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Port 4038 (fazzt-ptp)

IANA assigns port 4038 to fazzt-ptp: Fazzt Point-To-Point.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
fazzt-ptp TCP Fazzt Point-To-Point - -
fazzt-ptp UDP Fazzt Point-To-Point - -

Check what is listening on port 4038

Linux: is anything listening on TCP 4038?
sudo ss -tlnp 'sport = :4038'
Linux: UDP 4038
sudo ss -ulnp 'sport = :4038'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4038
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4038 '
Windows (Command Prompt)
netstat -ano | findstr :4038
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4038 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4038
From Windows
Test-NetConnection HOST -Port 4038
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4038

Block port 4038 in the firewall

ufw
sudo ufw deny 4038/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4038 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4038 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4038' -Direction Inbound -Protocol TCP -LocalPort 4038 -Action Block
ufw
sudo ufw deny 4038/udp
iptables
sudo iptables -A INPUT -p udp --dport 4038 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4038 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4038' -Direction Inbound -Protocol UDP -LocalPort 4038 -Action Block

Related ports

4036wap-push-https4037ravehd4039fazzt-admin4040yo-main

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