UDP 623
Synopsis
- UDP port 623 is used by DMTF’s ASF/RMCP and IPMI-over-LAN (RMCP/RMCP+) protocols for out-of-band management.
- Baseboard Management Controllers commonly listening here include Dell iDRAC, HPE iLO, Supermicro BMC/IPMI, Lenovo IMM/XClarity Controller, Cisco CIMC, IBM IMM2, and Oracle/Sun ILOM.
- Client utilities such as ipmitool and the FreeIPMI suite (ipmipower, ipmi-sensors, bmc-config) send IPMI commands over UDP 623 for power control, sensor reads, and chassis management.
- Intel AMT/Management Engine supports ASF/RMCP on UDP 623 for remote power and alerting, used by AMT-aware management consoles.
- OpenBMC-based platforms (common in modern OCP/enterprise servers) implement IPMI over UDP 623 for compatibility with standard tools.
- Enterprise management products (e.g., Dell OpenManage, HPE Systems Insight Manager, Lenovo XClarity Administrator) can interact with compatible BMCs using IPMI on UDP 623.
- Security note: UDP 623 exposure is frequently exploited via IPMI v2.0 issues (RAKP hash extraction and the “cipher 0” no-auth option) and default credentials, enabling remote compromise if left open to untrusted networks.
Observed activity
Last 30 days
Detailed chart