HTTPfy

Port 44900 (m3da, m3da-disc)

IANA assigns port 44900 to m3da, m3da-disc: M3DA is used for efficient machine-to-machine communications.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
m3da TCP M3DA is used for efficient machine-to-machine communications Eclipse Foundation -
m3da-disc UDP M3DA Discovery is used for efficient machine-to-machine communications Eclipse Foundation -

Registry dates for this port: registered 2013-02-22.

Check what is listening on port 44900

Linux: is anything listening on TCP 44900?
sudo ss -tlnp 'sport = :44900'
Linux: UDP 44900
sudo ss -ulnp 'sport = :44900'
Linux / macOS: which process owns the port
sudo lsof -nP -i :44900
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':44900 '
Windows (Command Prompt)
netstat -ano | findstr :44900
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 44900 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 44900
From Windows
Test-NetConnection HOST -Port 44900
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 44900

Block port 44900 in the firewall

ufw
sudo ufw deny 44900/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 44900 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 44900 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 44900' -Direction Inbound -Protocol TCP -LocalPort 44900 -Action Block
ufw
sudo ufw deny 44900/udp
iptables
sudo iptables -A INPUT -p udp --dport 44900 -j DROP
nftables
sudo nft add rule inet filter input udp dport 44900 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 44900' -Direction Inbound -Protocol UDP -LocalPort 44900 -Action Block

Related ports

44600asihpi44818EtherNet/IP (CIP)45000asmp, asmp-mon45001asmps

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