Port 8081: HTTP-alt
Port 8081 is a common secondary alternate HTTP port, often used to run a second web service or proxy alongside something already listening on port 8080. Like 8080, it needs no root privileges to bind.
TCPWebUnencrypted by default
| Port number | 8081 |
|---|---|
| Service | Alternate HTTP / proxy |
| Protocol | TCP |
| Category | Web |
| Default encryption | No |
Security note. Port 8081 is not encrypted by default. Restrict it to trusted networks, or use an encrypted alternative where one exists, to avoid exposing credentials and data in transit.
Frequently asked questions
What is port 8081 used for?
Port 8081 is a common secondary alternate HTTP port, often used to run a second web service or proxy alongside something already listening on port 8080. Like 8080, it needs no root privileges to bind.
Is port 8081 TCP or UDP?
Port 8081 (HTTP-alt) uses TCP.
Is port 8081 secure?
Port 8081 is not encrypted by default. Where possible, use an encrypted alternative or tunnel it over TLS or a VPN.
Should I open port 8081 on my firewall?
Only if you specifically need HTTP-alt. Expose it to the smallest set of trusted sources, and never open database or Windows-service ports to the whole internet.