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// Other services

Port 11999: WorldMailExpress

Port 11999 is assigned by IANA to wmereporting (WorldMailExpress).

11999

How wmereporting works

Other services
client:11999wmereportingresponse client:11999wmereportingresponse

The client sends a request to port 11999 and the wmereporting service answers.

Transport
SCTP
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 11999 dangerous?

We have no specific security note for port 11999. 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 11999

ServicePortTransportDescriptionReferenceUpdated
wmereporting 11999 SCTP WorldMailExpress - 2006-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 11999, and is it reachable?

Linux

sudo ss -ltnup 'sport = :11999'      # process listening on 11999
sudo lsof -nP -i :11999

macOS

sudo lsof -nP -i :11999

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 11999 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 11999
netstat -ano | findstr :11999

From another machine

nmap -p 11999 -sV <host>
nc -zv <host> 11999

Block it in the firewall

sudo ufw deny 11999/sctp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 11999" -Direction Inbound -LocalPort 11999 -Protocol SCTP -Action Block  # Windows
04 FAQ
What is port 11999 used for?

Port 11999 is assigned by IANA to wmereporting (WorldMailExpress).

Is port 11999 TCP or UDP?

Port 11999 is registered for SCTP.

Is it safe to open port 11999?

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 11999 is open?

On Linux run "ss -ltnup 'sport = :11999'", on macOS "lsof -nP -i :11999", and on Windows "netstat -ano | findstr :11999" to see the local process. From another machine, "nmap -p 11999 <host>" shows whether it is reachable.

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