Nmap Oracle TNS Listener Enumeration
Feb 7, 2026
•
2 min read
Oracle:
Enumeration
Guides for enumerating Oracle TNS listeners, SIDs, and services
3 guides
•
Created Feb 7, 2026
•
Updated Mar 29, 2026
Oracle Listener Enumeration with ODAT
Feb 7, 2026
•
5 min read
tnsping and sqlplus Connectivity Checks
Feb 7, 2026
•
2 min read
Oracle enumeration targets the TNS listener on port 1521 to discover SIDs, service names, and version details. The listener itself often leaks the Oracle version, OS platform, and registered services before any authentication.
SID guessing and brute-forcing with tools like odat and sidguess reveal database instances. Once a valid SID is known, enumerate users, roles, and privileges. Default accounts (SCOTT, DBSNMP, SYSTEM) with known passwords are common on unpatched or development instances.