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LPI 010-160 Exam - Topic 4 Question 64 Discussion

Actual exam question for LPI's 010-160 exam
Question #: 64
Topic #: 4
[All 010-160 Questions]

Reverse DNS assigns hostnames to IP addresses. How is the name of the IP address 198.51.100.165 stored

on a DNS server?

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Suggested Answer: B

Reverse DNS lookups query DNS servers for a PTR (pointer) record; if the server does not have a PTR record, it cannot resolve a reverse lookup. PTR records store IP addresses with their segments reversed, and they append ''.in-addr.arpa'' to that. For example, if a domain has an IP address of 192.0.2.1, the PTR record will store the domain's information under 1.2.0.192.in-addr.arpa.In IPv6, the latest version of the Internet Protocol, PTR records are stored within the ''.ip6.arpa'' domain instead of '.in-addr.arpa.'1Therefore, the name of the IP address 198.51.100.165 is stored in the PTR record for 165.100.51.198.in-addr.arpa.Reference:1: Reverse DNS lookup - Wikipedia1


by Tamar at Apr 07, 2026, 02:28 PM

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Patti
2 days ago
I remember something about PTR records being used for reverse DNS lookups, but I'm not sure about the exact format.
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