Apparatus

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sensors Mode-S transponder

AC259B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N882DN · BOEING 737-900 · operated by UMB BANK NA TRUSTEE

Hex
AC259B
Octal
53022633
Decimal
11,281,819
Country
US
Tail
N882DN
Type
B739
Broadcasting now · callsign DAL2469 · 34,000 ft
Flights observed
406
Distinct callsigns
20
Country
US
Last broadcast
3d ago

Current position

AC259B is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AC259B 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
DAL809 - 6 2026-07-10
DAL368 - 6 2026-06-27
DAL2925 - 5 2026-07-15
DAL2396 Delta Air Lines 5 2026-05-25
DAL1938 Delta Air Lines 5 2026-07-21
DAL1913 Delta Air Lines 5 2026-07-23
DAL2850 - 4 2026-07-17
DAL2700 - 4 2026-07-20
DAL2356 - 4 2026-07-20
DAL1499 - 4 2026-07-02
DAL1496 - 4 2026-07-04
DAL1188 - 4 2026-07-03
DAL1109 Delta Air Lines 4 2026-06-11
DAL904 Delta Air Lines 3 2026-06-13
DAL879 Delta Air Lines 3 2026-04-17
DAL693 Delta Air Lines 3 2026-06-04
DAL582 Delta Air Lines 3 2026-04-16
DAL565 - 3 2026-04-13
DAL539 Delta Air Lines 3 2026-04-17
DAL3104 - 3 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL361 DTW → SFO Jul 26, 19:00 UTCJul 26, 22:45 UTC3h 45m
2026-07-26 DAL361 DTW → SFO Jul 26, 12:40 UTCJul 26, 17:10 UTC4h 30m
2026-07-25 DAL618 CUN → DTW Jul 25, 17:50 UTCJul 25, 21:00 UTC3h 10m
2026-07-25 DAL619 DTW → CUN Jul 25, 13:15 UTCJul 25, 16:20 UTC3h 5m
2026-07-25 DAL1014 ATL → BDL Jul 25, 00:45 UTCJul 25, 02:05 UTC1h 20m
2026-07-25 DAL1014 ATL → BDL Jul 25, 00:44 UTCJul 25, 02:02 UTC1h 18m
2026-07-24 DAL2732 ATL → STL Jul 24, 20:45 UTCJul 24, 22:55 UTC2h 10m
2026-07-24 DAL2732 ATL → STL Jul 24, 20:44 UTCJul 24, 22:58 UTC2h 14m
2026-07-24 DAL536 BOS → ATL Jul 24, 16:34 UTCJul 24, 19:11 UTC2h 37m
2026-07-24 DAL536 BOS → ATL Jul 24, 16:35 UTCJul 24, 19:15 UTC2h 40m
2026-07-24 DAL814 DTW → BDL Jul 24, 10:20 UTCJul 24, 14:35 UTC4h 15m
2026-07-23 DAL1913 DTW → SJU Jul 23, 20:55 UTCJul 23, 22:45 UTC1h 50m
2026-07-23 DAL1913 DTW → SJU Jul 23, 18:30 UTCJul 23, 18:40 UTC10m
2026-07-23 DAL1913 DTW → SJU Jul 23, 16:40 UTCJul 23, 17:00 UTC20m
2026-07-23 DAL1913 DTW → SJU Jul 23, 13:05 UTCJul 23, 14:30 UTC1h 25m
2026-07-23 DAL335 ATL → SLC Jul 23, 06:20 UTCJul 23, 10:10 UTC3h 50m
2026-07-22 DAL517 ATL → BOS Jul 22, 23:00 UTCJul 23, 03:20 UTC4h 20m
2026-07-22 DAL2711 SRQ → LGA Jul 22, 19:55 UTCJul 22, 21:20 UTC1h 25m
2026-07-22 DAL2711 SRQ → LGA Jul 22, 19:50 UTCJul 22, 21:16 UTC1h 26m
2026-07-22 DAL2711 SRQ → LGA Jul 22, 16:50 UTCJul 22, 18:20 UTC1h 30m
2026-07-22 DAL3165 ATL → SDF Jul 22, 13:25 UTCJul 22, 14:45 UTC1h 20m
