Port 27876 (astrolink)

IANA assigns port 27876 to astrolink: Astrolink Protocol.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

astrolink TCP Astrolink Protocol Alanax Technologies Inc -

Registry dates for this port: registered 2013-01-14.

Linux: is anything listening on TCP 27876?

sudo ss -tlnp 'sport = :27876'

Linux / macOS: which process owns the port

sudo lsof -nP -i :27876

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':27876 '

Windows (Command Prompt)

netstat -ano | findstr :27876

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 27876 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 27876

From Windows

Test-NetConnection HOST -Port 27876

ufw

sudo ufw deny 27876/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 27876 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 27876 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 27876' -Direction Inbound -Protocol TCP -LocalPort 27876 -Action Block

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