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Port 9596 (mercury-disc)

IANA assigns port 9596 to mercury-disc: Mercury Discovery.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
mercury-disc TCP Mercury Discovery Paul Mclachlan -
mercury-disc UDP Mercury Discovery Paul Mclachlan -

Registry dates for this port: registered 2005-11.

Check what is listening on port 9596

Linux: is anything listening on TCP 9596?
sudo ss -tlnp 'sport = :9596'
Linux: UDP 9596
sudo ss -ulnp 'sport = :9596'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9596
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9596 '
Windows (Command Prompt)
netstat -ano | findstr :9596
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9596 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9596
From Windows
Test-NetConnection HOST -Port 9596
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9596

Block port 9596 in the firewall

ufw
sudo ufw deny 9596/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9596 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9596 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9596' -Direction Inbound -Protocol TCP -LocalPort 9596 -Action Block
ufw
sudo ufw deny 9596/udp
iptables
sudo iptables -A INPUT -p udp --dport 9596 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9596 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9596' -Direction Inbound -Protocol UDP -LocalPort 9596 -Action Block

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