Port 9595 (pds)

IANA assigns port 9595 to pds: Ping Discovery Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

pds TCP Ping Discovery Service Alan Butt -

pds UDP Ping Discovery Service Alan Butt -

Linux: is anything listening on TCP 9595?

sudo ss -tlnp 'sport = :9595'

Linux: UDP 9595

sudo ss -ulnp 'sport = :9595'

Linux / macOS: which process owns the port

sudo lsof -nP -i :9595

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':9595 '

Windows (Command Prompt)

netstat -ano | findstr :9595

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9595 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 9595

From Windows

Test-NetConnection HOST -Port 9595

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

nc -vzu -w 5 HOST 9595

ufw

sudo ufw deny 9595/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 9595 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 9595 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 9595' -Direction Inbound -Protocol TCP -LocalPort 9595 -Action Block

ufw

sudo ufw deny 9595/udp

iptables

sudo iptables -A INPUT -p udp --dport 9595 -j DROP

nftables

sudo nft add rule inet filter input udp dport 9595 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 9595' -Direction Inbound -Protocol UDP -LocalPort 9595 -Action Block

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