Port 3693Emergency Automatic Structure Lockdown System

TCP 3693 is assigned to Mele Associates’ Emergency Automatic Structure Lockdown System; public protocol details are unavailable.

inSecurity

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

also known as easl

Technical Details

what runs on :3693

Emergency Automatic Structure Lockdown System is registered on port :3693 over tcp to Mele Associates, assigned November 2014. 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 :3693

this machine

# linux
sudo ss -tlpn 'sport = :3693'

# macos / bsd
sudo lsof -nP -i :3693

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :3693

another host

nmap -sV -p T:3693 <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 :3693

risk score

1/ 10safe

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

security averages 3.1 across 360 ports — this one sits 2.1 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

tcp

every listening transport is another surface to filter at the edge

security overview

no security notes recorded for :3693 yet

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

Record

iana registry entry

port: :3693
service: Emergency Automatic Structure Lockdown System
transport: TCP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: Security
usage: IANA assigns TCP port 3693 to the Emergency Automatic Structure Lockdown System, registered to Mele Associates. There is no established public information about implementations or where engineers would encounter it.
lookups: 0rank 993
added: 2026-10-01
updated: 2026-10-01
references: IANA service name registry — port 3693

Something wrong?

This record is maintained by the engineers who use port 3693. 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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all 360 in security →

the 8 most looked-up other ports in security — 360 ports carry that label.

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risk mix of the 8 listed

caution100%

2 of 8 encrypted

Port :3693Emergency Automatic Structure Lockdown System

Technical Details

Security Information

Related Ports

Port 3693Emergency Automatic Structure Lockdown System