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Port 317 (zannet)

IANA assigns port 317 to zannet: Zannet.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
zannet TCP Zannet Zan Oliphant -
zannet UDP Zannet Zan Oliphant -

Check what is listening on port 317

Linux: is anything listening on TCP 317?
sudo ss -tlnp 'sport = :317'
Linux: UDP 317
sudo ss -ulnp 'sport = :317'
Linux / macOS: which process owns the port
sudo lsof -nP -i :317
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':317 '
Windows (Command Prompt)
netstat -ano | findstr :317
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 317 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 317
From Windows
Test-NetConnection HOST -Port 317
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 317

Block port 317 in the firewall

ufw
sudo ufw deny 317/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 317 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 317 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 317' -Direction Inbound -Protocol TCP -LocalPort 317 -Action Block
ufw
sudo ufw deny 317/udp
iptables
sudo iptables -A INPUT -p udp --dport 317 -j DROP
nftables
sudo nft add rule inet filter input udp dport 317 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 317' -Direction Inbound -Protocol UDP -LocalPort 317 -Action Block

Related ports

315dpsi316decauth318pkix-timestamp319ptp-event

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