Apparatus

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sensors Mode-S transponder

0D121B

ICAO 24-bit transponder address · allocated to Mexico

Currently assigned to XA-OTC · BOEING 737 MAX 8

Hex
0D121B
Octal
03211033
Decimal
856,603
Country
MX
Tail
XA-OTC
Type
B38M
Broadcasting now · callsign AMX436 · 6,975 ft
Flights observed
185
Distinct callsigns
20
Country
MX
Last broadcast
17m ago

Current position

0D121B is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 0D121B falls within the block assigned to Mexico (MX) by ICAO Annex 10, Volume III. Every aircraft registered in Mexico 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 20 distinct

Callsign Airline Flights Last seen
AMX481 Aeroméxico 8 2026-05-16
AMX186 Aeroméxico 8 2026-05-16
AMX645 Aeroméxico 7 2026-05-24
AMX195 Aeroméxico 7 2026-05-16
AMX644 Aeroméxico 6 2026-05-24
AMX609 Aeroméxico 6 2026-05-30
AMX484 Aeroméxico 6 2026-05-16
AMX405 Aeroméxico 6 2026-05-27
AMX404 Aeroméxico 6 2026-05-26
AMX436 Aeroméxico 5 2026-05-30
AMX702 Aeroméxico 4 2026-04-22
AMX608 Aeroméxico 4 2026-05-29
AMX435 Aeroméxico 4 2026-05-09
AMX171 Aeroméxico 4 2026-05-03
AMX101 Aeroméxico 4 2026-05-04
AMX835 Aeroméxico 3 2026-04-22
AMX705 Aeroméxico 3 2026-04-22
AMX615 Aeroméxico 3 2026-05-06
AMX614 Aeroméxico 3 2026-05-06
AMX443 Aeroméxico 3 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 AMX436 MEX → MCO May 30, 20:30 UTCMay 30, 22:45 UTC2h 15m
2026-05-30 AMX609 PHL → MEX May 30, 13:45 UTCMay 30, 17:55 UTC4h 10m
2026-05-29 AMX608 MEX → PHL May 29, 19:20 UTCMay 29, 23:30 UTC4h 10m
2026-05-29 AMX815 CME → MEX May 29, 13:50 UTCMay 29, 17:20 UTC3h 30m
2026-05-28 AMX443 MCO → MEX May 28, 21:20 UTCMay 29, 00:35 UTC3h 15m
2026-05-28 AMX434 MEX → MCO May 28, 16:10 UTCMay 28, 18:50 UTC2h 40m
2026-05-28 AMX505 CUN → MEX May 28, 02:55 UTCMay 28, 14:00 UTC11h 5m
2026-05-27 AMX405 JFK → MEX May 27, 12:30 UTCMay 27, 17:10 UTC4h 40m
2026-05-26 AMX404 MEX → JFK May 26, 23:45 UTCMay 27, 03:54 UTC4h 10m
2026-05-26 AMX531 CUN → MEX May 26, 18:59 UTCMay 26, 20:54 UTC1h 55m
2026-05-26 AMX512 MEX → CUN May 26, 15:39 UTCMay 26, 17:35 UTC1h 55m
2026-05-26 AMX313 TGZ → MEX May 26, 04:35 UTCMay 26, 13:24 UTC8h 50m
2026-05-25 AMX551 CUN → MEX May 25, 23:54 UTCMay 26, 02:00 UTC2h 5m
2026-05-25 AMX596 NLU → CUN May 25, 20:40 UTCMay 25, 22:30 UTC1h 50m
2026-05-25 AMX591 CUN → NLU May 25, 16:15 UTCMay 25, 18:05 UTC1h 50m
2026-05-25 AMX500 MEX → CUN May 25, 13:00 UTCMay 25, 15:00 UTC2h 0m
2026-05-25 AMX819 CME → MEX May 25, 02:50 UTCMay 25, 06:40 UTC3h 50m
2026-05-24 AMX645 LAX → MEX May 24, 21:25 UTCMay 24, 21:50 UTC25m
2026-05-24 AMX644 MEX → LAX May 24, 18:10 UTCMay 24, 19:15 UTC1h 5m
2026-05-24 AMX644 MEX → LAX May 24, 15:35 UTCMay 24, 15:45 UTC10m
