HTTPfy

Port 7426 (pmdmgr)

IANA assigns port 7426 to pmdmgr: OpenView DM Postmaster Manager.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
pmdmgr TCP OpenView DM Postmaster Manager Dave Lamb -
pmdmgr UDP OpenView DM Postmaster Manager Dave Lamb -

Check what is listening on port 7426

Linux: is anything listening on TCP 7426?
sudo ss -tlnp 'sport = :7426'
Linux: UDP 7426
sudo ss -ulnp 'sport = :7426'
Linux / macOS: which process owns the port
sudo lsof -nP -i :7426
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':7426 '
Windows (Command Prompt)
netstat -ano | findstr :7426
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 7426 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 7426
From Windows
Test-NetConnection HOST -Port 7426
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 7426

Block port 7426 in the firewall

ufw
sudo ufw deny 7426/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 7426 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 7426 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 7426' -Direction Inbound -Protocol TCP -LocalPort 7426 -Action Block
ufw
sudo ufw deny 7426/udp
iptables
sudo iptables -A INPUT -p udp --dport 7426 -j DROP
nftables
sudo nft add rule inet filter input udp dport 7426 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 7426' -Direction Inbound -Protocol UDP -LocalPort 7426 -Action Block

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