Glossary

 IANA
Internet Assigned Numbers Authority
 in-addr.arpa
A special domain name used to achieve reverse delegation for IPv4 addresses.
 INET(6)NUM
A common abbreviation meaning both INETNUM and INET6NUM objects.
 Internet Number Registry (INR)
A registry that allocates Internet number resources and holds and publishes details of Internet number resource information.
 Internet Number Resources
Globally unique address space (IPv4 and IPv6) and Autonomous System Numbers (ASNs) issued by any Internet Number Registry.
 Internet Protocol Version 4 (IPv4)
IPv4 uses 32-bit (four-byte) addresses, which gives a total pool of 4,294,967,296 (2^32) addresses. These addresses are normally represented in a dotted quad notation. An example of an IPv4 address is: 192.0.2.35.
 Internet Protocol Version 6 (IPv6)
IPv6 uses 128-bit addresses, which gives a total pool of 2^128 addresses. These addresses are normally represented as eight groups of four hexadecimal digits separated by colons. An example of an IPv6 address is: 2001:db8:cd0f:421d:2209:bc:80ba:2095.
 Internet Routing Registry (IRR)
A registry that holds and publishes details of Internet routing information.
 IP Address
A unique numerical address used to identify a particular piece of hardware connected to the Internet. An IP address services two principal functions: host or network interface identification and location addressing.
 ip6.arpa
A special domain name used to achieve reverse delegation for IPv6 addresses.