2026-05-21 AMX1711 HMO → MEX May 21, 01:00 UTCMay 21, 01:10 UTC10m
2026-05-20 AMX1711 HMO → MEX May 20, 22:55 UTCMay 20, 23:10 UTC15m
2026-05-20 AMX1704 MEX → HMO May 20, 21:05 UTCMay 20, 21:25 UTC20m
2026-05-20 AMX1704 MEX → HMO May 20, 19:00 UTCMay 20, 19:10 UTC10m
2026-05-20 AMX405 JFK → MEX May 20, 12:40 UTCMay 20, 17:10 UTC4h 30m
2026-05-19 AMX404 MEX → JFK May 19, 23:05 UTCMay 20, 03:25 UTC4h 20m
2026-05-19 AMX681 YUL → MEX May 19, 15:20 UTCMay 19, 20:30 UTC5h 10m
2026-05-19 AMX680 MEX → YUL May 19, 07:00 UTCMay 19, 11:30 UTC4h 30m
2026-05-18 AMX375 TAP → MEX May 18, 22:40 UTCMay 19, 03:05 UTC4h 25m
2026-05-18 AMX838 MEX → MID May 18, 02:20 UTCMay 18, 14:45 UTC12h 25m
2026-05-17 AMX443 MCO → MEX May 17, 21:10 UTCMay 18, 00:05 UTC2h 55m
2026-05-17 AMX434 MEX → MCO May 17, 16:10 UTCMay 17, 18:55 UTC2h 45m
2026-05-17 AMX505 CUN → MEX May 17, 12:15 UTCMay 17, 14:05 UTC1h 50m
2026-05-17 AMX556 MEX → CUN May 17, 01:35 UTCMay 17, 03:15 UTC1h 40m
2026-05-16 AMX481 LAS → MEX May 16, 20:30 UTCMay 16, 23:50 UTC3h 20m
2026-05-16 AMX484 MEX → LAS May 16, 17:01 UTCMay 16, 18:05 UTC1h 5m
2026-05-16 AMX484 MEX → LAS May 16, 14:51 UTCMay 16, 15:05 UTC15m
2026-05-16 AMX195 TIJ → MEX May 16, 07:16 UTCMay 16, 08:20 UTC1h 5m
2026-05-16 AMX186 MEX → TIJ May 16, 04:20 UTCMay 16, 05:30 UTC1h 10m
2026-05-16 AMX186 MEX → TIJ May 16, 02:25 UTCMay 16, 02:35 UTC10m
2026-05-16 AMX645 LAX → MEX May 16, 00:40 UTCMay 16, 00:50 UTC10m
2026-05-15 AMX645 LAX → MEX May 15, 21:25 UTCMay 15, 22:45 UTC1h 20m
2026-05-15 AMX644 MEX → LAX May 15, 17:30 UTCMay 15, 19:15 UTC1h 45m
2026-05-13 AMX352 MEX → MZT May 13, 23:25 UTCMay 13, 23:35 UTC10m
2026-05-13 AMX441 MCO → MEX May 13, 18:20 UTCMay 13, 21:35 UTC3h 15m
2026-05-13 AMX440 MEX → MCO May 13, 13:50 UTCMay 13, 16:30 UTC2h 40m
2026-05-12 AMX144 MEX → CUU May 12, 21:40 UTCMay 13, 02:35 UTC4h 55m
2026-05-12 AMX693 YYZ → MEX May 12, 15:25 UTCMay 12, 20:01 UTC4h 35m
2026-05-12 AMX692 MEX → YYZ May 12, 06:45 UTCMay 12, 11:05 UTC4h 20m
2026-05-12 AMX375 TAP → MEX May 12, 02:45 UTCMay 12, 03:20 UTC35m

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 XA-OTC page for operator, model, and routing details .

Mode-S 0D121B frequently asked

What is Mode-S code 0D121B?
0D121B is an ICAO 24-bit transponder address. Allocated to Mexico. Assigned to XA-OTC.
Where is Mode-S 0D121B registered?
Mode-S code 0D121B is allocated to Mexico (MX). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 0D121B broadcasting right now?
Yes. Mode-S 0D121B is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0D121B, octal 03211033, decimal 856,603.
What flights does 0D121B operate?
Mode-S 0D121B has broadcast 20 distinct callsigns, including AMX481, AMX186, AMX645, AMX195, AMX644.