Does Well-Known Port upload my file or text to Tool-You servers?

No. Well-Known Port runs in this browser tab. Files stay on the device. Limit note: Port 0–65535. Unknown → unknown.

Should I use Host Port Split instead of Well-Known Port?

Use Well-Known Port when you need Name a common TCP/UDP port. Use Host Port Split when you need Split host:port; optional default port. They share a category (Network) but not the same job.

Well-Known Port

Name a common TCP/UDP port.

Maps a well-known port number to a common service name when known. Unlike Host Port Split this names the port. Unlike HTTP Status this is ports, not status codes. Port 0–65535.

What Well-Known Port does

Maps a well-known port number to a common service name when known. Unlike Host Port Split this names the port. Unlike HTTP Status this is ports, not status codes. Port 0–65535.

Well-Known Port sits in the Network group on purpose. It is not Host Port Split (Split host:port; optional default port.) and not HTTP Status Phrase (HTTP status phrase and class (1xx–5xx).). Choose this page when you need Name a common TCP/UDP port. If you stretch Well-Known Port into a neighbor’s job, the result will look wrong even though the site chrome looks the same.

How to use Well-Known Port

Keep this tab on Well-Known Port (/network/well-known-port). Pasting into the wrong Network tool (for example Host Port Split) changes the job.
Paste or type the input Well-Known Port expects. Path hint: network · well known port. Name a common TCP/UDP port.
Apply the Well-Known Port action only. HTTP Status Phrase is a different transform (HTTP status phrase and class (1xx–5xx).). Maps a well-known port number to a common service name when known. Unlike Host Port Split this names the port. Unlike HTTP Status this is ports, not status codes. Port 0–65535.
Copy the output of Well-Known Port if you need it elsewhere. Size/complexity still follows: Port 0–65535. Unknown → unknown.
If the text job is actually Split host:port; optional default port., leave Well-Known Port and open Host Port Split.

When not to use Well-Known Port

Skip Well-Known Port when a neighbor tool matches better — start with Host Port Split or HTTP Status Phrase — or when the description already warns the job will fail. In the tool’s own words: Maps a well-known port number to a common service name when known. Unlike Host Port Split this names the port. Unlike HTTP Status this is ports, not status codes. Port 0–65535.

Questions about Well-Known Port

What does Well-Known Port do that other Network pages on this site do not?: Maps a well-known port number to a common service name when known. Unlike Host Port Split this names the port. Unlike HTTP Status this is ports, not status codes. Port 0–65535. Short version: Name a common TCP/UDP port.
Does Well-Known Port upload my file or text to Tool-You servers?: No. Well-Known Port runs in this browser tab. Files stay on the device. Limit note: Port 0–65535. Unknown → unknown.
Should I use Host Port Split instead of Well-Known Port?: Use Well-Known Port when you need Name a common TCP/UDP port. Use Host Port Split when you need Split host:port; optional default port. They share a category (Network) but not the same job.
What are the limits of Well-Known Port?: Port 0–65535. Unknown → unknown. Also: Maps a well-known port number to a common service name when known. Unlike Host Port Split this names the port. Unlike HTTP Status this is ports, not status codes. Port 0–65535.