Alpaca is a free Chrome add-on developed by Ross Jacobs. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. This handy tool highlights URLs on webpages based on their DNS status, making it easier to identify important information.

With Alpaca, URLs that are being proxied over Cloudflare are highlighted in orange, while URLs that are not being proxied over Cloudflare are highlighted in blue. This allows users to quickly differentiate between these two types of URLs. Additionally, if there is an NXDOMAIN error, the URL will be highlighted in red. This is particularly useful for identifying inaccessible domains.

One of the standout features of Alpaca is the ability to hover over a highlighted URL and instantly view its IPv4 addresses. This provides users with valuable information about the IP addresses associated with a particular domain, allowing for further investigation or troubleshooting if needed.

Overall, Alpaca is a useful Chrome add-on for anyone who wants to easily highlight and gather information about IPs and domains. Its intuitive interface and valuable features make it a valuable tool for both casual users and professionals.