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Port 20046 (tmophl7mts)

IANA assigns port 20046 to tmophl7mts: TMOP HL7 Message Transfer Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
tmophl7mts TCP TMOP HL7 Message Transfer Service Tim Riley -
tmophl7mts UDP TMOP HL7 Message Transfer Service Tim Riley -

Registry dates for this port: registered 2009-07-31.

Check what is listening on port 20046

Linux: is anything listening on TCP 20046?
sudo ss -tlnp 'sport = :20046'
Linux: UDP 20046
sudo ss -ulnp 'sport = :20046'
Linux / macOS: which process owns the port
sudo lsof -nP -i :20046
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':20046 '
Windows (Command Prompt)
netstat -ano | findstr :20046
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 20046 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 20046
From Windows
Test-NetConnection HOST -Port 20046
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 20046

Block port 20046 in the firewall

ufw
sudo ufw deny 20046/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 20046 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 20046 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 20046' -Direction Inbound -Protocol TCP -LocalPort 20046 -Action Block
ufw
sudo ufw deny 20046/udp
iptables
sudo iptables -A INPUT -p udp --dport 20046 -j DROP
nftables
sudo nft add rule inet filter input udp dport 20046 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 20046' -Direction Inbound -Protocol UDP -LocalPort 20046 -Action Block

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