDP?

Port 1874 is registered for TCP and UDP.

Is it safe to open port 1874?

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 1874 is open?

On Linux run "ss -ltnup 'sport = :1874'", on macOS "lsof -nP -i :1874", and on Windows "netstat -ano | findstr :1874" to see the local process. From another machine, "nmap -p 1874 <host>" shows whether it is reachable.

05 Related
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