Port 1770 sits in the registered port range and carries an official IANA name: bmc-net-svc. That's a BMC Software network service — BMC being the enterprise IT management company behind products like BMC Patrol, BMC Client Management, and a large catalog of infrastructure monitoring tools.
What exactly bmc-net-svc does on this port? The public record doesn't say. No RFC defines it. No open specification describes the protocol. The IANA registry lists the service name and stops there.1
This is more common than you'd expect. Companies register ports for internal services, the registration goes through, and the documentation lives entirely inside corporate walls. The Internet gets a name in a table. The actual protocol stays proprietary.
What Range This Port Belongs To
Port 1770 falls in the registered port range: 1024 to 49151.
These ports are managed by IANA. Organizations can formally register a port for a service, which means claiming the name and discouraging others from using it for something else. Registration doesn't require an open specification. It doesn't require a public RFC. It requires filling out a form and having a service worth naming.
Contrast this with the well-known ports (0-1023), which require stronger justification and tend to carry universally recognized protocols like HTTP (80), SSH (22), or DNS (53). Registered ports are a wider, quieter neighborhood.
What You're Likely to See
If you find traffic on port 1770 in your environment:
- BMC software deployment: If your organization runs BMC Client Management, BMC Patrol, or related enterprise tools, this could be legitimate internal service traffic.
- Generic scanning: The SANS Internet Storm Center logs scan activity against port 1770 — automated probes that sweep the registered port range looking for anything that responds.2 This doesn't mean the port is dangerous; scanners hit everything.
- Something unrelated to BMC: Developers sometimes pick ports without checking the registry. An internal tool or test service may have landed here by coincidence.
How to Check What's Listening
On Linux or macOS:
On Windows:
The process name or PID in the output will tell you more than the port number ever could.
Why This Matters
The registered port range exists to prevent chaos — to give services stable addresses and give administrators some chance of knowing what's talking to what. When a registered port has no public documentation, that function breaks down partially. You have a name. You have a corporate owner. You don't have a way to verify behavior.
For port 1770, the honest answer is: it belongs to BMC Software for a network service they haven't publicly documented. If you're seeing it in your traffic logs and you don't run BMC products, that's worth investigating. If you do run BMC products, check their documentation for which component uses it — BMC publishes port lists for their various products, though bmc-net-svc specifically doesn't appear prominently in their public docs.
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