sensors Mode-S transponder

504E7D

ICAO 24-bit transponder address · allocated to Moldova

Currently assigned to ER-MDR · BOEING 747-400

Hex
504E7D
Octal
24047175
Decimal
5,262,973
Country
MD
Tail
ER-MDR
Type
B744
No current signal · last broadcast 1d ago
Flights observed
49
Distinct callsigns
13
Country
MD
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 504E7D.

Country allocation

The ICAO 24-bit address 504E7D falls within the block assigned to Moldova (MD) by ICAO Annex 10, Volume III. Every aircraft registered in Moldova 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 13 distinct

Callsign Airline Flights Last seen
PXA201 - 12 2026-07-07
PXA602 - 7 2026-07-16
PXA402 - 5 2026-07-10
PXA202 - 5 2026-07-07
PXA403 - 4 2026-07-11
PXA206 - 4 2026-04-17
PXA601 - 3 2026-07-02
PXA451 - 2 2026-04-19
PXA432 - 2 2026-04-13
PXA207 - 2 2026-04-18
PXA501 - 1 2026-06-26
PXA452 - 1 2026-06-03
PXA401 - 1 2026-06-22

Recent flights last 49

DateFlightRouteTakeoffLandingDuration
2026-07-16 PXA602 - Jul 16, 03:40 UTCJul 16, 19:20 UTC15h 40m
2026-07-15 PXA602 - Jul 15, 04:05 UTCJul 15, 18:15 UTC14h 10m
2026-07-11 PXA403 - Jul 11, 06:15 UTCJul 11, 23:25 UTC17h 10m
2026-07-10 PXA403 - Jul 10, 22:45 UTCJul 10, 23:05 UTC20m
2026-07-10 PXA402 - Jul 10, 06:30 UTCJul 10, 06:45 UTC15m
2026-07-09 PXA403 - Jul 9, 14:35 UTCJul 9, 15:30 UTC55m
2026-07-08 PXA402 - Jul 8, 23:55 UTCJul 9, 00:05 UTC10m
2026-07-08 PXA402 AUH → AUH Jul 8, 19:10 UTCJul 8, 19:25 UTC15m
2026-07-07 PXA202 - Jul 7, 19:45 UTCJul 8, 00:15 UTC4h 30m
2026-07-07 PXA201 - Jul 7, 07:35 UTCJul 7, 12:15 UTC4h 40m
2026-07-06 PXA201 - Jul 6, 02:30 UTCJul 6, 15:35 UTC13h 5m
2026-07-06 PXA201 - Jul 6, 00:55 UTCJul 6, 02:25 UTC1h 30m
2026-07-04 PXA602 - Jul 4, 12:15 UTCJul 5, 06:00 UTC17h 45m
2026-07-04 PXA602 - Jul 4, 10:20 UTCJul 5, 06:00 UTC19h 40m
2026-07-03 PXA201 - Jul 3, 14:50 UTCJul 4, 05:50 UTC15h 0m
2026-07-02 PXA601 - Jul 2, 10:40 UTCJul 3, 05:10 UTC18h 30m
2026-07-01 PXA202 - Jul 1, 21:35 UTCJul 2, 01:30 UTC3h 55m
2026-07-01 PXA201 - Jul 1, 12:05 UTCJul 1, 16:40 UTC4h 35m
2026-07-01 PXA201 - Jul 1, 03:20 UTCJul 1, 03:40 UTC20m
2026-06-30 PXA602 - Jun 30, 03:25 UTCJun 30, 22:30 UTC19h 5m
2026-06-28 PXA601 - Jun 28, 16:19 UTCJun 29, 10:10 UTC17h 50m
2026-06-28 PXA202 - Jun 28, 08:05 UTCJun 28, 12:35 UTC4h 30m
2026-06-27 PXA201 - Jun 27, 19:49 UTCJun 28, 00:20 UTC4h 30m
2026-06-26 PXA501 - Jun 26, 19:24 UTCJun 27, 14:39 UTC19h 15m
2026-06-25 PXA201 - Jun 25, 21:10 UTCJun 26, 11:40 UTC14h 30m
2026-06-24 PXA201 - Jun 24, 22:39 UTCJun 25, 15:24 UTC16h 45m
2026-06-23 PXA402 - Jun 23, 04:35 UTCJun 23, 21:39 UTC17h 5m
2026-06-23 PXA402 - Jun 23, 00:50 UTCJun 23, 01:10 UTC20m
2026-06-22 PXA401 - Jun 22, 20:55 UTCJun 22, 21:14 UTC20m
2026-06-19 PXA202 - Jun 19, 02:04 UTCJun 19, 06:39 UTC4h 35m
2026-06-18 PXA201 - Jun 18, 20:05 UTCJun 18, 20:15 UTC10m
2026-06-18 PXA201 - Jun 18, 19:20 UTCJun 18, 19:30 UTC10m
2026-06-17 PXA403 - Jun 17, 22:05 UTCJun 18, 19:30 UTC21h 25m
2026-06-16 PXA202 - Jun 16, 08:10 UTCJun 16, 19:50 UTC11h 41m
2026-06-13 PXA201 - Jun 13, 03:55 UTCJun 13, 17:25 UTC13h 29m
2026-06-03 PXA452 - Jun 3, 18:55 UTCJun 4, 00:30 UTC5h 35m
2026-04-19 PXA451 - Apr 19, 22:50 UTCApr 19, 23:00 UTC10m
2026-04-19 PXA451 - Apr 19, 15:35 UTCApr 19, 22:05 UTC6h 30m
2026-04-18 PXA207 - Apr 18, 07:25 UTCApr 18, 09:20 UTC1h 55m
2026-04-18 PXA207 - Apr 18, 06:50 UTCApr 18, 13:40 UTC6h 50m
2026-04-17 PXA206 - Apr 17, 13:20 UTCApr 17, 14:10 UTC50m
2026-04-17 PXA206 - Apr 17, 11:35 UTCApr 17, 13:15 UTC1h 40m
2026-04-17 PXA206 - Apr 17, 09:55 UTCApr 17, 11:00 UTC1h 5m
2026-04-17 PXA206 - Apr 17, 06:35 UTCApr 17, 07:15 UTC40m
2026-04-15 PXA602 - Apr 15, 22:05 UTCApr 15, 22:30 UTC25m
2026-04-15 PXA601 - Apr 15, 03:30 UTCApr 15, 03:50 UTC20m
2026-04-14 PXA602 - Apr 14, 22:10 UTCApr 14, 22:40 UTC30m
2026-04-13 PXA432 - Apr 13, 16:15 UTCApr 13, 16:30 UTC15m
2026-04-13 PXA432 - Apr 13, 16:05 UTCApr 13, 16:15 UTC10m

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 ER-MDR page for operator, model, and routing details .

Mode-S 504E7D frequently asked

What is Mode-S code 504E7D?
504E7D is an ICAO 24-bit transponder address. Allocated to Moldova. Assigned to ER-MDR.
Where is Mode-S 504E7D registered?
Mode-S code 504E7D is allocated to Moldova (MD). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 504E7D 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 504E7D, octal 24047175, decimal 5,262,973.
What flights does 504E7D operate?
Mode-S 504E7D has broadcast 13 distinct callsigns, including PXA201, PXA602, PXA402, PXA202, PXA403.