Port 5053Reprise License Manager Discovery

UDP 5053 is used by Reprise License Manager clients to discover license servers on a local network.

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

also known as rlm-disc, RLM discovery

1 other service is registered on port 5053. compare all 2 →

Technical Details

what runs on :5053

This is RLM's UDP discovery service, not the license-data connection itself. Clients send discovery traffic over UDP and an available RLM server can respond; discovery is generally useful on a local network, where broadcast traffic can reach servers. Clients then contact the server's RLM TCP port, commonly 5053 by default, though deployments can configure ports differently. The registry assignment is specifically for UDP 5053.

Security Information

exposure of :5053

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 1,610 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

Internet-facing UDP discovery is generally unnecessary and can expose the presence of an RLM license server to probes; it is not a substitute for securing the license service itself. Restrict it to trusted networks and allow it only where local client discovery is needed. Discovery traffic is not encrypted by default.

Record

iana registry entry

port: :5053
service: Reprise License Manager Discovery
transport: UDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services System
usage: Reprise License Manager (RLM) uses UDP 5053 for license-server discovery, typically on the same local network as the client. The discovered server's actual license traffic uses RLM's TCP service, commonly TCP 5053 by default.
lookups: 0rank 993
added: 2026-10-06
updated: 2026-10-06
references: IANA service name registry — port 5053

Something wrong?

This record is maintained by the engineers who use port 5053. 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

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :5053Reprise License Manager Discovery

Technical Details

Security Information

Related Ports

Port 5053Reprise License Manager Discovery