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Port 5963 (indy)

IANA assigns port 5963 to indy: Indy Application Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
indy TCP Indy Application Server Bjorn Lantz -
indy UDP Indy Application Server Bjorn Lantz -

Registry dates for this port: registered 2004-11.

Check what is listening on port 5963

Linux: is anything listening on TCP 5963?
sudo ss -tlnp 'sport = :5963'
Linux: UDP 5963
sudo ss -ulnp 'sport = :5963'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5963
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5963 '
Windows (Command Prompt)
netstat -ano | findstr :5963
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5963 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5963
From Windows
Test-NetConnection HOST -Port 5963
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5963

Block port 5963 in the firewall

ufw
sudo ufw deny 5963/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5963 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5963 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5963' -Direction Inbound -Protocol TCP -LocalPort 5963 -Action Block
ufw
sudo ufw deny 5963/udp
iptables
sudo iptables -A INPUT -p udp --dport 5963 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5963 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5963' -Direction Inbound -Protocol UDP -LocalPort 5963 -Action Block

Related ports

5913aoc-acars, ads-c5914ipsdtls5968mppolicy-v55969mppolicy-mgr

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