Apparatus

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sensors Mode-S transponder

A43B91

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N372DN · AIRBUS A-321 · operated by BANK OF UTAH TRUSTEE

Hex
A43B91
Octal
51035621
Decimal
10,763,153
Country
US
Tail
N372DN
Type
A321
Broadcasting now · callsign DAL2076 · 34,025 ft
Flights observed
520
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Current position

A43B91 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A43B91 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
DAL2465 Delta Air Lines 8 2026-07-19
DAL995 Delta Air Lines 7 2026-05-04
DAL371 Delta Air Lines 7 2026-06-12
DAL2564 - 7 2026-07-11
DAL988 Delta Air Lines 6 2026-06-12
DAL581 - 6 2026-06-24
DAL2927 Delta Air Lines 6 2026-07-26
DAL2125 Delta Air Lines 6 2026-06-28
DAL1733 - 6 2026-07-14
DAL1305 Delta Air Lines 6 2026-05-06
DAL1025 Delta Air Lines 6 2026-06-09
DAL519 Delta Air Lines 5 2026-06-14
DAL342 - 5 2026-06-12
DAL2561 - 5 2026-07-14
DAL2397 Delta Air Lines 5 2026-06-14
DAL1882 Delta Air Lines 5 2026-05-17
DAL1455 Delta Air Lines 5 2026-07-24
DAL1408 - 5 2026-07-03
DAL1227 Delta Air Lines 5 2026-07-07
DAL1220 Delta Air Lines 5 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL824 ATL → SFO Jul 26, 19:55 UTCJul 26, 22:15 UTC2h 20m
2026-07-26 DAL2927 LAX → PHX Jul 26, 16:50 UTCJul 26, 18:35 UTC1h 45m
2026-07-26 DAL2219 JFK → MIA Jul 26, 11:00 UTCJul 26, 14:15 UTC3h 15m
2026-07-26 DAL2219 JFK → MIA Jul 26, 11:00 UTCJul 26, 14:23 UTC3h 23m
2026-07-25 DAL2268 DAY → ATL Jul 25, 23:45 UTCJul 26, 02:35 UTC2h 50m
2026-07-25 DAL1730 DTW → ALB Jul 25, 16:25 UTCJul 25, 19:30 UTC3h 5m
2026-07-25 DAL1730 DTW → ALB Jul 25, 16:24 UTCJul 25, 19:28 UTC3h 4m
2026-07-25 DAL1730 DTW → ALB Jul 25, 12:10 UTCJul 25, 14:45 UTC2h 35m
2026-07-25 DAL1220 DAL → ATL Jul 25, 00:45 UTCJul 25, 02:15 UTC1h 30m
2026-07-25 DAL1220 DAL → ATL Jul 25, 00:42 UTCJul 25, 02:13 UTC1h 31m
2026-07-24 DAL2431 ATL → MKE Jul 24, 20:45 UTCJul 24, 23:20 UTC2h 35m
2026-07-24 DAL2431 ATL → MKE Jul 24, 20:42 UTCJul 24, 23:12 UTC2h 30m
2026-07-24 DAL1455 SLC → SMF Jul 24, 16:35 UTCJul 24, 18:45 UTC2h 10m
2026-07-24 DAL1455 SLC → SMF Jul 24, 16:34 UTCJul 24, 18:48 UTC2h 14m
2026-07-24 DAL1455 SLC → SMF Jul 24, 13:10 UTCJul 24, 15:15 UTC2h 5m
2026-07-24 DAL1019 ORD → DTW Jul 24, 09:45 UTCJul 24, 11:20 UTC1h 35m
2026-07-24 DAL1187 MCO → BOS Jul 24, 02:20 UTCJul 24, 03:45 UTC1h 25m
2026-07-23 DAL337 DTW → ORD Jul 23, 22:00 UTCJul 24, 00:25 UTC2h 25m
2026-07-23 DAL337 DTW → ORD Jul 23, 18:20 UTCJul 23, 20:20 UTC2h 0m
2026-07-23 DAL947 PBI → LGA Jul 23, 13:05 UTCJul 23, 16:20 UTC3h 15m
