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Port 5418 (mcntp)

IANA assigns port 5418 to mcntp: MCNTP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
mcntp TCP MCNTP Heiko Rupp -
mcntp UDP MCNTP Heiko Rupp -

Check what is listening on port 5418

Linux: is anything listening on TCP 5418?
sudo ss -tlnp 'sport = :5418'
Linux: UDP 5418
sudo ss -ulnp 'sport = :5418'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5418
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5418 '
Windows (Command Prompt)
netstat -ano | findstr :5418
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5418 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5418
From Windows
Test-NetConnection HOST -Port 5418
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5418

Block port 5418 in the firewall

ufw
sudo ufw deny 5418/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5418 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5418 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5418' -Direction Inbound -Protocol TCP -LocalPort 5418 -Action Block
ufw
sudo ufw deny 5418/udp
iptables
sudo iptables -A INPUT -p udp --dport 5418 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5418 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5418' -Direction Inbound -Protocol UDP -LocalPort 5418 -Action Block

Related ports

5416sns-gateway5417sns-agent5419dj-ice5420cylink-c

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