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Port 5646 (vfmobile)

IANA assigns port 5646 to vfmobile: Ventureforth Mobile.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
vfmobile TCP Ventureforth Mobile Ventureforth Inc -

Registry dates for this port: registered 2011-11-03.

Check what is listening on port 5646

Linux: is anything listening on TCP 5646?
sudo ss -tlnp 'sport = :5646'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5646
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5646 '
Windows (Command Prompt)
netstat -ano | findstr :5646
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5646 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5646
From Windows
Test-NetConnection HOST -Port 5646

Block port 5646 in the firewall

ufw
sudo ufw deny 5646/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5646 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5646 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5646' -Direction Inbound -Protocol TCP -LocalPort 5646 -Action Block

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