Port 4123Z-Wave Protocol

Port 4123 is assigned to Z-Wave Protocol and may be used by Z/IP gateways to carry Z-Wave traffic over IP.

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

also known as Z/IP, Z-Wave over IP

Technical Details

what runs on :4123

This assignment is for the Z-Wave Protocol, not the ordinary radio link between Z-Wave devices. A Z/IP gateway can carry Z-Wave traffic between an IP client and the radio network; implementations may use UDP, while IANA lists both TCP and UDP for this service. There is no universal behavior to expect from every listener on the port, so identify the gateway and its implementation before interpreting traffic. Z-Wave's own radio security features do not mean the IP transport is encrypted by default.

Security Information

exposure of :4123

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 2.6 across 1,494 ports — this one sits 0.6 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

A reachable gateway may expose a path to control devices on a home-automation network, so it should generally be kept behind a firewall and restricted to trusted clients. The port is not commonly seen open in internet-wide scans; do not assume that a listener is a Z-Wave gateway without confirming the service.

Record

iana registry entry

port: :4123
service: Z-Wave Protocol
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services IoT
usage: Z-Wave devices normally communicate over a local sub-GHz radio mesh, not by listening on an IP port. Port 4123 is associated with Z/IP gateways that bridge IP clients to a Z-Wave network; such gateways are uncommon on the public internet.
lookups: 0rank 993
added: 2026-10-03
updated: 2026-10-03
references: IANA service name registry — port 4123

Something wrong?

This record is maintained by the engineers who use port 4123. 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 2026-10-03.

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edit this record →back to the registry

Related Ports

all 1,494 in network services →

the 8 most looked-up other ports in network services — 1,494 ports carry that label.

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: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 :4123Z-Wave Protocol

Technical Details

Security Information

Related Ports

Port 4123Z-Wave Protocol