Status: Unassigned (well-known port range)
Historical use: Mac OS X RPC services (NetInfo)
Current use: None
What This Port Is
Port 927 sits in the well-known port range (0-1023)—the space reserved by IANA for system services and fundamental protocols. Ports in this range are supposed to be assigned to specific services that need universal recognition across the Internet.
Port 927 is currently unassigned. It has no official service registered with IANA.1
But it wasn't always empty.
The NetInfo Era
In early versions of Mac OS X (10.0 through 10.4), port 927 was used by NetInfo—Apple's RPC-based directory service that managed user accounts, groups, network configurations, and other administrative data.2
NetInfo came from NeXTSTEP, the operating system Steve Jobs built at NeXT Computer in the 1980s. When Apple acquired NeXT and built Mac OS X on top of NeXTSTEP's foundation, NetInfo came along for the ride.3 It was one of several RPC-based services that used ports in the 600-1023 range.4
NetInfo stored this information in a hierarchical distributed database. When your Mac needed to know "who is user ID 501?" or "what's the IP address of the printer?", it asked NetInfo.
The Replacement
In 2002, Apple introduced Open Directory in Mac OS X Server 10.2 Jaguar—a standards-based directory service that could talk to LDAP, Active Directory, and other modern authentication systems.5
NetInfo was progressively phased out. By the time Mac OS X 10.5 Leopard shipped in 2007, NetInfo was completely gone—removed from the operating system entirely.6 Open Directory had taken over everything NetInfo used to do.
Port 927 became a ghost. The service that once lived there no longer exists.
Why Unassigned Ports Matter
The well-known port range contains 1,024 possible port numbers (0-1023). Many of them—like port 927—sit empty. This isn't waste. It's intentional scarcity.
When IANA assigns a well-known port, they're making a permanent decision. That number becomes globally associated with a specific service. HTTP gets 80. HTTPS gets 443. SSH gets 22. These associations are baked into software, firewalls, documentation, and the collective memory of everyone who works with networks.
Unassigned ports represent future possibility. Maybe a new fundamental protocol will emerge that deserves a well-known port. Maybe an old protocol will need a second port for a secure variant. The empty spaces matter because they can't be reclaimed once assigned.
Port 927 is unusual—it had an informal use (NetInfo) that never became official, then disappeared when the service died. Most unassigned ports have never been used for anything at all.
How to Check What's Listening
If you want to see whether anything is actually listening on port 927 on your system:
On Linux or macOS:
or
On Windows:
Unless you're running a very old Mac or some custom service that happens to use this port, you'll probably see nothing. The port is silent.
What This Port Carries Today
Nothing, most likely.
NetInfo has been dead since 2007. Modern macOS versions don't use port 927 for anything. The port sits in the well-known range, unassigned, waiting for IANA to decide it's needed for something else—or to remain empty forever.
This is what happens to ports when the services that used them disappear. The number remains. The traffic stops. And eventually, almost everyone forgets the port ever mattered.
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