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Port 2905 (m3ua, De-registered)

IANA assigns port 2905 to m3ua, De-registered: M3UA.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
m3ua TCP M3UA Lyndon Ong RFC 4666
- UDP De-registered - -
m3ua SCTP M3UA Lyndon Ong RFC 4666

Registry dates for this port: registered 2001-06-07.

Check what is listening on port 2905

Linux: is anything listening on TCP 2905?
sudo ss -tlnp 'sport = :2905'
Linux: UDP 2905
sudo ss -ulnp 'sport = :2905'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2905
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2905 '
Windows (Command Prompt)
netstat -ano | findstr :2905
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2905 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2905
From Windows
Test-NetConnection HOST -Port 2905
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2905

Block port 2905 in the firewall

ufw
sudo ufw deny 2905/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2905 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2905 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2905' -Direction Inbound -Protocol TCP -LocalPort 2905 -Action Block
ufw
sudo ufw deny 2905/udp
iptables
sudo iptables -A INPUT -p udp --dport 2905 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2905 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2905' -Direction Inbound -Protocol UDP -LocalPort 2905 -Action Block

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