Port 1782: hp-hcip — The Port with a Name Nobody Can Decode

Port 1782 sits in the registered port range (1024-49151). These ports are assigned by IANA to specific services upon request, though registration doesn't guarantee the service is still actively used or widely deployed.

IANA lists port 1782 for both TCP and UDP under the service name hp-hcip. What does HCIP stand for? That's the honest answer: nobody outside HP seems to know. A thread on Experts Exchange from network administrators trying to identify the service concluded with the observation that it's "a service used by port 1782" — which answers nothing. HP's own public documentation doesn't expand the acronym.¹

What Actually Runs Here

The most concrete information about port 1782 comes from HP Jetdirect documentation, which identifies it as the TCP port for Jetsend — a proprietary HP protocol that let you send documents and images across a network directly to an HP printer for automatic printing.²

Jetsend required HP's proprietary software and was available on newer HP Jetdirect print server devices. It was never an open standard and has been effectively deprecated as HP moved toward web-based and cloud printing protocols.

Whether "hp-hcip" is Jetsend itself, a management layer around Jetsend, or something else entirely is unclear. The IANA registration predates widespread documentation of the protocol.

Security Notes

Port 1782 appears in some security databases as having been associated with trojan activity in the past.³ This is common for ports in the registered range — malware authors frequently pick lightly-used registered ports precisely because they're less scrutinized than well-known ports below 1024. Seeing this port open doesn't mean something malicious is happening, but it's worth identifying what process owns it.

How to Check What's Listening

If port 1782 appears open on a system you're investigating:

Linux / macOS:

ss -tlnp | grep 1782
# or
lsof -i :1782

Windows:

netstat -aon | findstr 1782

The output will show you the process ID. On Linux/macOS, lsof gives you the process name directly. On Windows, take the PID to Task Manager or use:

tasklist | findstr <PID>

If you're not running HP Jetdirect hardware, there's no reason this port should be open.

Why Unassigned and Obscure Ports Matter

The registered port range contains over 48,000 ports. Many registrations are for products that shipped once, found no market, and disappeared — leaving behind a name in the IANA registry and nothing else.

These ghost registrations matter for two reasons. First, security tools and firewall rules often treat registered ports differently from ephemeral ports — a registered name implies legitimacy. Second, attackers know this. An obscure registration like hp-hcip is useful cover: traffic on this port looks official even when it isn't.

The existence of a port registration tells you someone once asked IANA for the number. It tells you very little about whether the protocol is alive, documented, or safe.