Apparatus

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sensors Mode-S transponder

AB8B56

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N843DN · BOEING 737-900 · operated by DELTA AIR LINES INC

Hex
AB8B56
Octal
52705526
Decimal
11,242,326
Country
US
Tail
N843DN
Type
B739
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
520
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S AB8B56.

Country allocation

The ICAO 24-bit address AB8B56 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
DAL1159 Delta Air Lines 8 2026-05-03
DAL1151 Delta Air Lines 8 2026-06-05
DAL2894 - 6 2026-06-30
DAL2300 - 6 2026-06-25
DAL2074 - 6 2026-06-26
DAL1879 - 6 2026-06-28
DAL1861 - 6 2026-06-28
DAL3129 Delta Air Lines 5 2026-05-03
DAL2755 - 5 2026-07-16
DAL2531 Delta Air Lines 5 2026-06-25
DAL937 Delta Air Lines 4 2026-06-01
DAL858 Delta Air Lines 4 2026-07-23
DAL823 - 4 2026-07-12
DAL698 Delta Air Lines 4 2026-07-25
DAL635 - 4 2026-07-11
DAL517 Delta Air Lines 4 2026-04-27
DAL355 Delta Air Lines 4 2026-07-22
DAL3086 Delta Air Lines 4 2026-05-03
DAL2607 - 4 2026-07-21
DAL2401 Delta Air Lines 4 2026-04-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL503 BOS → ATL Jul 26, 21:15 UTCJul 26, 21:30 UTC15m
2026-07-26 DAL2710 LGA → IAH Jul 26, 18:10 UTCJul 26, 19:30 UTC1h 20m
2026-07-26 DAL2710 LGA → IAH Jul 26, 18:10 UTCJul 26, 19:39 UTC1h 29m
2026-07-26 DAL2883 JFK → MIA Jul 26, 14:40 UTCJul 26, 16:35 UTC1h 55m
2026-07-26 DAL2478 BNA → BOS Jul 26, 12:20 UTCJul 26, 13:15 UTC55m
2026-07-26 DAL2478 BNA → BOS Jul 26, 12:19 UTCJul 26, 13:15 UTC56m
2026-07-26 DAL2938 SJC → SLC Jul 26, 03:45 UTCJul 26, 04:40 UTC55m
2026-07-25 DAL3138 GNV → ATL Jul 25, 23:45 UTCJul 26, 00:55 UTC1h 10m
2026-07-25 DAL3138 GNV → ATL Jul 25, 23:43 UTCJul 26, 01:01 UTC1h 18m
2026-07-25 DAL2228 SLC → IND Jul 25, 19:50 UTCJul 25, 22:30 UTC2h 40m
2026-07-25 DAL2228 SLC → IND Jul 25, 19:49 UTCJul 25, 22:28 UTC2h 39m
2026-07-25 DAL698 DTW → SLC Jul 25, 13:15 UTCJul 25, 16:40 UTC3h 25m
2026-07-25 DAL698 DTW → SLC Jul 25, 13:14 UTCJul 25, 16:38 UTC3h 24m
2026-07-25 DAL335 ATL → SLC Jul 25, 06:20 UTCJul 25, 10:10 UTC3h 50m
2026-07-25 DAL2197 HPN → ATL Jul 25, 03:55 UTCJul 25, 04:55 UTC1h 0m
2026-07-25 DAL2197 HPN → ATL Jul 25, 03:49 UTCJul 25, 04:47 UTC58m
2026-07-24 DAL2096 MKE → ATL Jul 24, 23:15 UTCJul 25, 02:35 UTC3h 20m
2026-07-24 DAL2096 MKE → ATL Jul 24, 17:50 UTCJul 24, 21:15 UTC3h 25m
2026-07-23 DAL614 CUN → LAX Jul 23, 23:30 UTCJul 24, 03:50 UTC4h 20m
2026-07-23 DAL615 LAX → CUN Jul 23, 17:40 UTCJul 23, 22:00 UTC4h 20m
2026-07-23 DAL891 MSP → MEM Jul 23, 12:10 UTCJul 23, 15:45 UTC3h 35m
