BTC can be replaced with almost any crypto currency symbol. Data is provided by CryptoCompare.com .

Returns geo-location and ASN/Organisation information related to an IP address.

Returns detailed information about virtually any URL. Supports extracting data from oEmbed, TwitterCards, OpenGraph, LinkPulse, Sailthru Meta-data, HTML and Dublin Core.

Returns information about the person/machine making the request.

Returns whois and DNS information for a given domain.

Returns various hash values for a given string.

Returns information about the current UTC date and time.

Returns useful and up-to-date links for programming languages.

Returns useful information about a given country.

Returns all possible query types and example queries.

FAQ

Why?

cli.fyi's goal is to create a quick an easy way to fetch information about IPs, emails, domains etc. directly from the command line.

Colourised Output?

Unfortunately Curl currently doesn't support colourised output1. HTTPie is a good alternative which does support colour output.

The JSON-Formatter Chrome extension is a good solution for in-browser JSON formatting.

Rate Limits?

There are no rate limits, however we will block any IP which is abusing the service. If you need to make a significant number of requests you can always host your own version.

Who?

cli.fyi is developed by Dave Earley

1 To the best of my knowledge, please correct me if I'm wrong.