What Runs on Port 3413
Port 3413 is officially assigned to svnet — SpecView Networking — and registered with IANA in 2002.1
SpecView is SCADA (Supervisory Control and Data Acquisition) software made by Watlow, built for engineers who need to monitor and control industrial thermal processes: ovens, heaters, power controllers, temperature regulators.2 It's the kind of software running in plastics factories, food processing plants, and laboratory environments — anywhere precise thermal control matters.
The protocol is simple in purpose: SpecView Remote connects over TCP port 3413 to SpecView Local, which is the instance running on-site next to the actual equipment.3 The remote operator sees live readings, can adjust setpoints, and receives alarms — the same view they'd have standing in front of the machine.
Both TCP and UDP are registered for this port, though TCP is the default for remote connections.
What Range This Port Belongs To
Port 3413 sits in the registered port range (1024–49151). These ports are not reserved for the operating system, but they are tracked by IANA. Any application or vendor can request registration, which Watlow (then SpecView Corporation) did in 2002.
Registered doesn't mean exclusive — nothing technically prevents another application from using 3413. But registration signals: this is our port, we told the world, run something else elsewhere.
Security Note
SCADA systems connected directly to the Internet are a known attack surface. Port 3413 open to the public Internet is a red flag on any network that isn't deliberately running SpecView Remote. If you see unexpected traffic on this port, it warrants investigation.
Modern deployments typically protect SpecView Remote connections behind VPNs rather than exposing port 3413 directly.
Check What's Listening
On Linux or macOS:
On Windows:
Remotely (check if port is open):
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