Apparatus

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sensors Mode-S transponder

A25188

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N249BA · BOEING 747-400LCF Dreamlifter · operated by BOEING AIRCRAFT HOLDING CO

Hex
A25188
Octal
50450610
Decimal
10,637,704
Country
US
Tail
N249BA
Type
BLCF
No current signal · last broadcast 4d ago
Flights observed
50
Distinct callsigns
14
Country
US
Last broadcast
4d ago

Last known position

Most recent position reported by Mode-S A25188.

Country allocation

The ICAO 24-bit address A25188 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 14 distinct

Callsign Airline Flights Last seen
GTI4531 - 12 2026-06-29
GTI4312 Atlas Air 9 2026-06-07
GTI4316 - 8 2026-06-27
GTI4546 - 4 2026-07-01
GTI4536 - 4 2026-06-24
GTI4431 - 4 2026-07-01
GTI4542 Atlas Air 2 2026-06-11
GTI9898 - 1 2026-04-23
GTI9754 - 1 2026-07-10
GTI840 - 1 2026-07-02
GTI4436 Atlas Air 1 2026-06-11
GTI4432 Atlas Air 1 2026-06-11
GTI4326 Atlas Air 1 2026-05-11
GTI4231 Atlas Air 1 2026-05-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-10 GTI9754 - Jul 10, 17:45 UTCJul 10, 19:00 UTC1h 15m
2026-07-02 GTI840 - Jul 2, 06:35 UTCJul 2, 07:45 UTC1h 10m
2026-07-01 GTI4431 - Jul 1, 23:45 UTCJul 2, 01:55 UTC2h 10m
2026-07-01 GTI4546 - Jul 1, 17:45 UTCJul 1, 19:55 UTC2h 10m
2026-06-29 GTI4531 - Jun 29, 20:09 UTCJun 30, 03:00 UTC6h 51m
2026-06-29 GTI4531 - Jun 29, 11:29 UTCJun 29, 17:55 UTC6h 25m
2026-06-27 GTI4316 - Jun 27, 16:10 UTCJun 27, 23:25 UTC7h 15m
2026-06-27 GTI4316 - Jun 27, 06:44 UTCJun 27, 13:40 UTC6h 55m
2026-06-24 GTI4536 - Jun 24, 12:50 UTCJun 24, 19:24 UTC6h 35m
2026-06-24 GTI4536 - Jun 24, 04:20 UTCJun 24, 10:55 UTC6h 35m
2026-06-23 GTI4316 - Jun 23, 17:04 UTCJun 23, 23:55 UTC6h 50m
2026-06-23 GTI4316 - Jun 23, 07:49 UTCJun 23, 14:49 UTC7h 0m
2026-06-17 GTI4536 - Jun 17, 13:45 UTCJun 17, 20:05 UTC6h 20m
2026-06-17 GTI4536 - Jun 17, 05:20 UTCJun 17, 11:50 UTC6h 30m
2026-06-16 GTI4316 PAE → NGO Jun 16, 17:49 UTCJun 17, 01:15 UTC7h 26m
2026-06-16 GTI4316 PAE → NGO Jun 16, 07:40 UTCJun 16, 14:55 UTC7h 15m
2026-06-13 GTI4431 IAB → CHS Jun 13, 02:50 UTCJun 13, 04:45 UTC1h 54m
2026-06-12 GTI4546 ANC → LAX Jun 12, 17:20 UTCJun 12, 19:50 UTC2h 30m
2026-06-11 GTI4432 PAE → CHS Jun 11, 20:35 UTCJun 12, 01:00 UTC4h 25m
2026-06-11 GTI4436 IAB → PAE Jun 11, 11:30 UTCJun 11, 15:10 UTC3h 40m
2026-06-11 GTI4542 ANC → LAX Jun 11, 04:50 UTCJun 11, 07:10 UTC2h 20m
2026-06-09 GTI4531 ANC → CHS Jun 9, 14:05 UTCJun 9, 21:10 UTC7h 5m
2026-06-09 GTI4531 ANC → CHS Jun 9, 04:15 UTCJun 9, 10:35 UTC6h 20m
