What Runs on This Port
Port 682 is officially assigned by IANA to Hyperwave-ISP, a protocol used by the Hyperwave Information Server—a web-based document and knowledge management system.1 The port is designated for both TCP and UDP protocols.
You will almost certainly never see traffic on this port. Hyperwave-ISP is a protocol from another timeline, one where the web evolved differently.
The Technology That Wasn't
In the mid-1990s, as the web was still finding its shape, Hyperwave emerged from the Hyper-G project—an alternative vision for how hypertext systems should work. Where the web used HTML and HTTP, Hyperwave had its own formats and protocols. It was designed for corporate intranets, for document management at scale, for structured knowledge systems that went beyond simple linked pages.2
In 1997, Hyperwave AG released the Hyperwave Information Server commercially. It won awards—BYTE Magazine's Best of Show at CeBIT, the European IT-Prize worth 200,000 euros. Technical analyses called it "superior" to standard web technologies.3
But superior doesn't mean chosen. By 2000, the race was over. Apache and standard web servers had won. Organizations that might have used Hyperwave found they could achieve similar results by combining Apache with third-party modules. The ecosystem had spoken.
What the Port Means
Port 682 sits in the well-known ports range (0-1023)—the block reserved for services so fundamental, so widely deployed, that they deserve permanent, universal recognition. Email. DNS. Web traffic. And Hyperwave-ISP.
The irony is quiet but real. Hyperwave earned its place in the well-known range, but the traffic never came. The company still exists, now serving niche markets with evolved products.4 But the protocol that owns port 682 carries almost nothing across the Internet.
This is what happens when you arrive at the wrong moment. The port remains, officially assigned, waiting for connections that history decided not to make.
Security Considerations
Port 682 should be closed on public-facing systems unless you are specifically running Hyperwave Information Server—which you almost certainly aren't. While the protocol itself poses no unique security risks, open ports invite scanning, probing, and attempts to exploit whatever might be listening.
If you find port 682 open and don't recognize why, investigate immediately.
Checking What's Listening
To see if anything is listening on port 682 on your system:
Linux/Mac:
Windows:
If you see a service on this port and you didn't install Hyperwave, you should identify what's running and why.
Why Unassigned Traffic Matters
Most ports in the well-known range carry the infrastructure of the modern Internet. Port 682 is different—it's a reminder that assignment doesn't guarantee adoption. IANA can reserve a number, a company can build a protocol, the technology can be genuinely good—and the world can still choose something else.
The well-known ports aren't a list of what won. They're a list of what was expected to matter.
Related Ports
- Port 418 (Hyper-G) — Another port assigned to Hyperwave's predecessor technology
- Port 692 (Hyperwave-ISP) — A secondary port for the same service
- Port 80 (HTTP) — The standard web protocol that became ubiquitous while Hyperwave didn't
Frequently Asked Questions About Port 682
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