CyberHunter
Local dataset, no network
// Other services

Port 283: rescap

Port 283 is assigned by IANA to rescap (rescap).

283

How rescap works

Other services
client:283rescapresponse client:283rescapresponse

The client sends a request to port 283 and the rescap 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 283 dangerous?

We have no specific security note for port 283. 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 283

ServicePortTransportDescriptionReferenceUpdated
rescap 283 TCP, UDP rescap - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 283, and is it reachable?

Linux

sudo ss -ltnup 'sport = :283'      # process listening on 283
sudo lsof -nP -i :283

macOS

sudo lsof -nP -i :283

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 283 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 283
netstat -ano | findstr :283

From another machine

nmap -p 283 -sV <host>
sudo nmap -sU -p 283 <host>
nc -zv <host> 283

Block it in the firewall

sudo ufw deny 283/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 283" -Direction Inbound -LocalPort 283 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 283 used for?

Port 283 is assigned by IANA to rescap (rescap).

Is port 283 TCP or UDP?

Port 283 is registered for TCP and UDP.

Is it safe to open port 283?

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 283 is open?

On Linux run "ss -ltnup 'sport = :283'", on macOS "lsof -nP -i :283", and on Windows "netstat -ano | findstr :283" to see the local process. From another machine, "nmap -p 283 <host>" shows whether it is reachable.

05 Related
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