Authentication and access ports
Overview
Authentication infrastructure is a single point of trust. Restrict it to network devices and servers, protect shared secrets, and monitor failed attempts.
Ports in this category19
Range coveredAll registry ranges
All Authentication and access port numbers
Every port below is assigned to this category in the registry or by a widely used convention. Open a port for its check and block commands, risk rating and troubleshooting notes.
| Port | Service | Transport | Risk | Description |
|---|---|---|---|---|
| 31 | MSG-AUTH | TCP / UDP | Standard/Low | MSG Authentication |
| 49 | TACACS | TCP / UDP | Standard/Low | Login Host Protocol (TACACS) |
| 56 | XNS-AUTH | TCP / UDP | Standard/Low | XNS Authentication |
| 88 | KERBEROS | TCP / UDP | Standard/Low | Kerberos |
| 113 | AUTH | TCP / UDP | Standard/Low | Authentication Service |
| 300 | TACACSS | TCP | Standard/Low | TLS Secure Login Host Protocol (TACACSS) |
| 749 | KERBEROS-ADM | TCP / UDP | Standard/Low | kerberos administration |
| 750 | KERBEROS-IV | TCP / UDP | Standard/Low | kerberos version iv |
| 1812 | RADIUS | TCP / UDP | Standard/Low | RADIUS |
| 1813 | RADIUS-ACCT | TCP / UDP | Standard/Low | RADIUS Accounting |
| 2478 | SSM-CSSPS | TCP / UDP | Standard/Low | SecurSight Authentication Server (SSL) |
| 2821 | VRTS-AT-PORT | TCP / UDP | Standard/Low | VERITAS Authentication Service |
| 3207 | VX-AUTH-PORT | TCP / UDP | Standard/Low | Veritas Authentication Port |
| 3799 | RADIUS-DYNAUTH | TCP / UDP | Standard/Low | RADIUS Dynamic Authorization |
| 4129 | NUAUTH | TCP / UDP | Standard/Low | NuFW authentication protocol |
| 5635 | SFMSSO | TCP | Standard/Low | SFM Authentication Subsystem |
| 7004 | AFS3-KASERVER | TCP / UDP | Standard/Low | AFS/Kerberos authentication service |
| 7847 | CSOAUTH | TCP | Standard/Low | A product key authentication protocol made by CSO |
| 27999 | TW-AUTH-KEY | TCP / UDP | Standard/Low | TW Authentication/Key Distribution and |
Other categories
Caching and in-memory stores 10Containers and orchestration 10DNS and naming 10Databases 54Development servers 13Directory services 14Email 26File transfer and sharing 27Gaming 6Infrastructure and administration 30IoT and device telemetry 7Message queues and streaming 17Monitoring and metrics 29Networking and proxies 31Printing 19RPC and service APIs 14Remote access 29Time synchronization 10VPN and tunnelling 10Voice and real-time media 29Web and HTTP 62Windows networking 14
Primary data: IANA Service Name and Transport Protocol Port Number Registry, plus clearly marked community conventions.
Last reviewed 2026-10-30 · Methodology · About · Privacy