2026-07-22 DAL2786 LGA → DTW Jul 22, 00:35 UTCJul 22, 02:10 UTC1h 35m
2026-07-21 DAL1976 NAS → ATL Jul 21, 19:55 UTCJul 21, 21:25 UTC1h 30m
2026-07-21 DAL1938 ATL → NAS Jul 21, 16:10 UTCJul 21, 17:25 UTC1h 15m
2026-07-21 DAL1938 ATL → NAS Jul 21, 16:06 UTCJul 21, 17:43 UTC1h 37m
2026-07-21 DAL3165 ATL → SDF Jul 21, 12:45 UTCJul 21, 13:50 UTC1h 5m
2026-07-21 DAL1545 ATL → CMH Jul 21, 00:30 UTCJul 21, 01:35 UTC1h 5m
2026-07-20 DAL2700 STL → ATL Jul 20, 21:15 UTCJul 20, 22:25 UTC1h 10m
2026-07-20 DAL2700 ATL → STL Jul 20, 18:35 UTCJul 20, 19:50 UTC1h 15m
2026-07-20 DAL2356 - Jul 20, 16:05 UTCJul 20, 16:50 UTC45m
2026-07-20 DAL2356 - Jul 20, 13:45 UTCJul 20, 14:30 UTC45m
2026-07-20 DAL690 BOS → MSP Jul 20, 07:55 UTCJul 20, 12:15 UTC4h 20m
2026-07-20 DAL545 LAX → SFO Jul 20, 02:10 UTCJul 20, 06:15 UTC4h 5m
2026-07-19 DAL1008 - Jul 19, 23:10 UTCJul 20, 00:10 UTC1h 0m
2026-07-19 DAL1008 ATL → CVG Jul 19, 20:35 UTCJul 19, 21:50 UTC1h 15m
2026-07-19 DAL569 ATL → LGA Jul 19, 13:00 UTCJul 19, 17:10 UTC4h 10m
2026-07-19 DAL903 LGA → IAH Jul 19, 03:25 UTCJul 19, 07:50 UTC4h 25m
2026-07-18 DAL1758 PTY → ATL Jul 18, 19:38 UTCJul 18, 23:52 UTC4h 14m
2026-07-18 DAL1758 PTY → ATL Jul 18, 14:20 UTCJul 18, 23:50 UTC9h 30m
2026-07-18 DAL1192 - Jul 18, 11:15 UTCJul 18, 12:15 UTC1h 0m
2026-07-18 DAL489 SEA → BOS Jul 18, 00:00 UTCJul 18, 04:20 UTC4h 21m
2026-07-17 DAL629 ATL → SEA Jul 17, 16:49 UTCJul 17, 21:20 UTC4h 30m
2026-07-17 DAL1523 - Jul 17, 14:10 UTCJul 17, 15:10 UTC1h 0m
2026-07-17 DAL1523 - Jul 17, 11:50 UTCJul 17, 12:45 UTC55m
2026-07-17 DAL3055 - Jul 17, 09:20 UTCJul 17, 10:00 UTC40m
2026-07-17 DAL2850 - Jul 17, 04:29 UTCJul 17, 05:10 UTC40m
2026-07-17 DAL2850 ATL → CHS Jul 17, 04:29 UTCJul 17, 05:13 UTC44m
2026-07-17 DAL3025 - Jul 17, 00:35 UTCJul 17, 01:45 UTC1h 10m
2026-07-17 DAL3025 LIT → ATL Jul 17, 00:31 UTCJul 17, 01:41 UTC1h 10m
2026-07-16 DAL3025 - Jul 16, 22:25 UTCJul 16, 23:20 UTC55m

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 N882DN page for operator, model, and routing details .

Mode-S AC259B frequently asked

What is Mode-S code AC259B?
AC259B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N882DN.
Where is Mode-S AC259B registered?
Mode-S code AC259B 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 AC259B broadcasting right now?
Yes. Mode-S AC259B is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC259B, octal 53022633, decimal 11,281,819.
What flights does AC259B operate?
Mode-S AC259B has broadcast 20 distinct callsigns, including DAL809, DAL368, DAL2925, DAL2396, DAL1938.