Port 4194Security Protocol and Data Model (SPDM)

TCP port 4194 is assigned to SPDM, a protocol for authenticating devices, retrieving measurements, and establishing secured sessions.

inSecurity Network Services

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

also known as spdm

Technical Details

what runs on :4194

IANA assigns TCP port 4194 to SPDM. SPDM is a binary request/response protocol: peers negotiate versions and capabilities, and can authenticate an endpoint, retrieve measurements, and establish a secured session. Encryption is not automatic for every exchange; it is available after session key establishment. TCP provides the connection, while SPDM supplies the protocol messages. In typical hardware deployments SPDM is carried over device-oriented transports such as MCTP or PCIe DOE, so a TCP listener is more likely in a specialized integration or test setup than on an ordinary server.

Security Information

exposure of :4194

risk score

2/ 10safe

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

security averages 3.1 across 368 ports — this one sits 1.1 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

every listening transport is another surface to filter at the edge

security overview

This is not a remote shell or a general-purpose management interface, and a deployed responder may expose certificates or device measurements during protocol exchanges. SPDM can establish a secured session, but initial negotiation and authentication exchanges are not necessarily encrypted. Avoid exposing an SPDM responder to the public internet; restrict access to the intended management network and keep its implementation current, since reachable protocol parsers can still present implementation-level attack surface.

Record

iana registry entry

port: :4194
service: Security Protocol and Data Model (SPDM)
transport: TCP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Security Network Services
usage: A listener here is expected to be an SPDM responder, typically in a device-management, hardware integration, or test environment rather than a general-purpose internet service. SPDM is more commonly encountered over device-oriented transports such as MCTP or PCIe DOE than as a TCP listener.
lookups: 0rank 993
added: 2026-10-04
updated: 2026-10-04
references: IANA service name registry — port 4194

Something wrong?

This record is maintained by the engineers who use port 4194. 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 2026-10-04.

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 368 in security →

the 8 most looked-up other ports in security — 368 ports carry that label.

port	service	proto	category	risk	views
:8881	Atlasz Secure Server	TCP	Web Services	caution	67.6k
:443	HTTPS	TCPtls	Web Services	caution	65.9k
:8291	Winbox MikroTik Admin	TCP	Security	caution	62.9k
:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:3128	Squid Proxy HTTP	TCP	Web Services	caution	45.8k
:8080	HTTP Alternate	TCP	Web Services	caution	44.9k
:7000	Vuze HTTPS Tracker	TCPtls	Security	caution	28.9k

risk mix of the 8 listed

caution100%

2 of 8 encrypted

Port :4194Security Protocol and Data Model (SPDM)

Technical Details

Security Information

Related Ports

Port 4194Security Protocol and Data Model (SPDM)