CyberHunter
Local dataset, no network
// Other services

Port 8128: PayCash Online Protocol

Port 8128 is assigned by IANA to paycash-online (PayCash Online Protocol).

8128

How paycash-online works

Other services
client:8128paycash-onlineresponse client:8128paycash-onlineresponse

The client sends a request to port 8128 and the paycash-online 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 8128 dangerous?

We have no specific security note for port 8128. 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 8128

ServicePortTransportDescriptionReferenceUpdated
paycash-online 8128 TCP, UDP PayCash Online Protocol - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 8128, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8128'      # process listening on 8128
sudo lsof -nP -i :8128

macOS

sudo lsof -nP -i :8128

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8128 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8128
netstat -ano | findstr :8128

From another machine

nmap -p 8128 -sV <host>
sudo nmap -sU -p 8128 <host>
nc -zv <host> 8128

Block it in the firewall

sudo ufw deny 8128/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8128" -Direction Inbound -LocalPort 8128 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 8128 used for?

Port 8128 is assigned by IANA to paycash-online (PayCash Online Protocol).

Is port 8128 TCP or UDP?

Port 8128 is registered for TCP and UDP.

Is it safe to open port 8128?

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 8128 is open?

On Linux run "ss -ltnup 'sport = :8128'", on macOS "lsof -nP -i :8128", and on Windows "netstat -ano | findstr :8128" to see the local process. From another machine, "nmap -p 8128 <host>" shows whether it is reachable.

05 Related
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