Apparatus

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sensors Mode-S transponder

ABBA43

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N855DN · BOEING 737-900 · operated by DELTA AIR LINES INC

Hex
ABBA43
Octal
52735103
Decimal
11,254,339
Country
US
Tail
N855DN
Type
B739
Broadcasting now · callsign DAL1804 · 33,000 ft
Flights observed
465
Distinct callsigns
20
Country
US
Last broadcast
36m ago

Current position

ABBA43 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address ABBA43 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 20 distinct

Callsign Airline Flights Last seen
DAL1538 Delta Air Lines 8 2026-05-25
DAL2320 - 6 2026-07-03
DAL539 Delta Air Lines 5 2026-06-27
DAL532 Delta Air Lines 5 2026-05-21
DAL3055 - 5 2026-07-08
DAL1965 - 5 2026-07-06
DAL1907 Delta Air Lines 5 2026-07-02
DAL1763 Delta Air Lines 5 2026-05-18
DAL1757 Delta Air Lines 5 2026-05-29
DAL1752 Delta Air Lines 5 2026-04-29
DAL1547 Delta Air Lines 5 2026-05-08
DAL1500 - 5 2026-06-24
DAL1380 Delta Air Lines 5 2026-04-28
DAL1029 - 5 2026-07-04
DAL904 Delta Air Lines 4 2026-05-05
DAL545 - 4 2026-06-15
DAL2997 - 4 2026-07-14
DAL2850 - 4 2026-07-11
DAL2554 - 4 2026-06-25
DAL2380 - 4 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 DAL1992 - Jul 14, 14:20 UTCJul 14, 20:45 UTC6h 25m
2026-07-14 DAL1499 - Jul 14, 10:10 UTCJul 14, 11:25 UTC1h 15m
2026-07-14 DAL2997 ATL → SRQ Jul 14, 03:30 UTCJul 14, 04:30 UTC1h 0m
2026-07-14 DAL2997 ATL → SRQ Jul 14, 03:27 UTCJul 14, 04:30 UTC1h 3m
2026-07-14 DAL2735 - Jul 14, 00:05 UTCJul 14, 02:00 UTC1h 55m
2026-07-13 DAL2735 ATL → BDL Jul 13, 20:50 UTCJul 13, 23:00 UTC2h 10m
2026-07-13 DAL1147 - Jul 13, 16:35 UTCJul 13, 18:35 UTC2h 0m
2026-07-13 DAL1147 ATL → ORD Jul 13, 13:05 UTCJul 13, 14:40 UTC1h 35m
2026-07-13 DAL1192 - Jul 13, 10:30 UTCJul 13, 10:45 UTC15m
2026-07-13 DAL1192 RDU → ATL Jul 13, 10:29 UTCJul 13, 11:24 UTC55m
2026-07-13 DAL3244 ATL → RDU Jul 13, 01:45 UTCJul 13, 02:45 UTC1h 0m
2026-07-12 DAL1962 CUN → ATL Jul 12, 21:24 UTCJul 12, 23:37 UTC2h 13m
2026-07-12 DAL1962 CUN → ATL Jul 12, 21:25 UTCJul 12, 23:35 UTC2h 10m
2026-07-12 DAL592 ATL → CUN Jul 12, 17:25 UTCJul 12, 19:55 UTC2h 30m
2026-07-12 DAL3058 - Jul 12, 15:01 UTCJul 12, 16:01 UTC1h 0m
2026-07-12 DAL1235 ATL → LEX Jul 12, 01:40 UTCJul 12, 02:30 UTC50m
2026-07-11 DAL1196 RSW → ATL Jul 11, 19:50 UTCJul 11, 21:35 UTC1h 45m
2026-07-11 DAL1196 ATL → RSW Jul 11, 17:20 UTCJul 11, 18:35 UTC1h 15m
2026-07-11 DAL2124 - Jul 11, 14:45 UTCJul 11, 15:30 UTC45m
2026-07-11 DAL2850 - Jul 11, 04:01 UTCJul 11, 04:40 UTC40m
