Port 6481 (servicetags)

IANA assigns port 6481 to servicetags: Service Tags.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

servicetags TCP Service Tags Peter Schow -

servicetags UDP Service Tags Peter Schow -

Registry dates for this port: registered 2007-01.

Linux: is anything listening on TCP 6481?

sudo ss -tlnp 'sport = :6481'

Linux: UDP 6481

sudo ss -ulnp 'sport = :6481'

Linux / macOS: which process owns the port

sudo lsof -nP -i :6481

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':6481 '

Windows (Command Prompt)

netstat -ano | findstr :6481

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6481 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 6481

From Windows

Test-NetConnection HOST -Port 6481

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

nc -vzu -w 5 HOST 6481

ufw

sudo ufw deny 6481/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 6481 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 6481 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 6481' -Direction Inbound -Protocol TCP -LocalPort 6481 -Action Block

ufw

sudo ufw deny 6481/udp

iptables

sudo iptables -A INPUT -p udp --dport 6481 -j DROP

nftables

sudo nft add rule inet filter input udp dport 6481 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 6481' -Direction Inbound -Protocol UDP -LocalPort 6481 -Action Block

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