Port 3658: PlayStation AMS (Secure) — Sony's Online Gaming Infrastructure

What This Port Is

Port 3658 is registered with IANA under the service name ps-ams, described as PlayStation AMS (Secure). It operates on both TCP and UDP, with UDP being the primary transport for real-time gaming traffic.

The "Secure" in the name distinguishes it from port 3657, which carries the non-secure variant of the same service. This secure/non-secure pairing was a common pattern in Sony's PlayStation networking stack.

Nobody has publicly documented what "AMS" expands to. The leading candidate, based on the port's observed behavior, is something like Audio/Media Server or Account Management Server — it handled voice chat and real-time communication during PS2 and PS3 online play. Sony registered it with IANA, it worked, and the acronym never made it into any public specification.

The Registered Port Range

Port 3658 falls in the registered ports range (1024–49151). These ports are:

• Assigned by IANA upon application from vendors and developers
• Not exclusively reserved — any application can technically use them
• Intended to prevent collisions between services

The registered range exists between the well-known ports (0–1023), which carry the Internet's foundational protocols, and the dynamic/ephemeral ports (49152–65535), which operating systems assign on the fly for outbound connections.

What It Was Used For

Sony's online gaming infrastructure for PS2 and PS3 used a cluster of ports together. Port 3658 appeared alongside 3478, 3479, and 3659 in PlayStation network documentation and port forwarding guides from that era. Together they handled:

• Voice chat during online multiplayer sessions
• Console authentication and presence
• Real-time game state communication

If you set up port forwarding on your router for a PS3 circa 2009, you almost certainly opened port 3658. The gaming forums of that era are full of it. ¹

Where It Stands Now

PlayStation Network has evolved significantly since the PS2 and early PS3 era. Sony's modern infrastructure uses a different set of ports and protocols. Port 3658 still appears in some PlayStation support documentation as a legacy requirement, but it's no longer central to how PlayStation online gaming works.

How to Check What's Using This Port

If port 3658 shows up on your system, here's how to see what's listening:

macOS / Linux:

lsof -i :3658
# or
ss -tulnp | grep 3658

Windows:

netstat -ano | findstr :3658

The process ID returned can be cross-referenced against Task Manager (Windows) or ps aux (macOS/Linux) to identify the responsible application.

On a typical modern machine with no PlayStation-related software running, port 3658 should show nothing. If something unexpected is listening, that's worth investigating.

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