Port 661 is commonly used for the Secure Sockets Layer (SSL)-enabled version of Simple Network Management Protocol (SNMP) for remote management of network devices like routers, switches, and servers. It is also used for other security-related protocols like HTTPS (HTTP Secure) and SSH (Secure Shell).
Ports those registered with IANA are shown as official ports. The same port number may be unofficialy used by various services or applications. The official usage are listed separately below its usage may change from time to time.
Official
Port |
Protocol (TCP/UDP) |
Title |
Description |
Port Type |
Port 661 |
tcp |
hap |
HAP |
WELL KNOWN PORT |
Port 661 |
udp |
hap |
HAP |
WELL KNOWN PORT |
UnOfficial
Unofficialy or sometimes with conflict, the same port may be used by different applications.
Port | Protocol (TCP/UDP) | Description |