Question: Do you know of a service that provides detailed network information for individual IP addresses or CIDR ranges for network optimization?

For more in-depth network details, Shodan is a powerful search engine that can give you a more complete picture of what's exposed, and help you monitor network security and make business decisions. It crawls the entire internet every week and offers real-time monitoring, detailed IP information and a map view with geo-location data. This can be useful for monitoring network exposure and finding devices that are reachable from the internet.

Another service worth mentioning is BigDataCloud, which offers a range of APIs for IP geolocation, reverse geocoding, phone and email verification and network engineering. The APIs use proprietary algorithms for location data and can be used with a variety of pricing plans, including a free tier. This can be useful for businesses that need location and network data.

For IP address data and threat intelligence, Ipregistry offers data that can help businesses identify and profile users, block fraud and analyze logs. It includes data on more than 3 million locations, proxy and VPN detection, and can be integrated with refined JSON and XML APIs. This can be useful for publishers, ad networks and e-commerce sites.

If you're looking for a simple IP geolocation service, IP-API offers network details including ISP and ASN information, with a JSON API and HTTPS/SSL encryption. It can be used for geotargeting, content personalization and security, and works with many programming languages. This can help businesses personalize user experiences and improve security.