ZIP code targeting is a proxy geo-targeting option that requests an exit IP geolocated to a specific US ZIP code or, where supported, another country's postal code. Where it is offered, the ZIP code is passed as a parameter alongside a country code, for example in the proxy username. The match comes from an IP geolocation database, so it reflects an estimated location, not a verified street address.

ZIP stands for Zone Improvement Plan. The US Postal Service introduced the five-digit ZIP Code in 1963 and added ZIP+4 in 1983.

How ZIP Code Targeting Works

  • Parameter: The ZIP code is added to the proxy credentials, paired with the US country code.
  • Format: At least one provider's documentation supports only US five-digit ZIP codes.
  • Database match: The proxy's location is matched against a specific IP geolocation database, and other databases may place the same IP in a different ZIP code.
  • Availability: Support can vary by proxy type. One provider's documentation lists no ZIP targeting on its IPv6 options.

Accuracy Limits

  • ZIP codes are not fixed areas: They follow address groups and delivery routes, so ZIP areas can overlap or nest inside each other.
  • Geolocation is approximate: MaxMind states that IP geolocation is never precise enough to locate a specific household or street address, and it leaves out postal code data when it cannot pin a location down.
  • Shared addresses: A user behind carrier-grade NAT geolocates to wherever the NAT's address prefix appears to be, which can be far from the user.

Common Uses

Prices, stock levels, delivery times and search results can differ between nearby areas in the same country. ZIP code targeting shows a scraper the version served to one area. Documented uses include regional price checks, local ad verification, local SEO checks and market research.

Postal Codes Outside the US

Some proxy services accept other countries' postal codes under the same option. Each country keeps its own format: five digits in Germany and France, four in Australia, seven in Japan, and letters and numbers in the UK and Canada.