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Port 1001 (webpush)

IANA assigns port 1001 to webpush: HTTP Web Push.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
webpush TCP HTTP Web Push IESG RFC 8030

Registry dates for this port: registered 2016-11-01.

Check what is listening on port 1001

Linux: is anything listening on TCP 1001?
sudo ss -tlnp 'sport = :1001'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1001
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1001 '
Windows (Command Prompt)
netstat -ano | findstr :1001
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1001 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1001
From Windows
Test-NetConnection HOST -Port 1001

Block port 1001 in the firewall

ufw
sudo ufw deny 1001/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1001 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1001 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1001' -Direction Inbound -Protocol TCP -LocalPort 1001 -Action Block

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