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Port 4598 (a16-an-an)

IANA assigns port 4598 to a16-an-an: A16 (AN-AN).

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
a16-an-an TCP A16 (AN-AN) David Ott -
a16-an-an UDP A16 (AN-AN) David Ott -

Registry dates for this port: registered 2005-12.

Check what is listening on port 4598

Linux: is anything listening on TCP 4598?
sudo ss -tlnp 'sport = :4598'
Linux: UDP 4598
sudo ss -ulnp 'sport = :4598'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4598
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4598 '
Windows (Command Prompt)
netstat -ano | findstr :4598
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4598 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4598
From Windows
Test-NetConnection HOST -Port 4598
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4598

Block port 4598 in the firewall

ufw
sudo ufw deny 4598/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4598 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4598 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4598' -Direction Inbound -Protocol TCP -LocalPort 4598 -Action Block
ufw
sudo ufw deny 4598/udp
iptables
sudo iptables -A INPUT -p udp --dport 4598 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4598 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4598' -Direction Inbound -Protocol UDP -LocalPort 4598 -Action Block

Related ports

4596ias-neighbor4597a21-an-1xbs4599a17-an-an4600piranha1

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