Port 13400Diagnostics over Internet Protocol (DoIP)

DoIP carries automotive diagnostic traffic between diagnostic testers and vehicle ECUs over Ethernet.

transport: tcp
in transit: cleartext
assignment: official
risk: 8/10
lookups: 0

also known as doip-data, DoIP, ISO 13400

1 other service is registered on port 13400. compare all 2 →

Technical Details

what runs on :13400

DoIP is the automotive diagnostic protocol standardized in ISO 13400. A tester opens a TCP connection to port 13400, then typically performs routing activation before exchanging diagnostic messages with a vehicle gateway or ECU. Messages use an 8-byte DoIP header containing protocol-version fields, a payload type, and a payload length. UDP 13400 is commonly used for vehicle discovery and announcements. DoIP traffic on TCP 13400 is not encrypted by default; TLS-protected DoIP is available in deployments using the secure service, commonly on TCP 3496.

Security Information

exposure of :13400

risk score

8/ 10risk

treat as sensitive. widely scanned and regularly exploited when reachable — restrict it to known sources.

network services averages 2.6 across 1,895 ports — this one sits 5.4 above.

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

DoIP can expose diagnostic functions such as reading vehicle data, running tests, and—in suitably authorized sessions—programming ECUs. Access controls and the vehicle gateway’s configuration determine which operations are possible, so an open port alone does not imply unrestricted vehicle control. Do not expose it to the public internet; restrict access to trusted diagnostic networks and use TLS and appropriate authorization where supported.

Record

iana registry entry

port: :13400
service: Diagnostics over Internet Protocol (DoIP)
transport: TCP
encryption: cleartext
assignment: iana registered
risk: 8/10risk
category: Network Services IoT
usage: Automotive diagnostic testers use DoIP to communicate with a vehicle’s Ethernet-connected gateway and ECUs, for tasks such as reading fault codes and performing service operations. TCP port 13400 is the standard DoIP data port; vehicle discovery commonly uses UDP 13400.
lookups: 0rank 993
added: 2026-10-17
updated: 2026-10-17
references: IANA service name registry — port 13400

Something wrong?

This record is maintained by the engineers who use port 13400. 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 2026-10-17.

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

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :13400Diagnostics over Internet Protocol (DoIP)

Technical Details

Security Information

Related Ports

Port 13400Diagnostics over Internet Protocol (DoIP)