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Edge Notes Technology, Open Source & Practical Tools

Edge Tools — Developer & Network Utilities

Self-contained engineering utilities that execute 100% locally in your browser. No input data, IP addresses, JSON documents, or files are ever transmitted to any server.

IPv4 & IPv6 CIDR Subnet Calculator

Calculate network boundaries, masks, usable host ranges, RFC 3021 /31 and RFC 6164 /127 point-to-point links, and RFC 5952 IPv6 canonical forms.

Examples: 


        

          Need background on prefix math and point-to-point subnetting? Read our guide:
          Understanding IPv4 and IPv6 CIDR, Prefix Arithmetic, and Subnet Boundaries →
        

      


      
      

        

          

            
JSON Formatter & Validator

            

              Parse, validate, pretty-print, or minify RFC 8259 JSON documents safely using JSON.parse. Never evaluates JSON as executable JavaScript.
            

          

          

            
            
            
          

        


        

          
          
          
          
        


        

        

          

            
            
          

          

            
            
          

        

      


      
      

        

          

            
URL & Base64 Encoding Utility

            

              UTF-8 byte-accurate Base64 (RFC 4648 §4), URL-safe Base64URL (RFC 4648 §5), and URI percent-encoding with strict malformed-byte detection.
            

          

          

            
            
          

        


        

          
          
          
          
          
        


        

        

          

            
            
          

          

            
            
          

        

      


      
      

        

          

            
SHA-256 Cryptographic Digest & Checksum Verifier

            

              Compute FIPS 180-4 SHA-256 digests for text strings or local files using the browser Web Crypto API (crypto.subtle.digest). Files are hashed strictly inside local browser memory and never uploaded.
            

          

          Local Browser Execution Only
        


        

          

            

              
              
            


            

              
              
            


            

              
              
            


            

              
              
              
            

          


          

            
            

              
                

                  SHA-256 (Hex Lowercase)
                  ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad
                

                

                  SHA-256 (Hex Uppercase)
                  BA7816BF8F01CFEA414140DE5DAE2223B00361A396177A9CB410FF61F20015AD
                

                

                  SHA-256 (Base64)
                  ungWv48Bz+pBQUDeXa4iI7ADYaOWF3qctBD/YfIAFa0=
                

                

                  Input Metadata & Engine
                  UTF-8 Text Input (3 bytes)
                

              
            

            

              Learn more about verifying release tarballs and signature chains:
              How Cryptographic Hashes Verify File Integrity →