Port 3639xAP Home Automation Protocol

xAP carries lightweight home-automation messages between devices and software, usually over UDP on port 3639.

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

also known as xap-ha, xAP

Technical Details

what runs on :3639

xAP messages are structured, human-readable text with a header and named message blocks. Implementations typically exchange UDP datagrams on port 3639, often using LAN broadcast and a hub to relay messages; endpoints also send periodic heartbeats. IANA lists both TCP and UDP, but UDP is the usual transport in xAP deployments.

Security Information

exposure of :3639

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 2.7 across 1,423 ports — this one sits 0.7 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

xAP traffic is not encrypted by default, and the protocol does not provide strong built-in authentication. A host with access to the local network may be able to observe or inject automation messages, so keep it on a trusted LAN and do not expose it directly to the internet.

Record

iana registry entry

port: :3639
service: xAP Home Automation Protocol
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services IoT
usage: This is the IANA port for xAP, the Extensible Automation Protocol used by home-automation devices and software. Engineers are most likely to encounter it as UDP traffic between xAP applications and a local hub; it is uncommon on the public internet.
lookups: 0rank 993
added: 2026-09-30
updated: 2026-09-30
references: IANA service name registry — port 3639

Something wrong?

This record is maintained by the engineers who use port 3639. 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 2026-09-30.

01edit any field on a page of its own
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edit this record →back to the registry

Related Ports

all 1,423 in network services →

the 8 most looked-up other ports in network services — 1,423 ports carry that label.

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:3233	WhiskerControl Protocol	TCPUDP	Network Services	caution	61.9k
:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:3128	Tatsoft Default HTTP Proxy	TCP	Web Services	caution	46.8k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :3639xAP Home Automation Protocol

Technical Details

Security Information

Related Ports

Port 3639xAP Home Automation Protocol