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Port 1524 (ingreslock)

IANA assigns port 1524 to ingreslock: ingres.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ingreslock TCP ingres - -
ingreslock UDP ingres - -

Check what is listening on port 1524

Linux: is anything listening on TCP 1524?
sudo ss -tlnp 'sport = :1524'
Linux: UDP 1524
sudo ss -ulnp 'sport = :1524'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1524
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1524 '
Windows (Command Prompt)
netstat -ano | findstr :1524
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1524 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1524
From Windows
Test-NetConnection HOST -Port 1524
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1524

Block port 1524 in the firewall

ufw
sudo ufw deny 1524/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1524 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1524 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1524' -Direction Inbound -Protocol TCP -LocalPort 1524 -Action Block
ufw
sudo ufw deny 1524/udp
iptables
sudo iptables -A INPUT -p udp --dport 1524 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1524 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1524' -Direction Inbound -Protocol UDP -LocalPort 1524 -Action Block

Related ports

1522ricardo-lm1523cichild-lm1525orasrv, prospero-np1526pdap-np

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