Port 4937ATSC Mobile/Handheld Service Signaling Channel

UDP port 4937 is assigned to service signaling for ATSC Mobile/Handheld digital television broadcasts.

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

also known as atsc-mh-ssc

Technical Details

what runs on :4937

The assignment is for UDP service signaling associated with ATSC-M/H, the ATSC digital television system designed to deliver services to mobile and handheld receivers. Such signaling is part of the broadcast service environment; this is not a general-purpose client/server protocol or a port normally expected to have a daemon on an internet host. The registry identifies the channel but does not specify packet framing, a handshake, or deployment defaults, so those details should not be inferred from the port number alone.

Security Information

exposure of :4937

risk score

1/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

media averages 2.1 across 125 ports — this one sits 1.1 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

This is a specialized broadcast signaling assignment, not a commonly exposed internet service, and internet-wide scan data has not observed it open. UDP itself does not provide encryption or peer authentication; if a deployment accepts signaling on a reachable network, restrict access to the intended broadcast or receiver environment. No port-specific vulnerability or internet-facing attack pattern is established here.

Record

iana registry entry

port: :4937
service: ATSC Mobile/Handheld Service Signaling Channel
transport: UDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: Media
usage: This port is assigned to the ATSC Mobile/Handheld (ATSC-M/H) service signaling channel. It belongs in specialized broadcast and receiver systems, not among ordinary internet-facing services; the IANA record names Jerry Whitaker as the registrant.
lookups: 0rank 993
added: 2026-10-06
updated: 2026-10-06
references: IANA service name registry — port 4937

Something wrong?

This record is maintained by the engineers who use port 4937. 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 2026-10-06.

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 125 in media →

the 8 most looked-up other ports in media — 125 ports carry that label.

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:6005	Camfrog Chat	TCP	Voice and Chat	caution	25.2k
:8880	Windows Media SOAP Connector	TCP	Streaming	caution	24.3k
:8081	HTTP Alternate Port	TCP	Web Services	caution	23.3k
:5001	Slingbox	TCP	Streaming	caution	22.4k
:19302	Google Talk Voice & Video	UDP	Network Services	caution	19.3k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :4937ATSC Mobile/Handheld Service Signaling Channel

Technical Details

Security Information

Related Ports

Port 4937ATSC Mobile/Handheld Service Signaling Channel