42
WINS / nameserver
Medium RiskTCP/UDP — DNS
Port Overview
Port Number
42
Service Name
WINS / nameserver
Transport Protocol
TCP/UDP
Category
DNS
Security Risk
Medium
Port Range
Well-Known (0-1023)
What is Port 42?
Originally assigned as the Host Name Server protocol on ARPANET, port 42 was later repurposed by Microsoft for Windows Internet Name Service (WINS), which resolves NetBIOS names to IP addresses. WINS is a legacy name resolution system superseded by DNS and Active Directory. Exposure of WINS on the internet poses reconnaissance and potential exploitation risks.
TCP/UDP
DNS
Security Considerations
Port 42 (WINS / nameserver) is classified as medium risk. While this service is commonly exposed, consider using encrypted alternatives where available.
Recommendation: Keep the service updated. Monitor logs for unusual activity.