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Port 4738 (solera-lpn)

IANA assigns port 4738 to solera-lpn: SoleraTec Locator.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
solera-lpn TCP SoleraTec Locator Mark Armstrong -
solera-lpn UDP SoleraTec Locator Mark Armstrong -

Registry dates for this port: registered 2005-12.

Check what is listening on port 4738

Linux: is anything listening on TCP 4738?
sudo ss -tlnp 'sport = :4738'
Linux: UDP 4738
sudo ss -ulnp 'sport = :4738'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4738
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4738 '
Windows (Command Prompt)
netstat -ano | findstr :4738
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4738 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4738
From Windows
Test-NetConnection HOST -Port 4738
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4738

Block port 4738 in the firewall

ufw
sudo ufw deny 4738/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4738 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4738 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4738' -Direction Inbound -Protocol TCP -LocalPort 4738 -Action Block
ufw
sudo ufw deny 4738/udp
iptables
sudo iptables -A INPUT -p udp --dport 4738 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4738 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4738' -Direction Inbound -Protocol UDP -LocalPort 4738 -Action Block

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