Get XML and JSON results of websites that are using specific IP addresses, Google Analytics Tags and more.
The general access method is as follows -
You must provide your API key in each lookup. See the examples for how this works.
Login or Create a Free Account to get your API key.
Get Tag Example
XML Get Single Domain
JSON Get Single Domain
The following GET parameters can be supplied for lookups
Sign up for Free or Login to get a key.
Attributes that you'd like to lookup - the list of attribute types is available at https://api.builtwith.com/tag1/api.xml?TYPES=true (json)
You can lookup 16 attributes at a time - seperate them with a comma. For example IP-126.96.36.199,CA-PUB-1894893914772263 - this dramatically improves throughput.
The Tags API will respond with a document in the format -
Identifier is the sub-option in the identifers array.
||The tag that was looked up.
||Identifier explained below
Matches are other domains that have this identifier.
||The domain name of the match
||The date we first detected this tag
||The date we last detected this tag
JSON/XML have integrations in all modern programming languages. Here's some StackOverflow topics for various languages - Python, C#, Java, PHP, C++, TSQL and Ruby.
Note error messages in this format cannot be guaranteed, your implementation should also consider non-200 response codes as errors. The Lookup property will be null (json) or not provided (xml) if the error is server related. View all potential well-formed error codes.
Our standard terms cover the use all of our APIs.
In general, you can use the API to enhance your product in many ways. The only limitation is you cannot resell the data as-is or provide duplicate functionality to builtwith.com and its associated services.