What Port 3086 Is
Port 3086 sits in the registered ports range (1024–49151). According to the IANA registry, it is assigned to JDL-DBKitchen on both TCP and UDP, registered to Hideo Wakabayashi.1
JDL is Japan Digital Laboratory, a Tokyo-based company that has made accounting and tax software for Japanese professional firms since the 1980s. Their products run in accounting offices across Japan — invoicing, payroll, financial records. DBKitchen appears to be a database component of that ecosystem, likely used for data management within their proprietary software stack.2
If you are not running JDL accounting software in a Japanese tax office, nothing should be using this port. If something is, that's worth investigating.
What the Registered Range Means
The registered ports (1024–49151) are assigned by IANA to specific services upon request. Unlike well-known ports (0–1023), they don't require privileged access to bind, and IANA assignment doesn't guarantee the service is widely deployed or even actively maintained.
Many registered port assignments represent niche enterprise software, legacy systems, or regional tools with little global footprint. Port 3086 is a clear example: technically claimed, practically invisible outside its intended context.
How to Check What's Listening on This Port
On Linux or macOS:
On Windows:
If you find something listening here and you're not running JDL software, check the process name and investigate further. Unrecognized listeners on registered-but-obscure ports are occasionally used by malware specifically because they attract less scrutiny.3
Why Unassigned-in-Practice Ports Matter
The registered port space is large enough that many assignments fade into obscurity. Software gets abandoned, companies pivot, protocols go dark — but the IANA entry stays. This creates a gap between the registry and reality.
Network scanners and firewalls that rely on port-to-service databases may misidentify or simply skip these ports. That ambiguity is useful to know. When a port has no well-known service and no active community around it, any traffic there deserves a second look.
Frequently Asked Questions
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