Port 3747LXPRO.COM LinkTest SSL

Port 3747 is assigned to LXPRO.COM LinkTest SSL; public details about the service and its deployments are not established.

inNetwork Services

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

Technical Details

what runs on :3747

LXPRO.COM LinkTest SSL is registered on port :3747 over tcp and udp to Greg Bailey, assigned April 2003. 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 :3747

this machine

# linux
sudo ss -tulpn 'sport = :3747'

# macos / bsd
sudo lsof -nP -i :3747

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :3747

another host

nmap -sV -p T:3747 <host>
sudo nmap -sU -sV -p U:3747 <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 :3747

risk score

1/ 10safe

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

network services averages 2.7 across 1,442 ports — this one sits 1.7 below.

in transit

encrypted

payloads are protected on the wire

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 :3747 yet

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

Record

iana registry entry

port: :3747
service: LXPRO.COM LinkTest SSL
transport: TCPUDP
encryption: tls / encrypted
assignment: iana registered
risk: 1/10safe
category: Network Services
usage: IANA assigns TCP and UDP port 3747 to LXPRO.COM LinkTest SSL, registered by Greg Bailey. No established information identifies what software listens there or where engineers commonly encounter it.
lookups: 0rank 993
added: 2026-10-01
updated: 2026-10-01
references: IANA service name registry — port 3747

Something wrong?

This record is maintained by the engineers who use port 3747. 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 2026-10-01.

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

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:3128	Tatsoft Default HTTP Proxy	TCP	Web Services	caution	46.8k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :3747LXPRO.COM LinkTest SSL

Technical Details

Security Information

Related Ports

Port 3747LXPRO.COM LinkTest SSL