CyberHunter
Local dataset, no network
// Other services

Port 1863: MSNP

Port 1863 is assigned by IANA to msnp (MSNP).

1863

How msnp works

Other services
client:1863msnpresponse client:1863msnpresponse

The client sends a request to port 1863 and the msnp 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
Registered (1024-49151)
Category
Other services
01 Security

Is port 1863 dangerous?

We have no specific security note for port 1863. 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 1863

ServicePortTransportDescriptionReferenceUpdated
msnp 1863 TCP, UDP MSNP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1863, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1863'      # process listening on 1863
sudo lsof -nP -i :1863

macOS

sudo lsof -nP -i :1863

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1863 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1863
netstat -ano | findstr :1863

From another machine

nmap -p 1863 -sV <host>
sudo nmap -sU -p 1863 <host>
nc -zv <host> 1863

Block it in the firewall

sudo ufw deny 1863/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1863" -Direction Inbound -LocalPort 1863 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1863 used for?

Port 1863 is assigned by IANA to msnp (MSNP).

Is port 1863 TCP or UDP?

Port 1863 is registered for TCP and UDP.

Is it safe to open port 1863?

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 1863 is open?

On Linux run "ss -ltnup 'sport = :1863'", on macOS "lsof -nP -i :1863", and on Windows "netstat -ano | findstr :1863" to see the local process. From another machine, "nmap -p 1863 <host>" shows whether it is reachable.

05 Related
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