Port 7491telops-lmd

Port 7491 is assigned to telops-lmd, an obscure service with no known common deployment.

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

Technical Details

what runs on :7491

telops-lmd is registered on port :7491 over tcp and udp to David Spencer. 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 :7491

this machine

# linux
sudo ss -tulpn 'sport = :7491'

# macos / bsd
sudo lsof -nP -i :7491

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :7491

another host

nmap -sV -p T:7491 <host>
sudo nmap -sU -sV -p U:7491 <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 :7491

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 · udp

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

security overview

no security notes recorded for :7491 yet

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

Record

iana registry entry

port: :7491
service: telops-lmd
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: The IANA registry lists telops-lmd on TCP and UDP, registered to David Spencer. No reliable protocol details or common deployment are known, and it has not appeared open in Nmap's scan data.
lookups: 0rank 993
added: 2026-10-12
updated: 2026-10-12
references: IANA service name registry — port 7491

Something wrong?

This record is maintained by the engineers who use port 7491. 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 2026-10-12.

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 :7491, by lookups.

port	service	proto	category	risk	views
:7547	TR-069 CPE WAN Management	TCPUDP	Remote Access	caution	8.3k
:7500	Silhouette User	TCPUDP	—	safe	0
:7430	OpenView DM xmpv7 API pipe	TCPUDP	—	safe	0
:7443	Oracle Application Server HTTPS	TCPUDPtls	Web Services	risk	0
:7428	OpenView DM Log Agent Manager	TCPUDP	—	safe	0
:7429	OpenView DM rqt communication	TCPUDP	Network Services	safe	0
:7501	HP OpenView Bus Daemon	TCPUDP	Network Services	safe	0
:7427	OpenView DM Event Agent Manager	TCPUDP	System	safe	0

risk mix of the 8 listed

safe75%
caution13%
risk13%

1 of 8 encrypted

Port :7491telops-lmd

Technical Details

Security Information

Related Ports

Port 7491telops-lmd