- 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.
Port 3938: Oracle dbControl Agent po
Port 3938 is assigned by IANA to dbcontrol_agent (Oracle dbControl Agent po), dbcontrol-agent (Oracle dbControl Agent po IANA assigned this well-formed service name as a replacement for "dbcontrol_agent".).
3938
How dbcontrol_agent works
Databases & cachesThe application sends a SQL query to the dbcontrol_agent server on port 3938, 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
- Assigned2 registered services
- Range
- Registered (1024-49151)
- Category
- Databases & caches
Is port 3938 dangerous?
We have no specific security note for port 3938. Its risk depends on the program actually listening on it. General advice for databases & caches services:
IANA registry entries for port 3938
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| dbcontrol_agent | 3938 | TCP, UDP | Oracle dbControl Agent po | - | 2003-11 |
| dbcontrol-agent | 3938 | TCP, UDP | Oracle dbControl Agent po IANA assigned this well-formed service name as a replacement for "dbcontrol_agent". | - | 2003-11 |
// source: IANA service name and port number registry
Which program uses port 3938, and is it reachable?
Linux
sudo ss -ltnup 'sport = :3938' # process listening on 3938
sudo lsof -nP -i :3938macOS
sudo lsof -nP -i :3938
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3938 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 3938 netstat -ano | findstr :3938
From another machine
nmap -p 3938 -sV <host> sudo nmap -sU -p 3938 <host> nc -zv <host> 3938
Block it in the firewall
sudo ufw deny 3938/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 3938" -Direction Inbound -LocalPort 3938 -Protocol TCP -Action Block # Windows
What is port 3938 used for?
Port 3938 is assigned by IANA to dbcontrol_agent (Oracle dbControl Agent po), dbcontrol-agent (Oracle dbControl Agent po IANA assigned this well-formed service name as a replacement for "dbcontrol_agent".).
Is port 3938 TCP or UDP?
Port 3938 is registered for TCP and UDP.
Is it safe to open port 3938?
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 3938 is open?
On Linux run "ss -ltnup 'sport = :3938'", on macOS "lsof -nP -i :3938", and on Windows "netstat -ano | findstr :3938" to see the local process. From another machine, "nmap -p 3938 <host>" shows whether it is reachable.
Other databases & caches ports
: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