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Port 729 (netviewdm1)

IANA assigns port 729 to netviewdm1: IBM NetView DM/6000 Server/Client.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
netviewdm1 TCP IBM NetView DM/6000 Server/Client - -
netviewdm1 UDP IBM NetView DM/6000 Server/Client - -

Check what is listening on port 729

Linux: is anything listening on TCP 729?
sudo ss -tlnp 'sport = :729'
Linux: UDP 729
sudo ss -ulnp 'sport = :729'
Linux / macOS: which process owns the port
sudo lsof -nP -i :729
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':729 '
Windows (Command Prompt)
netstat -ano | findstr :729
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 729 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 729
From Windows
Test-NetConnection HOST -Port 729
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 729

Block port 729 in the firewall

ufw
sudo ufw deny 729/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 729 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 729 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 729' -Direction Inbound -Protocol TCP -LocalPort 729 -Action Block
ufw
sudo ufw deny 729/udp
iptables
sudo iptables -A INPUT -p udp --dport 729 -j DROP
nftables
sudo nft add rule inet filter input udp dport 729 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 729' -Direction Inbound -Protocol UDP -LocalPort 729 -Action Block

Related ports

715iris-lwz716pana730netviewdm2731netviewdm3

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