in-addr.arpa is a special domain designed for the reverse delegation of IP addresses.
IP address is a unique numerical identifier for a device connected to the Internet.
IPv4 (Internet Protocol version 4) — IPv4 uses 32-bit addresses with a total of 232 (4,294,967,296). IPv4 addresses are usually written in decimal form with dots. Example: 127.0.0.1.
IPv6 (Internet Protocol version 6) — IPv6 uses 128-bit addresses with a total of 2128. IPv6 addresses are normally written in hexadecimal with colons. Example: 2a00:f70:abcd:102:0:1339:bad4:68c.
Whois is a software system for searching the RIPE database or other databases.
Autonomous System (AS) is a set of IP networks with a single well-defined routing policy, managed by one or more network operators.
RIPE Database (RIPE DB) is structured data from the RIPE Internet Numbering Register, published in the public domain.
Domain name is a unique name that identifies an Internet resource.
Autonomous System Number (AS Number) is a unique Autonomous System number between 0 and 4,294,967,295.
Numbered Internet resources are the global space of IP addresses (IPv4 and IPv6) and autonomous system numbers.
Reverse delegation is the binding of a domain name to an IP address.
RIPE database object is a record in the RIPE database containing information about an Internet resource or associated administrative data.
Prefix is a pattern denoting the first N bits of the IP address. N number is called the prefix of the IP address (another name is the mask).
RIPE Internet Numbering Registry is a registry operated by the RIPE NCC containing information on the allocation of Internet numbering resources.
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