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Port 459 (ampr-rcmd)

IANA assigns port 459 to ampr-rcmd.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
ampr-rcmd TCP ampr-rcmd Rob Janssen -
ampr-rcmd UDP ampr-rcmd Rob Janssen -

Check what is listening on port 459

Linux: is anything listening on TCP 459?
sudo ss -tlnp 'sport = :459'
Linux: UDP 459
sudo ss -ulnp 'sport = :459'
Linux / macOS: which process owns the port
sudo lsof -nP -i :459
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':459 '
Windows (Command Prompt)
netstat -ano | findstr :459
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 459 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 459
From Windows
Test-NetConnection HOST -Port 459
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 459

Block port 459 in the firewall

ufw
sudo ufw deny 459/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 459 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 459 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 459' -Direction Inbound -Protocol TCP -LocalPort 459 -Action Block
ufw
sudo ufw deny 459/udp
iptables
sudo iptables -A INPUT -p udp --dport 459 -j DROP
nftables
sudo nft add rule inet filter input udp dport 459 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 459' -Direction Inbound -Protocol UDP -LocalPort 459 -Action Block

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