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// Other services

Port 11998: WorldMailExpress

Port 11998 is assigned by IANA to wmedistribution (WorldMailExpress).

11998

How wmedistribution works

Other services
client:11998wmedistributionresponse client:11998wmedistributionresponse

The client sends a request to port 11998 and the wmedistribution 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 11998 dangerous?

We have no specific security note for port 11998. 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 11998

ServicePortTransportDescriptionReferenceUpdated
wmedistribution 11998 SCTP WorldMailExpress - 2006-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 11998, and is it reachable?

Linux

sudo ss -ltnup 'sport = :11998'      # process listening on 11998
sudo lsof -nP -i :11998

macOS

sudo lsof -nP -i :11998

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 11998 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 11998
netstat -ano | findstr :11998

From another machine

nmap -p 11998 -sV <host>
nc -zv <host> 11998

Block it in the firewall

sudo ufw deny 11998/sctp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 11998" -Direction Inbound -LocalPort 11998 -Protocol SCTP -Action Block  # Windows
04 FAQ
What is port 11998 used for?

Port 11998 is assigned by IANA to wmedistribution (WorldMailExpress).

Is port 11998 TCP or UDP?

Port 11998 is registered for SCTP.

Is it safe to open port 11998?

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 11998 is open?

On Linux run "ss -ltnup 'sport = :11998'", on macOS "lsof -nP -i :11998", and on Windows "netstat -ano | findstr :11998" to see the local process. From another machine, "nmap -p 11998 <host>" shows whether it is reachable.

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