Port 1526Oracle Listener Alt Port
TCP port 1526 is commonly used as an alternative port for Oracle Database Listener services. The Oracle Listener facilitates incoming client connections and routing to the database, playing a fundamental role in Oracle environments. Administrators might configure port 1526 instead of the default 1521 for security or network segmentation reasons..
- transport
- tcp
- in transit
- cleartext
- assignment
- unofficial
- risk
- 4/10
- lookups
- 12,958
single transport
payload readable on path
used by convention
caution
rank 290 of 993 · top 29%
Technical Details
what runs on :1526Oracle Database Listener is a critical component that manages client requests to Oracle Database services. It listens for incoming connection requests using the Oracle Net service, parses the connection string, and hands off the request to the appropriate database process. Typically, the listener uses TCP port 1521, but alternative ports, such as 1526, can be designated for multi-tenant environments, legacy support, or security considerations.
Configuring the listener to operate on port 1526 requires updating the listener.ora file on the database server, allowing administrators to run multiple listeners simultaneously or reduce exposure on conventional ports. This flexibility is especially valuable for managing multiple databases hosted on the same server and for isolating test or development environments.
Despite its alternative status, traffic over port 1526 functions identically to the default listener port. It handles various client protocols, supports features like Oracle Advanced Security, and integrates with enterprise authentication and authorization systems. Proper configuration ensures seamless connectivity across client tools, middleware, and integration platforms.
Security Information
exposure of :1526risk score
4/ 10caution
worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.
databases averages 4.0 across 58 ports — this one sits level with it.
in transit
cleartext
credentials and payloads are readable by anyone on path
assignment
unofficial
used by convention, not registered — what answers here varies by deployment
reachable over
tcp
every listening transport is another surface to filter at the edge
security overview
Common Vulnerabilities:
- Oracle Listener is a frequent target for reconnaissance, service enumeration, and brute-force attacks.
- Attackers may exploit misconfigurations or outdated listener security settings for unauthorized database access.
- Vulnerabilities can include credential guessing, unprotected administrative interfaces, and exposure to known exploits if the listener is not adequately patched.
Common Mitigations:
- Restrict access to listener ports (including 1526) via firewalls and network ACLs.
- Enforce strong authentication with Oracle’s password-protected listener configuration.
- Regularly update database software and apply Oracle Critical Patch Updates (CPUs).
- Enable logging and monitoring of listener activity to detect suspicious behavior.
- Use encryption (such as Oracle Advanced Security options) to prevent data interception during transit.
Related Ports
the 8 most looked-up other ports in databases — 58 ports carry that label.
| port | service | risk | |||
|---|---|---|---|---|---|
| :8882 | Atlasz Secure App Server | TCP | Web Services | caution | 66.9k |
| :9001 | ETL Service Manager | TCPUDP | Databases | caution | 28.6k |
| :2484 | Oracle SSL Listener | TCPUDPtls | Security | caution | 25.0k |
| :5495 | Applix TM1 Admin | TCP | Databases | caution | 24.8k |
| :591 | FileMaker Web Sharing | TCP | Web Services | caution | 23.1k |
| :1521 | Oracle TNS Listener | TCP | Security | caution | 19.6k |
| :21001 | AMLFilter Admin | TCP | Security | caution | 19.2k |
| :18206 | Audition FAM DB | TCPUDP | Databases | caution | 19.1k |
risk mix of the 8 listed
- caution100%
1 of 8 encrypted