Port 2248: UMS — A Name Without a Story

What This Port Is

Port 2248 is registered with the Internet Assigned Numbers Authority (IANA) under the service name UMS, standing for "User Management Service," assigned to both TCP and UDP. The registrant is listed as Andrew Crockford.¹

That's where the official record ends. No RFC defines the protocol. No major software package advertises this port. No security advisories warn about it. The name exists in the IANA registry, but the protocol — if it was ever implemented — left no public trace.

What Range It Belongs To

Port 2248 falls in the registered port range: 1024–49151.

These ports sit between the well-known ports (0–1023), which are reserved for foundational Internet protocols like HTTP (80), HTTPS (443), and SSH (22), and the dynamic/ephemeral range (49152–65535), which operating systems use for temporary outbound connections.

Registered ports are supposed to be used by specific applications that have requested a number from IANA. The registration process is relatively lightweight — there's no requirement to publish an RFC or prove the software exists. As a result, the registered range contains thousands of ports like this one: assigned, named, and then never widely deployed.

Any Known Unofficial Uses

None documented. Port 2248 does not appear in common firewall rule databases, intrusion detection signatures, or network scanning reports with any frequency. It's not associated with known malware, gaming software, enterprise applications, or common utilities.

If you see traffic on port 2248, it's likely application-specific to your environment — a custom service, a development tool, or software that chose this port for internal reasons.

How to Check What's Listening on This Port

If port 2248 is active on a machine you control, these commands will tell you what's using it:

On Linux or macOS:

# Show the process listening on port 2248
ss -tlnp | grep 2248

# Or with lsof
lsof -i :2248

On Windows:

# Show all listening ports with associated processes
netstat -ano | findstr :2248

# Then match the PID to a process
tasklist | findstr <PID>

With nmap (from another machine):

nmap -sV -p 2248 <target-host>

The -sV flag attempts to identify what service is actually running, which is more useful than the IANA name for a port like this.

Why Ports Like This Exist

The IANA registry is not a living directory of active software — it's more like a reservation system. Someone can register a port number, and that registration persists even if the software is never released, never adopted, or quietly abandoned.

This creates a large middle zone in the registered range: ports that are officially "taken" but practically unused. They're not dangerous by default, but they're also not meaningful. If you encounter one in the wild, the IANA name tells you almost nothing about what's actually running.

The real answer is always the same: check the process.