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sensors Mode-S transponder

A57E5C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N453MH · AIRBUS HELICOPTERS EC-145 · operated by MEMORIAL HERMANN HEALTH SYSTEM

Hex
A57E5C
Octal
51277134
Decimal
10,845,788
Country
US
Tail
N453MH
Type
EC45
No current signal · last broadcast 12d ago
Flights observed
98
Distinct callsigns
2
Country
US
Last broadcast
12d ago

Last known position

Most recent position reported by Mode-S A57E5C.

Country allocation

The ICAO 24-bit address A57E5C 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 2 distinct

Callsign Airline Flights Last seen
LIFE3 - 87 2026-07-22
RDK3 - 11 2026-05-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-22 LIFE3 - Jul 22, 21:55 UTCJul 22, 22:15 UTC20m
2026-07-19 LIFE3 - Jul 19, 00:25 UTCJul 19, 00:35 UTC10m
2026-07-18 LIFE3 - Jul 18, 23:45 UTCJul 18, 23:55 UTC10m
2026-07-18 LIFE3 - Jul 18, 05:30 UTCJul 18, 06:10 UTC40m
2026-07-17 LIFE3 - Jul 17, 20:10 UTCJul 17, 21:25 UTC1h 15m
2026-07-17 LIFE3 - Jul 17, 17:30 UTCJul 17, 17:44 UTC15m
2026-07-17 LIFE3 - Jul 17, 13:10 UTCJul 17, 13:25 UTC15m
2026-07-17 LIFE3 - Jul 17, 11:50 UTCJul 17, 12:00 UTC10m
2026-07-17 LIFE3 - Jul 17, 03:05 UTCJul 17, 03:55 UTC50m
2026-07-16 LIFE3 - Jul 16, 02:00 UTCJul 16, 02:50 UTC50m
2026-07-15 LIFE3 - Jul 15, 21:35 UTCJul 15, 22:20 UTC45m
2026-07-15 LIFE3 - Jul 15, 02:45 UTCJul 15, 02:55 UTC10m
2026-07-09 LIFE3 - Jul 9, 03:35 UTCJul 9, 04:45 UTC1h 10m
2026-07-08 LIFE3 - Jul 8, 04:20 UTCJul 8, 04:30 UTC10m
2026-07-07 LIFE3 - Jul 7, 10:05 UTCJul 7, 10:15 UTC10m
2026-07-06 LIFE3 - Jul 6, 22:15 UTCJul 6, 22:25 UTC10m
2026-07-06 LIFE3 - Jul 6, 08:00 UTCJul 6, 08:10 UTC10m
2026-07-06 LIFE3 - Jul 6, 01:30 UTCJul 6, 02:10 UTC40m
2026-07-05 LIFE3 - Jul 5, 09:15 UTCJul 5, 10:15 UTC1h 0m
2026-07-05 LIFE3 - Jul 5, 07:55 UTCJul 5, 08:25 UTC30m
2026-07-04 LIFE3 - Jul 4, 21:15 UTCJul 4, 21:25 UTC10m
2026-07-04 LIFE3 - Jul 4, 17:50 UTCJul 4, 18:55 UTC1h 5m
2026-07-01 LIFE3 - Jul 1, 17:00 UTCJul 1, 17:25 UTC25m
2026-06-30 LIFE3 - Jun 30, 04:20 UTCJun 30, 04:30 UTC10m
2026-06-27 LIFE3 - Jun 27, 14:49 UTCJun 27, 15:05 UTC15m
2026-06-27 LIFE3 - Jun 27, 08:14 UTCJun 27, 09:00 UTC45m
2026-06-25 LIFE3 - Jun 25, 06:09 UTCJun 25, 08:50 UTC2h 40m
2026-06-24 LIFE3 - Jun 24, 13:40 UTCJun 24, 13:50 UTC10m
2026-06-23 LIFE3 - Jun 23, 08:15 UTCJun 23, 08:30 UTC15m
2026-06-21 LIFE3 - Jun 21, 23:55 UTCJun 22, 00:20 UTC25m
2026-06-21 LIFE3 - Jun 21, 22:24 UTCJun 21, 22:44 UTC20m
2026-06-21 LIFE3 - Jun 21, 15:44 UTCJun 21, 15:54 UTC10m
2026-06-19 LIFE3 - Jun 19, 07:25 UTCJun 19, 07:45 UTC20m
2026-06-10 LIFE3 - Jun 10, 09:30 UTCJun 10, 09:55 UTC25m
2026-06-10 LIFE3 - Jun 10, 04:25 UTCJun 10, 05:15 UTC50m
2026-06-08 LIFE3 - Jun 8, 09:00 UTCJun 8, 09:30 UTC30m
2026-06-08 LIFE3 - Jun 8, 05:15 UTCJun 8, 05:45 UTC30m
2026-06-07 LIFE3 - Jun 7, 03:50 UTCJun 7, 04:10 UTC20m
2026-06-07 LIFE3 - Jun 7, 00:34 UTCJun 7, 00:44 UTC10m
2026-06-06 LIFE3 - Jun 6, 08:50 UTCJun 6, 09:50 UTC1h 0m
2026-06-05 LIFE3 - Jun 5, 21:15 UTCJun 5, 21:50 UTC35m
2026-06-05 LIFE3 - Jun 5, 07:10 UTCJun 5, 07:55 UTC45m
2026-06-05 LIFE3 - Jun 5, 04:45 UTCJun 5, 04:55 UTC10m
2026-06-03 LIFE3 - Jun 3, 12:45 UTCJun 3, 13:20 UTC35m
2026-06-02 LIFE3 - Jun 2, 05:20 UTCJun 2, 05:55 UTC35m
2026-06-01 LIFE3 - Jun 1, 16:35 UTCJun 1, 16:55 UTC20m
2026-06-01 LIFE3 - Jun 1, 07:00 UTCJun 1, 08:45 UTC1h 45m
2026-06-01 LIFE3 - Jun 1, 04:40 UTCJun 1, 05:00 UTC20m
2026-05-31 LIFE3 - May 31, 19:55 UTCMay 31, 20:40 UTC45m
2026-05-31 LIFE3 - May 31, 18:15 UTCMay 31, 18:35 UTC20m

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 N453MH page for operator, model, and routing details .

Mode-S A57E5C frequently asked

What is Mode-S code A57E5C?
A57E5C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N453MH.
Where is Mode-S A57E5C registered?
Mode-S code A57E5C 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 A57E5C broadcasting right now?
No active broadcast right now. Last signal was 12d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A57E5C, octal 51277134, decimal 10,845,788.
What flights does A57E5C operate?
Mode-S A57E5C has broadcast 2 distinct callsigns, including LIFE3, RDK3.