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Port 1528 (norp)

IANA assigns port 1528 to norp: Not Only a Routeing Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
norp TCP Not Only a Routeing Protocol nyantec -
norp UDP Not Only a Routeing Protocol nyantec -
norp SCTP Not Only a Routeing Protocol nyantec -

Registry dates for this port: registered 2016-09-13, last modified 2021-04-07.

Check what is listening on port 1528

Linux: is anything listening on TCP 1528?
sudo ss -tlnp 'sport = :1528'
Linux: UDP 1528
sudo ss -ulnp 'sport = :1528'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1528
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1528 '
Windows (Command Prompt)
netstat -ano | findstr :1528
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1528 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1528
From Windows
Test-NetConnection HOST -Port 1528
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1528

Block port 1528 in the firewall

ufw
sudo ufw deny 1528/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1528 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1528 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1528' -Direction Inbound -Protocol TCP -LocalPort 1528 -Action Block
ufw
sudo ufw deny 1528/udp
iptables
sudo iptables -A INPUT -p udp --dport 1528 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1528 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1528' -Direction Inbound -Protocol UDP -LocalPort 1528 -Action Block

Related ports

1526pdap-np1527tlisrv1529coauthor1530rap-service

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