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Port 5557 (farenet)

IANA assigns port 5557 to farenet: Sandlab FARENET.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
farenet TCP Sandlab FARENET Kay T Labinsky -

Registry dates for this port: registered 2010-05-03.

Check what is listening on port 5557

Linux: is anything listening on TCP 5557?
sudo ss -tlnp 'sport = :5557'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5557
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5557 '
Windows (Command Prompt)
netstat -ano | findstr :5557
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5557 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5557
From Windows
Test-NetConnection HOST -Port 5557

Block port 5557 in the firewall

ufw
sudo ufw deny 5557/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5557 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5557 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5557' -Direction Inbound -Protocol TCP -LocalPort 5557 -Action Block

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