Apparatus

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sensors Mode-S transponder

A98AC7

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N7139B · PIPER PA-42-720 Cheyenne 3 · operated by NORTHEAST TRAVEL CORP

Hex
A98AC7
Octal
52305307
Decimal
11,111,111
Country
US
Tail
N7139B
Type
PAY3
No current signal · last broadcast 1d ago
Flights observed
25
Distinct callsigns
2
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A98AC7.

Country allocation

The ICAO 24-bit address A98AC7 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 2 distinct

Callsign Airline Flights Last seen
UNIDENT - 22 2026-07-12
N7139B - 3 2026-07-04

Recent flights last 25

DateFlightRouteTakeoffLandingDuration
2026-07-12 UNIDENT - Jul 12, 03:35 UTCJul 12, 21:10 UTC17h 35m
2026-07-09 UNIDENT - Jul 9, 06:10 UTCJul 9, 14:50 UTC8h 40m
2026-07-06 UNIDENT - Jul 6, 23:05 UTCJul 6, 23:40 UTC35m
2026-07-04 UNIDENT - Jul 4, 19:10 UTCJul 5, 04:10 UTC9h 0m
2026-07-04 N7139B - Jul 4, 15:40 UTCJul 4, 16:00 UTC20m
2026-07-02 UNIDENT - Jul 2, 18:20 UTCJul 3, 03:05 UTC8h 45m
2026-06-30 UNIDENT - Jun 30, 01:55 UTCJun 30, 19:05 UTC17h 10m
2026-06-27 UNIDENT - Jun 27, 18:35 UTCJun 28, 08:14 UTC13h 40m
2026-06-24 UNIDENT - Jun 24, 06:59 UTCJun 24, 18:29 UTC11h 30m
2026-06-22 UNIDENT - Jun 22, 04:04 UTCJun 22, 04:09 UTC5m
2026-06-22 UNIDENT - Jun 22, 03:30 UTCJun 22, 03:45 UTC15m
2026-06-22 UNIDENT - Jun 22, 02:59 UTCJun 22, 03:05 UTC5m
2026-06-22 UNIDENT - Jun 22, 02:25 UTCJun 22, 02:34 UTC10m
2026-06-22 UNIDENT - Jun 22, 01:35 UTCJun 22, 01:40 UTC5m
2026-06-22 UNIDENT - Jun 22, 01:10 UTCJun 22, 01:19 UTC10m
2026-06-22 UNIDENT - Jun 22, 00:24 UTCJun 22, 00:34 UTC10m
2026-06-21 UNIDENT - Jun 21, 23:10 UTCJun 21, 23:24 UTC15m
2026-06-21 UNIDENT - Jun 21, 22:10 UTCJun 21, 22:15 UTC5m
2026-06-15 UNIDENT - Jun 15, 17:40 UTCJun 16, 05:05 UTC11h 25m
2026-06-04 UNIDENT - Jun 4, 00:05 UTCJun 4, 16:10 UTC16h 5m
2026-05-29 UNIDENT - May 29, 01:40 UTCMay 29, 16:45 UTC15h 5m
2026-05-27 UNIDENT - May 27, 06:49 UTCMay 27, 08:20 UTC1h 31m
2026-05-17 N7139B - May 17, 20:55 UTCMay 17, 21:10 UTC15m
2026-05-17 N7139B - May 17, 17:35 UTCMay 17, 17:45 UTC10m
2026-05-16 UNIDENT - May 16, 18:00 UTCMay 16, 22:10 UTC4h 10m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N7139B page for operator, model, and routing details .

Mode-S A98AC7 frequently asked

What is Mode-S code A98AC7?
A98AC7 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N7139B.
Where is Mode-S A98AC7 registered?
Mode-S code A98AC7 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A98AC7 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A98AC7, octal 52305307, decimal 11,111,111.
What flights does A98AC7 operate?
Mode-S A98AC7 has broadcast 2 distinct callsigns, including UNIDENT, N7139B.