2026-07-11 DAL2850 ATL → CHS Jul 11, 03:57 UTCJul 11, 04:41 UTC44m
2026-07-10 DAL2152 - Jul 10, 23:00 UTCJul 11, 00:45 UTC1h 45m
2026-07-10 DAL2152 - Jul 10, 18:35 UTCJul 10, 20:05 UTC1h 30m
2026-07-10 DAL1523 - Jul 10, 14:30 UTCJul 10, 15:30 UTC1h 0m
2026-07-10 DAL1523 SDF → ATL Jul 10, 14:28 UTCJul 10, 15:25 UTC57m
2026-07-10 DAL1523 - Jul 10, 12:30 UTCJul 10, 13:25 UTC55m
2026-07-10 DAL564 PDX → ATL Jul 10, 06:20 UTCJul 10, 10:35 UTC4h 15m
2026-07-10 DAL357 ATL → PDX Jul 10, 00:30 UTCJul 10, 05:10 UTC4h 40m
2026-07-09 DAL1800 - Jul 9, 20:30 UTCJul 9, 22:15 UTC1h 45m
2026-07-09 DAL1801 - Jul 9, 15:30 UTCJul 9, 17:00 UTC1h 30m
2026-07-09 DAL1801 ATL → MBJ Jul 9, 15:27 UTCJul 9, 17:52 UTC2h 25m
2026-07-09 DAL3165 - Jul 9, 12:15 UTCJul 9, 13:20 UTC1h 5m
2026-07-08 DAL2786 ATL → CMH Jul 8, 21:35 UTCJul 8, 22:40 UTC1h 5m
2026-07-08 DAL1359 PBI → LGA Jul 8, 18:40 UTCJul 8, 19:20 UTC40m
2026-07-08 DAL1359 PBI → LGA Jul 8, 16:30 UTCJul 8, 17:10 UTC40m
2026-07-08 DAL2634 - Jul 8, 14:15 UTCJul 8, 15:05 UTC50m
2026-07-08 DAL2634 ATL → RDU Jul 8, 11:35 UTCJul 8, 12:35 UTC1h 0m
2026-07-08 DAL3055 - Jul 8, 09:15 UTCJul 8, 09:55 UTC40m
2026-07-08 DAL2850 - Jul 8, 03:20 UTCJul 8, 04:00 UTC40m
2026-07-07 DAL2739 - Jul 7, 22:20 UTCJul 8, 00:25 UTC2h 5m
2026-07-07 DAL2739 ATL → BDL Jul 7, 18:05 UTCJul 7, 20:00 UTC1h 55m
2026-07-07 DAL1178 BNA → BOS Jul 7, 15:00 UTCJul 7, 16:30 UTC1h 30m
2026-07-07 DAL1178 BNA → BOS Jul 7, 11:35 UTCJul 7, 13:00 UTC1h 25m
2026-07-07 DAL2136 SJC → ATL Jul 7, 05:05 UTCJul 7, 09:15 UTC4h 10m
2026-07-07 DAL2136 SJC → ATL Jul 7, 05:01 UTCJul 7, 09:07 UTC4h 6m
2026-07-06 DAL2136 ATL → SJC Jul 6, 21:45 UTCJul 7, 02:15 UTC4h 30m
2026-07-06 DAL1965 - Jul 6, 17:40 UTCJul 6, 19:05 UTC1h 25m
2026-07-06 DAL1944 - Jul 6, 14:05 UTCJul 6, 15:30 UTC1h 25m
2026-07-06 DAL3109 - Jul 6, 01:20 UTCJul 6, 02:30 UTC1h 10m
2026-07-05 DAL3109 - Jul 5, 19:55 UTCJul 5, 21:05 UTC1h 10m

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 N855DN page for operator, model, and routing details .

Mode-S ABBA43 frequently asked

What is Mode-S code ABBA43?
ABBA43 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N855DN.
Where is Mode-S ABBA43 registered?
Mode-S code ABBA43 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 ABBA43 broadcasting right now?
Yes. Mode-S ABBA43 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABBA43, octal 52735103, decimal 11,254,339.
What flights does ABBA43 operate?
Mode-S ABBA43 has broadcast 20 distinct callsigns, including DAL1538, DAL2320, DAL539, DAL532, DAL3055.