HTTPfy

Port 44 (mpm-flags)

IANA assigns port 44 to mpm-flags: MPM FLAGS Protocol.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
mpm-flags TCP MPM FLAGS Protocol - -
mpm-flags UDP MPM FLAGS Protocol - -

Check what is listening on port 44

Linux: is anything listening on TCP 44?
sudo ss -tlnp 'sport = :44'
Linux: UDP 44
sudo ss -ulnp 'sport = :44'
Linux / macOS: which process owns the port
sudo lsof -nP -i :44
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':44 '
Windows (Command Prompt)
netstat -ano | findstr :44
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 44 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 44
From Windows
Test-NetConnection HOST -Port 44
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 44

Block port 44 in the firewall

ufw
sudo ufw deny 44/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 44 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 44 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 44' -Direction Inbound -Protocol TCP -LocalPort 44 -Action Block
ufw
sudo ufw deny 44/udp
iptables
sudo iptables -A INPUT -p udp --dport 44 -j DROP
nftables
sudo nft add rule inet filter input udp dport 44 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 44' -Direction Inbound -Protocol UDP -LocalPort 44 -Action Block

Related ports

42name, nameserver43nicname45mpm46mpm-snd

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