Port 5053RLM License Server

RLM License Server uses TCP port 5053 for software license management.

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

also known as rlm

Technical Details

what runs on :5053

RLM listens on TCP 5053 by default and exchanges license-management requests with RLM-aware clients. The connection is a proprietary request/response protocol rather than HTTP, and deployments may also expose vendor-specific ISV license-server ports defined in the license file. Port 5054 is commonly used for the RLM web administration interface. RLM traffic is not encrypted with TLS by default.

Security Information

exposure of :5053

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 2.6 across 1,537 ports — this one sits 2.4 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

every listening transport is another surface to filter at the edge

security overview

This port should normally be reachable only by authorized client networks or through a VPN, not exposed to the public internet. An exposed server can disclose licensing information and allow unauthorized license checkouts or consume the available license pool, causing denial of service to legitimate users; restrict access with firewall rules and use vendor-supported security controls or tunneling where required.

Record

iana registry entry

port: :5053
service: RLM License Server
transport: TCP
encryption: cleartext
assignment: iana registered
risk: 5/10caution
category: Network Services
usage: This is the default TCP listener for Reprise Software's RLM (Reprise License Manager) license server. Engineering and commercial applications contact it to check out, return, and verify floating licenses; the separate RLM web administration interface commonly uses port 5054.
lookups: 0rank 993
added: 2026-09-14
updated: 2026-09-22
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 2026-09-22.

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 :5053RLM License Server

Technical Details

Security Information

Related Ports

Port 5053RLM License Server