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IPFYI
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991

NAS

Low Risk

TCP/UDP — Other

Port Overview

Port Number 991
Service Name NAS
Transport Protocol TCP/UDP
Category Other
Security Risk Low
Port Range Well-Known (0-1023)

What is Port 991?

Netnews Administration System (NAS), defined in RFC 4707, for centralized management of NNTP news server configurations. Usenet has significantly declined.

TCP/UDP Other

Security Considerations

Port 991 (NAS) 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 — Other

43 WHOIS 63 Whois++ 104 DICOM 105 CCSO Nameserver 170 Network PostScript 200 IMPLink 201 AppleTalk 213 IPX
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