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// Databases & caches

Port 9093: Copycat database replication service

Port 9093 is assigned by IANA to copycat (Copycat database replication service).

9093

How copycat works

Databases & caches
app:9093copycat app:9093copycat

The application sends a SQL query to the copycat server on port 9093, which returns rows from its tables.

Transport
TCP
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 9093 dangerous?

We have no specific security note for port 9093. 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 9093

ServicePortTransportDescriptionReferenceUpdated
copycat 9093 TCP Copycat database replication service - 2012-03-15
-9093-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 9093, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9093'      # process listening on 9093
sudo lsof -nP -i :9093

macOS

sudo lsof -nP -i :9093

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9093 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9093
netstat -ano | findstr :9093

From another machine

nmap -p 9093 -sV <host>
nc -zv <host> 9093

Block it in the firewall

sudo ufw deny 9093/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9093" -Direction Inbound -LocalPort 9093 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9093 used for?

Port 9093 is assigned by IANA to copycat (Copycat database replication service).

Is port 9093 TCP or UDP?

Port 9093 is registered for TCP.

Is it safe to open port 9093?

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 9093 is open?

On Linux run "ss -ltnup 'sport = :9093'", on macOS "lsof -nP -i :9093", and on Windows "netstat -ano | findstr :9093" to see the local process. From another machine, "nmap -p 9093 <host>" shows whether it is reachable.

05 Related
:3306 MySQL / MariaDB tcp · udp · high risk :1433 Microsoft SQL Server tcp · udp · high risk :5432 PostgreSQL tcp · udp · high risk :6379 Redis tcp · critical risk :27017 MongoDB tcp · critical risk :9200 Elasticsearch tcp · udp · critical risk :1521 Oracle Database tcp · udp · high risk :11211 Memcached tcp · udp · high risk

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