CyberHunter
Local dataset, no network
// Other services

Port 2533: SnifferServer

Port 2533 is assigned by IANA to snifferserver (SnifferServer).

2533

How snifferserver works

Other services
client:2533snifferserverresponse client:2533snifferserverresponse

The client sends a request to port 2533 and the snifferserver 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 2533 dangerous?

We have no specific security note for port 2533. 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 2533

ServicePortTransportDescriptionReferenceUpdated
snifferserver 2533 TCP, UDP SnifferServer - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2533, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2533'      # process listening on 2533
sudo lsof -nP -i :2533

macOS

sudo lsof -nP -i :2533

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2533 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2533
netstat -ano | findstr :2533

From another machine

nmap -p 2533 -sV <host>
sudo nmap -sU -p 2533 <host>
nc -zv <host> 2533

Block it in the firewall

sudo ufw deny 2533/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2533" -Direction Inbound -LocalPort 2533 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2533 used for?

Port 2533 is assigned by IANA to snifferserver (SnifferServer).

Is port 2533 TCP or UDP?

Port 2533 is registered for TCP and UDP.

Is it safe to open port 2533?

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 2533 is open?

On Linux run "ss -ltnup 'sport = :2533'", on macOS "lsof -nP -i :2533", and on Windows "netstat -ano | findstr :2533" to see the local process. From another machine, "nmap -p 2533 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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