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// Other services

Port 4027: bitxpress

Port 4027 is assigned by IANA to bxp (bitxpress).

4027

How bxp works

Other services
client:4027bxpresponse client:4027bxpresponse

The client sends a request to port 4027 and the bxp 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 4027 dangerous?

We have no specific security note for port 4027. 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 4027

ServicePortTransportDescriptionReferenceUpdated
bxp 4027 TCP, UDP bitxpress - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4027, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4027'      # process listening on 4027
sudo lsof -nP -i :4027

macOS

sudo lsof -nP -i :4027

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4027 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4027
netstat -ano | findstr :4027

From another machine

nmap -p 4027 -sV <host>
sudo nmap -sU -p 4027 <host>
nc -zv <host> 4027

Block it in the firewall

sudo ufw deny 4027/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4027" -Direction Inbound -LocalPort 4027 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4027 used for?

Port 4027 is assigned by IANA to bxp (bitxpress).

Is port 4027 TCP or UDP?

Port 4027 is registered for TCP and UDP.

Is it safe to open port 4027?

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 4027 is open?

On Linux run "ss -ltnup 'sport = :4027'", on macOS "lsof -nP -i :4027", and on Windows "netstat -ano | findstr :4027" to see the local process. From another machine, "nmap -p 4027 <host>" shows whether it is reachable.

05 Related
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