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Port 5473 (apsolab-tags)

IANA assigns port 5473 to apsolab-tags: The Apsolab company's secure dynamic tag protocol.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
apsolab-tags TCP The Apsolab company's secure dynamic tag protocol Apsolab Inc -

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

Check what is listening on port 5473

Linux: is anything listening on TCP 5473?
sudo ss -tlnp 'sport = :5473'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5473
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5473 '
Windows (Command Prompt)
netstat -ano | findstr :5473
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5473 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5473
From Windows
Test-NetConnection HOST -Port 5473

Block port 5473 in the firewall

ufw
sudo ufw deny 5473/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5473 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5473 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5473' -Direction Inbound -Protocol TCP -LocalPort 5473 -Action Block

Related ports

5471apsolab-cols5472apsolab-tag5474apsolab-rpc5475apsolab-data

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