Paste any IP address — or a whole list — and instantly know if it's valid IPv4, valid IPv6, or neither. The IPv4 / IPv6 Validator checks format, range, and CIDR notation so you don't have to remember every rule. No account, no upload, no limits — just fast, accurate IP validation right in your browser.
How to Validate an IP Address
- Enter your IP addresses — type or paste one per line into the input box. You can validate a single address or hundreds at once.
- Click Validate — the tool instantly checks each entry against IPv4 and IPv6 format rules.
- Review the results — each address is labeled Valid IPv4, Valid IPv6, Valid CIDR, or Invalid with a short explanation.
- Copy or export — use the Copy Results button to grab the output, or download it as a plain text file.
Why Use Flipper File to Validate IP Addresses?
- Supports both IPv4 and IPv6 — handles dotted-decimal IPv4, full IPv6, compressed IPv6 (::), and IPv4-mapped IPv6 addresses
- CIDR notation support — validates subnets like
192.168.1.0/24and2001:db8::/32in addition to plain addresses - Bulk validation — paste a list of any size and validate all entries at once with a clean per-line result
- Detailed feedback — invalid addresses show exactly what's wrong (wrong octet range, too many groups, bad characters, etc.)
- 100% in-browser — no IP address data is ever sent to a server; everything runs locally
- Free with no login — no account, no upload cap, no watermarks
Frequently Asked Questions
What is the difference between IPv4 and IPv6?
IPv4 (Internet Protocol version 4) uses 32-bit addresses written as four dot-separated numbers between 0–255, such as 192.168.0.1. IPv6 uses 128-bit addresses written as eight groups of four hexadecimal digits separated by colons, such as 2001:0db8:85a3:0000:0000:8a2e:0370:7334. IPv6 was developed to replace IPv4 as the global pool of IPv4 addresses runs out.
What makes an IPv4 address invalid?
An IPv4 address is invalid if it has fewer or more than four octets, if any octet is outside the range 0–255, if it contains letters or special characters, or if it has leading zeros in an octet (e.g., 192.168.01.1 is non-standard and often treated as invalid).
What makes an IPv6 address invalid?
An IPv6 address is invalid if it contains more than eight groups, if any group has more than four hexadecimal digits, if it uses characters outside 0–9 and a–f (case-insensitive), or if it uses the :: shorthand more than once.
Does this tool support CIDR notation?
Yes. You can enter addresses like 10.0.0.0/8, 172.16.0.0/12, or fe80::/10 and the tool will validate both the base address and the prefix length as a unit.
Can I validate a list of IPs all at once?
Yes — enter one IP address per line and click Validate. The tool processes each line independently and returns a labeled result for every entry, making it easy to audit large lists from logs, configs, or spreadsheets.
What are private IP address ranges?
The tool optionally flags whether an address falls in a private/reserved range. Common private IPv4 ranges include 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. These addresses are not routable on the public internet and are used in local networks.
Does the tool check if an IP address is reachable or online?
No — validation checks only the format and structure of the address. It does not ping, probe, or test whether the IP is live or reachable. Use a ping tool or traceroute for connectivity testing.
Is my data sent to a server when I use this tool?
No. All validation logic runs entirely in your browser using JavaScript. Your IP addresses are never transmitted to any server, stored, or logged.