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Port 3598 (a15)

IANA assigns port 3598 to a15: A15 (AN-to-AN).

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
a15 TCP A15 (AN-to-AN) David Ott -
a15 UDP A15 (AN-to-AN) David Ott -

Registry dates for this port: registered 2002-09.

Check what is listening on port 3598

Linux: is anything listening on TCP 3598?
sudo ss -tlnp 'sport = :3598'
Linux: UDP 3598
sudo ss -ulnp 'sport = :3598'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3598
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3598 '
Windows (Command Prompt)
netstat -ano | findstr :3598
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3598 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3598
From Windows
Test-NetConnection HOST -Port 3598
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3598

Block port 3598 in the firewall

ufw
sudo ufw deny 3598/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3598 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3598 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3598' -Direction Inbound -Protocol TCP -LocalPort 3598 -Action Block
ufw
sudo ufw deny 3598/udp
iptables
sudo iptables -A INPUT -p udp --dport 3598 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3598 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3598' -Direction Inbound -Protocol UDP -LocalPort 3598 -Action Block

Related ports

3596iw-mmogame3597a143599quasar-server3600trap-daemon

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