Free API

IP Lookup API

A simple, free, no-auth REST API to look up IP addresses. Returns the caller's IP along with hostname, location, and ISP data. No API key required.

Base URL

https://freeiptools.com

GET /api/ip

Returns the requester's IP address along with hostname, geolocation, and ISP information. No parameters required — simply make a GET request and the response reflects the calling client.

Request

curl https://freeiptools.com/api/ip

Response

{
  "ip":       "203.0.113.42",
  "hostname": "pool-203-0-113-42.example.net",
  "city":     "San Francisco",
  "region":   "California",
  "country":  "United States",
  "isp":      "Comcast Cable"
}

Response Fields

Field	Type	Description
ip	string	The caller's public IP address (IPv4 or IPv6)
hostname	string	Reverse DNS hostname (falls back to IP if not found)
city	string	City associated with the IP
region	string	Region or state associated with the IP
country	string	Country name
isp	string	Internet Service Provider name

Code Examples

JavaScript (fetch)

fetch('https://freeiptools.com/api/ip')
  .then(res => res.json())
  .then(data => console.log(data.ip));

Python

import requests
data = requests.get('https://freeiptools.com/api/ip').json()
print(data['ip'])

curl

curl https://freeiptools.com/api/ip
# Just the IP:
curl -s https://freeiptools.com/api/ip | python3 -c "import sys,json; print(json.load(sys.stdin)['ip'])"

PHP

$data = json_decode(file_get_contents('https://freeiptools.com/api/ip'), true);
echo $data['ip'];

Notes

• No API key or account required — completely free to use.
• The API always reflects the IP of the requesting client. To look up a different IP, use a server-side request from that machine.
• CORS is enabled — you can call this API directly from browser JavaScript.
• Geo data (city, region, country, ISP) may be empty for private or reserved IP ranges.