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Port 438 (dsfgw)

IANA assigns port 438 to dsfgw.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
dsfgw TCP dsfgw Andy McKeen -
dsfgw UDP dsfgw Andy McKeen -

Check what is listening on port 438

Linux: is anything listening on TCP 438?
sudo ss -tlnp 'sport = :438'
Linux: UDP 438
sudo ss -ulnp 'sport = :438'
Linux / macOS: which process owns the port
sudo lsof -nP -i :438
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':438 '
Windows (Command Prompt)
netstat -ano | findstr :438
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 438 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 438
From Windows
Test-NetConnection HOST -Port 438
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 438

Block port 438 in the firewall

ufw
sudo ufw deny 438/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 438 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 438 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 438' -Direction Inbound -Protocol TCP -LocalPort 438 -Action Block
ufw
sudo ufw deny 438/udp
iptables
sudo iptables -A INPUT -p udp --dport 438 -j DROP
nftables
sudo nft add rule inet filter input udp dport 438 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 438' -Direction Inbound -Protocol UDP -LocalPort 438 -Action Block

Related ports

436dna-cml437comscm439dasp440sgcp

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