What Range This Port Belongs To
Port 1799 falls in the registered ports range: 1024 to 49151.
This range sits between the well-known ports (0-1023), which are reserved for foundational Internet services like HTTP, SSH, and DNS, and the dynamic/ephemeral ports (49152-65535), which operating systems hand out temporarily for outgoing connections.
Registered ports are meant to be claimed. A company or developer requests an assignment from IANA, demonstrates a legitimate service, and gets their number. The expectation is that port 1799 would eventually belong to something specific. It doesn't. IANA's registry shows it unassigned.1
Any Known Unofficial Uses
Community port databases sometimes associate port 1799 with "NETRISK" or with Cisco NetRanger, an intrusion detection system Cisco acquired in 1998 when it bought WheelGroup.2 NetRanger was an early enterprise IDS that placed sensors throughout a network to detect unauthorized activity in real time.
Whether NetRanger actually used port 1799 in production, or whether this association drifted into port databases without a solid source, is unclear. Cisco eventually evolved NetRanger into its IDS and then IPS product lines. The software is long discontinued. If it ever used this port, that use ended years ago.
Some sources note that a trojan or malware used port 1799 at some point in the past. This is not unusual: unassigned or obscure ports are occasionally chosen by malware authors precisely because they fly under the radar. There is no current indication of active threats associated with this port.
In practice, if you see traffic on port 1799 today, it is almost certainly an application that chose the port for its own reasons, not one following any standard.
How to Check What Is Listening
If port 1799 is open on a machine you manage, find out what put it there:
On Linux or macOS:
On Windows:
Then take the process ID from that output and look it up:
If you didn't intentionally open this port, find out what process owns it before assuming it's harmless.
Why Unassigned Ports Matter
The port numbering system works because of shared expectations. Port 443 means HTTPS everywhere, on every device, by agreement. That agreement breaks down in the registered range when ports go unclaimed.
Unassigned registered ports are not empty — they're undefined. Any software can use them, and often does. This is fine for internal applications where you control both ends of the connection. It becomes a problem when two applications independently choose the same unassigned port, or when a firewall rule needs to decide whether to allow traffic without knowing what the traffic actually is.
Port 1799's lack of an official assignment doesn't mean nothing uses it. It means whatever uses it isn't telling IANA about it.
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