NIST SP 800-171 Rev 3 covers 34% of NIST SP 800-53 Rev 5
102 of the 300 controls in NIST SP 800-53 Rev 5 are already satisfied by evidence you collected for NIST SP 800-171 Rev 3. 198 are genuine gaps. Every claim below was judged against both control sets and then argued against; the ones that did not survive are published further down with the reason each failed.
What this leaves you to do
NIST SP 800-53 Rev 5 has 300 controls. Holding NIST SP 800-171 Rev 3 already evidences 102 of them, so the work in front of you is 198 controls, not 300, which is 66% of the standard rather than all of it.
That is the whole claim. Every number in that sentence comes from the two counts above it and can be re-derived from the free tools without taking our word for any of it.
In money, using only our numbers. The full report is $299 and names 102 controls of NIST SP 800-53 Rev 5 you do not have to implement again, which is $2.93 per control identified. That arithmetic uses our price and our count and assumes nothing about you.
In your hours, using your assumption. We do not know what a control costs you to implement, so pick the column that looks like your organisation. These are your figures, not our claim.
| If a control takes you | 4 hours | 8 hours | 16 hours |
|---|---|---|---|
| the 102 already evidenced are | 408 hours | 816 hours | 1,632 hours |
| and the 198 remaining are | 792 hours | 1,584 hours | 3,168 hours |
Multiply by your own rate. We publish no rate because we have not measured yours, and a number built on an invented rate is the kind of claim this platform exists to argue against.
This number is directional. It says how much of NIST SP 800-53 Rev 5 your NIST SP 800-171 Rev 3 evidence satisfies. The reverse pair is a different number, often very different, because a security standard has enormous depth for access control and almost none for lawful basis or data subject rights.
141 candidate mappings were examined and 0 were removed. Signed off 2026-08-19, review level machine verified. Mappings were judged by Claude Code rather than read line by line by a practitioner. Every claim shows its reasoning so you can check it. Ask and a practitioner will review this pair. This pair was signed off, then RETRACTED by its own builder on discovering that half of NIST SP 800-53 Rev 5 carried label-only descriptions, and restored 2026-08-19 after that framework was rebuilt from the OSCAL catalogue. The mappings are unchanged and were never re-judged, because the judgement was sound; only the target text was thin.
Where the gaps are
Coverage is never evenly spread. A source standard usually satisfies one part of a target almost completely and barely touches another, and which part is which is the thing worth knowing before you plan the work.
Theme level, not control level, deliberately. The per-control list of what is evidenced and what is a gap is the report itself, so publishing it here would be publishing the thing being sold.
Claims that held
A sample. Each one names the control whose evidence does the work, the control it satisfies, and why.
Policy and procedures required for each security requirement family including access control.
Device lock on inactivity with re authentication to unlock is the same control.
Automatic session termination on defined conditions is the same control.
Remote access usage restrictions, authorization and managed access control points are the same.
Wireless usage restrictions, authorization, authentication and encryption are the same.
Mobile device configuration and connection requirements with CUI encryption are the same.
Account management defining, establishing, modifying and disabling accounts is the same control.
Terms and conditions for external system use with storage device restrictions are the same.
Claims that did not hold
Nothing proposed for this pair was rejected in review. That is unusual and worth knowing rather than hiding: it means the candidate set was small and every candidate held.
The full report
Everything above is a sample. The report is every evidenced control and every gap, with the reasoning and the source document behind each one, in a form you can hand to an assessor. $299, emailed immediately.
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