# IP Address Validator Validate IPv4 and IPv6 addresses with CIDR notation support > Canonical page: https://elysiatools.com/en/tools/ip-address-validator - **Category:** Validation - **Keywords:** ip, ipv4, ipv6, validator, cidr, subnet, network, address ## Overview The IP Address Validator is a straightforward online tool that checks if a given string is a valid IPv4 or IPv6 address, including support for CIDR notation. It helps ensure accuracy in network-related tasks by providing instant validation results. ## Inputs - **IP Address** (text): Enter IPv4 or IPv6 address (e.g., 192.168.1.1 or 2001:db8::1)... ## When to use - When configuring network devices or services to verify IP address formats before application. - To validate IP addresses in log files, databases, or user inputs for data consistency. - During software development or testing to prevent errors from malformed IP address entries. ## How it works - Enter an IP address in the input field, with optional CIDR notation for subnet specification. - The tool analyzes the input against standard IPv4 and IPv6 address formats and CIDR rules. - It returns a clear validation result indicating whether the address is valid or invalid. ## Use cases - Network administrators verifying IP addresses during router or firewall configuration. - Security analysts checking IP addresses in access logs or threat intelligence feeds. - Developers testing IP input validation in web forms or API endpoints. ## Frequently asked questions ### What IP address formats are supported? The tool supports both IPv4 (e.g., 192.168.1.1) and IPv6 (e.g., 2001:db8::1) addresses, with optional CIDR notation. ### What is CIDR notation? CIDR (Classless Inter-Domain Routing) notation combines an IP address with a prefix length, like 192.168.1.0/24, to define network ranges. ### What happens if I enter an invalid IP address? The tool will display an error message indicating the address is not valid, helping you identify formatting issues. ### Can I validate multiple IP addresses at once? No, this tool validates one IP address at a time. Enter each address separately for individual checks. ### Is there a cost or usage limit? No, the tool is free to use with no restrictions on the number of validations. ## Related tools - [Email Validator](https://elysiatools.com/en/tools/email-validator): Validate email addresses and check deliverability - [Global Phone Validator](https://elysiatools.com/en/tools/global-phone-validator): Validate phone numbers from multiple countries including China, US, and more with detailed formatting and carrier info - [Global Postal Code Validator](https://elysiatools.com/en/tools/global-postal-code-validator): Validate postal codes from multiple countries including US ZIP, UK Postcode, Canada, and more - [IBAN & SWIFT Validator](https://elysiatools.com/en/tools/iban-swift-validator): Validate International Bank Account Number (IBAN) and SWIFT/BIC codes with checksum verification - [Mod-11 Checksum Calculator](https://elysiatools.com/en/tools/mod11-checksum): Validate or generate numbers using the Modulus-11 (ISO 7064) check-digit algorithm with ISBN-10 (10..2), Norwegian-ID (3,7,6,1,8,9,4,5,2) and generic 2-7 weight schemes. - [ABA Routing Number Validator](https://elysiatools.com/en/tools/routing-number-validator): Validate 9-digit US ABA bank routing numbers (RTN) with MICR check-digit verification, Federal Reserve district lookup and ABA institution breakdown. - [US ZIP Code Validator](https://elysiatools.com/en/tools/us-zip-code-validator): Validate United States ZIP codes including standard 5-digit and ZIP+4 formats - [.env File Validator](https://elysiatools.com/en/tools/env-file-validator): Validate .env files for syntax errors and common issues ## Samples - [IP Address Samples](https://elysiatools.com/en/samples/ip-address): Collection of IPv4 and IPv6 addresses in various formats for validation testing - [MAC Address Samples](https://elysiatools.com/en/samples/mac-address): Collection of MAC addresses in various formats for validation testing - [Android Image Processing Java Samples](https://elysiatools.com/en/samples/android-image-processing-java): Android Java image processing examples including reading/saving images, scaling, and format conversion - [Android Image Processing Kotlin Samples](https://elysiatools.com/en/samples/android-image-processing-kotlin): Android Kotlin image processing examples including reading/saving images, scaling, and format conversion ## Related content - [Network Infrastructure Identifier Format Checks](https://elysiatools.com/en/hubs/network-infrastructure-identifier-format-checks): Check IPv4 and IPv6 addresses, CIDR values, MAC addresses, AWS ARNs, and Docker image references before downstream processing, while keeping format evidence separate from reachability, ownership, permissions, and image availability. - [Network Triage, Packet Inspection, and Endpoint Debugging](https://elysiatools.com/en/hubs/network-triage-debugging): Inspect captures, replay webhooks, validate addresses and CIDR ranges, check DNS, WHOIS, hosts files, TLS, and user agents, then record a focused network diagnosis. - [Network Address Conversion and Evidence Preparation](https://elysiatools.com/en/hubs/network-convert): Validate addresses, convert IPv4 and IPv6 formats, normalize URL and webhook inputs, and package DNS, hosts, port, WHOIS, and packet evidence for review.