Apparatus

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sensors Mode-S transponder

A4101F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N361BC · BEECH 36 Bonanza · operated by GTA AIR INC

Hex
A4101F
Octal
51010037
Decimal
10,752,031
Country
US
Tail
N361BC
Type
BE36
No current signal · last broadcast 3d ago
Flights observed
107
Distinct callsigns
18
Country
US
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S A4101F.

Country allocation

The ICAO 24-bit address A4101F 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 18 distinct

Callsign Airline Flights Last seen
GTX321 - 21 2026-06-30
GTX322 - 20 2026-06-30
GTX502 - 12 2026-07-08
GTX948 - 7 2026-07-10
GTX511 - 7 2026-04-18
GTX506 - 6 2026-06-22
GTX509 - 5 2026-06-24
GTX504 - 4 2026-06-29
GTX323 - 4 2026-06-30
GTX701 - 3 2026-07-14
GTX507 - 3 2026-06-12
GTX248 - 3 2026-07-02
GTX922 - 2 2026-05-05
GTX901 - 2 2026-04-19
GTX800 - 2 2026-06-25
GTX512 - 2 2026-07-09
GTX505 - 2 2026-05-10
GTX501 - 2 2026-07-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 GTX701 ADS → ADS Jul 14, 20:35 UTCJul 14, 22:15 UTC1h 40m
2026-07-14 GTX701 - Jul 14, 16:40 UTCJul 14, 18:20 UTC1h 40m
2026-07-13 GTX701 - Jul 13, 18:00 UTCJul 13, 19:40 UTC1h 40m
2026-07-10 GTX948 - Jul 10, 02:40 UTCJul 10, 04:05 UTC1h 25m
2026-07-10 GTX948 - Jul 10, 00:10 UTCJul 10, 00:50 UTC40m
2026-07-09 GTX512 - Jul 9, 03:55 UTCJul 9, 07:50 UTC3h 55m
2026-07-08 GTX512 - Jul 8, 23:30 UTCJul 9, 02:35 UTC3h 5m
2026-07-08 GTX502 TEB → IAD Jul 8, 05:20 UTCJul 8, 06:45 UTC1h 25m
2026-07-07 GTX502 ROC → TEB Jul 7, 06:20 UTCJul 7, 07:50 UTC1h 30m
2026-07-07 GTX502 - Jul 7, 03:10 UTCJul 7, 04:40 UTC1h 30m
2026-07-06 GTX501 ROC → TEB Jul 6, 06:30 UTCJul 6, 08:00 UTC1h 30m
2026-07-06 GTX501 IAD → ROC Jul 6, 04:00 UTCJul 6, 05:35 UTC1h 35m
2026-07-02 GTX248 - Jul 2, 04:40 UTCJul 2, 07:50 UTC3h 10m
2026-07-01 GTX248 - Jul 1, 04:20 UTCJul 1, 07:30 UTC3h 10m
2026-06-30 GTX323 FRG → IAD Jun 30, 09:25 UTCJun 30, 11:05 UTC1h 40m
2026-06-30 GTX322 - Jun 30, 05:20 UTCJun 30, 08:00 UTC2h 40m
2026-06-30 GTX321 - Jun 30, 01:09 UTCJun 30, 02:55 UTC1h 46m
2026-06-29 GTX504 - Jun 29, 16:29 UTCJun 29, 18:10 UTC1h 40m
2026-06-29 GTX504 - Jun 29, 15:14 UTCJun 29, 15:34 UTC20m
2026-06-29 GTX504 - Jun 29, 14:14 UTCJun 29, 14:34 UTC20m
2026-06-29 GTX504 IAD → MMU Jun 29, 11:14 UTCJun 29, 12:39 UTC1h 25m
2026-06-28 GTX322 - Jun 28, 03:00 UTCJun 28, 07:25 UTC4h 25m
2026-06-27 GTX321 - Jun 27, 23:25 UTCJun 28, 01:15 UTC1h 50m
2026-06-27 GTX322 - Jun 27, 05:15 UTCJun 27, 09:44 UTC4h 30m
2026-06-27 GTX321 IAD → CMH Jun 27, 01:04 UTCJun 27, 02:59 UTC1h 55m
2026-06-26 GTX248 - Jun 26, 08:54 UTCJun 26, 10:30 UTC1h 35m
2026-06-26 GTX322 - Jun 26, 06:39 UTCJun 26, 08:15 UTC1h 35m
2026-06-26 GTX322 - Jun 26, 05:30 UTCJun 26, 06:09 UTC40m
2026-06-25 GTX800 - Jun 25, 17:54 UTCJun 25, 22:29 UTC4h 35m
2026-06-24 GTX509 - Jun 24, 00:20 UTCJun 24, 04:44 UTC4h 25m
2026-06-23 GTX509 - Jun 23, 22:25 UTCJun 23, 23:19 UTC55m
2026-06-23 GTX509 - Jun 23, 20:29 UTCJun 23, 21:20 UTC50m
2026-06-22 GTX506 - Jun 22, 23:55 UTCJun 23, 00:35 UTC40m
2026-06-22 GTX506 - Jun 22, 21:59 UTCJun 22, 23:20 UTC1h 20m
2026-06-22 GTX506 - Jun 22, 18:19 UTCJun 22, 19:29 UTC1h 10m
2026-06-20 GTX321 IAD → CMH Jun 20, 23:25 UTCJun 21, 01:19 UTC1h 55m
2026-06-20 GTX322 - Jun 20, 05:09 UTCJun 20, 09:29 UTC4h 20m
2026-06-20 GTX321 - Jun 20, 02:09 UTCJun 20, 03:04 UTC55m
2026-06-20 GTX321 - Jun 20, 01:05 UTCJun 20, 01:39 UTC35m
2026-06-19 GTX322 - Jun 19, 05:19 UTCJun 19, 09:44 UTC4h 25m
2026-06-19 GTX321 - Jun 19, 01:04 UTCJun 19, 03:05 UTC2h 0m
2026-06-18 GTX322 - Jun 18, 05:05 UTCJun 18, 09:35 UTC4h 30m
2026-06-18 GTX321 - Jun 18, 00:05 UTCJun 18, 01:55 UTC1h 50m
2026-06-17 GTX323 - Jun 17, 08:25 UTCJun 17, 09:55 UTC1h 30m
2026-06-17 GTX322 - Jun 17, 05:15 UTCJun 17, 07:45 UTC2h 30m
2026-06-17 GTX321 - Jun 17, 01:50 UTCJun 17, 03:15 UTC1h 25m
2026-06-16 GTX502 - Jun 16, 13:34 UTCJun 16, 14:05 UTC30m
2026-06-16 GTX502 MDW → LUK Jun 16, 11:00 UTCJun 16, 12:30 UTC1h 30m
2026-06-12 GTX507 UES → MDW Jun 12, 23:00 UTCJun 12, 23:55 UTC55m
2026-06-12 GTX507 OMA → UES Jun 12, 08:15 UTCJun 12, 10:20 UTC2h 5m

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 N361BC page for operator, model, and routing details .

Mode-S A4101F frequently asked

What is Mode-S code A4101F?
A4101F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N361BC.
Where is Mode-S A4101F registered?
Mode-S code A4101F 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 A4101F broadcasting right now?
No active broadcast right now. Last signal was 3d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4101F, octal 51010037, decimal 10,752,031.
What flights does A4101F operate?
Mode-S A4101F has broadcast 18 distinct callsigns, including GTX321, GTX322, GTX502, GTX948, GTX511.