The Range: Registered Ports (1024–49151)
Port 10019 lives in the registered port range — these are the 48,000 ports between the well-known services (0–1023) and the dynamic/ephemeral ports (49152–65535). The registered range exists for exactly this: services that aren't famous enough for the well-known range, but real enough to document. They can be assigned by IANA, but most never are. Most just drift through the Internet as orphan addresses, waiting for someone to use them.
Port 10019 is officially unassigned by IANA. But that doesn't mean it's empty.
What Actually Runs Here: Revo DVRNS
In practice, port 10019 carries Revo DVRNS—Digital Video Recorder Name Service. 1 This is a system for connecting to security DVRs remotely over the Internet. Here's what it does:
Instead of remembering an IP address that changes every time your ISP reassigns it, you register your DVR with a name. TomStore05. Then, from anywhere with Internet access, you connect using that name instead of fighting with IP addresses. The DVRNS service translates that human-readable name into whatever IP address your DVR currently has. 2
You see this running on systems like the Revo R16DVR4 and other Revo surveillance equipment. Small business security systems. Home camera setups. The quiet infrastructure that lets a store owner check if there's a customer at the door, or a parent verify their child got home safely.
Why It Matters That It's Unassigned
The existence of unassigned ports is not a failure. It's the Internet's way of saying: "We can't predict what you'll need. Take a port number. Use it for whatever matters to you."
Revo took port 10019. Nobody issued a decree from IANA. There's no RFC. It's just... decided, through implementation. That port carries security data because Revo decided it should. If you have a Revo DVR, that port is the doorway between you and your cameras.
Thousands of unassigned ports work this way. Some carry proprietary protocols that will never be published. Some carry internal corporate traffic. Some carry nothing at all—just sit there, dark, waiting for someone to need them. 3
Checking What's On This Port
If you want to know whether port 10019 is open on your network:
On macOS/Linux:
On Windows:
Or, to scan it from another machine:
If you see listening traffic and you don't own Revo equipment, something else has claimed that port. It's rare. Most applications leave unassigned ports alone—too much risk of collision with someone else's choice.
The Quiet Work of Unassigned Ports
Port 10019 is honest about what it is: not famous, not standardized, just quietly carrying video from security cameras to the people who own them. It's one of 48,000 registered ports that IANA never standardized, and it's a reminder that the Internet's flexibility comes from this kind of pragmatic orphaning. Services don't need permission. They need a port number and a reason.
Port 10019 has both.
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