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Port 5777 (starfield-io)

IANA assigns port 5777 to starfield-io: Control commands and responses.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
starfield-io TCP Control commands and responses Wayne Morrow -
starfield-io UDP Control commands and responses Wayne Morrow -

Registry dates for this port: registered 2003-10, last modified 2021-02-18.

Check what is listening on port 5777

Linux: is anything listening on TCP 5777?
sudo ss -tlnp 'sport = :5777'
Linux: UDP 5777
sudo ss -ulnp 'sport = :5777'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5777
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5777 '
Windows (Command Prompt)
netstat -ano | findstr :5777
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5777 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5777
From Windows
Test-NetConnection HOST -Port 5777
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5777

Block port 5777 in the firewall

ufw
sudo ufw deny 5777/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5777 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5777 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5777' -Direction Inbound -Protocol TCP -LocalPort 5777 -Action Block
ufw
sudo ufw deny 5777/udp
iptables
sudo iptables -A INPUT -p udp --dport 5777 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5777 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5777' -Direction Inbound -Protocol UDP -LocalPort 5777 -Action Block

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