Port 150 (sql-net)

IANA assigns port 150 to sql-net: SQL-NET.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference

sql-net TCP SQL-NET Martin Picard -

sql-net UDP SQL-NET Martin Picard -

Linux: is anything listening on TCP 150?

sudo ss -tlnp 'sport = :150'

Linux: UDP 150

sudo ss -ulnp 'sport = :150'

Linux / macOS: which process owns the port

sudo lsof -nP -i :150

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':150 '

Windows (Command Prompt)

netstat -ano | findstr :150

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 150 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 150

From Windows

Test-NetConnection HOST -Port 150

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 150

ufw

sudo ufw deny 150/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 150 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 150 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 150' -Direction Inbound -Protocol TCP -LocalPort 150 -Action Block

ufw

sudo ufw deny 150/udp

iptables

sudo iptables -A INPUT -p udp --dport 150 -j DROP

nftables

sudo nft add rule inet filter input udp dport 150 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 150' -Direction Inbound -Protocol UDP -LocalPort 150 -Action Block

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