Port 5474 (apsolab-rpc)

IANA assigns port 5474 to apsolab-rpc: The Apsolab company's status query protocol.

Registered (user) port, 1024-49151 UDP

Port 5474 is normally used over UDP; the checker tests TCP only, so a "filtered" result does not mean the UDP service is down.

IANA assignment

Service nameProtoDescriptionAssigneeReference

apsolab-rpc UDP The Apsolab company's status query protocol Apsolab Inc -

Registry dates for this port: registered 2014-11-10.

Linux: UDP 5474

sudo ss -ulnp 'sport = :5474'

Linux / macOS: which process owns the port

sudo lsof -nP -i :5474

Windows (Command Prompt)

netstat -ano | findstr :5474

Windows (PowerShell)

Get-NetUDPEndpoint -LocalPort 5474

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 5474

ufw

sudo ufw deny 5474/udp

iptables

sudo iptables -A INPUT -p udp --dport 5474 -j DROP

nftables

sudo nft add rule inet filter input udp dport 5474 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 5474' -Direction Inbound -Protocol UDP -LocalPort 5474 -Action Block

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