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Port 5242 (attune)

IANA assigns port 5242 to attune: ATTUne API.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
attune TCP ATTUne API Bellvedi Ltd -

Registry dates for this port: registered 2022-06-01.

Check what is listening on port 5242

Linux: is anything listening on TCP 5242?
sudo ss -tlnp 'sport = :5242'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5242
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5242 '
Windows (Command Prompt)
netstat -ano | findstr :5242
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5242 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5242
From Windows
Test-NetConnection HOST -Port 5242

Block port 5242 in the firewall

ufw
sudo ufw deny 5242/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5242 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5242 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5242' -Direction Inbound -Protocol TCP -LocalPort 5242 -Action Block

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