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Port 149 (aed-512)

IANA assigns port 149 to aed-512: AED 512 Emulation Service.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
aed-512 TCP AED 512 Emulation Service Albert G Broscius -
aed-512 UDP AED 512 Emulation Service Albert G Broscius -

Check what is listening on port 149

Linux: is anything listening on TCP 149?
sudo ss -tlnp 'sport = :149'
Linux: UDP 149
sudo ss -ulnp 'sport = :149'
Linux / macOS: which process owns the port
sudo lsof -nP -i :149
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':149 '
Windows (Command Prompt)
netstat -ano | findstr :149
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 149 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 149
From Windows
Test-NetConnection HOST -Port 149
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 149

Block port 149 in the firewall

ufw
sudo ufw deny 149/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 149 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 149 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 149' -Direction Inbound -Protocol TCP -LocalPort 149 -Action Block
ufw
sudo ufw deny 149/udp
iptables
sudo iptables -A INPUT -p udp --dport 149 -j DROP
nftables
sudo nft add rule inet filter input udp dport 149 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 149' -Direction Inbound -Protocol UDP -LocalPort 149 -Action Block

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