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Port 1056 (vfo)

IANA assigns port 1056 to vfo: VFO.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
vfo TCP VFO Anthony Gonzalez -
vfo UDP VFO Anthony Gonzalez -

Check what is listening on port 1056

Linux: is anything listening on TCP 1056?
sudo ss -tlnp 'sport = :1056'
Linux: UDP 1056
sudo ss -ulnp 'sport = :1056'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1056
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1056 '
Windows (Command Prompt)
netstat -ano | findstr :1056
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1056 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1056
From Windows
Test-NetConnection HOST -Port 1056
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1056

Block port 1056 in the firewall

ufw
sudo ufw deny 1056/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1056 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1056 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1056' -Direction Inbound -Protocol TCP -LocalPort 1056 -Action Block
ufw
sudo ufw deny 1056/udp
iptables
sudo iptables -A INPUT -p udp --dport 1056 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1056 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1056' -Direction Inbound -Protocol UDP -LocalPort 1056 -Action Block

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