When to use it
Inspect the hreflang declarations visible on one page.
Crawl & indexing
Hreflang Checker
Fetch a page and list declared hreflang alternates and resolved target URLs.
Uses a protected server check
Run the tool
Only public web targets are accepted. Private and reserved network ranges are blocked.
What this check means
This checks declarations on the inspected page; reciprocal validation across an entire site is outside this first bounded version.