CyberHunter
Local dataset, no network
// Other services

Port 888: AccessBuilder

Port 888 is assigned by IANA to accessbuilder (AccessBuilder), cddbp (CD Database Protocol).

888

How accessbuilder works

Other services
client:888accessbuilderresponse client:888accessbuilderresponse

The client sends a request to port 888 and the accessbuilder service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Well-known (0-1023)
Category
Other services
01 Security

Is port 888 dangerous?

We have no specific security note for port 888. 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 888

ServicePortTransportDescriptionReferenceUpdated
accessbuilder 888 TCP, UDP AccessBuilder - -
cddbp 888 TCP CD Database Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 888, and is it reachable?

Linux

sudo ss -ltnup 'sport = :888'      # process listening on 888
sudo lsof -nP -i :888

macOS

sudo lsof -nP -i :888

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 888 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 888
netstat -ano | findstr :888

From another machine

nmap -p 888 -sV <host>
sudo nmap -sU -p 888 <host>
nc -zv <host> 888

Block it in the firewall

sudo ufw deny 888/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 888" -Direction Inbound -LocalPort 888 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 888 used for?

Port 888 is assigned by IANA to accessbuilder (AccessBuilder), cddbp (CD Database Protocol).

Is port 888 TCP or UDP?

Port 888 is registered for TCP and UDP.

Is it safe to open port 888?

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 888 is open?

On Linux run "ss -ltnup 'sport = :888'", on macOS "lsof -nP -i :888", and on Windows "netstat -ano | findstr :888" to see the local process. From another machine, "nmap -p 888 <host>" shows whether it is reachable.

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