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Port 1526 (pdap-np)

IANA assigns port 1526 to pdap-np: Prospero Data Access Prot non-priv.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
pdap-np TCP Prospero Data Access Prot non-priv B Clifford Neuman -
pdap-np UDP Prospero Data Access Prot non-priv B Clifford Neuman -

Check what is listening on port 1526

Linux: is anything listening on TCP 1526?
sudo ss -tlnp 'sport = :1526'
Linux: UDP 1526
sudo ss -ulnp 'sport = :1526'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1526
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1526 '
Windows (Command Prompt)
netstat -ano | findstr :1526
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1526 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1526
From Windows
Test-NetConnection HOST -Port 1526
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1526

Block port 1526 in the firewall

ufw
sudo ufw deny 1526/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1526 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1526 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1526' -Direction Inbound -Protocol TCP -LocalPort 1526 -Action Block
ufw
sudo ufw deny 1526/udp
iptables
sudo iptables -A INPUT -p udp --dport 1526 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1526 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1526' -Direction Inbound -Protocol UDP -LocalPort 1526 -Action Block

Related ports

1524ingreslock1525orasrv, prospero-np1527tlisrv1528norp

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