Port 3821ATSC Programming Metadata Communication Protocol

ATSC PMCP carries program and schedule metadata between broadcast automation and television systems.

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

also known as pmcp, ATSC PMCP

Technical Details

what runs on :3821

The IANA assignment is for ATSC PMCP on TCP and UDP port 3821. PMCP exchanges structured programming metadata, including XML-based content, between broadcast equipment; it is not a general-purpose interactive service. Port assignment alone does not establish which transport a particular implementation uses or imply TLS, and implementation-specific connection and framing details should be checked against the equipment documentation.

Security Information

exposure of :3821

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 2.7 across 1,454 ports — this one sits 0.7 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 · udp

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

security overview

This service is intended for controlled broadcast-system networks, not direct internet exposure. If reachable, an attacker may be able to interact with systems handling program metadata; restrict access to trusted equipment and network segments, and do not assume traffic is encrypted.

Record

iana registry entry

port: :3821
service: ATSC Programming Metadata Communication Protocol
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services Media
usage: PMCP is an ATSC-standard protocol for exchanging programming metadata among broadcast systems, such as automation and PSIP equipment. It is mainly encountered on broadcast operations networks, not as a typical public internet service.
lookups: 0rank 993
added: 2026-10-02
updated: 2026-10-02
references: IANA service name registry — port 3821

Something wrong?

This record is maintained by the engineers who use port 3821. 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 2026-10-02.

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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 :3821ATSC Programming Metadata Communication Protocol

Technical Details

Security Information

Related Ports

Port 3821ATSC Programming Metadata Communication Protocol