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Port 7725 (nitrogen)

IANA assigns port 7725 to nitrogen: Nitrogen Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nitrogen TCP Nitrogen Service Randy Lomnes -
nitrogen UDP Nitrogen Service Randy Lomnes -

Registry dates for this port: registered 2004-11.

Check what is listening on port 7725

Linux: is anything listening on TCP 7725?
sudo ss -tlnp 'sport = :7725'
Linux: UDP 7725
sudo ss -ulnp 'sport = :7725'
Linux / macOS: which process owns the port
sudo lsof -nP -i :7725
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':7725 '
Windows (Command Prompt)
netstat -ano | findstr :7725
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 7725 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 7725
From Windows
Test-NetConnection HOST -Port 7725
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 7725

Block port 7725 in the firewall

ufw
sudo ufw deny 7725/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 7725 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 7725 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 7725' -Direction Inbound -Protocol TCP -LocalPort 7725 -Action Block
ufw
sudo ufw deny 7725/udp
iptables
sudo iptables -A INPUT -p udp --dport 7725 -j DROP
nftables
sudo nft add rule inet filter input udp dport 7725 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 7725' -Direction Inbound -Protocol UDP -LocalPort 7725 -Action Block

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