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Port 5859 (wherehoo)

IANA assigns port 5859 to wherehoo: WHEREHOO.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
wherehoo TCP WHEREHOO Jim Youll -
wherehoo UDP WHEREHOO Jim Youll -

Check what is listening on port 5859

Linux: is anything listening on TCP 5859?
sudo ss -tlnp 'sport = :5859'
Linux: UDP 5859
sudo ss -ulnp 'sport = :5859'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5859
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5859 '
Windows (Command Prompt)
netstat -ano | findstr :5859
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5859 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5859
From Windows
Test-NetConnection HOST -Port 5859
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5859

Block port 5859 in the firewall

ufw
sudo ufw deny 5859/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5859 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5859 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5859' -Direction Inbound -Protocol TCP -LocalPort 5859 -Action Block
ufw
sudo ufw deny 5859/udp
iptables
sudo iptables -A INPUT -p udp --dport 5859 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5859 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5859' -Direction Inbound -Protocol UDP -LocalPort 5859 -Action Block

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