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Port 658 (tenfold)

IANA assigns port 658 to tenfold: TenFold.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
tenfold TCP TenFold Louis Olszyk -
tenfold UDP TenFold Louis Olszyk -

Check what is listening on port 658

Linux: is anything listening on TCP 658?
sudo ss -tlnp 'sport = :658'
Linux: UDP 658
sudo ss -ulnp 'sport = :658'
Linux / macOS: which process owns the port
sudo lsof -nP -i :658
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':658 '
Windows (Command Prompt)
netstat -ano | findstr :658
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 658 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 658
From Windows
Test-NetConnection HOST -Port 658
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 658

Block port 658 in the firewall

ufw
sudo ufw deny 658/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 658 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 658 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 658' -Direction Inbound -Protocol TCP -LocalPort 658 -Action Block
ufw
sudo ufw deny 658/udp
iptables
sudo iptables -A INPUT -p udp --dport 658 -j DROP
nftables
sudo nft add rule inet filter input udp dport 658 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 658' -Direction Inbound -Protocol UDP -LocalPort 658 -Action Block

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