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
No current signal · last broadcast Jul 26, 22:35 UTC
Flights observed
526
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:35 UTC

Last known position

Most recent position reported by Mode-S ABBA43.

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
DAL1147 Delta Air Lines 7 2026-07-23
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
DAL2905 - 5 2026-07-18
DAL2894 Delta Air Lines 5 2026-07-25
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
DAL3196 Delta Air Lines 4 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL1013 DTW → CLT Jul 26, 21:35 UTCJul 26, 22:20 UTC45m
2026-07-26 DAL1013 DTW → CLT Jul 26, 19:20 UTCJul 26, 20:05 UTC45m
2026-07-26 DAL801 ATL → YUL Jul 26, 16:20 UTCJul 26, 17:40 UTC1h 20m
2026-07-26 DAL801 ATL → YUL Jul 26, 13:15 UTCJul 26, 14:45 UTC1h 30m
2026-07-26 DAL1146 LGA → MSP Jul 26, 11:00 UTCJul 26, 11:30 UTC30m
2026-07-25 DAL1021 LAX → SEA Jul 25, 22:10 UTCJul 25, 22:35 UTC25m
2026-07-25 DAL2894 ATL → PHL Jul 25, 19:05 UTCJul 25, 20:25 UTC1h 20m
2026-07-25 DAL2894 ATL → PHL Jul 25, 19:01 UTCJul 25, 20:20 UTC1h 19m
2026-07-25 DAL2894 ATL → PHL Jul 25, 15:35 UTCJul 25, 17:05 UTC1h 30m
2026-07-25 DAL2988 HPN → ATL Jul 25, 12:05 UTCJul 25, 13:40 UTC1h 35m
2026-07-25 DAL2669 SLC → GEG Jul 25, 00:45 UTCJul 25, 02:30 UTC1h 45m
2026-07-24 DAL3169 CVG → ATL Jul 24, 21:20 UTCJul 24, 22:20 UTC1h 0m
2026-07-24 DAL3169 CVG → ATL Jul 24, 18:05 UTCJul 24, 19:20 UTC1h 15m
2026-07-24 DAL3196 XNA → DTW Jul 24, 15:15 UTCJul 24, 16:30 UTC1h 15m
2026-07-24 DAL3196 XNA → DTW Jul 24, 12:25 UTCJul 24, 13:30 UTC1h 5m
2026-07-24 DAL3015 TYS → ATL Jul 24, 09:55 UTCJul 24, 10:20 UTC25m
2026-07-24 DAL3015 TYS → ATL Jul 24, 09:49 UTCJul 24, 10:21 UTC32m
2026-07-24 DAL3072 ATL → TYS Jul 24, 03:38 UTCJul 24, 04:09 UTC31m
2026-07-24 DAL3072 ATL → TYS Jul 24, 03:40 UTCJul 24, 04:10 UTC30m
2026-07-23 DAL2735 JFK → DEN Jul 23, 23:25 UTCJul 24, 01:20 UTC1h 55m
2026-07-23 DAL2735 JFK → DEN Jul 23, 19:55 UTCJul 23, 21:45 UTC1h 50m
2026-07-23 DAL1147 ORD → ATL Jul 23, 17:25 UTCJul 23, 18:15 UTC50m
2026-07-23 DAL1147 ORD → ATL Jul 23, 16:50 UTCJul 23, 17:20 UTC30m
2026-07-23 DAL1147 ORD → ATL Jul 23, 13:45 UTCJul 23, 15:15 UTC1h 30m
2026-07-23 DAL2469 LGA → RSW Jul 23, 10:15 UTCJul 23, 11:20 UTC1h 5m
2026-07-23 DAL1545 BNA → DTW Jul 23, 02:20 UTCJul 23, 03:25 UTC1h 5m
2026-07-22 DAL2427 SAN → MSP Jul 22, 21:46 UTCJul 23, 00:12 UTC2h 26m
2026-07-22 DAL2427 SAN → MSP Jul 22, 21:50 UTCJul 23, 00:15 UTC2h 25m
2026-07-22 DAL2427 SAN → MSP Jul 22, 16:20 UTCJul 22, 18:45 UTC2h 25m
2026-07-22 DAL1074 MSP → LGA Jul 22, 12:10 UTCJul 22, 14:35 UTC2h 25m
2026-07-22 DAL971 MSP → CMH Jul 22, 00:25 UTCJul 22, 02:55 UTC2h 30m
2026-07-21 DAL1353 JFK → MSP Jul 21, 21:05 UTCJul 21, 22:50 UTC1h 45m
2026-07-21 DAL1353 JFK → MSP Jul 21, 21:03 UTCJul 21, 22:44 UTC1h 41m
2026-07-21 DAL1353 JFK → MSP Jul 21, 18:20 UTCJul 21, 19:45 UTC1h 25m
2026-07-21 DAL2356 - Jul 21, 16:10 UTCJul 21, 16:55 UTC45m
2026-07-21 DAL2356 - Jul 21, 13:40 UTCJul 21, 14:25 UTC45m
2026-07-21 DAL3019 PNS → ATL Jul 21, 11:10 UTCJul 21, 11:50 UTC40m
2026-07-21 DAL3021 ATL → PNS Jul 21, 00:00 UTCJul 21, 00:50 UTC50m
2026-07-21 DAL3021 ATL → PNS Jul 21, 00:00 UTCJul 21, 00:44 UTC44m
2026-07-20 DAL1800 MBJ → ATL Jul 20, 15:30 UTCJul 20, 22:10 UTC6h 40m
2026-07-20 DAL1653 MIA → LGA Jul 20, 12:40 UTCJul 20, 14:00 UTC1h 20m
2026-07-19 DAL533 ATL → PHX Jul 19, 22:02 UTCJul 20, 01:42 UTC3h 40m
2026-07-19 DAL533 ATL → PHX Jul 19, 22:05 UTCJul 20, 00:45 UTC2h 40m
2026-07-19 DAL1656 ANC → SEA Jul 19, 17:15 UTCJul 19, 20:20 UTC3h 5m
2026-07-19 DAL1656 ANC → SEA Jul 19, 17:14 UTCJul 19, 20:16 UTC3h 2m
2026-07-19 DAL931 CVG → LAX Jul 19, 00:40 UTCJul 19, 03:55 UTC3h 15m
2026-07-18 DAL2905 LAS → SEA Jul 18, 21:05 UTCJul 18, 23:00 UTC1h 55m
2026-07-18 DAL2905 SEA → LAS Jul 18, 17:35 UTCJul 18, 19:40 UTC2h 5m
2026-07-18 DAL1418 MSP → SEA Jul 18, 12:10 UTCJul 18, 15:20 UTC3h 10m
2026-07-18 DAL2284 - Jul 18, 00:15 UTCJul 18, 03:00 UTC2h 46m

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?
No active broadcast right now. Last signal was Jul 26, 22:35 UTC.
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, DAL1147, DAL2320, DAL539, DAL532.