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// Databases & caches

Port 1551: HECMTL-DB

Port 1551 is assigned by IANA to hecmtl-db (HECMTL-DB).

1551

How hecmtl-db works

Databases & caches
app:1551hecmtl-db app:1551hecmtl-db

The application sends a SQL query to the hecmtl-db server on port 1551, which returns rows from its tables.

Transport
TCP · UDP
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
Databases & caches
01 Security

Is port 1551 dangerous?

We have no specific security note for port 1551. Its risk depends on the program actually listening on it. General advice for databases & caches services:

  • Bind the service to localhost or a private network, never to a public address.
  • Enable authentication, use per-application accounts and require TLS.
  • Watch for exposed Docker ports: publish them on 127.0.0.1 only.
02 Registry

IANA registry entries for port 1551

ServicePortTransportDescriptionReferenceUpdated
hecmtl-db 1551 TCP, UDP HECMTL-DB - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1551, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1551'      # process listening on 1551
sudo lsof -nP -i :1551

macOS

sudo lsof -nP -i :1551

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1551 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1551
netstat -ano | findstr :1551

From another machine

nmap -p 1551 -sV <host>
sudo nmap -sU -p 1551 <host>
nc -zv <host> 1551

Block it in the firewall

sudo ufw deny 1551/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1551" -Direction Inbound -LocalPort 1551 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1551 used for?

Port 1551 is assigned by IANA to hecmtl-db (HECMTL-DB).

Is port 1551 TCP or UDP?

Port 1551 is registered for TCP and UDP.

Is it safe to open port 1551?

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. Bind the service to localhost or a private network, never to a public address.

How do I check if port 1551 is open?

On Linux run "ss -ltnup 'sport = :1551'", on macOS "lsof -nP -i :1551", and on Windows "netstat -ano | findstr :1551" to see the local process. From another machine, "nmap -p 1551 <host>" shows whether it is reachable.

05 Related
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