Reverse Lookup of IPv4 Addresses: Domain for CCIE Security Exam | Cisco Provider

Reverse Lookup of IPv4 Addresses

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Which domain is used for a reverse lookup of IPv4 addresses?



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A. B. C. D.


The domain used for a reverse lookup of IPv4 addresses is A)

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 domain. The 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 "" to the end.

For example, the reverse lookup domain name for the IPv4 address "" would be "". This domain name can be queried to obtain the domain name associated with the IP address.

The other options listed, B), C), and D), are not valid domains for reverse lookups of IPv4 addresses.