What This Port Is
Port 3507 sits in the registered port range (1024-49151). IANA lists it as nesh-broker, registered in May 2020 by a private individual. Both TCP and UDP are assigned.1
That's the entirety of the public record.
The Registered Range
Ports 1024-49151 are registered ports. The theory is that applications and services claim a specific port so two programs don't accidentally collide in the same namespace. IANA maintains the list.
In practice, the registry is a mixed bag. Some registered ports are famous: 3306 is MySQL, 5432 is PostgreSQL, 6379 is Redis. Others are obscure commercial products. Some, like port 3507, appear to be private projects or internal tools that registered a port number as due diligence, then continued existing entirely outside of public view.
Registration is not a quality signal. It's a name in a directory.
If This Port Shows Up on Your System
Port 3507 is not associated with any known malware or exploit tools, but an unrecognized open port is always worth investigating.
To see what's listening:
macOS and Linux:
Windows:
The process name and PID will tell you more than the port number ever could.
Why Gaps Like This Exist
The registered port namespace has 48,127 slots. Hundreds of them are held by services that barely exist in public — internal enterprise tools, abandoned projects, personal experiments that were methodical enough to file a registration but never shipped widely enough to be documented anywhere else.
Port 3507 is one of these. It has a name. It has an assignee. It has a registration date. What it doesn't have is a protocol specification, open source implementation, or any evidence of real-world deployment that search engines can find.
The port is registered. The service is invisible.
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