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// Network services

Port 386: ASA Message Router Object Def.

Port 386 is assigned by IANA to asa (ASA Message Router Object Def.).

386

How asa works

Network services
client:386asaresponse client:386asaresponse

The client sends a request to port 386 and the asa service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Well-known (0-1023)
Category
Network services
01 Security

Is port 386 dangerous?

We have no specific security note for port 386. Its risk depends on the program actually listening on it. General advice for network services services:

  • Answer only the networks that need the service (no open resolvers, relays or reflectors).
  • UDP services can be abused for DDoS amplification: rate-limit or block them at the edge.
  • Disable legacy test services that have no use in production.
02 Registry

IANA registry entries for port 386

ServicePortTransportDescriptionReferenceUpdated
asa 386 TCP, UDP ASA Message Router Object Def. - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 386, and is it reachable?

Linux

sudo ss -ltnup 'sport = :386'      # process listening on 386
sudo lsof -nP -i :386

macOS

sudo lsof -nP -i :386

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 386 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 386
netstat -ano | findstr :386

From another machine

nmap -p 386 -sV <host>
sudo nmap -sU -p 386 <host>
nc -zv <host> 386

Block it in the firewall

sudo ufw deny 386/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 386" -Direction Inbound -LocalPort 386 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 386 used for?

Port 386 is assigned by IANA to asa (ASA Message Router Object Def.).

Is port 386 TCP or UDP?

Port 386 is registered for TCP and UDP.

Is it safe to open port 386?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Answer only the networks that need the service (no open resolvers, relays or reflectors).

How do I check if port 386 is open?

On Linux run "ss -ltnup 'sport = :386'", on macOS "lsof -nP -i :386", and on Windows "netstat -ano | findstr :386" to see the local process. From another machine, "nmap -p 386 <host>" shows whether it is reachable.

05 Related
:53 DNS tcp · udp · moderate risk :135 MS RPC tcp · udp · high risk :123 NTP udp · tcp · moderate risk :67 DHCP server udp · tcp · moderate risk :111 rpcbind tcp · udp · high risk :9100 Raw printing (JetDirect) tcp · udp · high risk :631 IPP / CUPS tcp · udp · high risk :5353 mDNS udp · tcp · moderate risk

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