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Port 6346 (gnutella-svc)

IANA assigns port 6346 to gnutella-svc.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
gnutella-svc TCP gnutella-svc Serguei Osokine -
gnutella-svc UDP gnutella-svc Serguei Osokine -

Check what is listening on port 6346

Linux: is anything listening on TCP 6346?
sudo ss -tlnp 'sport = :6346'
Linux: UDP 6346
sudo ss -ulnp 'sport = :6346'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6346
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6346 '
Windows (Command Prompt)
netstat -ano | findstr :6346
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6346 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6346
From Windows
Test-NetConnection HOST -Port 6346
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6346

Block port 6346 in the firewall

ufw
sudo ufw deny 6346/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6346 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6346 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6346' -Direction Inbound -Protocol TCP -LocalPort 6346 -Action Block
ufw
sudo ufw deny 6346/udp
iptables
sudo iptables -A INPUT -p udp --dport 6346 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6346 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6346' -Direction Inbound -Protocol UDP -LocalPort 6346 -Action Block

Related ports

6343sflow6344streletz6347gnutella-rtr6350adap

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