Use ipinfo.io to see location and owner data for IP addresses, really useful in enriching data you get while investigating incidents. This one is freemium--you get basic stuff free/anon, signing up gets you a few more fields and API access, and paid plans gets bulk API use.

Trusted IP Data Provider, from IPv6 to IPv4

Get accurate IP address information with IPinfo. Trusted by 400,000+ users, we handle more than 40 billion API requests monthly. Sign up for free account today.

Use radar.cloudflare.com for a dashboard of tools that includes several useful lookups. Try them all, but my go-to is the URL Scanner that gives a detailed report breaking down security and tech characteristics of a target you're studying.

Worldwide Insights | Cloudflare Radar

Up to date global Internet trends and insights.