Apparatus

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sensors Mode-S transponder

ABBA55

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N855EF · CIRRUS SR-20 · operated by LUFTHANSA AVIATION TRAINING USA INC

Hex
ABBA55
Octal
52735125
Decimal
11,254,357
Country
US
Tail
N855EF
Type
SR20
No current signal · last broadcast 11h ago
Flights observed
223
Distinct callsigns
1
Country
US
Last broadcast
11h ago

Last known position

Most recent position reported by Mode-S ABBA55.

Country allocation

The ICAO 24-bit address ABBA55 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 1 distinct

Callsign Airline Flights Last seen
VAR855 - 223 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 VAR855 - Jul 13, 23:10 UTCJul 13, 23:50 UTC40m
2026-07-13 VAR855 - Jul 13, 21:40 UTCJul 13, 22:10 UTC30m
2026-07-13 VAR855 GYR → GYR Jul 13, 15:45 UTCJul 13, 17:35 UTC1h 50m
2026-07-12 VAR855 GYR → GYR Jul 12, 21:00 UTCJul 12, 23:15 UTC2h 15m
2026-07-11 VAR855 GYR → GYR Jul 11, 22:10 UTCJul 12, 00:30 UTC2h 20m
2026-07-11 VAR855 GYR → GYR Jul 11, 17:05 UTCJul 11, 19:15 UTC2h 10m
2026-07-11 VAR855 - Jul 11, 14:10 UTCJul 11, 16:00 UTC1h 50m
2026-07-11 VAR855 - Jul 11, 13:50 UTCJul 11, 14:00 UTC10m
2026-07-11 VAR855 RAL → GYR Jul 11, 02:15 UTCJul 11, 04:20 UTC2h 5m
2026-07-10 VAR855 GYR → RAL Jul 10, 22:45 UTCJul 11, 00:45 UTC2h 0m
2026-07-10 VAR855 GYR → GYR Jul 10, 18:50 UTCJul 10, 21:00 UTC2h 10m
2026-07-10 VAR855 - Jul 10, 16:00 UTCJul 10, 17:35 UTC1h 35m
2026-07-10 VAR855 GYR → GYR Jul 10, 13:10 UTCJul 10, 14:55 UTC1h 45m
2026-07-09 VAR855 GYR → GYR Jul 9, 21:20 UTCJul 9, 23:00 UTC1h 40m
2026-07-09 VAR855 GYR → GYR Jul 9, 14:50 UTCJul 9, 16:40 UTC1h 50m
2026-07-09 VAR855 GYR → GYR Jul 9, 04:55 UTCJul 9, 06:00 UTC1h 5m
2026-07-08 VAR855 GYR → GYR Jul 8, 22:45 UTCJul 8, 23:50 UTC1h 5m
2026-07-08 VAR855 GYR → GYR Jul 8, 18:40 UTCJul 8, 19:25 UTC45m
2026-07-08 VAR855 GYR → GYR Jul 8, 15:55 UTCJul 8, 16:40 UTC45m
2026-07-07 VAR855 GYR → GYR Jul 7, 20:30 UTCJul 7, 22:30 UTC2h 0m
2026-07-07 VAR855 GYR → GYR Jul 7, 16:35 UTCJul 7, 18:00 UTC1h 25m
2026-07-05 VAR855 - Jul 5, 03:05 UTCJul 5, 05:05 UTC2h 0m
2026-07-04 VAR855 GYR → GYR Jul 4, 23:15 UTCJul 5, 00:50 UTC1h 35m
2026-07-04 VAR855 GYR → GYR Jul 4, 18:50 UTCJul 4, 20:50 UTC2h 0m
2026-07-04 VAR855 GYR → GYR Jul 4, 14:50 UTCJul 4, 16:50 UTC2h 0m
2026-07-03 VAR855 - Jul 3, 20:05 UTCJul 3, 20:50 UTC45m
2026-07-03 VAR855 GYR → BXK Jul 3, 17:30 UTCJul 3, 18:35 UTC1h 5m
2026-07-03 VAR855 - Jul 3, 03:15 UTCJul 3, 04:55 UTC1h 40m
2026-07-02 VAR855 GYR → GYR Jul 2, 23:50 UTCJul 3, 01:30 UTC1h 40m
2026-07-02 VAR855 GYR → GYR Jul 2, 19:55 UTCJul 2, 22:10 UTC2h 15m
2026-07-02 VAR855 GYR → GYR Jul 2, 17:10 UTCJul 2, 18:35 UTC1h 25m
2026-07-02 VAR855 GYR → GYR Jul 2, 14:25 UTCJul 2, 15:35 UTC1h 10m
2026-07-02 VAR855 - Jul 2, 00:15 UTCJul 2, 02:35 UTC2h 20m
2026-07-01 VAR855 GYR → GYR Jul 1, 21:10 UTCJul 1, 23:20 UTC2h 10m
2026-07-01 VAR855 - Jul 1, 17:20 UTCJul 1, 19:05 UTC1h 45m
2026-07-01 VAR855 GYR → GYR Jul 1, 13:00 UTCJul 1, 14:50 UTC1h 50m
2026-06-30 VAR855 GYR → GYR Jun 30, 20:35 UTCJun 30, 22:20 UTC1h 45m
2026-06-30 VAR855 GYR → GYR Jun 30, 15:50 UTCJun 30, 17:20 UTC1h 30m
2026-06-29 VAR855 - Jun 29, 22:44 UTCJun 30, 00:09 UTC1h 25m
2026-06-29 VAR855 GYR → GYR Jun 29, 19:39 UTCJun 29, 20:49 UTC1h 10m
2026-06-29 VAR855 - Jun 29, 16:35 UTCJun 29, 17:49 UTC1h 15m
2026-06-29 VAR855 GYR → GYR Jun 29, 02:45 UTCJun 29, 04:04 UTC1h 20m
2026-06-28 VAR855 GYR → GYR Jun 28, 22:45 UTCJun 29, 00:44 UTC2h 0m
2026-06-28 VAR855 GYR → GYR Jun 28, 20:45 UTCJun 28, 22:04 UTC1h 20m
2026-06-28 VAR855 GYR → GYR Jun 28, 18:00 UTCJun 28, 19:04 UTC1h 5m
2026-06-28 VAR855 - Jun 28, 15:55 UTCJun 28, 17:10 UTC1h 15m
2026-06-28 VAR855 GYR → GYR Jun 28, 13:40 UTCJun 28, 14:54 UTC1h 15m
2026-06-28 VAR855 GYR → GYR Jun 28, 04:20 UTCJun 28, 05:40 UTC1h 20m
2026-06-28 VAR855 GYR → GYR Jun 28, 03:29 UTCJun 28, 03:59 UTC30m
2026-06-28 VAR855 GYR → GYR Jun 28, 00:00 UTCJun 28, 02:14 UTC2h 15m

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 N855EF page for operator, model, and routing details .

Mode-S ABBA55 frequently asked

What is Mode-S code ABBA55?
ABBA55 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N855EF.
Where is Mode-S ABBA55 registered?
Mode-S code ABBA55 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 ABBA55 broadcasting right now?
No active broadcast right now. Last signal was 11h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABBA55, octal 52735125, decimal 11,254,357.
What flights does ABBA55 operate?
Mode-S ABBA55 has broadcast 1 distinct callsign, including VAR855.