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Port 3413 (svnet)

IANA assigns port 3413 to svnet: SpecView Networking.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
svnet TCP SpecView Networking Richard Dickins -
svnet UDP SpecView Networking Richard Dickins -

Registry dates for this port: registered 2002-02.

Check what is listening on port 3413

Linux: is anything listening on TCP 3413?
sudo ss -tlnp 'sport = :3413'
Linux: UDP 3413
sudo ss -ulnp 'sport = :3413'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3413
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3413 '
Windows (Command Prompt)
netstat -ano | findstr :3413
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3413 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3413
From Windows
Test-NetConnection HOST -Port 3413
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3413

Block port 3413 in the firewall

ufw
sudo ufw deny 3413/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3413 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3413 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3413' -Direction Inbound -Protocol TCP -LocalPort 3413 -Action Block
ufw
sudo ufw deny 3413/udp
iptables
sudo iptables -A INPUT -p udp --dport 3413 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3413 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3413' -Direction Inbound -Protocol UDP -LocalPort 3413 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.