HTTPfy

Port 424 (opc-job-track)

IANA assigns port 424 to opc-job-track: IBM Operations Planning and Control Track.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
opc-job-track TCP IBM Operations Planning and Control Track Conny Larsson -
opc-job-track UDP IBM Operations Planning and Control Track Conny Larsson -

Check what is listening on port 424

Linux: is anything listening on TCP 424?
sudo ss -tlnp 'sport = :424'
Linux: UDP 424
sudo ss -ulnp 'sport = :424'
Linux / macOS: which process owns the port
sudo lsof -nP -i :424
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':424 '
Windows (Command Prompt)
netstat -ano | findstr :424
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 424 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 424
From Windows
Test-NetConnection HOST -Port 424
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 424

Block port 424 in the firewall

ufw
sudo ufw deny 424/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 424 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 424 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 424' -Direction Inbound -Protocol TCP -LocalPort 424 -Action Block
ufw
sudo ufw deny 424/udp
iptables
sudo iptables -A INPUT -p udp --dport 424 -j DROP
nftables
sudo nft add rule inet filter input udp dport 424 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 424' -Direction Inbound -Protocol UDP -LocalPort 424 -Action Block

Related ports

422ariel3423opc-job-start425icad-el426smartsdp

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