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// Other services

Port 18888: APCNECMP

Port 18888 is assigned by IANA to apc-necmp (APCNECMP).

18888

How apc-necmp works

Other services
client:18888apc-necmpresponse client:18888apc-necmpresponse

The client sends a request to port 18888 and the apc-necmp 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 18888 dangerous?

We have no specific security note for port 18888. 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 18888

ServicePortTransportDescriptionReferenceUpdated
apc-necmp 18888 TCP, UDP APCNECMP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 18888, and is it reachable?

Linux

sudo ss -ltnup 'sport = :18888'      # process listening on 18888
sudo lsof -nP -i :18888

macOS

sudo lsof -nP -i :18888

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 18888 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 18888
netstat -ano | findstr :18888

From another machine

nmap -p 18888 -sV <host>
sudo nmap -sU -p 18888 <host>
nc -zv <host> 18888

Block it in the firewall

sudo ufw deny 18888/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 18888" -Direction Inbound -LocalPort 18888 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 18888 used for?

Port 18888 is assigned by IANA to apc-necmp (APCNECMP).

Is port 18888 TCP or UDP?

Port 18888 is registered for TCP and UDP.

Is it safe to open port 18888?

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 18888 is open?

On Linux run "ss -ltnup 'sport = :18888'", on macOS "lsof -nP -i :18888", and on Windows "netstat -ano | findstr :18888" to see the local process. From another machine, "nmap -p 18888 <host>" shows whether it is reachable.

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