Port 5066STANAG 5066 Subnet Interface

STANAG 5066 Subnet Interface for exchanging data between HF radio applications and a STANAG 5066 modem.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 2/10
lookups: 0

also known as STANAG-5066-SUBNET-INTF, S5066

Technical Details

what runs on :5066

STANAG 5066 SIS is an application-to-modem interface for HF data communications. Implementations use TCP and, where supported, UDP on port 5066 to exchange framed data and control or status information; TCP provides a session-oriented connection, while UDP support and message handling depend on the implementation. Session negotiation, framing details, and operational defaults are defined by the STANAG 5066 profile and device software rather than by a general Internet service convention.

Security Information

exposure of :5066

risk score

2/ 10safe

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

network services averages 2.8 across 1,157 ports — this one sits 0.8 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

This is normally a private radio-network interface, not an Internet-facing service. Exposure can allow unauthorized clients to probe or use an HF gateway and may disclose radio-network or operational information; restrict access to trusted management or application hosts and do not assume the interface is encrypted by default. No broadly known Internet-wide vulnerability is implied by the port assignment.

Record

iana registry entry

port: :5066
service: STANAG 5066 Subnet Interface
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services
usage: This port carries the STANAG 5066 Subnet Interface (SIS), connecting applications or network services to an HF radio modem or gateway. It is mainly encountered in specialized military, maritime, and commercial HF communications systems; the registry assignment is held by Rickard Berg.
lookups: 0rank 994
added: 2026-09-14
updated: 2026-09-14
references: IANA service name registry — port 5066

Something wrong?

This record is maintained by the engineers who use port 5066. 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 2026-09-14.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

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all 1,157 in network services →

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :5066STANAG 5066 Subnet Interface

Technical Details

Security Information

Related Ports

Port 5066STANAG 5066 Subnet Interface