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Port 36443 (m2ap)

IANA assigns port 36443 to m2ap: M2 Application Part.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
m2ap SCTP M2 Application Part Dario S Tonesi -

Registry dates for this port: registered 2011-02-07.

Check what is listening on port 36443

Linux: is anything listening on TCP 36443?
sudo ss -tlnp 'sport = :36443'
Linux / macOS: which process owns the port
sudo lsof -nP -i :36443
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':36443 '
Windows (Command Prompt)
netstat -ano | findstr :36443
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 36443 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 36443
From Windows
Test-NetConnection HOST -Port 36443

Block port 36443 in the firewall

ufw
sudo ufw deny 36443/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 36443 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 36443 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 36443' -Direction Inbound -Protocol TCP -LocalPort 36443 -Action Block

Related ports

36423slmap36424nq-ap36444m3ap36462xw-control

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