-
×
-
Developer tools
- HTML Tools CSS Tools JavaScript Tools JSON Tools XML Tools REST API Tester Regex Tester & Debugger PHP Beautifier/formatter SQL Tools CSV Tools INI Tools Java Beautifier/formatter Kotlin Beautifier/formatter OPML Beautifier/formatter OPML Minifier & Compressor BBCode to HTML Markdown to HTML YAML to JSON YAML to XML User agent parser URL parser
-
Network administrator tools
-
Checker tools
- DNS Lookup IP Lookup Reverse IP Lookup What is my Browser? SSL Lookup Whois Lookup Ping Test Internet Speed Test Check If Website Down or Not What is my screen resolution? HTTP headers lookup HTTP/2 Checker Credit Card Checker Safe URL checker Google cache checker URL redirect checker Password strength checker Website hosting checker File mime type checker Gravatar checker Check if JavaScript is enabled
-
Extractor Tools
-
Text tools
- Fancy Text Generator Tools Remover Tools Compare Texts Text separator Text size calculator Read Time Calculator ⏱ Words To Time Add Line Number To Text Find and Replace Text Online Text to speech Text Repeater IDN Punnycode converter Case converter Characters & Words & Lines counter Word Frequency Counter Letter Frequency Counter List randomizer Reverse words Vertical Text Generator Reverse letters Emojis remover Translate Text To Emoji Reverse list Sort in Alphabetical Order Sort Numbers Online Rune Translator - Braille Translator - ⠠ Palindrome checker
-
Color Converter Tools
-
Converter tools
- Decimal to Binary Binary to Decimal Decimal to Hexadecimal Hexadecimal to Decimal Decimal to Octal Octal to Decimal Binary to Hexadecimal Binary to Octal Octal to Binary Octal to Hexadecimal Hexadecimal to Octal Hexadecimal to Binary Base64 encoder Base64 decoder Base64 to Image Image to Base64 Image to Data URI Data URI to Image Domain To IP Converter URL encoder URL decoder Convert Text to Binary Convert Text to Hexadecimal ASCII converter Convert Text to Decimal Convert Text to Octal Morse converter Number to words converter
-
File Converter Tools
-
Generator tools
- PayPal link generator Signature generator Credit Card Generator Fake Name Generator Random Image Generator Placeholder Image Generator Slug generator Lorem Ipsum generator Password generator ASCII Art (AA) Generator Random Word Generator Random Phrase Generator Random QUOTE Generator QR Code Generator Random Date Generator Mailto link generator UTM link generator WhatsApp link generator YouTube Timestamp link generator Random number generator MD5-4-2 Hash Generator Tools SHA Hash Generator Tools RIPEMD Hash Generator Tools UUID v4 generator Bcrypt generator Whirlpool generator
-
Image manipulation tools
- Image optimizer Free Online Photo Editor Rotate Image Crop Image Online Flip & Mirror Image Online Resize Images Online Website screenshot PNG Image Converter Tools JPG Image Converter Tools WEBP Image Converter Tools BMP Image Converter Tools ICO Image Converter Tools GIF Image Converter Tools HEIC Image Converter Tools
-
PDF tools
-
SEO tools
- Preview Open Graph Meta Tags Domain Age Checker Robots.txt generator .htaccess File Generator Meta Tag Generator Meta tags checker Plagiarism Checker XML Sitemap Generator Keyword Rank Checker Keyword Density Checker Keywords Suggestion Tool Backlink Maker Backlink Checker Broken Link Checker Link Analyzer URL Rewriting Website Links Count Checker Link Price Calculator Mozrank PA-DA Checker Page Authority Checker Domain Authority Checker Domain Blacklist Checker Google Index Checker Search Engine Spider Simulator Pagespeed Insights Checker Website Page Size Checker Pinging Website Tool Email Privacy Tester Free Privacy Policy Generator Terms And Condition Generator Disclaimer Generator
-
Mathematical Tools
-
Unit converter tools
-
Time converter tools
-
Data converter tools
-
Misc tools
-
Fun & useful tools
UUID v4 generator
UUID v4 generator
A UUID (Universally Unique Identifier) is a 128-bit identifier that is designed to be globally unique and generated with very low likelihood of collisions. UUIDs are commonly used to uniquely identify objects, entities, or resources in computer systems and applications. They are particularly useful in distributed systems where multiple entities need to generate identifiers without the need for centralized coordination.
There are different versions of UUIDs, each with a different structure and method of generation. UUID version 4 (UUIDv4) is one of the most commonly used versions. It is defined in RFC 4122 and is sometimes referred to as a "random UUID." UUIDv4 is generated using a combination of random numbers or pseudorandom numbers and the MAC address of the computer's network interface card (NIC).
Here's a breakdown of the components of a UUIDv4:
- Version (4 bits): The version number that specifies the UUID version. In UUIDv4, this is always "0100".
- Variant (2 bits): The variant of the UUID. For UUIDv4, this is set to "10" to indicate the variant defined in RFC 4122.
- Timestamp (60 bits): In UUIDv4, this part is generated using random or pseudorandom numbers to ensure uniqueness.
- Node (48 bits): The MAC address of the computer's NIC, if available. If the MAC address is not available or cannot be accessed, this part is generated using random or pseudorandom numbers.
The use of random or pseudorandom numbers in UUIDv4 generation is intended to provide a high degree of randomness and ensure that UUIDs are unlikely to collide, even in distributed systems. However, it's important to note that the randomness of UUIDv4 is subject to the quality of the random number generator being used. In applications where cryptographic security is crucial, it's recommended to use a cryptographically secure random number generator.
UUIDv4 is widely supported across programming languages and platforms and is often used in various applications, including database systems, distributed systems, and web applications, where unique identifiers are needed.
Popular tools
5762
2023 - 2024, Worldwide
Found a bug or have a feature to request? Screenshot and report a bug on this page.