2026-07-23 DAL858 EWR → ATL Jul 23, 01:45 UTCJul 23, 05:20 UTC3h 35m
2026-07-22 DAL355 JFK → LAX Jul 22, 20:40 UTCJul 23, 00:15 UTC3h 35m
2026-07-22 DAL355 JFK → LAX Jul 22, 20:35 UTCJul 23, 00:12 UTC3h 37m
2026-07-22 DAL2214 FLL → LGA Jul 22, 16:20 UTCJul 22, 19:15 UTC2h 55m
2026-07-22 DAL1440 GEG → SLC Jul 22, 12:30 UTCJul 22, 13:45 UTC1h 15m
2026-07-21 DAL2607 MSP → SLC Jul 21, 23:25 UTCJul 22, 01:55 UTC2h 30m
2026-07-21 DAL2607 MSP → SLC Jul 21, 23:24 UTCJul 22, 01:47 UTC2h 23m
2026-07-21 DAL536 SEA → MSP Jul 21, 16:25 UTCJul 21, 19:10 UTC2h 45m
2026-07-21 DAL814 DTW → BDL Jul 21, 10:10 UTCJul 21, 14:40 UTC4h 30m
2026-07-20 DAL1911 CUN → DTW Jul 20, 19:25 UTCJul 20, 23:00 UTC3h 35m
2026-07-20 DAL578 DTW → CUN Jul 20, 14:30 UTCJul 20, 17:30 UTC3h 0m
2026-07-20 DAL578 DTW → CUN Jul 20, 14:30 UTCJul 20, 17:44 UTC3h 14m
2026-07-20 DAL2439 - Jul 20, 11:15 UTCJul 20, 12:25 UTC1h 10m
2026-07-20 DAL858 EWR → ATL Jul 20, 01:40 UTCJul 20, 05:30 UTC3h 50m
2026-07-20 DAL858 EWR → ATL Jul 20, 01:39 UTCJul 20, 05:29 UTC3h 50m
2026-07-19 DAL355 JFK → LAX Jul 19, 20:50 UTCJul 20, 00:25 UTC3h 35m
2026-07-19 DAL2214 SLC → BNA Jul 19, 15:40 UTCJul 19, 18:35 UTC2h 55m
2026-07-19 DAL2214 SLC → BNA Jul 19, 15:36 UTCJul 19, 18:33 UTC2h 57m
2026-07-19 DAL1440 GEG → SLC Jul 19, 12:35 UTCJul 19, 13:45 UTC1h 10m
2026-07-18 DAL2418 SFO → DTW Jul 18, 23:25 UTCJul 19, 02:10 UTC2h 45m
2026-07-18 DAL1226 MSP → MSP Jul 18, 14:10 UTCJul 18, 19:45 UTC5h 35m
2026-07-18 DAL1274 - Jul 18, 11:15 UTCJul 18, 11:55 UTC40m
2026-07-18 DAL1274 MSN → MSP Jul 18, 11:11 UTCJul 18, 11:52 UTC41m
2026-07-18 DAL1599 MSP → MSN Jul 18, 03:05 UTCJul 18, 03:40 UTC35m
2026-07-17 DAL2699 - Jul 17, 23:30 UTCJul 18, 01:45 UTC2h 15m
2026-07-17 DAL2699 MSP → RDU Jul 17, 19:49 UTCJul 17, 22:00 UTC2h 10m
2026-07-17 DAL2697 - Jul 17, 16:29 UTCJul 17, 17:44 UTC1h 15m
2026-07-16 DAL894 - Jul 16, 22:35 UTCJul 17, 00:40 UTC2h 5m
2026-07-16 DAL3146 - Jul 16, 20:19 UTCJul 16, 21:19 UTC1h 0m

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 N843DN page for operator, model, and routing details .

Mode-S AB8B56 frequently asked

What is Mode-S code AB8B56?
AB8B56 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N843DN.
Where is Mode-S AB8B56 registered?
Mode-S code AB8B56 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 AB8B56 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB8B56, octal 52705526, decimal 11,242,326.
What flights does AB8B56 operate?
Mode-S AB8B56 has broadcast 20 distinct callsigns, including DAL1159, DAL1151, DAL2894, DAL2300, DAL2074.