Port 745 is unassigned. It has no official service, no RFC, no protocol waiting on the other side of the door.
What "Unassigned" Means
Port 745 sits in the well-known port range (0-1023), which is managed by the Internet Assigned Numbers Authority (IANA). These ports are reserved for system-level services and can only be officially assigned through IANA's formal process.1
But not every port in this range has been assigned. Port 745 is one of the gaps—held in reserve, available for future assignment if a service needs it.
Why Unassigned Ports Matter
The unassigned ports serve several purposes:
Room for growth — New protocols emerge. Standards evolve. Having unassigned ports means there's space for future services without having to reclaim ports from existing ones.
Flexibility — Organizations sometimes use unassigned ports for internal services that don't need global standardization. No conflict, no collision with official assignments.
Breathing room — The Internet doesn't have to use every number. The gaps between assignments are a feature, not a waste.
Unofficial Uses
Some sources reference port 745 in connection with Mac OS X RPC-based services and NetInfo,2 but there's no official IANA assignment confirming this. NetInfo was a legacy directory services system used in older versions of Mac OS X, now deprecated in favor of Open Directory.
If port 745 was ever used for NetInfo services, it was unofficial—a temporary use of available space, not a registered assignment.
Checking What's Listening
Even though port 745 has no official assignment, something could still be listening on it on your system. To check:
On Linux or macOS:
On Windows:
If you see something listening on port 745, it's either:
- A custom application configured to use this port
- An internal service using available port space
- Potentially malicious software (rare, but possible)
The Quiet Spaces
Not every port carries the Internet. Some just wait, unassigned, holding space in the numbering system in case someone needs them.
Port 745 is one of those spaces. No SSH connections at 3am. No email from your grandmother. No DNS queries finding names in the noise. Just a number in the registry, available, patient.
And that availability is its purpose.
Frequently Asked Questions About Port 745
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