What Are IP '127.0.0.1' & Ports ':49342', ':57573', and ':62893'? 

An IP address, short for 'Internet Protocol', is a unique series of numbers separated by periods (e.g., 94.63.21.182) that identifies a specific device on the internet, enabling data receiving and sending and communication across devices, ranging from 0.0.0.0 to 255.255.255.255.

127.0.0.1, commonly referred to as 'localhost', is a loopback IP address that lets a computer to communicate with itself for testing and troubleshooting purposes, without requiring an internet connection or other devices which is similar to how '142.250.72.206' is the address for 'google.com', with the key difference being that the latter requires an internet connection and other devices to connect to an external network.

And ':49342', ':57573', and ':62893' parts are ones of the 65,535 possible port numbers, extending from 1 to 65,535, added after 'http://127.0.0.1:' (or 'http://localhost:') and are used internally to route data, such as HTML files, to specific services, databases, or applications (like a local web server) on the same computer. 

Personal Stories

pro-tip: when both "localhost" and "127.0.0.1" feel too long to type, just type "127.1":

@fasterthanlime

As an illustration, a web designer working on an e-commerce site might use port '49342' to test the 'homepage' of a website in a browser (Google Chrome, Mozilla Firefox, Safari, and Microsoft Edge) locally, without publishing it on a live server, with similar uses for ports '57573' for an 'About' page and '62893' for a 'Contact' page, simultaneously.

What Are System (:80), Registered (:3306), and Dynamic (:49342) Ports?

Those 65,535 ports replaced after the localhost (127.0.0.1) is divided into three groups, known as (1) system ports (0 to 1023), (2) registered (user) ports (1024 to 49151) and (3) dynamic (ephemeral or private) ports (49152 to 65535).

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Ports between 49152 and 65535 are unregistered and are considered dynamic (or private). These ports are available for any temporary or ad hoc use, particularly on private networks.

You can be confident that they won’t clash with known applications or services.

@LinuxHandbook

System (well-known) ports (0-1023) are reserved for widely used, essential and foundational internet protocols and services; for instance, ':80' is used by HTTP (Hypertext Transfer Protocol), which is the foundation of data sending and receiving on the web; ':443' is used by HTTPS (HTTP Secure), which encrypts data for secure web browsing; and ':53' is used by DNS (Domain Name System) that turns domain names (youtube.com, tiktok.com) into IP addresses (127.21.85.122, 95.165.11.2)

Registered (or user) ports (1024-49151) are assigned to particular applications or services by the Internet Assigned Numbers Authority (IANA) upon request and are often associated with proprietary software or applications—those owned by an individual/company, not open for the public to freely use, modify, or distribute, with owners holding exclusive rights to the software; for example, ':3306' is used by MYSQL for database access, ':1433' is used by Microsoft SQL for database management and querying, and ':8080' is used by HTTP Proxy servers or as an alternative HTTP port for web traffic.

Dynamic (ephemeral or private) ports (49152-65535) are used by desktop applications for temporary connections and tasks; for instance, when you open a web browser to visit a website, the browser uses one of these short-lived ports to connect to the web server, and it is used only while loading the site and closes once you are done.

What Are IPs 127.0.0.1:49342, 57573, and 62893 Used For?

127.0.0.1:49342, 57573, and 62893 fall in dynamic ports category, meaning it is typically chosen for a temporary connection or session by one of your desktop software.

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lsof -i TCP:80 # Show what processes are using port 80 either locally or remotely. Need to be root for unowned processes.

@climagic

To give you an idea, provided that you have antivirus software like Kaspersky installed, it might use dynamic ports like 127.0.0.1:49342 to temporarily connect and scan a website for harmful content, such as malware or phishing attempts, and once the scan is complete, the connection closes, allowing you to safely continue browsing.

That said, dynamic ports may also be exploited by malicious software, such as viruses and Trojans, to establish temporary connections for communicating with remote servers, downloading malicious payloads, exfiltrating data, or receiving instructions from a command-and-control server to spread further within the network.

Related: 

10.0.0.1 Piso WiFi Meaning, Pause Time and More

For that reason, you should monitor currently which apps are using your localhost and ports like ':49342', ':57573', and ':62893', and take the necessary action afterward, such as researching what the program uses the port for in the case of a safe app, or deleting or removing it if the app is deemed unsafe.

Find Localhost Using Apps on Windows

Open Command Prompt on Windows.

Write netstat -ano | findstr "127.0.0.1" and press Enter key.

Find 127.0.0.1:49342, 57573, or 62893 and its PID number such as 6212.

Open Task Manager.

Tap Details and match PID number (i.e., 6212) with an app too see which app using 127.0.0.1:49342, 57573, or 62893.

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Find Localhost Using Apps on MacOS/Linux

Find Terminal on MacOS (Mac, Macbook and so forth).

Open Terminal.

Write sudo lsof -i @127.0.0.1 and press Return key.

See COMMAND and NAME to find out which apps using 127.0.0.1 in which ports.

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Why and Where Are 127.0.0.1:49342, 57573, and 62893 Used?

Some browser extensions or desktop applications, such as password managers, note-taking apps, or VPNs, set up local servers using ports to securely manage their interfaces, sometimes leaving traces in history or bookmarks if accessed in the browser. 

Many tools, such as media servers, database managers, or virtual machines, create a local web-based interface for configuration and control, typically accessible only on your machine via 127.0.0.1, and use a random high port (like 49253) to avoid conflicts with standard web ports (80, 443). 

Sometimes, software sets up temporary HTTP/HTTPS services for tasks like file transfers between applications, running on random local ports like 57573. 

Personal Stories

Guys I'm so excited I finally ported my code to run in a browser! Check out localhost:3000 to try it out for yourselves!!!

@HohBrian

When working on web development, you might even use a local server to test your code, with the 127.0.0.1 address (localhost) and random ports like 62893 assigned by your system.