CyberHunter
Local dataset, no network
// Databases & caches

Port 6100: SynchroNet-db

Port 6100 is assigned by IANA to synchronet-db (SynchroNet-db).

6100

How synchronet-db works

Databases & caches
app:6100synchronet-db app:6100synchronet-db

The application sends a SQL query to the synchronet-db server on port 6100, 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 6100 dangerous?

We have no specific security note for port 6100. 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 6100

ServicePortTransportDescriptionReferenceUpdated
synchronet-db 6100 TCP, UDP SynchroNet-db
Reported: Known Unauthorized Use on port 6100
 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 6100, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6100'      # process listening on 6100
sudo lsof -nP -i :6100

macOS

sudo lsof -nP -i :6100

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6100 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6100
netstat -ano | findstr :6100

From another machine

nmap -p 6100 -sV <host>
sudo nmap -sU -p 6100 <host>
nc -zv <host> 6100

Block it in the firewall

sudo ufw deny 6100/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6100" -Direction Inbound -LocalPort 6100 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6100 used for?

Port 6100 is assigned by IANA to synchronet-db (SynchroNet-db).

Is port 6100 TCP or UDP?

Port 6100 is registered for TCP and UDP.

Is it safe to open port 6100?

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 6100 is open?

On Linux run "ss -ltnup 'sport = :6100'", on macOS "lsof -nP -i :6100", and on Windows "netstat -ano | findstr :6100" to see the local process. From another machine, "nmap -p 6100 <host>" shows whether it is reachable.

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