Port 9978 (xybrid-rt)

IANA assigns port 9978 to xybrid-rt: XYBRID RT Server.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

xybrid-rt TCP XYBRID RT Server Rx Networks Inc -

Registry dates for this port: registered 2013-01-24.

Linux: is anything listening on TCP 9978?

sudo ss -tlnp 'sport = :9978'

Linux / macOS: which process owns the port

sudo lsof -nP -i :9978

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':9978 '

Windows (Command Prompt)

netstat -ano | findstr :9978

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9978 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 9978

From Windows

Test-NetConnection HOST -Port 9978

ufw

sudo ufw deny 9978/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 9978 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 9978 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 9978' -Direction Inbound -Protocol TCP -LocalPort 9978 -Action Block

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