Port 8883Secure MQTT

MQTT messaging protected with TLS, commonly used by IoT devices and brokers on TCP port 8883.

transport: tcp · udp
in transit: encrypted
assignment: official
risk: 4/10
lookups: 0

also known as MQTT over TLS, MQTT TLS

Technical Details

what runs on :8883

A client first performs a TLS handshake with the broker, then exchanges normal MQTT control packets inside the encrypted connection. MQTT 3.1.1 and MQTT 5 commonly use this service, with port 8883 as the conventional default; port 1883 is generally used for unencrypted MQTT. The IANA assignment includes UDP, but conventional MQTT/TLS deployments use TCP.

Security Information

exposure of :8883

risk score

4/ 10caution

worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.

network services averages 2.8 across 1,175 ports — this one sits 1.2 above.

in transit

encrypted

payloads are protected on the wire

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

TLS protects credentials and message contents in transit, but the broker still requires strong authentication, authorization, certificate validation, and topic-level access controls. Internet exposure should be intentional because attackers can probe for weak credentials, misconfigured anonymous access, excessive topic permissions, or consume broker resources; TLS alone does not prevent application-layer abuse.

Record

iana registry entry

port: :8883
service: Secure MQTT
transport: TCPUDP
encryption: tls / encrypted
assignment: iana registered
risk: 4/10caution
category: Network Services IoT
usage: This port normally carries MQTT client-to-broker messaging protected by TLS, especially in IoT and telemetry deployments. Engineers typically encounter it as the encrypted counterpart to plaintext MQTT on port 1883; the registry lists both TCP and UDP, although standard MQTT over TLS is usually TCP.
lookups: 0rank 994
added: 2026-09-14
updated: 2026-09-14
references: IANA service name registry — port 8883

Something wrong?

This record is maintained by the engineers who use port 8883. 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

Related Ports

all 1,175 in network services →

the 8 most looked-up other ports in network services — 1,175 ports carry that label.

port	service	proto	category	risk	views
:9080	Groove RPC	TCPUDP	Web Services	caution	70.8k
:6543	Jetnet	UDP	Network Services	caution	65.3k
:5938	TeamViewer	TCPUDP	Remote Access	caution	65.0k
:8291	Winbox MikroTik Admin	TCP	Security	caution	62.9k
: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 :8883Secure MQTT

Technical Details

Security Information

Related Ports

Port 8883Secure MQTT