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Port 11997 (wmereceiving)

IANA assigns port 11997 to wmereceiving: WorldMailExpress.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
wmereceiving SCTP WorldMailExpress Greg Foutz -

Registry dates for this port: registered 2006-03.

Check what is listening on port 11997

Linux: is anything listening on TCP 11997?
sudo ss -tlnp 'sport = :11997'
Linux / macOS: which process owns the port
sudo lsof -nP -i :11997
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':11997 '
Windows (Command Prompt)
netstat -ano | findstr :11997
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 11997 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 11997
From Windows
Test-NetConnection HOST -Port 11997

Block port 11997 in the firewall

ufw
sudo ufw deny 11997/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 11997 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 11997 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 11997' -Direction Inbound -Protocol TCP -LocalPort 11997 -Action Block

Related ports

11967sysinfo-sp11971tibsd11998wmedistribution11999wmereporting

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.