sensors Mode-S transponder

0D0E21

ICAO 24-bit transponder address · allocated to Mexico

Currently assigned to XA-MJJ · BOEING 737 MAX 9

Hex
0D0E21
Octal
03207041
Decimal
855,585
Country
MX
Tail
XA-MJJ
Type
B39M
No current signal · last broadcast 1d ago
Flights observed
8
Distinct callsigns
6
Country
MX
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 0D0E21.

Country allocation

The ICAO 24-bit address 0D0E21 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 6 distinct

Callsign Airline Flights Last seen
AMX953 Aeroméxico 2 2026-04-13
AMX940 Aeroméxico 2 2026-04-13
AMX352 - 1 2026-04-13
AMX233 - 1 2026-04-13
AMX222 - 1 2026-04-13
AMX1546 - 1 2026-04-12

Recent flights last 8

DateFlightRouteTakeoffLandingDuration
2026-04-13 AMX352 - Apr 13, 23:05 UTCApr 13, 23:20 UTC15m
2026-04-13 AMX233 - Apr 13, 20:40 UTCApr 13, 21:10 UTC30m
2026-04-13 AMX222 - Apr 13, 17:55 UTCApr 13, 18:05 UTC10m
2026-04-13 AMX953 MTY → MEX Apr 13, 03:40 UTCApr 13, 03:50 UTC10m
2026-04-13 AMX953 MTY → MEX Apr 13, 02:40 UTCApr 13, 03:05 UTC25m
2026-04-13 AMX940 MEX → MTY Apr 13, 00:20 UTCApr 13, 00:45 UTC25m
2026-04-13 AMX940 MEX → MTY Apr 13, 00:05 UTCApr 13, 00:45 UTC40m
2026-04-12 AMX1546 - Apr 12, 17:15 UTCApr 12, 20:15 UTC3h 0m

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-MJJ page for operator, model, and routing details .

Mode-S 0D0E21 frequently asked

What is Mode-S code 0D0E21?
0D0E21 is an ICAO 24-bit transponder address. Allocated to Mexico. Assigned to XA-MJJ.
Where is Mode-S 0D0E21 registered?
Mode-S code 0D0E21 is allocated to Mexico (MX). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 0D0E21 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 0D0E21, octal 03207041, decimal 855,585.
What flights does 0D0E21 operate?
Mode-S 0D0E21 has broadcast 6 distinct callsigns, including AMX953, AMX940, AMX352, AMX233, AMX222.