Host, protocol and port matter
robots.txt rules apply to the host, protocol and port where the file is served. A rule on one hostname does not automatically govern another.
Website + SEO
Read and test the site's robots.txt.
Fetch the root robots file, see declared sitemap URLs, and test whether a selected path is allowed for a chosen crawler token.
Result
robots.txt
Captured robots.txt
Disallow is not a noindex directive
Blocking crawling can prevent a crawler from seeing page-level indexing directives. Use the right control for the actual indexing goal.
Sitemap declarations are absolute URLs
Major crawlers support Sitemap fields in robots.txt. The declared location may be on another verified host.
Longest matching path wins
The path tester uses common Google-style longest-match behavior, including Allow winning equal-length ties. Other crawlers may support different extensions.