Features:

• ipv4 allocation table
• some registration data of all assigned and allocated blocks
• AS information and announced own prefixes
• geolocation data for ipv4 addresses
• all domains for ip address

Limitations:

• 500 requests from registered users within 24 hours.
• 200 requests from one ip address within 24 hours for unregistered users.

Data sources:

• registered blocks: regional registers: RIPE NCC, ARIN, APNIC, LACNIC, AFRINIC
• BGP table: Route Views Project
• Geolocation data: NetLoad, MAXMIND, IpGeoBase.ru, local additions. This site or product includes IP2Location LITE data available from http://lite.ip2location.com.
• Icons: Fugue Icons
• Flags: flags.blogpotato.de and Maxmind
• Social icons: komodomedia