2026-06-07 GTI4312 ANC → NGO Jun 7, 15:55 UTCJun 7, 23:00 UTC7h 5m
2026-06-07 GTI4312 ANC → NGO Jun 7, 06:45 UTCJun 7, 13:35 UTC6h 50m
2026-06-05 GTI4531 ANC → CHS Jun 5, 13:05 UTCJun 5, 20:00 UTC6h 55m
2026-06-05 GTI4531 ANC → CHS Jun 5, 04:20 UTCJun 5, 11:10 UTC6h 50m
2026-06-04 GTI4312 ANC → NGO Jun 4, 10:25 UTCJun 4, 17:15 UTC6h 50m
2026-06-03 GTI4312 ANC → NGO Jun 3, 06:55 UTCJun 3, 14:00 UTC7h 5m
2026-05-27 GTI4531 ANC → CHS May 27, 13:50 UTCMay 27, 20:25 UTC6h 35m
2026-05-27 GTI4531 ANC → CHS May 27, 04:34 UTCMay 27, 11:15 UTC6h 41m
2026-05-26 GTI4312 ANC → NGO May 26, 17:04 UTCMay 27, 00:14 UTC7h 10m
2026-05-26 GTI4312 ANC → NGO May 26, 06:49 UTCMay 26, 13:54 UTC7h 5m
2026-05-25 GTI4431 IAB → CHS May 25, 14:00 UTCMay 25, 16:05 UTC2h 5m
2026-05-25 GTI4546 ANC → LAX May 25, 08:35 UTCMay 25, 10:50 UTC2h 15m
2026-05-22 GTI4431 IAB → CHS May 22, 02:00 UTCMay 22, 04:05 UTC2h 5m
2026-05-21 GTI4546 ANC → LAX May 21, 20:30 UTCMay 21, 22:50 UTC2h 20m
2026-05-15 GTI4531 ANC → CHS May 15, 19:40 UTCMay 16, 02:25 UTC6h 45m
2026-05-15 GTI4531 ANC → CHS May 15, 10:20 UTCMay 15, 17:35 UTC7h 14m
2026-05-14 GTI4312 ANC → NGO May 14, 18:00 UTCMay 15, 00:35 UTC6h 35m
2026-05-14 GTI4312 ANC → NGO May 14, 08:35 UTCMay 14, 15:55 UTC7h 20m
2026-05-13 GTI4231 TAR → CHS May 13, 07:50 UTCMay 13, 18:30 UTC10h 40m
2026-05-11 GTI4326 CHS → TAR May 11, 02:00 UTCMay 11, 11:30 UTC9h 30m
2026-05-06 GTI4531 ANC → CHS May 6, 15:05 UTCMay 6, 21:20 UTC6h 15m
2026-05-06 GTI4531 ANC → CHS May 6, 06:20 UTCMay 6, 12:50 UTC6h 30m
2026-04-30 GTI4316 PAE → NGO Apr 30, 18:55 UTCMay 1, 02:25 UTC7h 30m
2026-04-30 GTI4316 PAE → NGO Apr 30, 08:45 UTCApr 30, 16:15 UTC7h 30m
2026-04-23 GTI9898 - Apr 23, 14:30 UTCApr 23, 15:10 UTC40m
2026-04-20 GTI4542 ANC → LAX Apr 20, 08:35 UTCApr 20, 09:20 UTC45m
2026-04-14 GTI4312 ANC → NGO Apr 14, 09:30 UTCApr 14, 10:55 UTC1h 25m

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 N249BA page for operator, model, and routing details .

Mode-S A25188 frequently asked

What is Mode-S code A25188?
A25188 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N249BA.
Where is Mode-S A25188 registered?
Mode-S code A25188 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 A25188 broadcasting right now?
No active broadcast right now. Last signal was 4d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A25188, octal 50450610, decimal 10,637,704.
What flights does A25188 operate?
Mode-S A25188 has broadcast 14 distinct callsigns, including GTI4531, GTI4312, GTI4316, GTI4546, GTI4536.