NOTAM number lookup

How NOTAM numbers are structured

A typical NOTAM identifier combines a series letter, a sequential number, and a year suffix — for example A2473/24. The series reflects issuing office or category conventions in the originating state. The number is unique within that series for the year. Investigators often encounter NOTAM numbers in crew statements, dispatch releases, or radar data annotations.

Understanding structure helps you enter the identifier correctly in the optional NOTAM number field on the NOTAM History search form. For field-level background, see ICAO NOTAM format.

How to search by NOTAM number

Enter the 4-letter ICAO aerodrome or FIR code, the validity date (up to approximately two years back), and the NOTAM number in the optional field. The archive returns matching notices active on that date at that location.

All three inputs matter. A NOTAM number alone is insufficient because identifiers repeat across locations and years in different contexts. ICAO and date anchor the search to the correct snapshot of the active set.

Typical professional use cases

When you need the full active set rather than one notice, omit the NOTAM number and retrieve all archived NOTAMs for the ICAO location and date. See NOTAM history lookup for the general workflow.

• Verify a specific closure or restriction cited in an incident report
• Confirm whether a NOTAM referenced in legal pleadings existed on the operative date
• Cross-check dispatch documentation that lists individual NOTAM identifiers
• Isolate one notice within a large FIR snapshot for insurance or audit files

Delivery and pricing

Results arrive by email within seconds in ICAO plain-text format. NOTAM History uses archive APIs; it is for documentation and analysis, not pre-flight briefing. FAA NOTAM Search remains appropriate for current US NOTAMs before flight.

Pricing: €9.99 one-off search, €29.99/year subscription with ten searches, €29.99 top-up packs. Logged-in users retain search history in My account. For broader context, see historical NOTAMs.

When the NOTAM number is partial or uncertain

Crew notes may cite an incomplete NOTAM reference. When uncertain, retrieve the full active set for ICAO and date without the optional filter, then search within the emailed text locally.

Duplicate numbering conventions across different ICAO locations are why location and date remain mandatory even when the number is known.

Document the filter used in your case file. If a filtered search returns no result while the full set contains the notice under a corrected identifier, note the correction chain for transparency.

Professional use summary

NOTAM History delivers archived NOTAMs by ICAO aerodrome or FIR and historical validity date, with approximately two years of archive depth via professional aviation data APIs. Pricing: €9.99 one-off, €29.99/year (ten searches), €29.99 top-up. Email output uses ICAO plain-text format for investigators, lawyers, insurers, safety officers, and operators. Not for pre-flight briefing — use FAA NOTAM Search or approved operator systems for current US and international operations before flight.

NOTAM History queries professional archive APIs by 4-letter ICAO aerodrome or FIR code and historical validity date, returning ICAO plain-text NOTAM output by email within seconds. Archive depth is approximately two years where supported. Pricing is €9.99 per one-off search, €29.99 per year including ten searches, or €29.99 top-up packs. The service is designed for investigators, aviation lawyers, insurers, safety officers, and operators who need expired NOTAMs no longer shown on FAA NOTAM Search or briefing apps — and is not for pre-flight operational briefing.