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Port 2904 (m2ua)

IANA assigns port 2904 to m2ua: M2UA.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
m2ua TCP M2UA Lyndon Ong -
m2ua UDP M2UA Lyndon Ong -
m2ua SCTP M2UA Lyndon Ong -

Check what is listening on port 2904

Linux: is anything listening on TCP 2904?
sudo ss -tlnp 'sport = :2904'
Linux: UDP 2904
sudo ss -ulnp 'sport = :2904'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2904
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2904 '
Windows (Command Prompt)
netstat -ano | findstr :2904
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2904 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2904
From Windows
Test-NetConnection HOST -Port 2904
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2904

Block port 2904 in the firewall

ufw
sudo ufw deny 2904/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2904 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2904 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2904' -Direction Inbound -Protocol TCP -LocalPort 2904 -Action Block
ufw
sudo ufw deny 2904/udp
iptables
sudo iptables -A INPUT -p udp --dport 2904 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2904 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2904' -Direction Inbound -Protocol UDP -LocalPort 2904 -Action Block

Related ports

2902netaspi2903suitcase2905m3ua, De-registered2906caller9

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