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Port 2504 (wlbs)

IANA assigns port 2504 to wlbs: WLBS.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
wlbs TCP WLBS William Bain -
wlbs UDP WLBS William Bain -

Check what is listening on port 2504

Linux: is anything listening on TCP 2504?
sudo ss -tlnp 'sport = :2504'
Linux: UDP 2504
sudo ss -ulnp 'sport = :2504'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2504
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2504 '
Windows (Command Prompt)
netstat -ano | findstr :2504
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2504 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2504
From Windows
Test-NetConnection HOST -Port 2504
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2504

Block port 2504 in the firewall

ufw
sudo ufw deny 2504/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2504 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2504 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2504' -Direction Inbound -Protocol TCP -LocalPort 2504 -Action Block
ufw
sudo ufw deny 2504/udp
iptables
sudo iptables -A INPUT -p udp --dport 2504 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2504 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2504' -Direction Inbound -Protocol UDP -LocalPort 2504 -Action Block

Related ports

2502kentrox-prot2503nms-dpnss2505ppcontrol2506jbroker

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