Which domain is used for a reverse lookup of IPv4 addresses?
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A. B. C. D.A.
The domain used for a reverse lookup of IPv4 addresses is A) in-addr.arpa.
DNS (Domain Name System) is used to resolve domain names to IP addresses and vice versa. A forward lookup maps a domain name to an IP address, while a reverse lookup maps an IP address to a domain name.
In the case of IPv4 addresses, a reverse lookup is performed by querying the in-addr.arpa domain. The in-addr.arpa domain is a special domain used exclusively for reverse lookups of IPv4 addresses. The domain name for a reverse lookup of an IPv4 address is created by reversing the octets of the address, separating them with dots, and appending ".in-addr.arpa" to the end.
For example, the reverse lookup domain name for the IPv4 address "192.0.2.1" would be "1.2.0.192.in-addr.arpa". This domain name can be queried to obtain the domain name associated with the IP address.
The other options listed, B) ip4.arpa, C) in-addr.net, and D) ip4.net, are not valid domains for reverse lookups of IPv4 addresses.