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Port 5245 (downtools, downtools-disc)

IANA assigns port 5245 to downtools, downtools-disc: DownTools Control Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
downtools TCP DownTools Control Protocol Jarrod Sayers -
downtools-disc UDP DownTools Discovery Protocol Jarrod Sayers -

Registry dates for this port: registered 2009-04-07.

Check what is listening on port 5245

Linux: is anything listening on TCP 5245?
sudo ss -tlnp 'sport = :5245'
Linux: UDP 5245
sudo ss -ulnp 'sport = :5245'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5245
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5245 '
Windows (Command Prompt)
netstat -ano | findstr :5245
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5245 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5245
From Windows
Test-NetConnection HOST -Port 5245
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5245

Block port 5245 in the firewall

ufw
sudo ufw deny 5245/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5245 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5245 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5245' -Direction Inbound -Protocol TCP -LocalPort 5245 -Action Block
ufw
sudo ufw deny 5245/udp
iptables
sudo iptables -A INPUT -p udp --dport 5245 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5245 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5245' -Direction Inbound -Protocol UDP -LocalPort 5245 -Action Block

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