Port 1001 WEBPUSH
Port 1001 is the IANA-assigned webpush port for HTTP Web Push (TCP).
What is port 1001 used for?
Port 1001 is assigned to webpush and uses TCP. The IANA registry describes the service as “HTTP Web Push”. It sits in the well-known range, which operating systems reserve for core network services, so software expects it at this number by default.
Ports are the transport-layer address a service listens on. A client that wants to reach webpush connects to port 1001. If nothing is listening, the connection is refused. That is why a port conflict appears whenever two processes try to bind the same number.
Use the commands below to confirm whether port 1001 is actually in use before you change firewall rules. Blocking the port stops new inbound traffic at the firewall, but it does not stop a local process from listening, and it does not remove the service from the machine.
Source: IANA Service Name and Transport Protocol Port Number Registry. Registered assignee: [IESG]. Reference: [RFC 8030].
Check and block port 1001
Copy-ready commands for the protocols assigned to this port. Run the check first, then block only what should not be reachable.
Check on Linux
sudo ss -tlpn 'sport = :1001'Check on Windows
Get-NetTCPConnection -LocalPort 1001 -State Listen -ErrorAction SilentlyContinueBlock with UFW
sudo ufw deny 1001/tcpBlock with iptables
sudo iptables -A INPUT -p tcp --dport 1001 -j DROPThese commands are examples for a typical host. Check the listener before you change firewall rules, and persist iptables rules with iptables-save or netfilter-persistent. On Windows, use Windows Defender Firewall or New-NetFirewallRule for persistent blocks. The iptables rules here cover IPv4; mirror them with ip6tables if IPv6 is enabled.
Is port 1001 safe to expose?
This port is not on our curated list of services with a widely exploited profile. Exposure is only safe when the listening service is intended, patched and protected by a firewall. Keep the listening service patched and remove it if unused. A default-deny firewall policy with explicit allow rules is still the safest baseline.
Where port 1001 is usually used
Most traffic on port 1001 falls into these scenarios. The demo below is a safe way to confirm the listener before you change anything.
- Serving a website, API or reverse-proxy traffic that clients reach on port 1001.
- Load-balancer and uptime checks probing the port before routing requests.
- Local development, where a browser or curl calls the service on localhost:1001.
Send a test request
Start a local web server, then ask the port for response headers. Replace 127.0.0.1 with the host you are testing.
curl -I http://127.0.0.1:1001Common problems with port 1001
Connection refused or timed out
Refused usually means the host is reachable but nothing is listening on port 1001. A timeout more often means a firewall drop, a wrong host or a service bound to a different interface.
Port already in use
Find the process holding the port with sudo ss -tlpn 'sport = :1001' or sudo lsof -i :1001. Stop that process or configure it to bind another port; killing it without identifying it can take down a production service.
Firewall rule did not survive a reboot
UFW and Windows Firewall keep rules across restarts. Raw iptables rules do not: save them with iptables-save or the netfilter-persistent package, and re-apply after upgrades that reset the ruleset.
The port is blocked but still reachable
A firewall rule filters inbound traffic; it does not close the listener. Confirm with the check command above and bind the service to 127.0.0.1 when only local clients need it.
Port 1001 at a glance
| Port number | 1001 |
|---|---|
| Service name | webpush |
| Transport protocol | TCP |
| Category | Web and HTTP |
| Range | Well-known port (0–1023) |
| Risk level | Standard/Low |
| Registered assignee | [IESG] |
| Reference | [RFC 8030] |
| Registry description | HTTP Web Push |
| Source | IANA Service Name and Transport Protocol Port Number Registry |
Frequently asked questions
What is port 1001 used for?
Port 1001 (WEBPUSH) uses TCP. HTTP Web Push.
How do I check if port 1001 is open?
On Linux run `sudo ss -tlpn 'sport = :1001'`. On Windows run `Get-NetTCPConnection -LocalPort 1001 -State Listen -ErrorAction SilentlyContinue` in PowerShell. If the port is open, the output shows a process listening on port 1001; empty output usually means nothing is bound to it.
How do I block port 1001?
With UFW run `sudo ufw deny 1001/tcp`. With iptables run `sudo iptables -A INPUT -p tcp --dport 1001 -j DROP`. Persist the iptables rules with your distribution's netfilter-persistent or iptables-save tooling so they survive a reboot.
Is port 1001 safe to expose?
This port is not on our curated list of services with a widely exploited profile. Exposure is only safe when the listening service is intended, patched and protected by a firewall. Nevertheless, keep the listening service patched and remove it if unused. A default-deny firewall policy with explicit allow rules is still the safest baseline.
Related ports
Primary data: IANA Service Name and Transport Protocol Port Number Registry.
Last reviewed 2026-10-30 · Methodology · About · Privacy