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Port 24321 (ild)

IANA assigns port 24321 to ild: Isolv Local Directory.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ild TCP Isolv Local Directory Mitchell Bass -
ild UDP Isolv Local Directory Mitchell Bass -

Registry dates for this port: registered 2005-08.

Check what is listening on port 24321

Linux: is anything listening on TCP 24321?
sudo ss -tlnp 'sport = :24321'
Linux: UDP 24321
sudo ss -ulnp 'sport = :24321'
Linux / macOS: which process owns the port
sudo lsof -nP -i :24321
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':24321 '
Windows (Command Prompt)
netstat -ano | findstr :24321
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 24321 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 24321
From Windows
Test-NetConnection HOST -Port 24321
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 24321

Block port 24321 in the firewall

ufw
sudo ufw deny 24321/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 24321 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 24321 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 24321' -Direction Inbound -Protocol TCP -LocalPort 24321 -Action Block
ufw
sudo ufw deny 24321/udp
iptables
sudo iptables -A INPUT -p udp --dport 24321 -j DROP
nftables
sudo nft add rule inet filter input udp dport 24321 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 24321' -Direction Inbound -Protocol UDP -LocalPort 24321 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.