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Port 1551 (hecmtl-db)

IANA assigns port 1551 to hecmtl-db: HECMTL-DB.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
hecmtl-db TCP HECMTL-DB Maxime Belanger -
hecmtl-db UDP HECMTL-DB Maxime Belanger -

Check what is listening on port 1551

Linux: is anything listening on TCP 1551?
sudo ss -tlnp 'sport = :1551'
Linux: UDP 1551
sudo ss -ulnp 'sport = :1551'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1551
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1551 '
Windows (Command Prompt)
netstat -ano | findstr :1551
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1551 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1551
From Windows
Test-NetConnection HOST -Port 1551
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1551

Block port 1551 in the firewall

ufw
sudo ufw deny 1551/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1551 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1551 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1551' -Direction Inbound -Protocol TCP -LocalPort 1551 -Action Block
ufw
sudo ufw deny 1551/udp
iptables
sudo iptables -A INPUT -p udp --dport 1551 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1551 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1551' -Direction Inbound -Protocol UDP -LocalPort 1551 -Action Block

Related ports

1549shivahose, shivasound15503m-image-lm1552pciarray1553sna-cs

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