IP Tools (Ipaddress.to)
Clean IP lookup interface, but ipinfo.io and similar tools already dominate this space.

Yet another IP lookup extension, but right-click context menu is handy.
Security researchers and sysadmins doing quick IP lookups
WhoisXML API · DomainTools · IPinfo
Hope it helps out other devs as much as it helps me on a daily basis:
https://chromewebstore.google.com/detail/ipaddressto-lookup/...
https://addons.mozilla.org/en-US/firefox/addon/ipaddress-to-...
The extension uses https://ipaddress.to
Clean IP lookup interface, but ipinfo.io and similar tools already dominate this space.
SPF flattening via recursive DNS, solves real 10-lookup limit, but audience is narrow sysadmins-only.
Finally exposes the messy reality of local government DNS admin contacts.
Fixes WHOIS's broken successor: one endpoint, consistent schema, handles multi-server routing automatically.
DNS lookup behind a CAPTCHA is ironic for a reconnaissance tool.
Free fraud scoring API beats expensive competitors for small-scale bot blocking.