CyberHunter
Local dataset, no network
// Other services

Port 188: Plus Five's MUMPS

Port 188 is assigned by IANA to mumps (Plus Five's MUMPS).

188

How mumps works

Other services
client:188mumpsresponse client:188mumpsresponse

The client sends a request to port 188 and the mumps 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 188 dangerous?

We have no specific security note for port 188. 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 188

ServicePortTransportDescriptionReferenceUpdated
mumps 188 TCP, UDP Plus Five's MUMPS - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 188, and is it reachable?

Linux

sudo ss -ltnup 'sport = :188'      # process listening on 188
sudo lsof -nP -i :188

macOS

sudo lsof -nP -i :188

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 188 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 188
netstat -ano | findstr :188

From another machine

nmap -p 188 -sV <host>
sudo nmap -sU -p 188 <host>
nc -zv <host> 188

Block it in the firewall

sudo ufw deny 188/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 188" -Direction Inbound -LocalPort 188 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 188 used for?

Port 188 is assigned by IANA to mumps (Plus Five's MUMPS).

Is port 188 TCP or UDP?

Port 188 is registered for TCP and UDP.

Is it safe to open port 188?

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 188 is open?

On Linux run "ss -ltnup 'sport = :188'", on macOS "lsof -nP -i :188", and on Windows "netstat -ano | findstr :188" to see the local process. From another machine, "nmap -p 188 <host>" shows whether it is reachable.

05 Related
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