Directory services ports
Overview
Directory services hold identity data. Require LDAPS or StartTLS, limit binds to service accounts, and keep the directory off the public internet.
Ports in this category14
Range coveredAll registry ranges
All Directory services 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 |
|---|---|---|---|---|
| 191 | PROSPERO | TCP / UDP | Standard/Low | Prospero Directory Service |
| 389 | LDAP | TCP / UDP | Medium | Lightweight Directory Access Protocol |
| 636 | LDAPS | TCP / UDP | Standard/Low | ldap protocol over TLS/SSL (was sldap) |
| 1525 | PROSPERO-NP | TCP / UDP | Standard/Low | Prospero Directory Service non-priv |
| 1918 | CAN-NDS | TCP / UDP | Standard/Low | IBM Tivole Directory Service - NDS |
| 1919 | CAN-DCH | TCP / UDP | Standard/Low | IBM Tivoli Directory Service - DCH |
| 1920 | CAN-FERRET | TCP / UDP | Standard/Low | IBM Tivoli Directory Service - FERRET |
| 3269 | MSFT-GC-SSL | TCP / UDP | Standard/Low | Microsoft Global Catalog with LDAP/SSL |
| 3437 | AUTOCUEDS | TCP / UDP | Standard/Low | Autocue Directory Service |
| 3660 | CAN-NDS-SSL | TCP / UDP | Standard/Low | IBM Tivoli Directory Service using SSL |
| 3661 | CAN-FERRET-SSL | TCP / UDP | Standard/Low | IBM Tivoli Directory Service using SSL |
| 6301 | BMC-CTD-LDAP | TCP / UDP | Standard/Low | BMC CONTROL-D LDAP SERVER IANA assigned this well-formed service name as a replacement for "bmc_ctd_ldap". |
| 9389 | ADWS | TCP | Standard/Low | Active Directory Web Services |
| 21846 | NETSPEAK-IS | TCP / UDP | Standard/Low | NetSpeak Corp. Directory Services |
Other categories
Authentication and access 19Caching and in-memory stores 10Containers and orchestration 10DNS and naming 10Databases 54Development servers 13Email 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