Port 3513 sits in the registered port range and carries a name most people will never recognize: arcpd, the Adaptec Remote Protocol Daemon. IANA recorded the assignment in May 2002. 1
What It Was
In the early 2000s, Adaptec made RAID controllers — the hardware that takes a pile of hard drives and turns them into something reliable. Managing these controllers meant either standing in front of the server or running a locally installed GUI. Neither was great.
Adaptec's answer was Storage Manager Browser Edition: a lightweight web interface that ran directly on the server and answered on port 3513. A sysadmin anywhere on the network could open a browser, type:
...and get a full management interface for the RAID array. Disk health, rebuild status, failure alerts — all through a browser, years before "remote management" was the default assumption. 2
The daemon behind this was ARCPD — the Adaptec Remote Protocol Daemon. It ran as a background service on Windows, Unix, and Linux, started automatically, and waited for connections on port 3513. The web browser was the front end; ARCPD was the thing that actually talked to the controller hardware.
Why It Matters Less Now
Adaptec was eventually acquired by Microsemi, then Microchip Technology. The Browser Edition was superseded by maxView Storage Manager, which uses different infrastructure. The old ARCPD service faded from new deployments, though it persists on servers running vintage Adaptec hardware that nobody wants to touch.
Port 3513 remains registered. IANA doesn't reclaim ports. Somewhere, on some rack in some basement, ARCPD is probably still listening.
What Range This Port Belongs To
Port 3513 is a registered port (range: 1024–49151). These ports require registration with IANA but don't carry the universal recognition of well-known ports below 1024. Any application can technically use them — registration is a courtesy claim, not enforcement. If your firewall sees traffic on 3513, it's either an old Adaptec system or something that chose this number for its own reasons. 3
Checking What's Listening
If you want to know whether something is running on port 3513 on your machine:
Linux/macOS:
Windows:
If ARCPD appears, you're looking at legacy Adaptec storage management software. If something else appears, it has nothing to do with Adaptec — it just picked a number.
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