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// Other services

Port 3863: asap sctp

Port 3863 is assigned by IANA to asap-sctp (asap sctp), asap-tcp (asap tcp port), asap-udp (asap udp port).

3863

How asap-sctp works

Other services
client:3863asap-sctpresponse client:3863asap-sctpresponse

The client sends a request to port 3863 and the asap-sctp service answers.

Transport
SCTP · TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned3 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 3863 dangerous?

We have no specific security note for port 3863. 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 3863

ServicePortTransportDescriptionReferenceUpdated
asap-sctp 3863 SCTP asap sctp RFC 5352 -
asap-tcp 3863 TCP asap tcp port - -
asap-udp 3863 UDP asap udp port RFC 5352 -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3863, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3863'      # process listening on 3863
sudo lsof -nP -i :3863

macOS

sudo lsof -nP -i :3863

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3863 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3863
netstat -ano | findstr :3863

From another machine

nmap -p 3863 -sV <host>
sudo nmap -sU -p 3863 <host>
nc -zv <host> 3863

Block it in the firewall

sudo ufw deny 3863/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3863" -Direction Inbound -LocalPort 3863 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3863 used for?

Port 3863 is assigned by IANA to asap-sctp (asap sctp), asap-tcp (asap tcp port), asap-udp (asap udp port).

Is port 3863 TCP or UDP?

Port 3863 is registered for SCTP and TCP and UDP.

Is it safe to open port 3863?

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 3863 is open?

On Linux run "ss -ltnup 'sport = :3863'", on macOS "lsof -nP -i :3863", and on Windows "netstat -ano | findstr :3863" to see the local process. From another machine, "nmap -p 3863 <host>" shows whether it is reachable.

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