HTTPfy

Port 4600 (piranha1)

IANA assigns port 4600 to piranha1: Piranha1.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
piranha1 TCP Piranha1 - -
piranha1 UDP Piranha1 - -

Check what is listening on port 4600

Linux: is anything listening on TCP 4600?
sudo ss -tlnp 'sport = :4600'
Linux: UDP 4600
sudo ss -ulnp 'sport = :4600'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4600
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4600 '
Windows (Command Prompt)
netstat -ano | findstr :4600
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4600 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4600
From Windows
Test-NetConnection HOST -Port 4600
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4600

Block port 4600 in the firewall

ufw
sudo ufw deny 4600/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4600 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4600 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4600' -Direction Inbound -Protocol TCP -LocalPort 4600 -Action Block
ufw
sudo ufw deny 4600/udp
iptables
sudo iptables -A INPUT -p udp --dport 4600 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4600 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4600' -Direction Inbound -Protocol UDP -LocalPort 4600 -Action Block

Related ports

4598a16-an-an4599a17-an-an4601piranha24602mtsserver

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