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66

Oracle SQL*NET

Low Risk

TCP/UDP — Database

Port Overview

Port Number 66
Service Name Oracle SQL*NET
Transport Protocol TCP/UDP
Category Database
Security Risk Low
Port Range Well-Known (0-1023)

What is Port 66?

Port 66 was historically associated with Oracle SQL*NET, an early version of Oracle's proprietary network protocol for database communication before it migrated to port 1521. This port is largely unused today as Oracle Net Services standardized on higher port numbers.

TCP/UDP Database

Security Considerations

Port 66 (Oracle SQL*NET) is classified as low risk. This service uses encryption or has a minimal attack surface, making it relatively safe to expose.

Recommendation: Standard security practices apply. Keep software updated and monitor access.

Related Ports — Database

118 SQL Services 156 SQL Service 210 ANSI Z39.50 635 RLZ DBase 800 mdbs_daemon 999 Applix 1433 MS SQL 1434 MS SQL Browser
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