CyberHunter
Local dataset, no network
// Other services

Port 11997: WorldMailExpress

Port 11997 is assigned by IANA to wmereceiving (WorldMailExpress).

11997

How wmereceiving works

Other services
client:11997wmereceivingresponse client:11997wmereceivingresponse

The client sends a request to port 11997 and the wmereceiving 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 11997 dangerous?

We have no specific security note for port 11997. 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 11997

ServicePortTransportDescriptionReferenceUpdated
wmereceiving 11997 SCTP WorldMailExpress - 2006-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 11997, and is it reachable?

Linux

sudo ss -ltnup 'sport = :11997'      # process listening on 11997
sudo lsof -nP -i :11997

macOS

sudo lsof -nP -i :11997

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 11997 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 11997
netstat -ano | findstr :11997

From another machine

nmap -p 11997 -sV <host>
nc -zv <host> 11997

Block it in the firewall

sudo ufw deny 11997/sctp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 11997" -Direction Inbound -LocalPort 11997 -Protocol SCTP -Action Block  # Windows
04 FAQ
What is port 11997 used for?

Port 11997 is assigned by IANA to wmereceiving (WorldMailExpress).

Is port 11997 TCP or UDP?

Port 11997 is registered for SCTP.

Is it safe to open port 11997?

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 11997 is open?

On Linux run "ss -ltnup 'sport = :11997'", on macOS "lsof -nP -i :11997", and on Windows "netstat -ano | findstr :11997" to see the local process. From another machine, "nmap -p 11997 <host>" shows whether it is reachable.

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