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Port 4599 (a17-an-an)

IANA assigns port 4599 to a17-an-an: A17 (AN-AN).

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
a17-an-an TCP A17 (AN-AN) David Ott -
a17-an-an UDP A17 (AN-AN) David Ott -

Registry dates for this port: registered 2006-02.

Check what is listening on port 4599

Linux: is anything listening on TCP 4599?
sudo ss -tlnp 'sport = :4599'
Linux: UDP 4599
sudo ss -ulnp 'sport = :4599'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4599
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4599 '
Windows (Command Prompt)
netstat -ano | findstr :4599
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4599 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4599
From Windows
Test-NetConnection HOST -Port 4599
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4599

Block port 4599 in the firewall

ufw
sudo ufw deny 4599/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4599 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4599 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4599' -Direction Inbound -Protocol TCP -LocalPort 4599 -Action Block
ufw
sudo ufw deny 4599/udp
iptables
sudo iptables -A INPUT -p udp --dport 4599 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4599 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4599' -Direction Inbound -Protocol UDP -LocalPort 4599 -Action Block

Related ports

4597a21-an-1xbs4598a16-an-an4600piranha14601piranha2

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