Non-Standard Large TTLs in DNS Query Responses

The DNS RFC defines a maximal TTL as MaxInt, namely 231 - 1, which affects the design of systems and repositories for DNS results. We show that there are cases where resolvers answer with larger values, up to 232 - 1, which may translate to negative numbers if the repository is using the standard singed integer representation, or crash a system.

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Publication Details

Published
2025-07-14
DOI
https://doi.org/10.1145/3744200.3744777
Primary Topic
Network Security and Intrusion Detection
Type
article
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article

Non-Standard Large TTLs in DNS Query Responses

Yuval Shavitt, Omer Shreibstein
Network Security and Intrusion Detection
article

Non-Standard Large TTLs in DNS Query Responses

Yuval Shavitt, Omer Shreibstein
article en

Abstract

The DNS RFC defines a maximal TTL as MaxInt, namely 231 - 1, which affects the design of systems and repositories for DNS results. We show that there are cases where resolvers answer with larger values, up to 232 - 1, which may translate to negative numbers if the repository is using the standard singed integer representation, or crash a system.

Arotech (Israel) (IL)
Openalex Percentile: Top 81%
Network Security and Intrusion Detection
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Non-Standard Large TTLs in DNS Query Responses — Yuval Shavitt, Omer Shreibstein · (2025) | TGRS Research Map | TGRS