2026-07-23 DAL2076 BOS → BNA Jul 23, 01:00 UTCJul 23, 04:35 UTC3h 35m
2026-07-22 DAL2067 LGA → BOS Jul 22, 21:45 UTCJul 22, 23:10 UTC1h 25m
2026-07-22 DAL346 BOS → SFO Jul 22, 17:45 UTCJul 22, 20:10 UTC2h 25m
2026-07-22 DAL1113 PHL → SLC Jul 22, 13:00 UTCJul 22, 16:00 UTC3h 0m
2026-07-21 DAL2559 LGA → FLL Jul 21, 23:10 UTCJul 22, 01:50 UTC2h 40m
2026-07-21 DAL1379 JFK → LAX Jul 21, 20:45 UTCJul 21, 22:05 UTC1h 20m
2026-07-21 DAL729 SFO → LAX Jul 21, 13:45 UTCJul 21, 17:45 UTC4h 0m
2026-07-21 DAL896 MSP → PBI Jul 21, 02:35 UTCJul 21, 06:15 UTC3h 40m
2026-07-21 DAL896 MSP → PBI Jul 21, 02:35 UTCJul 21, 06:13 UTC3h 38m
2026-07-20 DAL968 LGA → ATL Jul 20, 21:55 UTCJul 20, 23:40 UTC1h 45m
2026-07-20 DAL460 FLL → MSP Jul 20, 18:05 UTCJul 20, 19:55 UTC1h 50m
2026-07-20 DAL460 FLL → MSP Jul 20, 18:02 UTCJul 20, 19:50 UTC1h 48m
2026-07-20 DAL989 ATL → ONT Jul 20, 14:45 UTCJul 20, 16:30 UTC1h 45m
2026-07-20 DAL1487 TPA → BOS Jul 20, 11:25 UTCJul 20, 12:40 UTC1h 15m
2026-07-20 DAL1487 TPA → BOS Jul 20, 11:24 UTCJul 20, 12:34 UTC1h 10m
2026-07-20 DAL2940 ATL → DTW Jul 20, 03:55 UTCJul 20, 05:25 UTC1h 30m
2026-07-20 DAL970 LGA → ATL Jul 20, 00:00 UTCJul 20, 01:45 UTC1h 45m
2026-07-19 DAL2465 ATL → PHL Jul 19, 19:40 UTCJul 19, 22:10 UTC2h 30m
2026-07-19 DAL2465 ATL → PHL Jul 19, 15:40 UTCJul 19, 18:05 UTC2h 25m
2026-07-19 DAL9888 - Jul 19, 12:55 UTCJul 19, 13:40 UTC45m
2026-07-18 DAL2719 MSP → RIC Jul 18, 14:10 UTCJul 18, 16:40 UTC2h 30m
2026-07-18 DAL2719 MSP → RIC Jul 18, 14:09 UTCJul 18, 16:33 UTC2h 24m
2026-07-18 DAL2538 - Jul 18, 10:15 UTCJul 18, 12:40 UTC2h 25m
2026-07-18 DAL2538 RDU → MSP Jul 18, 10:13 UTCJul 18, 12:32 UTC2h 19m
2026-07-18 DAL2932 MSP → RDU Jul 18, 01:39 UTCJul 18, 03:45 UTC2h 6m
2026-07-17 DAL2167 PDX → MSP Jul 17, 21:00 UTCJul 17, 23:55 UTC2h 55m
2026-07-17 DAL2167 MSP → PDX Jul 17, 16:10 UTCJul 17, 19:15 UTC3h 5m
2026-07-17 DAL2538 - Jul 17, 12:00 UTCJul 17, 14:15 UTC2h 15m
2026-07-17 DAL2932 MSP → RDU Jul 17, 02:05 UTCJul 17, 04:14 UTC2h 10m
2026-07-16 DAL2271 CVG → RSW Jul 16, 22:30 UTCJul 16, 23:59 UTC1h 30m

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 N372DN page for operator, model, and routing details .

Mode-S A43B91 frequently asked

What is Mode-S code A43B91?
A43B91 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N372DN.
Where is Mode-S A43B91 registered?
Mode-S code A43B91 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 A43B91 broadcasting right now?
Yes. Mode-S A43B91 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A43B91, octal 51035621, decimal 10,763,153.
What flights does A43B91 operate?
Mode-S A43B91 has broadcast 20 distinct callsigns, including DAL2465, DAL995, DAL371, DAL2564, DAL988.