What Port 2633 Is
Port 2633 sits in the registered port range — the stretch of ports from 1024 to 49151 that IANA manages on behalf of applications and services that have formally staked a claim.
The IANA registry lists port 2633 as assigned to a service called InterIntelli, registered to someone named Mike Gagle. It's listed for both TCP and UDP.1
Beyond the registry entry, there is essentially no trail. No RFC. No public documentation. No company or product named InterIntelli with any visible presence. The registration exists; the registrant has vanished.
What This Means in Practice
In the registered port range, IANA tries to coordinate assignments so two different services aren't fighting over the same number. When a company or developer registered InterIntelli, the intent was presumably to give their software a stable home — a port number that was officially theirs.
But registrations don't expire, and companies do. The result is a port that's technically spoken for but practically abandoned. No software you're likely to encounter uses 2633 for InterIntelli. If you see traffic on this port, it's something else entirely.
If You See Traffic on Port 2633
Unassigned-in-practice ports like this sometimes get picked up by:
- Custom internal applications that needed a port and grabbed one that seemed free
- Gaming software or peer-to-peer tools that use high-registered ports informally
- Malware that avoids well-known ports specifically because they're less scrutinized
If port 2633 shows up open on a system you manage and you didn't put it there, find out what's listening before assuming it's benign.
How to Check What's Using It
On Linux or macOS:
On Windows:
The process ID in the output will tell you exactly what software opened the port.
Why Ghost Registrations Exist
The registered port space has tens of thousands of entries. Some were claimed by products that shipped, thrived, and are still in use. Others were claimed by products that shipped and died. Others by products that were never built at all.
IANA doesn't aggressively reclaim abandoned registrations, which means the registry slowly accumulates fossils — port numbers that exist on paper, do nothing in practice, and create mild confusion for anyone trying to understand why a port "isn't free" but also isn't doing anything.
Port 2633 is one of those. Documented. Registered. Empty.
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