IP Validation - Validate IPv4 & IPv6 Addresses
Check if an IP address is valid and properly formatted. Our validator supports both IPv4 and IPv6 addresses and identifies common format errors.
Understanding This Tool
What It Does
This tool checks whether the text you enter is a correctly formatted IP address. When you submit an address, the form posts it to our server, which tests it against both IPv4 and IPv6 syntax rules and reports whether it is valid and which version it matches. It checks format and syntax only - it does not contact the address, look up its owner, or verify that the IP is live, assigned, or reachable.
Understanding the Results
- Status: Shows Valid if the input is a syntactically correct IPv4 or IPv6 address, or Invalid if it matches neither format. This reflects format only - a Valid result does not mean the address is online or in use.
- Type: Identifies the matched version as IPv4 (for addresses like 8.8.8.8) or IPv6 (for addresses like 2001:4860:4860::8888). If the input matches neither format, this field shows Invalid.
Common Use Cases
- Catch typos before use: Confirm an address you copied or typed - into a config file, firewall rule, or DNS record - is well formed before relying on it.
- Tell IPv4 from IPv6: Quickly identify which IP version a given address belongs to when you are unsure.
- Clean up data entry: Verify individual addresses pulled from logs, spreadsheets, or forms are in proper format.
- Learning and teaching: Test example addresses to understand what counts as a valid IPv4 or IPv6 string and what gets rejected.
- Sanity-check tool input: Confirm an address is correctly formatted before pasting it into a lookup, ping, or WHOIS tool that expects a clean IP.
Pro Tips & Best Practices
- Enter one bare address at a time: The validator expects a single IP. A CIDR range like 192.168.1.0/24 or an address with a port like 8.8.8.8:53 is rejected as Invalid because those are not plain IP addresses.
- Valid does not mean public: Private and reserved addresses such as 192.168.1.1, 10.0.0.0, and 127.0.0.1 pass as Valid because they are correctly formatted - the tool does not flag them as private.
- Surrounding spaces are tolerated: The input is trimmed before checking, so leading or trailing whitespace will not by itself make a valid address fail.
- Use it for format, not status: A Valid result tells you the syntax is right, not that the address is reachable or assigned. Pair it with a ping or WHOIS tool if you need to know more.
Frequently Asked Questions
No. The tool only checks that the address is correctly formatted as IPv4 or IPv6. It does not ping the address, contact any server, or verify that the IP is assigned, routable, or live. A Valid result simply means the syntax is correct.
Because it is a correctly formatted IPv4 address. The validator checks format against IPv4 and IPv6 rules but does not exclude private, reserved, or loopback ranges, so addresses such as 192.168.1.1, 10.0.0.0, and 127.0.0.1 all return Valid.
No. The tool validates a single bare IP address only. Inputs like a CIDR range (192.168.1.0/24) or an address with a port appended (8.8.8.8:53) are not plain IP addresses, so they are reported as Invalid.
It tests your input against IPv4 format rules and IPv6 format rules separately. If it matches IPv4 it reports IPv4, if it matches IPv6 it reports IPv6, and if it matches neither the Type is shown as Invalid alongside an Invalid status.
On the server. When you click Validate, the address is submitted via a form POST and the format check runs server-side, then the result is returned to your page. No external lookup or network request to the address itself is performed.
Frequently Asked Questions
Does a Valid result mean the IP address is online or reachable?
No. The tool only checks that the address is correctly formatted as IPv4 or IPv6. It does not ping the address, contact any server, or verify that the IP is assigned, routable, or live. A Valid result simply means the syntax is correct.
Why does a private address like 192.168.1.1 show as Valid?
Because it is a correctly formatted IPv4 address. The validator checks format against IPv4 and IPv6 rules but does not exclude private, reserved, or loopback ranges, so addresses such as 192.168.1.1, 10.0.0.0, and 127.0.0.1 all return Valid.
Can I validate an IP range or an address with a port?
No. The tool validates a single bare IP address only. Inputs like a CIDR range (192.168.1.0/24) or an address with a port appended (8.8.8.8:53) are not plain IP addresses, so they are reported as Invalid.
How does the tool decide between IPv4 and IPv6?
It tests your input against IPv4 format rules and IPv6 format rules separately. If it matches IPv4 it reports IPv4, if it matches IPv6 it reports IPv6, and if it matches neither the Type is shown as Invalid alongside an Invalid status.
Is the address checked in my browser or on the server?
On the server. When you click Validate, the address is submitted via a form POST and the format check runs server-side, then the result is returned to your page. No external lookup or network request to the address itself is performed.
Last reviewed:
How this tool works: This tool runs in your browser and on our server in real time. Depending on the tool, results are computed directly from the input you provide or retrieved from live, authoritative data sources at the moment you run a lookup. We do not sell your data, and your lookups are kept private — any history shown here is stored only on your device.