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Port 3305 (odette-ftp)

IANA assigns port 3305 to odette-ftp: ODETTE-FTP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
odette-ftp TCP ODETTE-FTP David Nash RFC 5024
odette-ftp UDP ODETTE-FTP David Nash RFC 5024

Check what is listening on port 3305

Linux: is anything listening on TCP 3305?
sudo ss -tlnp 'sport = :3305'
Linux: UDP 3305
sudo ss -ulnp 'sport = :3305'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3305
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3305 '
Windows (Command Prompt)
netstat -ano | findstr :3305
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3305 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3305
From Windows
Test-NetConnection HOST -Port 3305
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3305

Block port 3305 in the firewall

ufw
sudo ufw deny 3305/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3305 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3305 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3305' -Direction Inbound -Protocol TCP -LocalPort 3305 -Action Block
ufw
sudo ufw deny 3305/udp
iptables
sudo iptables -A INPUT -p udp --dport 3305 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3305 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3305' -Direction Inbound -Protocol UDP -LocalPort 3305 -Action Block

Related ports

3303opsession-clnt3304opsession-srvr3306MySQL / MariaDB3307opsession-prxy

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