CyberHunter
Local dataset, no network
// Other services

Port 287: K-BLOCK

Port 287 is assigned by IANA to k-block (K-BLOCK).

287

How k-block works

Other services
client:287k-blockresponse client:287k-blockresponse

The client sends a request to port 287 and the k-block 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 287 dangerous?

We have no specific security note for port 287. 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 287

ServicePortTransportDescriptionReferenceUpdated
k-block 287 TCP, UDP K-BLOCK - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 287, and is it reachable?

Linux

sudo ss -ltnup 'sport = :287'      # process listening on 287
sudo lsof -nP -i :287

macOS

sudo lsof -nP -i :287

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 287 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 287
netstat -ano | findstr :287

From another machine

nmap -p 287 -sV <host>
sudo nmap -sU -p 287 <host>
nc -zv <host> 287

Block it in the firewall

sudo ufw deny 287/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 287" -Direction Inbound -LocalPort 287 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 287 used for?

Port 287 is assigned by IANA to k-block (K-BLOCK).

Is port 287 TCP or UDP?

Port 287 is registered for TCP and UDP.

Is it safe to open port 287?

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 287 is open?

On Linux run "ss -ltnup 'sport = :287'", on macOS "lsof -nP -i :287", and on Windows "netstat -ano | findstr :287" to see the local process. From another machine, "nmap -p 287 <host>" shows whether it is reachable.

05 Related
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