Port 2963: iph-policy-adm — A Ghost in the Registry

What This Port Is

Port 2963 sits in the registered port range (1024–49151), the middle tier of the port numbering system. Unlike the well-known ports below 1024 — where SSH lives at 22 and HTTPS at 443 — registered ports are claimed through IANA's application process by companies and developers who need a stable, documented home for their software.

IANA records port 2963 as iph-policy-adm on both TCP and UDP, registered by Shai Herzog of IPHighway, Inc.¹

What IPHighway Was

IPHighway was a Framingham, Massachusetts company that built policy-based networking software in the late 1990s. The idea: large networks shouldn't be configured device-by-device. Instead, administrators should define high-level policies ("this class of traffic gets priority," "these users can access these resources"), and the network should enforce them automatically.

Shai Herzog was also a contributor to RFC 2748, the COPS (Common Open Policy Service) Protocol — a real IETF standard for distributing policy decisions from a central server to network devices.² IPHighway was building products in this space when policy-based networking was a serious frontier problem.

Port 2963 was almost certainly the admin interface for IPHighway's policy server — the port where administrators would connect to manage the policies being pushed out to the network.

IPHighway is now closed. The company never became a household name, policy-based networking evolved differently than the 1990s imagined it would, and the product disappeared. The IANA registration did not.

The Ghost Problem

This port now exists in a strange state:

• Officially taken — IANA still lists it as iph-policy-adm
• Practically abandoned — no software actively uses it
• Not reclaimable without process — IANA doesn't automatically reclaim ports from defunct companies

In practice, nothing is listening on port 2963 on your system unless you put it there. If you find something listening on it, that's worth investigating.

How to Check What's Using This Port

macOS / Linux:

# Show what's listening on port 2963
sudo lsof -i :2963

# Or with netstat
sudo netstat -tlnp | grep 2963

# Or with ss (Linux)
sudo ss -tlnp sport = :2963

Windows:

# Show listening ports and their processes
netstat -ano | findstr :2963

# Then look up the PID
tasklist | findstr <PID>

If nothing is returned, nothing is listening. That's the expected result.

Why This Matters

The registered port range has over 48,000 slots. Many are claimed by software that no longer ships, companies that no longer exist, and protocols that never caught on. They're not available for reuse without formal process, so they sit — officially occupied, practically empty.

Port 2963 is one of thousands of these. Each one is a small record of someone's ambition: a problem they wanted to solve, a product they tried to build, a registration that outlasted everything else.