Port 15118V2G SECC Discovery Protocol

UDP port 15118 lets an electric vehicle discover a charging station’s communication controller for ISO 15118 charging.

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

also known as ISO 15118 SDP, V2G SDP

Technical Details

what runs on :15118

This is the UDP discovery step in ISO 15118, not the charging session’s stream transport. An EV sends a compact discovery request to the IPv6 link-local all-nodes multicast address (FF02::1) on UDP port 15118; the SECC replies by unicast with its available transport and security options and connection endpoint. The EV then connects to that endpoint, typically over TCP, and may establish TLS for the session. Discovery datagrams themselves are not encrypted.

Security Information

exposure of :15118

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 1,901 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

udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

Discovery is intended for the local link between a vehicle and charging equipment, not as an internet-facing service. Its unauthenticated UDP requests and replies can reveal a controller’s presence and may be spoofed or disrupted by an attacker with access to the local network; restrict it to the charging network and use the negotiated session security where available.

Record

iana registry entry

port: :15118
service: V2G SECC Discovery Protocol
transport: UDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services IoT
usage: An electric vehicle uses this protocol to discover the Supply Equipment Communication Controller (SECC) at an ISO 15118-capable charging station. The exchange is local to the charging network; the response tells the vehicle how to connect for the subsequent charging session.
lookups: 0rank 993
added: 2026-10-17
updated: 2026-10-17
references: IANA service name registry — port 15118

Something wrong?

This record is maintained by the engineers who use port 15118. 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 :15118V2G SECC Discovery Protocol

Technical Details

Security Information

Related Ports

Port 15118V2G SECC Discovery Protocol