Free tool · converter
IP address converter
Convert an IP address into its numeric forms and IPv6 representations, or turn a number back into an IP address.
Enter an IPv4 or IPv6 address, or a decimal number. Runs in your browser.
Building this into an app? Use the IP lookup API and its IP info endpoint documentation.
Frequently asked questions
How do I convert an IPv4 address to a number?
Multiply the four octets by 256³, 256², 256 and 1 and add them up: 192.0.2.1 = 192×16,777,216 + 0×65,536 + 2×256 + 1 = 3221225985. Databases often store IPs this way for range queries.
How do I convert IPv4 to IPv6?
There is no one-to-one conversion, but an IPv4 address can be written as an IPv4-mapped IPv6 address (::ffff:192.0.2.1), which dual-stack software uses internally.
IP geolocation API
Get this data in your app
ipbase returns location, ISP, ASN and time zone for any IPv4 or IPv6 address, up to 1,000 addresses per POST request. Security flags (VPN, proxy, Tor, data center) are on the Small plan and above.
Read the documentation150 free requests every month. No credit card required.
GET https://api.ipbase.com/v2/info?ip=1.1.1.1
{
"data": {
"ip": "1.1.1.1",
"type": "v4",
"connection": {
"asn": 13335,
"organization": "APNIC and Cloudflare DNS Resolver project",
"isp": "Cloudflare, Inc",
"range": "1.1.1.0/24"
},
"location": {
"country": { "alpha2": "AU", "name": "Australia" },
"zip": "4000"
},
"security": { "is_vpn": null, "is_tor": null, "threat_score": null }
}
}Free IP tools
ASN lookup
Owner and prefixes of any AS number.
Bulk IP lookup
Up to 100 IPs at once, CSV export.
IP address lookup
Location and owner of any IP.
IP range to CIDR converter
Ranges to CIDR blocks and back.
Reverse IP lookup
Domains hosted on any IPv4 address.
Subnet calculator
CIDR, netmask and host range.
VPN and proxy checker
VPN, proxy and Tor flags of any IP.
What is my IP address?
Your public IP, location and provider.
What is my ISP?
Which internet provider you use.
Cloud & bot IP rangesOfficial lists of AWS, Googlebot, GPTBot and more.
Example lookups: 8.8.8.8 · 8.8.8.0/24 · AS15169 · example.com · all IPv4 ranges