Port 2213 belongs to the registered port range (1024–49151). IANA maintains this range for services that have applied for and received an official assignment. Port 2213 has not. No service has claimed it. It sits there, officially empty.
What "Registered Port" Means
The registered range sits between the well-known ports (0–1023, the territory of HTTP, SSH, DNS) and the ephemeral ports (49152–65535, used as temporary source ports for outgoing connections). IANA will assign a port in this range to any service that applies and meets the criteria — but nobody has applied for 2213.
That doesn't mean nothing uses it. It means nothing officially uses it. Applications can listen on any port they choose; official assignment just means you've staked a public claim and told the world what to expect there.
Known Unofficial Uses
Port 2213 has no widely documented legitimate software that uses it by default. It appears occasionally in older trojan and malware port reference tables — the kind of lists security researchers compiled in the late 1990s and early 2000s cataloging ports that various remote access tools and backdoors were observed using.1 Whether any specific malware reliably used 2213 as a primary port, or whether it appeared incidentally, is not well documented.
The presence on these lists doesn't make the port dangerous. Any port can be used by any software. What it means is: if you see unexpected traffic on port 2213, it's worth investigating rather than assuming it's benign.
How to Check What's Listening on This Port
If you want to know whether anything is using port 2213 on your system:
On Linux or macOS:
On Windows:
The output will show you the process ID. From there, you can identify what's actually running.
If you see something listening on 2213 and you didn't put it there, that's your cue to investigate the process name and its origin.
Why Unassigned Ports Exist
The port space has 65,535 slots. Only a few thousand have official assignments. The rest exist as open territory — available for internal applications, proprietary protocols, and anything else that needs a consistent port without going through the IANA registration process.
This is by design. Not every service needs a globally recognized port number. A database running on your internal network, a custom API, a game server — these can pick any unassigned port and run there without conflict, as long as nothing else on the same machine claimed it first.
The registered port range is a commons. Port 2213 is just an unclaimed plot within it.
Frequently Asked Questions
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