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Port 5605 (a4-sdunode)

IANA assigns port 5605 to a4-sdunode: A4-SDUNode.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
a4-sdunode TCP A4-SDUNode Mike Dolan -
a4-sdunode UDP A4-SDUNode Mike Dolan -

Check what is listening on port 5605

Linux: is anything listening on TCP 5605?
sudo ss -tlnp 'sport = :5605'
Linux: UDP 5605
sudo ss -ulnp 'sport = :5605'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5605
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5605 '
Windows (Command Prompt)
netstat -ano | findstr :5605
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5605 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5605
From Windows
Test-NetConnection HOST -Port 5605
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5605

Block port 5605 in the firewall

ufw
sudo ufw deny 5605/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5605 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5605 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5605' -Direction Inbound -Protocol TCP -LocalPort 5605 -Action Block
ufw
sudo ufw deny 5605/udp
iptables
sudo iptables -A INPUT -p udp --dport 5605 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5605 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5605' -Direction Inbound -Protocol UDP -LocalPort 5605 -Action Block

Related ports

5603a1-bs5604a3-sdunode5618efr5627ninaf

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