HTTPfy

Port 3520 (galileolog)

IANA assigns port 3520 to galileolog: Netvion Galileo Log Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
galileolog TCP Netvion Galileo Log Port Ray Caruso -
galileolog UDP Netvion Galileo Log Port Ray Caruso -

Registry dates for this port: registered 2002-06.

Check what is listening on port 3520

Linux: is anything listening on TCP 3520?
sudo ss -tlnp 'sport = :3520'
Linux: UDP 3520
sudo ss -ulnp 'sport = :3520'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3520
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3520 '
Windows (Command Prompt)
netstat -ano | findstr :3520
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3520 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3520
From Windows
Test-NetConnection HOST -Port 3520
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3520

Block port 3520 in the firewall

ufw
sudo ufw deny 3520/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3520 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3520 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3520' -Direction Inbound -Protocol TCP -LocalPort 3520 -Action Block
ufw
sudo ufw deny 3520/udp
iptables
sudo iptables -A INPUT -p udp --dport 3520 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3520 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3520' -Direction Inbound -Protocol UDP -LocalPort 3520 -Action Block

Related ports

3518artifact-msg3519nvmsgd, galileo3521mc3ss3522nssocketport

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