Port 3855OpenTRAC

OpenTRAC is an amateur-radio tracking and telemetry protocol used to convey position and related data.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 1/10
lookups: 0

also known as Open Tracking Protocol

Technical Details

what runs on :3855

OpenTRAC carries tracking information such as position and telemetry, primarily in amateur-radio contexts. The IANA assignment lists both TCP and UDP, but does not specify a universal IP handshake, framing, or default port behavior; implementations and any adaptation to IP determine those details. OpenTRAC is not a common general-purpose internet service, and the port should not be assumed to identify an active listener.

Security Information

exposure of :3855

risk score

1/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

network services averages 2.7 across 1,460 ports — this one sits 1.7 below.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

OpenTRAC traffic is not encrypted by default, so position and telemetry may be observable if transmitted over an unprotected network. Because public-facing listeners are uncommon, allow access only from intended peers and avoid exposing a listener unless the deployment requires it; treat location data as potentially sensitive.

Record

iana registry entry

port: :3855
service: OpenTRAC
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: Network Services
usage: OpenTRAC is an amateur-radio tracking protocol associated with GPS position and telemetry reporting, including use with compatible tracking equipment. The IANA TCP/UDP assignment is uncommon on the public internet; its existence does not imply that a host is running a widely deployed OpenTRAC server.
lookups: 0rank 993
added: 2026-10-02
updated: 2026-10-02
references: IANA service name registry — port 3855

Something wrong?

This record is maintained by the engineers who use port 3855. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-10-02.

01edit any field on a page of its own
02a model checks it for accuracy and spam
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edit this record →back to the registry

Related Ports

all 1,460 in network services →

the 8 most looked-up other ports in network services — 1,460 ports carry that label.

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :3855OpenTRAC

Technical Details

Security Information

Related Ports

Port 3855OpenTRAC