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LPI 010-160 Exam - Topic 4 Question 64 Discussion

Reverse DNS assigns hostnames to IP addresses. How is the name of the IP address 198.51.100.165 storedon a DNS server?
B) In the PTR record for 165.100.51.198.in-addr.arpA.
A) In the A record for 165.100.51.198.ipv4.arpA.
C) In the RNAME record for 198-51-100-165.rev.arpA.
D) In the ARPA record for 165.100.51.198.rev.
E) In the REV record for arpA.in-addr.198.51.100.165.

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?

Show Suggested Answer Hide Answer
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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Clare
No way, I thought it was in the REV record!
upvoted 0 times
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Franklyn
5 days ago
I thought it was in the A record, but I guess not.
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Fernanda
10 days ago
Wait, is that really how it works? Sounds complicated!
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Pilar
2 months ago
Totally agree, B is the correct answer!
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Bette
2 months ago
It's stored in the PTR record for 165.100.51.198.in-addr.arpA.
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Leah
3 months ago
I definitely remember that reverse DNS uses the in-addr.arpa domain, so I’m leaning towards option B as well, but I hope I’m not mixing it up with something else!
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Olive
3 months ago
I’m a bit confused about the order of the IP address in the options. I feel like I’ve seen similar formats, but I can’t recall which one is correct.
upvoted 0 times
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Karl
3 months ago
I think it might be option B, since it mentions PTR and the in-addr.arpa domain, which sounds familiar from our practice questions.
upvoted 0 times
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Patti
3 months ago
I remember something about PTR records being used for reverse DNS lookups, but I'm not sure about the exact format.
upvoted 0 times
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