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Port 4041 (houston)

IANA assigns port 4041 to houston: Rocketeer-Houston.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
houston TCP Rocketeer-Houston Johnny C Norris II -
houston UDP Rocketeer-Houston Johnny C Norris II -

Check what is listening on port 4041

Linux: is anything listening on TCP 4041?
sudo ss -tlnp 'sport = :4041'
Linux: UDP 4041
sudo ss -ulnp 'sport = :4041'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4041
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4041 '
Windows (Command Prompt)
netstat -ano | findstr :4041
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4041 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4041
From Windows
Test-NetConnection HOST -Port 4041
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4041

Block port 4041 in the firewall

ufw
sudo ufw deny 4041/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4041 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4041 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4041' -Direction Inbound -Protocol TCP -LocalPort 4041 -Action Block
ufw
sudo ufw deny 4041/udp
iptables
sudo iptables -A INPUT -p udp --dport 4041 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4041 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4041' -Direction Inbound -Protocol UDP -LocalPort 4041 -Action Block

Related ports

4039fazzt-admin4040yo-main4042ldxp4043nirp

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