Limits RegistryPUBLIC RECORDLimits RegistryResearch Console →TCP acknowledgment-number field width is 32 bits under the RFC 9293 TCP header.
The question, scope, and sources behind this Registry record.
Under the RFC 9293 TCP header, what exact standards-defined value applies to Acknowledgment Number field width?
Current frontiers derived from accepted Claims.
The accepted equality closes this optimization result.
Assertions tied to evidence, attribution, and review.
The frontier as it changed over time.
Only accepted Claims matching the current specification contribute to the displayed bounds. Strict inequalities remain open; contradictory Claims require editorial review.