HTTPfy

Port 730 (netviewdm2)

IANA assigns port 730 to netviewdm2: IBM NetView DM/6000 send/tcp.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
netviewdm2 TCP IBM NetView DM/6000 send/tcp - -
netviewdm2 UDP IBM NetView DM/6000 send/tcp - -

Check what is listening on port 730

Linux: is anything listening on TCP 730?
sudo ss -tlnp 'sport = :730'
Linux: UDP 730
sudo ss -ulnp 'sport = :730'
Linux / macOS: which process owns the port
sudo lsof -nP -i :730
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':730 '
Windows (Command Prompt)
netstat -ano | findstr :730
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 730 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 730
From Windows
Test-NetConnection HOST -Port 730
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 730

Block port 730 in the firewall

ufw
sudo ufw deny 730/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 730 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 730 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 730' -Direction Inbound -Protocol TCP -LocalPort 730 -Action Block
ufw
sudo ufw deny 730/udp
iptables
sudo iptables -A INPUT -p udp --dport 730 -j DROP
nftables
sudo nft add rule inet filter input udp dport 730 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 730' -Direction Inbound -Protocol UDP -LocalPort 730 -Action Block

Related ports

716pana729netviewdm1731netviewdm3741netgw

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