Port 4901FileLocator Remote Search Agent

TCP/4901 is assigned to the FileLocator Remote Search Agent, registered to David Vest.

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

also known as flr_agent, flr-agent

Technical Details

what runs on :4901

FileLocator Remote Search Agent is registered on port :4901 over tcp to David Vest, assigned November 2008. We don't have a technical write-up for it beyond the IANA registry entry.

In nmap's internet-wide scan data this port is never observed open, so if it's open on your network it's more likely a custom or misconfigured service than the registered one.

find what's listening on :4901

this machine

# linux
sudo ss -tlpn 'sport = :4901'

# macos / bsd
sudo lsof -nP -i :4901

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :4901

another host

nmap -sV -p T:4901 <host>

run it? the handshake, the implementations you meet in the wild and the flags that matter come from the engineers who do.

add technical details

Security Information

exposure of :4901

risk score

1/ 10safe

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

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

no security notes recorded for :4901 yet

known exploits, hardening advice, what a compromise looks like — suggest an edit if you know its exposure.

Record

iana registry entry

port: :4901
service: FileLocator Remote Search Agent
transport: TCP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: The IANA entry assigns TCP/4901 to the FileLocator Remote Search Agent and lists David Vest as the registrant. The service has not been observed open in the cited nmap scan data, and its deployment and protocol details are not established here.
lookups: 0rank 993
added: 2026-10-06
updated: 2026-10-06
references: IANA service name registry — port 4901

Something wrong?

This record is maintained by the engineers who use port 4901. 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
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

browse categories →

ports registered around :4901, by lookups.

port	service	proto	category	risk	views
:4899	Radmin Remote Administration	TCPUDP	Security	safe	28.3k
:4840	OPC UA TCP	TCPUDP	Network Services	caution	26.6k
:4843	OPC UA over TLS/SSL	TCPUDPtls	Security	caution	24.6k
:4949	Munin	TCP	Network Services	caution	8.9k
:4847	Quadrion WebFresh	TCPUDP	Web Services	caution	7.2k
:4950	Cylon UC32 Control	TCPUDP	Network Services	caution	5.8k
:4894	LysKOM	TCPUDP	Voice and Chat	caution	4.1k
:4838	Varadero-1	TCPUDP	—	safe	0

risk mix of the 8 listed

safe25%
caution75%

1 of 8 encrypted

Port :4901FileLocator Remote Search Agent

Technical Details

Security Information

Related Ports

Port 4901FileLocator Remote Search Agent