aruljohn.com valid

ArulJohn.com

ArulJohn.com hosts a diverse array of free, developer-friendly online tools, APIs and datasets. And a personal blog too.

For agents: Free online developer utilities: MAC/OUI vendor lookup, IP and hostname tools, ZIP code and airport code lookups, plus datasets and a personal blog.

ip lookupmac address ouizip code lookupnetwork toolssubnet calculator

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-21T09:19:02.414Z. Cached copy · Source on aruljohn.com

# ArulJohn.com
> ArulJohn.com hosts a diverse array of free, developer-friendly online tools, APIs and datasets. And a personal blog too.

## Online Tools

- [MAC Address / OUI Lookup](https://aruljohn.com/mac.pl): Find vendor information, generate random MACs, or perform bulk lookups. *Usage: Enter a MAC address or OUI to look up vendor details, or select the random generator option to create test MACs.*
- [IP Address Lookup](https://aruljohn.com/track.pl): Perform IP lookups, hostname conversions, subnet calculations, blacklist checks, and SSL expiration checks. This online utility has been up since 2000. *Usage: Choose a specific network tool from the utilities menu and enter the required IP, hostname, or domain.*
- [Zip Code Lookup](https://aruljohn.com/zip/): Retrieve city, state, latitude, and longitude for any U.S. ZIP code. *Usage: Type a ZIP code or City,State to get geographic details instantly.*
- [Airport & Airline Code Lookup](https://aruljohn.com/airport-codes/): Look up IATA/ICAO codes for airports and airlines. *Usage: Enter airport or airline names to retrieve corresponding international codes.*
- [Airline Code Database IATA ✈️](https://aruljohn.com/airline-codes/): This is a list of all available airline codes in the world right now. You can search by airline code, name of airline or country.
- [Gzip Compression Test](https://aruljohn.com/gziptest/): Check if a webpage is served with gzip compression. *Usage: Paste a URL to instantly test whether the server compresses responses.*

## Blog Content
- [Blog and Articles](https://aruljohn.com/blog/): Arul's Technical and General Blog
- [How to Find the IP Address of the Email Sender](https://aruljohn.com/blog/howtofindipaddress/): When you receive an email, you receive more than just the message. The email comes with headers that carry important information that can tell where the email was sent from and possibly who sent it. For that, you would need to find the IP address of the sender. The tutorial below can help you find the IP address of the sender.
- [How to Install Python 3.14.7 From Source](https://aruljohn.com/blog/install-python/): Here are steps to install Python 3.14.7 from source on your Linux machine. This tutorial will work for Debian, Ubuntu and their derivatives, Red Hat, Fedora and most Linux operating systems.
- [How to Find Ad-Free Video Links on Einthusan](https://aruljohn.com/blog/find-ad-free-einthusan-videos/): A few people asked me how to find direct video links of videos on the Einthusan website, which is similar to TubiTV, Crackle and YouTube. Unfortunately, they were put off by gazillion intrusive ads, and wanted to know if there was a way to watch the movies and videos without ads. I look around, and, yes, there is a way to watch videos with zero ads.



## About ArulJohn.com
- [About me](https://aruljohn.com/about/): About me
- [Contact me](https://aruljohn.com/contact/): How to contact me

Related sites

Other listed sites in Developer tools. See the whole category →

Machine-readable: GET /v1/resolve?q=aruljohn.com · GET /v1/domain/aruljohn.com · this page as Accept: application/json or text/markdown · MCP lookup_domain

Automatically discovered from public files. Inclusion does not imply endorsement or publisher participation.

Claim my listing on Agent Web Map for aruljohn.com:
1. POST https://agentwebmap.com/v1/sites/aruljohn.com/claims and keep claim_id and claim_secret private.
2. Publish the proof: add the line "AgentWebMap ownership: <token>" (token from step 1) to https://aruljohn.com/llms.txt, or use the DNS, meta-tag or well-known method the response describes.
3. POST https://agentwebmap.com/v1/sites/aruljohn.com/verify with {"claim_id": "...", "claim_secret": "..."}.
4. Save the api_key from the answer; it manages the listing (PATCH https://agentwebmap.com/v1/sites/aruljohn.com).
MCP equivalent: tools begin_ownership_claim, then verify_domain, at https://agentwebmap.com/mcp. Docs: https://agentwebmap.com/docs#verify

Corrections or removal requests: contact the directory.