# Flags Contract Registry Source: https://docs.chain.link/data-feeds/contract-registry > For the complete documentation index, see [llms.txt](/llms.txt). The Chainlink Flags Contract Registry provides a reliable, onchain source of truth for all active Chainlink price feed proxy contracts across supported networks. It serves as a central reference point for identifying which data feeds are **owned and operated by Chainlink**, verifying the authenticity of the feeds your applications rely on. A proxy address that returns `true` when checked against this registry indicates two things: 1. The data feed is officially owned and operated by Chainlink 2. The feed is currently active Inactive feeds are removed from the registry to ensure accuracy. The list is actively maintained as new feeds are deployed, making it a trusted resource for keeping up with the evolving state of Chainlink's oracle infrastructure. ## Querying Flags Onchain To check if a proxy address is flagged (owned by Chainlink and active) in your Solidity code, you can call the `getFlag` function on the `Flags` contract deployed on the corresponding network: ```solidity interface IFlags { function getFlag(address) external view returns (bool); } contract Example { IFlags public flags; // Initialize with the correct Flags contract address for your network constructor(address flagsContractAddress) { flags = IFlags(flagsContractAddress); } function isOfficialChainlinkFeed(address proxy) public view returns (bool) { return flags.getFlag(proxy); } } ``` ## Flags Contract Addresses Below is a list of all available Flags contracts on the supported networks: | | Chain | ChainFlag Contract Address | | -------------------------------------------------------------------------------------------------------- | ------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------- | |