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Port 1863 (msnp)

IANA assigns port 1863 to msnp: MSNP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
msnp TCP MSNP William Lai -
msnp UDP MSNP William Lai -

Check what is listening on port 1863

Linux: is anything listening on TCP 1863?
sudo ss -tlnp 'sport = :1863'
Linux: UDP 1863
sudo ss -ulnp 'sport = :1863'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1863
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1863 '
Windows (Command Prompt)
netstat -ano | findstr :1863
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1863 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1863
From Windows
Test-NetConnection HOST -Port 1863
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1863

Block port 1863 in the firewall

ufw
sudo ufw deny 1863/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1863 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1863 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1863' -Direction Inbound -Protocol TCP -LocalPort 1863 -Action Block
ufw
sudo ufw deny 1863/udp
iptables
sudo iptables -A INPUT -p udp --dport 1863 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1863 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1863' -Direction Inbound -Protocol UDP -LocalPort 1863 -Action Block

Related ports

1861lecroy-vicp1862mysql-cm-agent1864paradym-31port1865entp

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.