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Port 9104 (peerwire)

IANA assigns port 9104 to peerwire: PeerWire.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
peerwire TCP PeerWire Steven Gerhardt -
peerwire UDP PeerWire Steven Gerhardt -

Registry dates for this port: registered 2004-02.

Check what is listening on port 9104

Linux: is anything listening on TCP 9104?
sudo ss -tlnp 'sport = :9104'
Linux: UDP 9104
sudo ss -ulnp 'sport = :9104'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9104
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9104 '
Windows (Command Prompt)
netstat -ano | findstr :9104
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9104 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9104
From Windows
Test-NetConnection HOST -Port 9104
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9104

Block port 9104 in the firewall

ufw
sudo ufw deny 9104/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9104 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9104 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9104' -Direction Inbound -Protocol TCP -LocalPort 9104 -Action Block
ufw
sudo ufw deny 9104/udp
iptables
sudo iptables -A INPUT -p udp --dport 9104 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9104 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9104' -Direction Inbound -Protocol UDP -LocalPort 9104 -Action Block

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