Port 5090Candidate Access Router (CAR)

SCTP port associated with Candidate Access Router discovery for mobility and handoff; not a commonly encountered public service.

inNetwork Services Mobile

transport: sctp
in transit: cleartext
assignment: official
risk: 1/10
lookups: 0

also known as car, Candidate AR, CARD

1 other service is registered on port 5090. compare all 2 →

Technical Details

what runs on :5090

IANA assigns SCTP port 5090 to “Candidate AR,” referring to Candidate Access Router discovery in the mobility context. SCTP establishes an association using its INIT and cookie handshake; the port assignment identifies the service, but does not by itself specify application-level framing or a universal deployment profile. CARD is intended to help identify candidate access routers for handoff, rather than provide a general-purpose network service. Do not assume that an arbitrary listener on 5090 is CARD solely from its port number.

Security Information

exposure of :5090

risk score

1/ 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 1,620 ports — this one sits 1.6 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

sctp

every listening transport is another surface to filter at the edge

security overview

This is an uncommon mobility-network service, not one that normally needs to be reachable from the public internet. If deployed, restrict it to the relevant access-network peers: discovery exchanges could expose network information, and an exposed listener may be probed or targeted for denial of service. SCTP does not provide confidentiality by default.

Record

iana registry entry

port: :5090
service: Candidate Access Router (CAR)
transport: SCTP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: Network Services Mobile
usage: The assignment is associated with Candidate Access Router discovery (CARD), a mobility mechanism for finding access routers that may support a handoff. The registry does not record a registrant, and this is not a service commonly seen listening on the public internet.
lookups: 0rank 993
added: 2026-10-07
updated: 2026-10-07
references: IANA service name registry — port 5090

Something wrong?

This record is maintained by the engineers who use port 5090. 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 2026-10-07.

01edit any field on a page of its own
02a model checks it for accuracy and spam
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edit this record →back to the registry

Related Ports

all 1,620 in network services →

the 8 most looked-up other ports in network services — 1,620 ports carry that label.

port	service	proto	category	risk	views
:9080	Groove RPC	TCPUDP	Web Services	caution	70.8k
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: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 :5090Candidate Access Router (CAR)

Technical Details

Security Information

Related Ports

Port 5090Candidate Access Router (CAR)