Port 2662 is assigned to BinTec-CAPI, the Remote CAPI (Common ISDN API) server built into BinTec networking routers.1 It runs on both TCP and UDP.
Before broadband existed everywhere, ISDN (Integrated Services Digital Network) was how businesses got fast, reliable digital connections. BinTec, a German networking company, made routers that connected offices to the ISDN network. Port 2662 is where those routers listened for Remote CAPI connections.
What Remote CAPI Does
CAPI — the Common ISDN API — is a standard that lets software talk to ISDN hardware.2 Originally, each computer needed its own ISDN adapter card. Remote CAPI changed that: instead of putting an ISDN card in every PC, a single BinTec router could act as a shared CAPI server. Any computer on the network could connect to port 2662 and use the router's ISDN channels as if the hardware were local.
One router. One ISDN line. Every computer on the floor gets access. That was the idea.
This mattered for fax software, voice applications, and dial-up Internet — all the things that needed ISDN in the 1990s and early 2000s. Tobit David, a popular German business communication suite, specifically documented how to configure BinTec's Remote CAPI for its ISDN integration.3
Why It's Quiet Now
ISDN is largely obsolete. Broadband — DSL, cable, fiber — replaced it. The applications that needed CAPI moved on or disappeared. Port 2662 still sits in the IANA registry as an official assignment, but on most modern networks, nothing is listening there.
IANA notes "Unauthorized Use Known" for this port, which is a standard warning that appears for ports that have at some point attracted unwanted traffic. It doesn't indicate an active threat — just that, like any open doorway, someone tried it.
The Registered Port Range
Port 2662 sits in the registered ports range (1024–49151). These ports are assigned by IANA to specific services, but unlike the well-known ports below 1024, they don't require root/administrator privileges to open. Any process can bind to port 2662 — the assignment is a convention, not a lock.
Neighbors in this range include BinTec-TAPI on port 2663 (BinTec's telephony API companion), which suggests BinTec registered a small block of ports for their product suite.1
What's Actually Listening on Port 2662
If you're seeing traffic on port 2662 and you don't have a BinTec router, something else is using it — either a legitimate application that chose it informally, or something worth investigating.
To check what's listening:
On Linux/macOS:
On Windows:
The process ID in the output will tell you exactly what's holding the port.
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