You can tune the request by providing geo parameters like an ISO ZIP code, subdivision, and country code, and by city. 
curl -x https://network.joinmassive.com:65535 \
     -U '{PROXY_USERNAME}-country-US-zipcode-10001:{API_KEY}' \
     https://cloudflare.com/cdn-cgi/trace

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Country, subdivision, city, zipcode

KeyValueExamples
countryA two-letter country code (these codes are case insensitive)US, GB
subdivisionThe alphanumeric second part (proceeding the separator) of a first-level subdivision code in the (prerequisite) country (case insensitive)CA, LND
cityA commonly spelled city name (temporarily case sensitive and inclusive of URL-encoded spaces and punctuation marks) in the (prerequisite) country. We always use the English (en) variant of the city name, which can be verified on GeoNames (as referenced in MaxMind’s documentation).New York, London
zipcodeA postal code. Please take a look at the limitations below.10001, OX2

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Geotargeting rules

  • country key must always persist if any of the geo parameters is specified. Otherwise, HTTP 400 is returned.
  • If more than one geo key is specified, the server finds an appropriate node strictly matching all the parameters. The only exception is zipcode: if specified, city key is ignored.
    • Details:
      • If both subdivision and zipcode are provided, the city is ignored.
      • If both zipcode and city are provided, the city is ignored.
      • If subdivision and city are provided, both are strictly matched.
Please, take into account, that due to technical reasons, the more strict geotargeting narrows the range of appropriate nodes.

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Zipcode Notes

For the following countries, we accept partial postal codes with the number of characters indicated below:
  • United States: 5
  • Canada: 3
  • United Kingdom: 2-4
  • Brazil: 5
  • Ireland: 3
  • Japan: 7 (specified for the first 6. The last digit defaults to 1)
  • Netherlands: 4
  • Portugal: 7 (accurate for the first 4. The last 3 often default to -001)
  • Singapore: 2
Geotargeting by country and city is always more robust than by ZIP code.

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Examples

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Country

curl -x https://network.joinmassive.com:65535 \
     -U '{PROXY_USERNAME}-country-US:{API_KEY}' \
     https://cloudflare.com/cdn-cgi/trace

​
Country and city

curl -x https://network.joinmassive.com:65535 \
     -U '{PROXY_USERNAME}-country-US-city-New%20York:{API_KEY}' \
     https://cloudflare.com/cdn-cgi/trace

​
Country and subdivision

curl -x https://network.joinmassive.com:65535 \
     -U '{PROXY_USERNAME}-country-US-subdivision-NY:{API_KEY}' \
     https://cloudflare.com/cdn-cgi/trace

​
Country and zipcode

curl -x https://network.joinmassive.com:65535 \
     -U '{PROXY_USERNAME}-country-US-zipcode-10001:{API_KEY}' \
     https://cloudflare.com/cdn-cgi/trace