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// Other services

Port 3864: asap-sctp/tls

Port 3864 is assigned by IANA to asap-sctp-tls (asap-sctp/tls), asap-tcp-tls (asap/tls tcp port).

3864

How asap-sctp-tls works

Other services
client:3864asap-sctp-tlsresponse client:3864asap-sctp-tlsresponse

The client sends a request to port 3864 and the asap-sctp-tls service answers.

Transport
SCTP · TCP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 3864 dangerous?

We have no specific security note for port 3864. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 3864

ServicePortTransportDescriptionReferenceUpdated
asap-sctp-tls 3864 SCTP asap-sctp/tls RFC 5352 -
asap-tcp-tls 3864 TCP asap/tls tcp port RFC 5352 -
-3864-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 3864, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3864'      # process listening on 3864
sudo lsof -nP -i :3864

macOS

sudo lsof -nP -i :3864

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3864 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3864
netstat -ano | findstr :3864

From another machine

nmap -p 3864 -sV <host>
nc -zv <host> 3864

Block it in the firewall

sudo ufw deny 3864/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3864" -Direction Inbound -LocalPort 3864 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3864 used for?

Port 3864 is assigned by IANA to asap-sctp-tls (asap-sctp/tls), asap-tcp-tls (asap/tls tcp port).

Is port 3864 TCP or UDP?

Port 3864 is registered for SCTP and TCP.

Is it safe to open port 3864?

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. Close the port if nothing on the host needs it.

How do I check if port 3864 is open?

On Linux run "ss -ltnup 'sport = :3864'", on macOS "lsof -nP -i :3864", and on Windows "netstat -ano | findstr :3864" to see the local process. From another machine, "nmap -p 3864 <host>" shows whether it is reachable.

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