Port 4369Erlang Port Mapper Daemon (EPMD)

EPMD maps Erlang and Elixir node names to their distribution ports for distributed BEAM-node communication.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 5/10
lookups: 0

also known as Erlang EPMD

Technical Details

what runs on :4369

EPMD uses TCP and UDP on port 4369. Erlang nodes contact it to register their node name and distribution port, or to query the port associated with another node; the nodes then connect directly over their distribution ports. EPMD is a discovery service rather than the data channel itself, and its traffic is not encrypted by default. The distribution ports are commonly dynamically assigned, although administrators can constrain them to a configured range.

Security Information

exposure of :4369

risk score

5/ 10caution

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

network services averages 3.0 across 977 ports — this one sits 2.0 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 · udp

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

security overview

EPMD is generally unauthenticated and can disclose registered node names and distribution ports to remote clients. Internet exposure makes Erlang infrastructure easier to enumerate and may expose reachable distribution endpoints; it should normally be restricted to trusted hosts or networks, with Erlang distribution authentication and TLS used where appropriate.

Record

iana registry entry

port: :4369
service: Erlang Port Mapper Daemon (EPMD)
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 5/10caution
category: Network Services System
usage: EPMD runs on Erlang/OTP hosts and listens on port 4369 so distributed Erlang, Elixir, and other BEAM nodes can discover one another. It maps registered node names to the dynamically assigned TCP ports used for the actual Erlang distribution connection.
lookups: 0rank 994
added: 2026-09-06
updated: 2026-09-06
references: IANA service name registry — port 4369

Something wrong?

This record is maintained by the engineers who use port 4369. 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 2026-09-06.

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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 :4369Erlang Port Mapper Daemon (EPMD)

Technical Details

Security Information

Related Ports

Port 4369Erlang Port Mapper Daemon (EPMD)